Citation: Guancai Xie, Saad Ullah Jan, Zejian Dong, Yawen Dai, Rajender Boddula, Yuxuan Wei, Chang Zhao, Qi Xin, Jiao-Na Wang, Yinfang Du, Lan Ma, Beidou Guo, Jian Ru Gong. GaP/GaPN core/shell nanowire array on silicon for enhanced photoelectrochemical hydrogen production[J]. Chinese Journal of Catalysis, ;2020, 41(1): 2-8. doi: S1872-2067(19)63465-0 shu

GaP/GaPN core/shell nanowire array on silicon for enhanced photoelectrochemical hydrogen production

Guancai Xie ^a,b, ,
Saad Ullah Jan ^a,b ,
Zejian Dong ^a,b ,
Yawen Dai ^a,b ,
Rajender Boddula ^a ,
Yuxuan Wei ^a,b ,
Chang Zhao ^a,b ,
Qi Xin ^a ,
Jiao-Na Wang ^c ,
Yinfang Du ^c ,
Lan Ma ^c ,
Beidou Guo ^a,b ,
Jian Ru Gong ^a,b

a Chinese Academy of Sciences (CAS) Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchy Fabrication, National Center for Nanoscience and Technology, Beijing 100190, China;
b University of CAS, Beijing 100049, China;
c Beijing Institute of Fashion Technology, Beijing 100029, China

Received Date: 21 June 2019
Revised Date: 18 July 2019

Fund Project: These authors contributed equally to this paper.The authors acknowledge financial support for this work from the National Natural Science Foundation of China (21422303, 21573049, 21872043, 81602643), Beijing Natural Science Foundation (2142036), Youth Innovation Promotion Association, and Special Program of "One Belt One Road" of CAS.

Simultaneously improving the efficiency and stability on a large scale is significant for the development of photoelectrochemical (PEC) water splitting systems. Here, we demonstrated a novel design of GaP/GaPN core/shell nanowire (NW) decorated p-Si photocathode for improved PEC hydrogen production performance compared to that of bare p-Si photocathode. The formation of the p-n junction between p-Si and GaP NW promotes charge separation, and the lower conduction band position of GaPN relative to that of GaP further facilitates the transfer of photogenerated electrons to the electrode surface. In addition, the NW morphology both shortens the carrier collection distance and increases the specific surface area, which result in superior reaction kinetics. Moreover, introduction of N in GaP is beneficial for enhancing the light absorption as well as stability. Our efficient and facile strategy can be applied to other solar energy conversion systems as well.
- Core/shell nanowire,
- GaP,
- GaPN,
- Hydrogen production,
- Si,
- Solar water splitting,
- Tandem structure
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