Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 21, Pages 14178-14184Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp01588g
Keywords
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Funding
- National Basic Research Program of China [2013CB934800]
- National Natural Science Foundation of China [51302094, 51572097, 51575217]
- Hubei Province Funds for Distinguished Young Scientists [2015CFA034, 2014CFA018]
- Fundamental Research Funds for the Central Universities, HUST [2015QN009]
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Photoelectrochemical water splitting holds great potential for solar energy conversion and storage with zero greenhouse gas emission. Integration of a suitable co-catalyst with an absorber material enables the realization of highly efficient photocleavage of water. Herein, nanostructured hematite film was coated with an ultrathin and conformal CoOx overlayer through atomic layer deposition (ALD). The best performing hybrid hematite with a 2-3 nm ALD CoOx overlayer yielded a remarkable turn on potential of 0.6 V-RHE for the water oxidation reaction. Moreover, material analyses revealed that the surface amorphous CoOx/Co(OH)(2) component exhibited good optical transparency and hydrophilic properties, which were beneficial for the formation of an ideal hematite/electrolyte interface. In addition to the presence of the CoOx overlayer, a negative shift of flat band potential (V-FB) as well as suppression of surface recombination helped to significantly promote the charge separation and collection properties, contributing to the overall solar conversion efficiency. As a result, the external quantum efficiency (IPCE) obtained on hematite increases by 66% at 1.23 V-RHE.
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