Journal
CHEMSUSCHEM
Volume 8, Issue 8, Pages 1394-1403Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201403188
Keywords
cobalt; electrochemistry; energy conversion; heterogeneous catalysis; water splitting
Funding
- Australian Research Council (ARC) through the ARC Centre of Excellence for Electromaterials Science
- Australian Research Council (ARC) through an Australian Laureate Fellowship
- Australian Government
- Alexander von Humboldt Foundation
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Efficient catalysis of water oxidation represents one of the major challenges en route to efficient sunlight-driven water splitting. Cobalt oxides (CoOx) have been widely investigated as water oxidation catalysts, although the incorporation of these materials into photoelectrochemical devices has been hindered by a lack of transparency. Herein, the electrosynthesis of transparent CoOx catalyst films is described by utilizing cobalt(II) aminopolycarboxylate complexes as precursors to the oxide. These complexes allow control over the deposition rate and morphology to enable the production of thin, catalytic CoOx films on a conductive substrate, which can be exploited in integrated photoelectrochemical devices. Notably, under a bias of 1.0V (vs. Ag/AgCl), the film deposited from [Co(NTA)(OH2)(2)](-) (NTA=nitrilotriacetate) decreased the transmission by only 10% at =500nm, but still generated >80% of the water oxidation current produced by a [Co(OH2)(6)](2+)-derived oxide film whose transmission was only 40% at =500nm.
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