Tuning of catalytic properties for electrooxidation of small organic molecules on Pt-based thin films via controlled thermal treatment

Autor(es)

Tripkovic, D. V. ^[1] ; Popovic, K. Dj. ^[1] ; Jovanovic, V. M. ^[1] ; Nogueira, J. A. ^[2] ; Varela, H. ^[2] ; Lopes, P. P. ^[3] ; Strmcnik, D. ^[3] ; Stamenkovic, V. R. ^[3] ; Markovic, N. M. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Belgrade, Dept Electrochem, ICTM, Belgrade 11000 - Serbia

^[2] Univ Sao Paulo, Inst Quim Sao Carlos, Ave Trabalhador SanCarlense 400, BR-13566590 Sao Carlos, SP - Brazil

^[3] Argonne Natl Lab, Dept Mat Sci, 9700 S Cass Ave, Lemont, IL 60439 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CATALYSIS; v. 371, p. 96-105, MAR 2019.
• Citações Web of Science: 0

Resumo

Ability to utilize structure-function relationship in the design of electrocatalysts relies on fundamental understanding of physicochemical processes at the topmost surface. It has been demonstrated that reaction rate for majority of electrochemical reactions exhibit notable dependence on geometric arrangement of surface atoms due to varying levels of binding strength between different atomic structures and adsorbate molecules. Control of surface structure at nanoscale is being investigated here through a thin film approach. The surface characteristics of electrochemically deposited Pt thin films were probed for electrooxidation of small organic molecules such as formic acid and methanol. The low-index Pt single crystal electrodes were used for reactivity benchmarking which later guided thermal annealing processes, and ultimately, fine tuning of the ratio between (1 1 1) and (1 0 0) surface facets on Pt thin films. The tailored thin film structure is responsible for significant activation of both formic acid and methanol oxidation reactions, which justifies the approach. (C) 2019 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 15/09295-9 - Comportamento dinâmico em células a combustível de baixa temperatura baseadas na oxidação de moléculas orgânicas pequenas
• Beneficiário: Jéssica Alves Nogueira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/17644-9 - Estabilidade de eletrocatalisadores frente à eletro-oxidação de moléculas orgânicas
• Beneficiário: Jéssica Alves Nogueira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado