The effect of chloride on spatiotemporal dynamics in the electro-oxidation of sulfide on platinum

Autor(es)

Yang, Jiaping ^[1] ; Song, Yanan ^[1] ; Varela, Hamilton ^{[2, 3]} ; Epstein, Irving R. ^{[4, 5]} ; Bi, Wenyan ^[1] ; Yu, Huiyao ^[1] ; Zhao, Yuemin ^[1] ; Gao, Qingyu ^[1]

Afiliação do(s) autor(es)

^[1] China Univ Min & Technol, Coll Chem Engn, Xuzhou 221008 - Peoples R China

^[2] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[3] Ertl Ctr Electrochem & Catalysis, Kwangju 500712 - South Korea

^[4] Brandeis Univ, Dept Chem, Waltham, MA 02545 - USA

^[5] Brandeis Univ, Volen Ctr Complex Syst, Waltham, MA 02545 - USA

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 98, p. 116-122, MAY 30 2013.
• Citações Web of Science: 14

Resumo

The adsorption of poisonous species on the catalyst surface impacts electrocataiytic reactions to different extents and by distinct means. The impact of adsorbing anionic species on electrocatalytic reactions has generally been investigated in the non-oscillatory regime or, at most, with temporal oscillations. Here, we report on spatiotemporal pattern formation in the electro-oxidation of sulfide on a platinum disk perturbed with dissolved chloride. The spatiotemporal dynamics was followed simultaneously with an electrochemical workstation and a charge-coupled device (CCD) camera. Perturbing the system with chloride results in (a) enhancement of dynamic instabilities throughout the current-potential curve, including regions of both positive and negative slope; (b) emergence of several spatial patterns; and (c) decreasing the width of pulses with increasing {[}Cl-]. The results are interpreted in terms of surface poisoning by chloride adsorption. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 09/07629-6 - Eletrocatálise IV: aspectos fundamentais e aplicados dos processos eletrocatalíticos, bio-eletrocatálise e instabilidades cinéticas
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático