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Enhancing photocatalytic water splitting over nitrogen-rich BaTaO2N with Zr doping
Hongfei Sun1, Jiuyang Xiong1, Xia Ha2
1Chongqing Key Laboratory of Catalysis and New Environmental Materials, Engineering Research Center for Waste Oil Recovery Technology and Equipment, College of Environment and Resources, Chongqing Technology and Business University Chongqing 400067 China liuxc@ctbu.edu.cn.
Abstract:
Photocatalytic hydrogen production offers a promising solution for the energy crisis and environmental pollution, and the performance of the photocatalyst is crucial for enhancing the efficiency of hydrogen production. Achieving the intricate structure of metal-doped perovskite oxynitride as photocatalysts responsive to visible light continues to pose a significant challenge. BaTaO2N demonstrates excellent hydrogen evolution activity under visible light irradiation, and its absorption edge exceeds 600 nm. In this study, a N-rich BaTaO2N with Zr doping photocatalyst (1 wt% Zr) was successfully synthesized via a flux method, thereby enhancing its activity for photocatalytic water splitting. The apparent quantum efficiency (AQE) at 420 nm is measured to be 1.73%. Doping with Zr results in a narrower band gap in BaTaO2N and extends the electron lifetime. N-rich BaTaO2N significantly enhances the separation efficiency of photogenerated electrons and holes, thereby elevating the catalytic activity of the photocatalyst.
