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

Physical Chemistry Chemical Physics : PCCP
Chun DuBin Shan

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.

References

Nov 20, 2001·Nature·M Grätzel
Nov 11, 2010·Chemical Reviews·Michael G WalterNathan S Lewis
Feb 11, 2011·Journal of the American Chemical Society·Yongjing LinDunwei Wang
Mar 19, 2011·ChemSusChem·Kevin SivulaMichael Grätzel
Jul 12, 2011·Photochemistry and Photobiology·Eugen S AndreiadisVincent Artero
Aug 25, 2011·Journal of the American Chemical Society·Monica BarrosoJames R Durrant
Feb 7, 2012·Journal of the American Chemical Society·Benjamin KlahrJuan Bisquert
Jul 18, 2012·Journal of the American Chemical Society·Matthew T MayerDunwei Wang
Sep 7, 2012·Journal of the American Chemical Society·Benjamin KlahrThomas W Hamann
Sep 21, 2013·Scientific Reports·Jae Young KimJae Sung Lee
Oct 15, 2013·Angewandte Chemie·Chun DuDunwei Wang
May 14, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Laurence M Peter, K G Upul Wijayantha
Jun 26, 2014·Chemical Communications : Chem Comm·Kelley M H Young, Thomas W Hamann
Jul 30, 2014·ACS Applied Materials & Interfaces·Xiaogang YangDunwei Wang
Aug 13, 2015·Physical Chemistry Chemical Physics : PCCP·Omid Zandi, Thomas W Hamann
Jan 28, 2016·Physical Chemistry Chemical Physics : PCCP·Paula DiasAdélio Mendes
Nov 8, 2016·Physical Chemistry Chemical Physics : PCCP·Zhifeng Liu, Lu Yan
Nov 24, 2016·Physical Chemistry Chemical Physics : PCCP·Anupam SrivastavSahab Dass
Dec 16, 2016·ACS Applied Materials & Interfaces·Huayang ZhangShaobin Wang
Jan 27, 2017·Physical Chemistry Chemical Physics : PCCP·Junghyun ChoiUngyu Paik

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