Significantly enhanced charge transfer efficiency and surface reaction on NiP2/g-C3N4 heterojunction for photocatalytic hydrogen evolution

doi:10.1016/j.cjche.2021.12.019

Chinese Journal of Chemical Engineering ›› 2022, Vol. 43 ›› Issue (3): 31-39.DOI: 10.1016/j.cjche.2021.12.019

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Significantly enhanced charge transfer efficiency and surface reaction on NiP₂/g-C₃N₄ heterojunction for photocatalytic hydrogen evolution

Xiaoqing Yan, Hua An, Zihao Chen, Guidong Yang

XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China

Received:2021-08-31 Revised:2021-12-15 Online:2022-04-28 Published:2022-03-28
Contact: Guidong Yang,E-mail:guidongyang@xjtu.edu.cn
Supported by:
This work is supported by the National Natural Science Foundation of China (Grant Nos. U1862105, 22108214, 22050410267), Natural Science Basic Research Plan in Shaanxi Province of China (Grant Nos. 2017JZ001, 2018KJXX-008), Fundamental Research Funds for the Central Universities (Grant No. cxtd2017004), China Postdoctoral Science Foundation (Grant No. 2021TQ0262), the Promotion Plan for Young People of Shaanxi Association for Science and Technology (20210605) and K. C. Wong Education Foundation, Hong Kong, China.

Significantly enhanced charge transfer efficiency and surface reaction on NiP₂/g-C₃N₄ heterojunction for photocatalytic hydrogen evolution

Xiaoqing Yan, Hua An, Zihao Chen, Guidong Yang

XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China

通讯作者: Guidong Yang,E-mail:guidongyang@xjtu.edu.cn
基金资助:
This work is supported by the National Natural Science Foundation of China (Grant Nos. U1862105, 22108214, 22050410267), Natural Science Basic Research Plan in Shaanxi Province of China (Grant Nos. 2017JZ001, 2018KJXX-008), Fundamental Research Funds for the Central Universities (Grant No. cxtd2017004), China Postdoctoral Science Foundation (Grant No. 2021TQ0262), the Promotion Plan for Young People of Shaanxi Association for Science and Technology (20210605) and K. C. Wong Education Foundation, Hong Kong, China.

Abstract

Abstract: In this work, a novel NiP₂/g-C₃N₄ heterojunction via homogeneous precipitation method assisted by thermal phosphorization reaction was designed and constructed, and the optimized sample showed the excellent photocatalytic H₂ evolution activity under visible-light irradiation, which was nearly 112 times higher than that of pristine g-C₃N₄ sample. Experimental characterizations and DFT calculations demonstrated that the NiP₂ nanoparticles covered on the g-C₃N₄ surface can form a built-in electric field at the interface to accelerate the transfer of photoexcited electrons from g-C₃N₄ to NiP₂, crucial for hindering the recombination of electron-hole pairs. Moreover, the energy barrier of hydrogen evolution reaction can also vastly reduce when combined NiP₂ and g-C₃N₄ to construct NiP₂/g-C₃N₄ heterojunction. This work represents a method through combing experimental and theoretical tools to thoroughly investigate the mechanism of photocatalytic process.

Key words: Carbon neutrality, Charge transfer, Internal electric field, Photocatalytic H₂ generation

摘要： In this work, a novel NiP₂/g-C₃N₄ heterojunction via homogeneous precipitation method assisted by thermal phosphorization reaction was designed and constructed, and the optimized sample showed the excellent photocatalytic H₂ evolution activity under visible-light irradiation, which was nearly 112 times higher than that of pristine g-C₃N₄ sample. Experimental characterizations and DFT calculations demonstrated that the NiP₂ nanoparticles covered on the g-C₃N₄ surface can form a built-in electric field at the interface to accelerate the transfer of photoexcited electrons from g-C₃N₄ to NiP₂, crucial for hindering the recombination of electron-hole pairs. Moreover, the energy barrier of hydrogen evolution reaction can also vastly reduce when combined NiP₂ and g-C₃N₄ to construct NiP₂/g-C₃N₄ heterojunction. This work represents a method through combing experimental and theoretical tools to thoroughly investigate the mechanism of photocatalytic process.

关键词: Carbon neutrality, Charge transfer, Internal electric field, Photocatalytic H₂ generation

Xiaoqing Yan, Hua An, Zihao Chen, Guidong Yang. Significantly enhanced charge transfer efficiency and surface reaction on NiP₂/g-C₃N₄ heterojunction for photocatalytic hydrogen evolution[J]. Chinese Journal of Chemical Engineering, 2022, 43(3): 31-39.

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Significantly enhanced charge transfer efficiency and surface reaction on NiP₂/g-C₃N₄ heterojunction for photocatalytic hydrogen evolution

Significantly enhanced charge transfer efficiency and surface reaction on NiP₂/g-C₃N₄ heterojunction for photocatalytic hydrogen evolution

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