SCI和EI收录∣中国化工学会会刊

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   

  1. 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   

  1. 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: 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