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Systematic Investigation of Iridium-Based Bimetallic Thin Film Catalysts for the Oxygen Evolution Reaction in Acidic Media.
Strickler, Alaina L; Flores, Raul A; King, Laurie A; Nørskov, Jens K; Bajdich, Michal; Jaramillo, Thomas F.
Afiliação
  • Strickler AL; Department of Chemical Engineering , Stanford University , Stanford , California 94305 , United States.
  • Flores RA; Department of Chemical Engineering , Stanford University , Stanford , California 94305 , United States.
  • King LA; Department of Chemical Engineering , Stanford University , Stanford , California 94305 , United States.
  • Nørskov JK; Department of Chemical Engineering , Stanford University , Stanford , California 94305 , United States.
  • Bajdich M; SUNCAT Center for Interface Science and Catalysis , SLAC National Accelerator Laboratory , Menlo Park , California 94025 , United States.
  • Jaramillo TF; Department of Physics , Technical University of Denmark , 2800 Kongens Lyngby , Denmark.
ACS Appl Mater Interfaces ; 11(37): 34059-34066, 2019 Sep 18.
Artigo em Inglês | MEDLINE | ID: mdl-31442022
ABSTRACT
Multimetallic Ir-based systems offer significant opportunities for enhanced oxygen evolution electrocatalysis by modifying the electronic and geometric properties of the active catalyst. Herein, a systematic investigation of bimetallic Ir-based thin films was performed to identify activity and stability trends across material systems for the oxygen evolution reaction (OER) in acidic media. Electron beam evaporation was used to co-deposit metallic films of Ir, IrSn2, IrCr, IrTi, and IrNi. The electrocatalytic activity of the electrochemically oxidized alloys was found to increase in the following order IrTi < IrSn2 < Ir ∼ IrNi < IrCr. The IrCr system demonstrates two times the catalytic activity of Ir at 1.65 V versus RHE. Density functional theory calculations suggest that this enhancement is due to Cr active sites that have improved oxygen binding energetics compared to those of pure Ir oxide. This work identifies IrCr as a promising new catalyst system that facilitates reduced precious metal loadings for acid-based OER catalysis.
Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: ACS Appl Mater Interfaces Assunto da revista: Biotecnologia / Engenharia Biomédica Ano de publicação: 2019 Tipo de documento: Artigo País de afiliação: Estados Unidos

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: ACS Appl Mater Interfaces Assunto da revista: Biotecnologia / Engenharia Biomédica Ano de publicação: 2019 Tipo de documento: Artigo País de afiliação: Estados Unidos