157. S. Xiao, X. Cao, J. Han, C. Ji, H. Varela, V. Del Colle, J. Zhang, C. Pan, Q. Gao, Effect of Electrolyte Ions on Crystalline/Amorphous α-PtO2 Formation in the Electrocatalytic Oxidation of Pt(100) Preferentially Oriented Nanoparticles, ACS Cat. (2023) in press.
156. G. Ragassi, A. Dourado, H. Varela, The oscillatory electro-oxidation of 2-propanol on platinum: the effect of temperature and of the addition of methanol, PhysChemChemPhys (2023) in press.
155. E. A. Paredes-Salazar, E. Herrero, H. Varela, Mass Transfer Phenomena Induced by Surface Gas Flow Rate in the Hanging Meniscus Configuration: A Case Study of the Methanol Electro-oxidation Reaction on Pt(100), Electrochim. Acta 464 (2023) 142917. (doi.org/10.1016/j.electacta.2023.142917)
154. E. A. Paredes-Salazar, A. Calderón-Cárdenas, H. Varela, Microkinetic Modeling of the Methanol Electro-oxidation Reaction on Platinum, ACS Cat. 13 (2023) 9366. (doi.org/10.1021/acscatal.3c00838)
153. P. B. Perroni, T. V. B. Ferraz, J. Rousseau, C. Canaff, H. Varela, T. W. Napporn, Stainless steel supported NiCo2O4 active layer for oxygen evolution reaction, Electrochim. Acta 453 (2023) 142295. (doi.org/10.1016/j.electacta.2023.142295)
152. M. Khalid, H. A. B. Fonseca, L. G. Verga, M. R. Hatshan, J. L. F. da Silva, H. Varela, S. Shahgaldi, Facile synthesis of Ru nanoclusters embedded in carbonaceous shells for hydrogen evolution reaction in alkaline and acidic media, J. Electroanal. Chem. 929 (2023) 117116. (doi.org/10.1016/j.jelechem.2022.117116)
151. V. Del Colle, G. Melle, B. A. F. Previdello, J. M. Feliu, H. Varela, G. Tremiliosi-Filho, The effect of Pt surface orientation on the oscillatory electro-oxidation of glycerol, J. Electroanal. Chem. 926 (2022) 116934. (doi.org/10.1016/j.jelechem.2022.116934)
150. A. M. B. Honorato, M. Khalid, A. A. S. Curvelo, H. Varela, S. Shahgaldi, Trimetallic Nanoalloy of NiFeCo Embedded in Phosphidated Nitrogen Doped Carbon Catalyst for Efficient Electro-Oxidation of Kraft Lignin, Polymers 14 (2022) 3781. (doi.org/10.3390/polym14183781)
149. R. L. Romano, L. P. Damaceno, D. V. Magalhães, P. Parmananda, H. Varela, Electrical coupling of individual electrocatalytic oscillators, Chaos 32 (2022) 083139. (doi.org/10.1063/5.0098339)
148. T. Altair, D. Galante, H. Varela, Voltammetric investigation on iron-(nickel-)sulfur surface under conditions for the emergence of life, IOP SciNotes 3 (2022) 024201. (doi.org/10.1088/2633-1357/ac79e7)
147. E. A. Paredes-Salazar, A. Calderón-Cárdenas, H. Varela, Sensitivity Analysis in the Microkinetic Description of Electrocatalytic Reactions, J. Phys. Chem. A 126 (2022) 2746−2749. (doi.org/10.1021/acs.jpca.2c00624)
146. P. B. Perroni, V. Del Colle, G. Tremiliosi‐Filho, H. Varela, Electro‐oxidation of methanol and glucose on preferentially oriented platinum surfaces: the role of oscillatory kinetics, React. Kinet. Mech. Catal. 135 (2022) 1335–1348. (doi.org/10.1007/s11144-022-02204-y). Invited paper.
145. A. Calderón-Cárdenas, E. A. Paredes-Salazar, H. Varela, A microkinetic description of electrocatalytic reactions: the role of self-organized phenomena, New J. Chem. 46 (2022) 6837–6846. (doi.org/10.1039/d2nj00758d). Feature paper.
144. M. G. de Oliveira, G. B. Melle, R. L. Romano, H. Varela, The Impact of Water Concentration on the Electro-Oxidation of Formic Acid on Platinum, J. Electrochem. Soc. 169 (2022) 026514. (doi.org/10.1149/1945-7111/ac5060)
143. A. H. B, Dourado, V. Del Colle, R. L. Munhos, J. M. Feliu, H. Varela, S. I.Cóórdoba de Torresi, SO2 electrooxidation reaction on Pt single crystal surfaces in acidic media: Electrochemical and in situ FTIR studies, Electrochim. Acta 403 (2022) 139601. (doi.org/10.1016/j.electacta.2021.139601)
142. G. C. A. Ferreira, M. Khalid, T. W. Napporn, R. M. Torresi, H. Varela, Surface and Volumetric Phenomena on Polyaniline-Supported Electrocatalysts, J. Phys. Chem. C 125 (2021) 26073-26083. (doi.org/10.1021/acs.jpcc.1c09260)
141. T. Altair, L. G. F. Borges, D. Galante, H. Varela, Experimental Approaches for Testing the Hypothesis of the Emergence of Life at Submarine Alkaline Vents, Life 11 (2021) 777. (doi.org/10.3390/life11080777)
140. L. G. Puppin, L. F. da Silva, M. Carmo, H. Varela, O. F. Lopes, Effect of the oxidation state and morphology of SnOx‐based electrocatalysts on the CO2 reduction reaction, J. Mater. Res. 36 (2021) 4240-4248. (doi.org/10.1557/s43578-021-00250-1)
139. M. Khalid, X. Zarate, M. Saavedra-Torres, E. Schott, A. M. B. Honorato, M. R. Hatshan, H. Varela, Electro-reduced graphene oxide nanosheets coupled with RuAu bimetallic nanoparticles for efficient hydrogen evolution electrocatalysis, Chem. Eng. J. 421 (2021) 129987. (doi.org/10.1016/j.cej.2021.129987)
138. G. Melle, T. Altair, R. Romano, H. Varela, Electrocatalytic Efficiency of the Oxidation of Ethylene Glycol, Glycerol, and Glucose under Oscillatory Regime, Energy Fuels 35 (2021) 6202-6209. (doi.org/10.1021/acs.energyfuels.1c00203)
137. A. Calderón-Cárdenas, F. W. Hartl, J. A. C. Gallas, H. Varela, Modeling the triple-path electro-oxidation of formic acid on platinum: cyclic voltammetry and oscillations, Catal. Today 359 (2021) 90-98. (doi.org/10.1016/j.cattod.2019.04.054).
136. J. A. Nogueira, P. P. Lopes, N. M. Markovic, H. Varela, Active electrochemical interfaces stabilized through self-organized potential oscillations, Electrochem. Commun. 121 (2020) 106853. (doi.org/10.1016/j.elecom.2020.106853)
135. A. Calderón-Cárdenas, E. A. Paredes-Salazar, C. Mujica-Martinez, R. Nagao, H. Varela, H. Thorough Analysis of the Effect of Temperature on the Electro-oxidation of Formic Acid, J. Phys. Chem. C 124 (2020) 24259-24270. (doi.org/10.1021/acs.jpcc.0c08059)
134. J. A. Nogueira, H. Varela, Direct Liquid Fuel Cells—The Influence of Temperature and Dynamic Instabilities, Energy Fuels 34 (2020) 12995-13009. (doi.org/10.1021/acs.energyfuels.0c02491)
133. C. S. Rodrigues, C. G. P. Santos, R. C. C. Miranda, E. Parma, H. Varela, R. Nagao, A numerical investigation of the effect of external resistance and applied potential on the distribution of periodicity and chaos in the anodic dissolution of nickel, Phys. Chem. Chem. Phys. 22 (2020) 21823-21834. (doi.org/10.1039/d0cp04238b)
132. M. Khalid, P. A. Bhardwaj, A. M. B. Honorato, H. Varela, Metallic single-atoms confined in carbon nanomaterials for the electrocatalysis of oxygen reduction, oxygen evolution, and hydrogen evolution reactions, Catal. Sci. Technol. 10 (2020) 6420-6448. (doi.org/10.1039/D0CY01408G)
131. A. Calderoń-Cárdenas, E. A. Paredes-Salazar, H. Varela, Apparent Activation Energy in Electrochemical Multistep Reactions: A Description via Sensitivities and Degrees of Rate Control, ACS Catal. 10 (2020) 9336-9345. (doi.org/10.1021/acscatal.0c02359)
130. V. Del Colle, H. Varela, G. Tremiliosi-Filho, Electrocatalytic oxidation of small organic molecules on well-defined Pt single-crystal surfaces with controlled density of electrochemically generated defects, Curr. Opin. Electrochem. 23 (2020) 123-130. (doi.org/10.1016/j.coelec.2020.06.010)
129. M. Khalid, A. M. B. Honorato, A. A. Pasa, H. Varela, A sugar derived carbon-red phosphorus composite for oxygen evolution reaction and supercapacitor activities, Materials Science for Energy Technologies 3 (2020) 508-514. (doi.org/10.1016/j.mset.2020.05.002)
128. V. Del Colle, P. B. Perroni, J. M. Feliu, G. Tremiliosi-Filho, H. Varela, The role of surface sites on the oscillatory oxidation of methanol on Stepped Pt[n(111) x (110)] electrodes, J. Phys. Chem. C 124 (2020) 10993-11004. (doi.org/10.1021/acs.jpcc.0c01897).
127. N. Perini, M. V. L. Delmode, C. Ranjan, H. Varela, Mechanistic aspects of the comparative oscillatory electrochemical oxidation of formic acid and methanol on platinum electrode, J. Solid State Electrochem. 24 (2020) 1811-1818. (doi.org/10.1007/s10008-020-04609-y)
126. M. Khalid, A. M. B. Honorato, G. Tremiliosi-Filho, H. Varela, Trifunctional catalytic activities of trimetallic FeCoNi alloy nanoparticles embedded in carbon shell and for efficient overall water splitting, J. Mater. Chem. A 8 (2020) 9021-903. (doi.org/10.1039/C9TA13637A)
125. M. Khalid, R. Paul, A. M. B. Honorato, H. Varela, Pinus nigra pine derived hierarchical carbon foam for high performance supercapacitor applications, J. Electroanal. Chem. 863 (2020) 114053. (doi.org/10.1016/j.jelechem.2020.114053).
124. R. L. Romano, M. G. Oliveira, H. Varela, The impact of water concentration on the electro-oxidation of methanol on platinum, J. Electrochem. Soc. 167 (2020) 046506. (doi.org/10.1149/1945-7111/ab75c7)
123. K. C. F. Araújo, D. R. Silva, E. V. Santos, H. Varela, C. A. Martínez-Huitle, Investigation of persulfate production on BDD anode by understanding the impact of water concentration, J. Electroanal. Chem. 860 (2020) 113927. (doi.org/10.1016/j.jelechem.2020.113927).
122. A. B. Dourado, N. A Silva-Jr, R. L. Munhos, V. Del Colle, M. Arenz, H. Varela, S. C. de Torresi, On the influence of anion chaotropicity on the SO2 oxidation reaction: when spectator species determine the reaction pathway, ChemElectroChem 7 (2020) 1843. (doi.org/10.1002/celc.201902122). Paper featured in the journal front cover.
121. L. G. Puppin, M. Khalid, G. T. T. da Silva, C. Ribeiro, H. Varela, O. F. Lopes, Electrochemical reduction of CO2 to formic acid on Bi2O2CO3/carbon fiber electrodes, J. Mater. Res. 35 (2020) 272. (doi.org/10.1557/jmr.2020.16). Invited paper.
120. J. G. Freire, A. Calderón-Cárdenas, H. Varela, J. A. C. Gallas, Phase diagrams and dynamical evolution of the triple- pathway electro-oxidation of formic acid on platinum, Phys. Chem. Chem. Phys. 22 (2020) 1078. (doi.org/10.1039/C9CP04324A). Selected by the Editors as a 2020 HOT PCCP article.
119. Z. Stempien, M. Khalid, H. Varela, M. Kozicki, M. Kozanecki, P. Filipczak, R. Pawlak, E. Korzeniewska, E. Sąsiadek, In-situ deposition of reduced graphene oxide layers on textile surfaces by the reactive inkjet printing technique and their use in supercapacitor applications, Synth. Met. 256 (2019) 116144. (doi.org/10.1016/j.synthmet.2019.116144).
118. A. Dourado, R. Munhos, N. Silva, V. Dell Colle, G. Carvalho, P. Oliveira, M. Arenz, H. Varela, S. Córdoba De Torresi, Opportunities and knowledge gaps of SO2 catalytic oxidation for H2 electrochemical generation, ACS Catal. 9 (2019) 8136−8143. (doi.org/10.1021/acscatal.9b01336)
117. J. A. Nogueira, K. Krischer, H. Varela, Coupled Dynamics of Anode and Cathode in Proton‐Exchange Membrane Fuel Cells, ChemPhysChem 20 (2019) 3081–3088. (doi.org/10.1002/cphc.201900531).
116. M. Khalid, A. M. B. Honorato, A. Hassan, F. N. Crespilho, H. Varela, 8-Hydroxyquinoline-5-sulfonic acid on reduced graphene oxide layers as a metal-free electrode material for supercapacitor applications, J. Electroanal. Chem. 847 (2019) 113193. (doi.org/10.1016/j.jelechem.2019.113193).
115. F. W. Hartl, H. Varela, A. Cuesta, The oscillatory electro-oxidation of formic acid: insights on the adsorbates involved from time-resolved ATR-SEIRAS and UV reflectance experiments, J. Electroanal. Chem. 840 (2019) 249-254.
114. D. V. Tripkovic, K. Dj. Popovic, V. M. Jovanovic, J. A. Nogueira, H. Varela, P.P. Lopes, D. Strmcnik, V. R. Stamenkovic, N. M. Markovic, Tuning of catalytic properties for electrooxidation of small organic molecules on Pt-based thin films via controlled thermal treatment, J. Catal. 371 (2019) 96–105. (doi.org/10.1016/j.jcat.2019.01.038)
113. M. F. Silva, M. V. F. Delmonde, B. C.Batista, E. Boscheto, H. Varela, G. A.Camara, Oscillatory electro-oxidation of ethanol on platinum studied by in situ ATR-SEIRAS, Electrochim. Acta 293 (2019) 166-173.
112. M. Khalid, A. Hassan, A. M. B. Honorato, F. N. Crespilho, H. Varela, Nano-flocks of bimetallic organic framework for efficient hydrogen evolution electrocatalysis, Chem. Comm. 54 (2018) 11048–11051.
111. G. Melle, F. Hartl, H. Varela, E. Sitta, The effect of solution pH on the oscillatory electro-oxidation of methanol, J. Electroanal. Chem. 826 (2018) 164–169.
110. O. F. Lopes, H. Varela, Effect of Annealing Treatment on Electrocatalytic Properties of Copper Electrodes toward Enhanced CO2 Reduction, ChemistrySelect 3 (2018) 9046–9055. (doi.org/10.1002/slct.201802102). Top download paper 2018-2019.
109. M. Khalid, A. M. B. Honorato, E. A. Ticianelli, H Varela, Uniformly self-decorated Co3O4 nanoparticles on N, S co-doped carbon layers derived from a camphor sulfonic acid and metal–organic framework hybrid as an oxygen evolution electrocatalyst, J. Mater. Chem. A 6 (2018) 12106-12114. (doi.org/10.1039/C8TA02926A). Top 5% of most read articles published in the J. Mat. Chem. A during April-June 2018, and included in the most-read Q2 2018 virtual collection.
108. B. A. F. Previdello, P. Fernandez, G. Tremiliosi-Filho, H. Varela, Probing surface fine structure through electrochemical oscillations, Phys. Chem. Chem. Phys. 20 (2018) 5674-5682.(doi.org/10.1039/C7CP08028J) Selected by the Editors as a 2018 HOT PCCP article.
107. M. Khalid, H. Varela, A general potentiodynamic approach for red phosphorous and sulfur nanodots incorporation on reduced graphene oxide sheets: Metal-free and binder-free electrodes for supercapacitor and hydrogen evolution activities, J. Mater. Chem. A 6 (2018) 3151-3160.
Efficiency of the Oxidation of Small Organic Molecules under Oscillatory Regime, J. Phys. Chem. C 120 (2016) 22365–22374. (doi.org/10.1021/acs.jpcc.6b06692)
94. J. A. Nogueira, I. K. P. Arias, T. Vidakovic-Koch, H. Varela, K. Sundmacher, Autonomous Voltage Oscillations in a Direct Methanol Fuel Cell, Electrochim. Acta 212 (2016) 545–552.
93. B. A. F. Previdello, P. S. Fernández, G. Tremiliosi-Filho, H. Varela, Oscillatory Electro-oxidation of Methanol on Platinum Single Crystal Electrodes, Electrocat. 7 (2016) 276–279.
92. R. Nagao, H. Varela, Padrões de Turing em sistemas químicos, Quim. Nova 39 (2106) 474-485.
91. A. A. Zülke, H. Varela, The effect of temperature on the coupled slow and fast dynamics of an electrochemical oscillator, Sci. Rep. 6 (2016) 24553.
90. E. G. Machado, H. Varela, Complex Dynamics in the Electro-Oxidation of Formic Acid Assisted by Hydrazine in Acidic Media, J. Electrochem. Soc. 163 (2016) H186-H191.(10.1149/2.0671603jes)
89. A. M. Zimer, M. M. Silva, E. G. Machado, H. Varela, L. H. Mascaro, E. C. Pereira, Development of a versatile rotating ring-disc electrode for in situ pH measurements, Anal. Chim. Acta 897 (2015) 17-23.(doi.org/10.1016/j.aca.2015.09.047)
88. M. A. Nascimento, H. Varela, J. A. C. Gallas, Periodicity hubs and spirals in an electrochemical oscillator, J. Solid State Electrochem. 19 (2015) 3287–3296.
87. E. Sitta, R. Nagao, I. Z. Kiss, H. Varela, Impact of the alkali cation on the oscillatory electro-oxidation of ethylene glycol on platinum, J. Phys. Chem. C 119 (2015) 1464-1472.
86. R. Nagao, R. G. Freitas, C. D. Silva, H. Varela, E. C. Pereira, Oscillatory electro-oxidation of methanol on nanoarchitectured Pt pc/Rh/Pt metallic multilayer, ACS Catal. 5 (2015) 1045-1052.
85. H. Varela, R. M. Torresi, Comentário sobre o artigo: “Modificação do polímero condutor polianilina para uso como trocador catiônico”, Quim. Nova 38 (2015) 159.
84. R. Nagao, M. A. Nascimento, H. Varela, Aparato eletroquímico para sistema de aquisição de dados multicanal com resolução espaço-temporal, Quim. Nova 38 (2015) 136-143.
83. M. A. Nascimento, R. Nagao, M. Eiswirth, H. Varela, Coupled slow and fast surface dynamics in an electrocatalytic oscillator: Model and simulations, J. Chem. Phys. 141 (2014) 234701.Paper featured in the journal front cover.
82. M. V. F. Delmonde, M. A. Nascimento, R. Nagao, D. A. Cantane, F. H. B. Lima, H. Varela, On the production of volatile species during the oscillatory electro-oxidation of small organic molecules, J. Phys. Chem. C 118 (2014) 17699-17709. (doi.org/10.1021/jp5044915)
81. P. A. Nogueira, B. C. Batista, R. B. Faria, H. Varela, The effect of temperature on the dynamics of a homogeneous oscillatory system operated in batch and under flow, RSC Adv. 4 (2014) 30412-30421.
80. N. Perini, B. C. Batista, A. C. D. Angelo, I. R. Epstein, H. Varela, Long-lasting oscillations in the electro-oxidation of formic acid on PtSn intermetallic surfaces, Chem. Phys. Chem. 15 (2014) 1753-1760. Paper featured in the journal front cover.
79. W. Bi, Y. He, M. F. Cabral, H. Varela, J. Yang, R. Jiang, Q. Gao, Oscillatory electro-oxidation of thiosulfate on gold, Electrochim. Acta 133 (2014) 308-315.
78. B. A. F. Previdello, E. G. Machado, H. Varela, The effect of the alkali metal cation on the electrocatalytic oxidation of formate on platinum, RSC Adv. 4 (2014) 15271-15275.
77. E. G. Machado, H. Varela, Oscillatory Instabilities in the Electro-oxidation of Borohydride on Platinum, J. Braz. Chem. Soc. 25 (2014) 442-447.
76. E. Sitta, R. Nagao, H. Varela, The Electro-Oxidation of Ethylene Glycol on Platinum over a Wide pH Range: Oscillations and Temperature Effects, Plos One 8 (2013) e75086. (doi.org/10.1371/journal.pone.0075086)
75. R. Nagao, D. A. Cantane, F. H. B. Lima, H. Varela, Influence of Anion Adsorption on the Parallel Reaction Pathways in the Oscillatory Electro-oxidation of Methanol, J. Phys. Chem. C 117 (2013) 15098-15105. (doi.org/10.1021/jp4028047)
74. M. F. Cabral, R. Nagao, E. Sitta, M. Eiswirth, H. Varela, Mechanistic aspects of the linear stabilization of non-stationary electrochemical oscillations, Phys. Chem. Chem. Phys. 15 (2013) 1437-1442.
73. S. Gong, X. Tang, J. Zheng, M. A. Nascimento, H. Varela, Y. Zhao, Q. Gao, Amplitude-modulated spiral waves arising from a secondary Hopf bifurcation in mixed-mode oscillatory media, Chem. Phys. Lett. 567 (2013) 55-59. (doi.org/10.1016/j.cplett.2013.02.042)
72. J. Yang, Y. Song, H. Varela, I. R. Epstein, W. Bi, H. Yu, Y. Zhao, Q. Gao, The effect of chloride on spatiotemporal dynamics in the electro-oxidation of sulfide on platinum, Electrochim. Acta 98 (2013) 116-122.
71. C. A. Angelucci, H. Varela, G. Tremiliosi-Filho, J. F. Gomes, The significance of non-covalent interactions on the electro-oxidation of alcohols on Pt and Au in alkaline media, Electrochem. Commun. 33 (2013) 10-13.
70. P. P. Lopes, B. C. Batista, G. A. Saglietti, H. Varela, E. A. Ticianelli, Real-time determination of CO2 production and estimation of adsorbate coverage on a proton exchange membrane fuel cell under oscillatory operation, J. Solid State Electrochem. 17 (2013) 1851-1859.
69. P. A. Nogueira, R.B. Faria, H. Varela, On the failure of sustained oscillations in the bromate/hypophosphite-acetone/dual catalyst flow system, Chem. Phys. Lett. 557 (2013) 191-193.
68. N. Perini, E. Sitta, A. C. D. Angelo, H. Varela, Electrocatalytic activity under oscillatory regime: The electro-oxidation of formic acid on ordered Pt3Sn intermetallic phase, Catal. Commun. 30 (2013) 23-26.
67. G. C. A. Ferreira, B. C. Batista, H. Varela, Experimental Assessment of the Sensitiveness of an Electrochemical Oscillator towards Chemical Perturbations, Plos One 7 (2012) e50145.
66. A. L. Santos, R. Nagao, C. P. Oliveira, R. B. Lima, H. Varela, Reply to the Comment on the paper ‘The role of HBF4 in electro-catalysis: Arsenic contamination and anion adsorption by A.L. Santos, R. Nagao, C.P. Oliveira, R.B. de Lima, H. Varela [J. Electroanal. Chem. 660 (2011) 147 152]’, J. Electroanal. Chem. 687 (2012) 1-2.
65. C. P. Oliveira, N. Lussari, E. Sitta, H. Varela, Oscillatory electro-oxidation of glycerol on platinum, Electrochim. Acta 85 (2012) 674-679. (doi.org/10.1016/j.electacta.2012.08.087)
64. H. Varela, Spatiotemporal Pattern Formation during Electrochemical Oxidation of Hydrogen on Platinum, ChemistryOpen 1 (2012) 165-168.
63. I. S. Kiss, E. Sitta, H. Varela, On the Limit of Frequency of Electrochemical Oscillators and Its Relationship to Kinetic Parameters, J. Phys. Chem. C 116 (2012) 9561–9567.
62. M. F. Silva, B. C. Batista, E. Boscheto, H. Varela, G. A. Camara, Electro-oxidation of ethanol on Pt and PtRu surfaces investigated by ATR surface-enhanced infrared absorption spectroscopy, J. Braz. Chem. Soc. 23 (2012) 831-837.
61. R. Nagao, D. A. Cantane, F. H. B. Lima, H. Varela, The dual pathway in action: decoupling parallel routes for CO2 production during the oscillatory electro-oxidation of methanol, Phys. Chem. Chem. Phys. 14 (2012) 8294-8298. (doi.org/10.1039/C2CP00037G)
60. P. A. Nogueira, H. Varela, R.B. Faria, The role of Ce(III) in BZ oscillating reactions, Chem. Phys. Lett. 530 (2012) 137-139. (doi.org/10.1016/j.cplett.2012.01.066)
59. H. C. L. Oliveira, T. B. Oliveira, H. Varela, Dinâmica oscilatória em sistemas contendo bromato e 1,4-ciclohexanodiona em meio ácido. I. Efeito da temperatura, Quim. Nova 35 (2012) 348-354.
58. E. G. Machado, E. Sitta, F.H.B. Lima, J. Lee, H. Varela, Open circuit interaction of borohydride with oxidized platinum surfaces, Electrochem. Commun. 16 (2012) 107-109.
57. A. L. Santos, R. Nagao, C. P. Oliveira, R. B. de Lima, H. Varela, The role of HBF4 in electro-catalysis: arsenic contamination and anion adsorption, J. Electroanal. Chem. 660 (2011) 147-152.
56. Y. Zhao, S. Wang, H. Varela, Q. Gao, X. Hu, J. Yang, I. R. Epstein, Spatiotemporal pattern formation in the oscillatory electro-oxidation of sulfide on a platinum disk, J. Phys. Chem. C 115 (2011) 12965-12971.
55. H. Varela, E. Sitta, E. G. Machado, Comment on: ‘Electrochemical Quartz Crystal Microbalance Study of Borohydride Electro-Oxidation on Pt: The Effect of Borohydride Concentration and Thiourea Adsorption’, J. Phys. Chem. C 115 (2011) 10310-10311.
54. M. A. Nascimento, J. A. C. Gallas, H. Varela, Self-organized distribution of periodicity and chaos in an electrochemical oscillator, Phys. Chem. Chem. Phys. 13 (2011) 441-446. (doi.org/10.1039/C0CP01038C) Paper featured in the journal front cover.
53. H. Varela, Da parte para o todo: auto-organização dinâmica em sistemas Físico-Químicos, Cienc. Cult. 63 (2011) 23-25.
52. E. Sitta, B. C. Batista, H. Varela, The impact of the alkali cation on the mechanism of the electro-oxidation of ethylene glycol on Pt, Chem. Commun. 47 (2011) 3775-3777.
51. B. C. Batista, G. C. A. Ferreira, H. Varela, The effect of poisoning species on the oscillatory dynamics of an electrochemical reaction, J. Phys.: Conf. Ser. 285 (2011) 012003 (012003-1: 012003-8).
50. P. P. Lopes, E.A. Ticianelli, H. Varela, Potential oscillations in a proton exchange membrane fuel cell with a Pd-Pt/C anode, J. Power Sources 196 (2011) 84-89.
49. R. Nagao, E. Sitta, H. Varela, Stabilizing Nonstationary Electrochemical Time Series, J. Phys. Chem. C 144 (2010) 22262-22268.
48. A. P. M. Camargo, B. A. F. Previdello, H. Varela, E. R. Gonzalez, The effect of temperature on the electro-oxidation of ethanol on platinum, Quim. Nova 33 (2010) 2143-2147.
47. E. Sitta, M.A. Nascimento, H. Varela, Complex kinetics, high frequency oscillations and temperature compensation in the electro-oxidation of ethylene glycol on platinum, Phys. Chem. Chem. Phys. 12 (2010) 15195-1206.
46 B. C. Batista, H. Varela, Open Circuit Interaction of Formic Acid with Oxidized Pt Surfaces: Experiments, Modeling, and Simulations, J. Phys. Chem. C 114 (2010), 18494-18500.
Paper featured in the journal front cover.
45. A. Mota, P.P. Lopes, E.A. Ticianelli, E. R. Gonzalez, H. Varela, Complex oscillatory response of a PEM Fuel Cell fed with H2/CO and oxygen, J. Electrochem. Soc. 157 (2010) B1301-B1304. (doi.org/10.1149/1.3463725)
44. E. Sitta, H. Varela, Beta Oscillations in the Electro-oxidation of Ethylene Glycol on Platinum, Electrocatalysis 1 (2010) 19-21.
43. E. Boscheto, B.C. Batista, R.B. Lima, H. Varela, A surface-enhanced infrared absorption spectroscopic (SEIRAS) study of the oscillatory electro-oxidation of methanol on platinum, J. Electroanal. Chem. 642 (2010) 17-21.
42. A. P. M. Camargo, B.A.F. Previdello, H. Varela, E.R. Gonzalez, The impact of water concentration on the catalytic oxidation of ethanol on platinum electrode in concentrated phosphoric acid, Electrochem. Commun. 12 (2010) 140-143.
41. S. Sauerbrei, M. A. Nascimento, M. Eiswirth, H. Varela, Mechanism and model of the oscillatory electro-oxidation of methanol, J. Chem. Phys. 132 (2010) 154901 (154901-1: 154901-10).
40. C. A. Angelucci, H. Varela, E. Herrero, J. M. Feliu, Activation energies of the electro-oxidation of formic acid on Pt(100), J. Phys. Chem. C 113 (2009) 18835-18841.
39. E. Sitta, A.L. Santos, R. Nagao, H. Varela, Nanogravimetric study of the complex voltammetric response in the electro-oxidation of methanol on platinum, Electrochim. Acta 55 (2009) 404-409.
38. G. Jerkiewicz, M. Alsabet, M. Grden, H. Varela, G. Tremiliosi-Filho, Erratum to: ‘Comprehensive study of the growth of thin oxide layers on Pt electrodes under well-defined temperature, potential, and time conditions [Journal of Electroanalytical Chemistry, 589 (2006) 120 127]’, J. Electroanal. Chem. 625 (2009) 172-174.
37. E. A. Carbonio, R. Nagao, E. R. Gonzalez, H. Varela, Temperature effects on the oscillatory electro-oxidation of methanol on platinum”, Phys. Chem. Chem. Phys. 11 (2009) 665-670.
36. B. C. Batista, E. Sitta, M. Eiswirth, H. Varela, Autocatalysis in the open circuit interaction of alcohol molecules with oxidized Pt surfaces, Phys. Chem. Chem. Phys. 10 (2008) 6686-6692.
35. P. A. Nogueira, H. C. L. Oliveira, H. Varela, Time Evolution of the Activation Energy in a Batch Chemical Oscillator”, J. Phys. Chem. A 112 (2008) 12412-12415.
34. E. Joanni, E. R. Gonzalez, H. Varela, Co-eletrodeposição oscilatória de cobre e estanho, Quim. Nova 31 (2008) 1444-1449.
33. A. L. Martins, B. C. Batista, E. Sitta, H. Varela, Oscillatory instabilities during the electrocatalytic oxidation of methanol on platinum, J. Braz. Chem. Soc. 19 (2008) 679-687.
32. R. Nagao, I. R. Epstein, E. R. Gonzalez, H. Varela, Temperature (over)compensation in an oscillatory surface reaction, J. Phys. Chem. A 112 (2008) 4617-4624.
31. A. L. Santos, L. J. Deiner, H. Varela, The effect of ultra-low proton concentration on the electrocatalytic reduction of nitrate over platinum, Catal. Commun. 9 (2008) 269-272.
30. R. B. Lima, H. Varela, Catalytic oxidation of ethanol on gold electrode in alkaline media, Gold Bull. 41 (2008) 15-22. (doi.org/10.1007/BF03215619)
29. E. Sitta, H. Varela, On the open-circuit interaction between methanol and oxidized platinum electrodes, J. Solid State Electrochem. 12 (2008) 559-567.
28. F. V. Andrade, L. J. Deiner, H. Varela, J. F. R. Castro, I. A. Rodrigues, F. C. Nart, Electrocatalytic reduction of nitrate over palladium nanoparticle catalysts: A temperature dependent study, J. Electrochem. Soc. 154 (2007) F159-F164.
27. G. Tokoro, H. C. L. Oliveira, H. Varela, Dinâmica complexa no sistema bromato, hipofosfito,acetona,manganês e ferroína, Quim. Nova 30 (2007) 1930-1937. (doi.org/10.1590/S0100-40422007000800026) Paper featured in the journal front cover.
26. F. Colmati, S. Yoshioka, V. L. V. B. Silva, H. Varela, E. R. Gonzalez, Enzymatic Based Biocathode in a Polymer Electrolyte Membrane Fuel Cell, Int. J. Electrochem. Sc. 2 (2007) 195-202.
25. M. Ferreira, H. Varela, R.M. Torresi, G. Tremiliosi-Filho, Electrode passivation caused by polymerization of different phenolic compounds, Electrochim. Acta 52 (2006) 434-442. (doi.org/10.1016/j.electacta.2006.05.025)
24. F. Plenge, H. Varela, K. Krischer, Pattern formation in stiff oscillatory media with nonlocal coupling: A numerical study of the hydrogen oxidation reaction on Pt electrodes in the presence of poisons, Phys. Rev. E 72 (2005) 066211 (066211-1: 066211-11).
23. H. Varela, C. Beta, A. Bonnefont, K. Krischer, A hierarchy of global coupling induced cluster patterns during the oscillatory H2 electrooxidation reaction on a Pt ring electrode, Phys. Chem. Chem. Phys. 7 (2005) 2429-2434.(doi.org/10.1039/B502027A) Paper featured in the journal front cover.
22. F. Plenge, H. Varela, K. Krischer, Asymmetric target patterns in one-dimensional reaction-diffusion-type systems with genuine nonlocal coupling, Phys. Rev. Lett 94 (2005) Art. No. 198301 (198301-1:198301-4).
21. H. Varela, C. Beta, A. Bonnefont, K. Krischer, Transitions to electrochemical turbulence, Phys. Rev. Lett.94 (2005) 174104 (174104-1: 174104-4).
20. A. Bonnefont, H. Varela, K. Krischer, Stationary spatial patterns during bulk CO electrooxidation on platinum, J. Phys. Chem. B 109 (2005) 3408 – 3415.
19. H. Varela, A. Bonnefont, K. Krischer, Trapping Electrochemical Oscillations Between Self-Organized Potential Walls, ChemPhysChem 4 (2003) 1348-1351.
18. K. Krischer, H. Varela, A. Birzu, F. Plenge, A. Bonnefont, Stability of Uniform Electrode States in the Presence of Ohmic Drop Compensation, Electrochim. Acta 49 (2003) 103-115.
17. A. Bonnefont, H. Varela, K. Krischer, Stationary Small and Large Amplitude Patterns during Bulk CO Electrooxidation on Pt, ChemPhysChem 4 (2003) 1260-1263.
16. H. Varela, R. L. Bruno, R. M. Torresi, Ionic Transport in Conducting Polymers/Nickel Tetrasulfonated Phthalocyanine Modified Electrodes, Polymer 44 (2003) 5369–5379.
15. F. Plenge, H. Varela, M. Lübe, K. Krischer, Quantitative Modeling of the Oscillatory Electrooxidation of Hydrogen on Pt in the Presence of Poisons, Z. Phys. Chem. 217 (2003) 365-381.
14. H. Varela, K. Krischer, Deciphering the Origin of High-Order Periodic and Aperiodic Cyclic Voltammetric Responses during Oxidation Processes on Platinum, J. Phys. Chem. B 106 (2002) 12258-12266.
13. H. Varela, F. Huguenin, M. Malta, R. M. Torresi, Materiais para cátodos de baterias secundárias de lítio, Quim. Nova 25 (2002) 287-299.
12. H. Varela, R. M. Torresi, E. R. Gonzalez, Aspectos relacionados à Utilização da Equação Logística Quadrática em Processos Eletroquímicos, Quim. Nova 25 (2002) 99-106.
11. P. Grauel, H. Varela, K. Krischer, Spatial Bifurcations of Fixed Points and Limit Cycles during the Electrochemical Oxidation of H2 on Pt Ring Electrodes, Faraday Discuss. 120 (2001) 165-178.
10. H. Varela, K. Krischer, “Nonlinear Phenomena during Electrochemical Oxidation of Hydrogen on Platinum Electrodes”, Catal.Today 70 (2001) 411-425.
9. H. Varela, S. L. A. Maranhão, R. M. Q. Mello, E. A. Ticianelli, R. M. Torresi, Comparisons of Charge Compensation Process in Aqueous Media of Polyaniline and Self-Doped Polyanilines, Synth. Met. 122 (2001) 321-327.
8. L. O. Peres, H. Varela, J. R. Garcia, M. R. Fernandes, R. M. Torresi, F. C. Nart, J. Gruber, On the Electrochemical Polymerization of Poly(p-phenylene vinylene) and Poly(o-phenylene vinylene), Synth. Met. 118 (2001) 65-70.
7. H. Varela, M. Malta, R. M. Torresi, Microgravimetric Study of the Influence of the Solvent on the Redox Properties of Polypyrrol Modified Electrodes, J. Power Sources 92 (2001) 50-55.
6. H. Varela, G. A. Câmara, H. Scatena Jr., E. R. Gonzalez, Reação de Geração de Oxigênio em Eletrodos de Mn2O3 Suportados em Aço Inoxidável, Quim. Nova 23 (2000) 721-726.
5. H. Varela, R. M. Torresi, D. A. Buttry, Mixed Cation and Anion Transport during Redox Cycling of a Self-Doped Polyaniline Derivative in Non-Aqueous Media, J. Electrochem. Soc. 147 (2000) 4217-4223. (doi.org/10.1149/1.1394044)
4. H. Varela, M. Malta, R. M. Torresi, Técnicas in situ de Baixo Custo em Eletroquímica: A Microbalança a Cristal de Quartzo, Quim. Nova 23 (2000) 664-679. (doi.org/10.1590/S0100-40422000000500016)
3. J. Lee, H. Varela, S. Uhm, Y. Tak, Electrodeposition of PbO2 onto Au and Ti Substrates, Electrochem. Commun. 2 (2000) 646-652. (doi.org/10.1016/S1388-2481(00)00095-3)
2. H. Varela, R. M. Torresi, D. A. Buttry, Study of Charge Compensation during the Redox Process of Self-Doped Polyaniline in Aqueous Media, J. Braz. Chem. Soc. 11 (2000) 32-38. (doi.org/10.1590/S0103-50532000000100007)
1. H. Varela, R. M. Torresi, Ionic Exchange Phenomena Related with the Redox Process of Polyaniline in Nonaqueous Media, J. Electrochem. Soc. 147 (2000) 665-670. (doi.org/10.1149/1.1393250).