Dissolution of Pt during Oxygen Reduction Reaction Produces Pt Nanoparticles

Autor(es)

Bae, Je Hyun ^[1] ; Brocenschi, Ricardo F. ^[1] ; Kisslinger, Kim ^[2] ; Xin, Huolin L. ^[2] ; Mirkin, Michael V. ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] CUNY Queens Coll, Dept Chem & Biochem, Flushing, NY 11367 - USA

^[2] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 - USA

^[3] CUNY, Grad Ctr, New York, NY 10016 - USA

• Tipo de documento: Artigo Científico
• Fonte: Analytical Chemistry; v. 89, n. 23, p. 12618-12621, DEC 5 2017.
• Citações Web of Science: 7

Resumo

The loss of Pt during the oxygen reduction reaction (ORR) affects the performance and economic viability of fuel cells and sensors. Our group previously observed the dissolution of Pt nanoelectrodes at moderately negative potentials during the ORR. Here we report a more detailed study of this process and identify its product. The nanoporous Pt surface formed during the ORR was visualized by AFM and high-resolution SEM, which also showed nm sized Pt particles on the glass surface surrounding the electrode. The release of these nanoparticles into the solution was confirmed by monitoring their catalytically amplified collisions with a Hg-coated microelectrode used as the tip in the scanning electrochemical microscope (SECM). (AU)

• Processo FAPESP: 16/03347-0 - Uso da microscopia eletroquímica de varredura para investigar o efeito de pré-tratamentos eletroquímicos na atividade de eletrodos de diamante dopado com boro para diferentes espécies redox
• Beneficiário: Ricardo Francisco Brocenschi
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado