The formate electrooxidation on Pt/C and PtSnO2/C nanoparticles in alkaline media: The effect of morphology and SnO2 on the platinum catalytic activity

Autor(es)

Santos, Aila O. ^[1] ; Silva, Julio Cesar M. ^[1] ; Antoniassi, Rodolfo M. ^{[2, 3]} ; Ponzio, Eduardo A. ^[1] ; Alves, Odivaldo C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Fluminense, Inst Quim, Lab Mat UFF LaMUFF, Campus Valonguinho, BR-24020141 Niteroi, RJ - Brazil

^[2] Univ Fed Fluminense, Inst Qumica, Laboratorio Mat, UFF LaMUFF, BR-24020141 Niteroi, RJ - Brazil

^[3] Univ Sao Paulo, Cidade Univ, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 45, n. 58, p. 33895-33905, NOV 27 2020.
• Citações Web of Science: 3

Resumo

Pt/C and PtSnO2/C electrocatalysts with and without cubic preferential morphology were used for formate electrooxidation reaction (FER) in alkaline medium. The synthesis of catalysts was carried out by alcohol reduction method using KBr as a shape directing agent (Bromide Anion Exchange method BAE). The X-ray diffraction (XRD) showed characteristic peaks of the Pt face-centered cubic (FCC) structure, as well as cassiterite SnO2. The Transmission Electron Microscopy (TEM) and Scanning Transmission Electron Microscopy (STEM) micrographs show SnO2 dispersed onto carbon support and adjacent to the Pt nanoparticles (NPs), as well as cubic Pt NPs. The cyclic voltammetry (CV) measurements show that the current density peak for FER on Pt/C (100) is 2.40 times higher than on Pt/C polycrystalline (poly). The current density at end of chronoamperometry (CA) analysis on PtSnO2/C poly was 1.33 and 5.29 times higher than on Pt/C (100) and Pt/C poly, respectively. The presence of SnO2 and the (100) facets of platinum cubic morphology might prevent platinum surface deactivation caused by intermediates formed during the FER process. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 17/15469-5 - Preparação de nanocatalisadores com morfologia controlada para aplições em purificação de hidrogênio e oxidação de hidrogênio contaminado para geração de energia elétrica
• Beneficiário: Rodolfo Molina Antoniassi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático