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Issue 31, 2015
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Fast magnetically driven electrodeposition of amorphous metal oxide water oxidation catalysts from carbon-coated metallic nanoparticles

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Abstract

We report a new approach for efficient electrodeposition of amorphous metal oxide water oxidation catalysts on an electrode surface. A catalytic metal-based film was obtained by means of anodic oxidation of metallic nanoparticles, namely carbon-coated cobalt nanoparticles or carbon-coated nickel nanoparticles. Interestingly, these particles are intrinsically conductive and possess magnetic properties which make it easy to collect them on an electrode surface using a simple magnet to form a porous conductive particulate film. Upon anodic polarization in an appropriate electrolyte, the particulate film is rapidly converted into an amorphous metal-based catalytic film that efficiently catalyzes the oxidation of water at neutral pH. Compared to Nocera's method based on anodic electrodeposition of a metal salt in solution, this new electrodeposition strategy offers the key advantage of supplying metal ions in a solid and metallic form, leading to a fast release of high local concentrations of metal ions right at the spot of the film formation (i.e., in the vicinity of the electrode surface). This plays a decisive role in the formation rate of the catalytic film, allowing the deposition of the oxygen-evolving catalyst in a remarkably short-time. Moreover, the methodology can be easily extended to a wide range of metal particles of different nature and sizes, and also to their mixtures, finally offering a new degree of flexibility and opportunities not only in the preparation of metal-based water oxidation catalysts, but also in the preparation of inorganic metal-based catalysts for hydrogen or oxygen evolution.

Graphical abstract: Fast magnetically driven electrodeposition of amorphous metal oxide water oxidation catalysts from carbon-coated metallic nanoparticles

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Article information


Submitted
10 May 2015
Accepted
26 Jun 2015
First published
01 Jul 2015

J. Mater. Chem. A, 2015,3, 16190-16197
Article type
Paper
Author version available

Fast magnetically driven electrodeposition of amorphous metal oxide water oxidation catalysts from carbon-coated metallic nanoparticles

J. Zhu, F. Lambert, C. Policar, F. Mavré and B. Limoges, J. Mater. Chem. A, 2015, 3, 16190
DOI: 10.1039/C5TA03430B

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