Highly active nickel oxide water oxidation catalysts deposited from molecular complexes

Singh, Archana, Chang, Shery L.Y., Hocking, Rosalie K., Bach, Udo, and Spiccia, Leone (2013) Highly active nickel oxide water oxidation catalysts deposited from molecular complexes. Energy & Environmental Science, 6 (2). pp. 579-586.

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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.

Item ID: 28912
Item Type: Article (Research - C1)
ISSN: 1754-5706
Funders: Australian Research Council (ARC)
Date Deposited: 21 Aug 2013 09:22
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 100%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 50%
97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
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