Reddish GaN:ZnO photoelectrode for improved photoelectrochemical solar water splitting

The Journal of Chemical Physics
Zhiliang WangLianzhou Wang

Abstract

Efficient light harvesting is one of the key prerequisites in improving the solar conversion efficiency for photoelectrochemical water splitting. As classic semiconductors for water splitting, the solid state solution GaN:ZnO based photoanodes exhibit poor water splitting efficiency mainly limited by its light absorption. To overcome this bottleneck, here we report that phosphorus modification shifts the absorption edge of GaN:ZnO from 480 nm to the red end of 650 nm and also leads to one order of magnitude increase of the carrier concentration. Further, taking the surface phosphate groups as anchors, cobalt can be adsorbed, leading to the in situ formation of cobalt phosphate as a cocatalyst for water oxidation, which results in drastically improved photocurrent density and stability. This work highlights the significance of phosphorization treatment in extending the light harvest and changing the surface reaction kinetics for an efficient solar conversion process.

References

Jun 9, 2005·Journal of the American Chemical Society·Kazuhiko MaedaKazunari Domen
Mar 17, 2006·Nature·Kazuhiko MaedaKazunari Domen
Dec 18, 2008·Chemical Society Reviews·Matthew W KananDaniel G Nocera
Aug 25, 2009·Journal of the American Chemical Society·Gang LiuHui-Ming Cheng
Nov 11, 2010·Chemical Reviews·Michael G WalterNathan S Lewis
Feb 22, 2017·Nanotechnology·Miyeon LeeInsik In
Aug 21, 2018·Advanced Materials·Mu XiaoLianzhou Wang

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Citations

Jul 10, 2021·The Journal of Chemical Physics·Victor BatistaDunwei Wang
Oct 2, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Dennis ZywitzkiAnjana Devi

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