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Issue 21, 2017
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Ultrathin CoOx-modified hematite with low onset potential for solar water oxidation

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Abstract

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 VRHE 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 (VFB) 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 VRHE.

Graphical abstract: Ultrathin CoOx-modified hematite with low onset potential for solar water oxidation

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Publication details

The article was received on 13 Mar 2017, accepted on 06 May 2017 and first published on 22 May 2017


Article type: Paper
DOI: 10.1039/C7CP01588G
Phys. Chem. Chem. Phys., 2017,19, 14178-14184

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    Ultrathin CoOx-modified hematite with low onset potential for solar water oxidation

    C. Du, J. Wang, X. Liu, J. Yang, K. Cao, Y. Wen, R. Chen and B. Shan, Phys. Chem. Chem. Phys., 2017, 19, 14178
    DOI: 10.1039/C7CP01588G

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