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Issue 2, 2013
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Highly active nickel oxide water oxidation catalysts deposited from molecular complexes

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Abstract

Nickel oxide (NiOx) water oxidation catalysts with high catalytic activity have been electrodeposited from [Ni(en)3]Cl2 (en = 1,2-diaminoethane, NiOx-en) in a 0.10 M borate buffer (NaBi) solution (pH = 9.2). Electrolysis experiments at a fixed applied potential of 1.1 V (vs. Ag/AgCl) established that the NiOx-en films sustain a stable current of 1.8 mA cm−2 for extended periods, compared with 1.2 mA cm−2 for films derived from [Ni(OH2)6](NO3)2 and [Ni(NH3)6]Cl2 when tested in a 0.60 M NaBi buffer. XAS studies indicate that the γ-NiOOH phase is formed in each case whereas SEM studies revealed significant differences in film morphology. The NiOx-en films were found to be more homogenous and to have a higher electroactive surface area, as determined from capacitance measurements. The results highlight the influence that the choice of molecular precursor can have on the activity and robustness of electrodeposited NiOx water oxidation catalysts.

Graphical abstract: Highly active nickel oxide water oxidation catalysts deposited from molecular complexes

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Supplementary files

Article information


Submitted
10 Aug 2012
Accepted
03 Dec 2012
First published
04 Dec 2012

Energy Environ. Sci., 2013,6, 579-586
Article type
Paper

Highly active nickel oxide water oxidation catalysts deposited from molecular complexes

A. Singh, S. L. Y. Chang, R. K. Hocking, U. Bach and L. Spiccia, Energy Environ. Sci., 2013, 6, 579
DOI: 10.1039/C2EE23862D

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