Engineering and Technology

Oxynitrides enabled photoelectrochemical water splitting with over 3,000 hrs stable operation in practical two-electrode configuration

Y. Xiao, X. Kong, et al.

This groundbreaking research showcases the stable operation of a Si and GaN photocathode for 3,000 hours without performance loss, with an innovative surface transformation enhancing hydrogen production. Conducted by Yixin Xiao, Xianghua Kong, and their esteemed colleagues, this study paves the way for efficient photoelectrochemical devices.

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Abstract

This paper demonstrates the stable operation of a photocathode comprising Si and GaN for 3,000 hrs without performance degradation in two-electrode configurations. The GaN nanowires on the Si photocathode transform *in situ* into Ga-O-N, enhancing hydrogen evolution. First-principles calculations reveal atomic-scale surface metallization of the *in situ* Ga-O-N species. This study overcomes the efficiency-stability dilemma of extrinsic cocatalysts, offering a path for practical photoelectrochemical devices.

Publisher

Nature Communications

Published On

Apr 11, 2023

Authors

Yixin Xiao, Xianghua Kong, Srinivas Vanka, Wan Jae Dong, Guosong Zeng, Zhengwei Ye, Kai Sun, Ishtiaque Ahmed Navid, Baowen Zhou, Francesca M. Toma, Hong Guo, Zetian Mi

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