Spatiotemporal Pattern Formation in the Oscillatory Electro-Oxidation of Sulfide on a Platinum Disk

Autor(es)

Zhao, Yuemin ^[1] ; Wang, Shasha ^[1] ; Varela, Hamilton ^{[2, 3]} ; Gao, Qingyu ^{[1, 4, 5]} ; Hu, Xuefeng ^[1] ; Yang, Jiaping ^[1] ; Epstein, Irving R. ^{[4, 5]}

Afiliação do(s) autor(es)

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

^[2] GIST, Ertl Ctr Electrochem & Catalysis, Kwangju 500712 - South Korea

^[3] Univ Sao Paulo, Inst Quim Sao Carlos, Dept Fisicoquim, BR-13566590 Sao Carlos, SP - Brazil

^[4] Brandeis Univ, Dept Chem, Waltham, MA 02454 - USA

^[5] Brandeis Univ, Volen Ctr Complex Syst, Waltham, MA 02454 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 115, n. 26, p. 12965-12971, JUL 7 2011.
• Citações Web of Science: 11

Resumo

Spatiotemporal pattern formation in the electrocatalytic oxidation of sulfide on a platinum disk is investigated using electrochemical methods and a charge-coupled device (CCD) camera simultaneously. The system is characterized by different oscillatory regions spread over a wide potential range. An additional series resistor and a large electrode area facilitate observation of multiple regions of kinetic instabilities along the current/potential curve. Spatiotemporal patterns on the working electrode, such as fronts, pulses, spirals, twinkling eyes, labyrinthine stripes, and alternating synchronized deposition and dissolution, are observed at different operating conditions of series resistance and sweep rate. (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