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Hydrogen peroxide reduction on single platinum nanoparticles.

ABSTRACT: Understanding oxygen reduction, key to much of electrochemical energy transformation technology, crucially requires exploration of the role of hydrogen peroxide as a possible intermediate especially on catalysts such as Pt which can bring about the 4e reduction of O₂ to water. We reveal that at the single nanoparticle scale the direct platinum catalysed reduction of hydrogen peroxide is found - even at high overpotentials - not to be controlled by the rate mass-transport of the reagents to the interface but by a surface limited process. Further under alkaline (pH 12.3) and near mass-transport free conditions, the single nanoparticle hydrogen peroxide reduction rate goes through a maximum at potentials comparable to the surface deposition of hydrogen (H _upd) with the highest reaction rate occurring when the surface is partially covered in hydrogen.

SUBMITTER: Chang X

PROVIDER: S-EPMC8159481 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Hydrogen peroxide reduction on single platinum nanoparticles.

Chang Xin X Batchelor-McAuley Christopher C Compton Richard G RG

Chemical science 20200408 17

Understanding oxygen reduction, key to much of electrochemical energy transformation technology, crucially requires exploration of the role of hydrogen peroxide as a possible intermediate especially on catalysts such as Pt which can bring about the 4e reduction of O<sub>2</sub> to water. We reveal that at the single nanoparticle scale the direct platinum catalysed reduction of hydrogen peroxide is found - even at high overpotentials - not to be controlled by the rate mass-transport of the reagen ...[more]

PMID: 34122898

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