Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (10): 20220206.doi: 10.7503/cjcu20220206

• Article: Inorganic Chemistry • Previous Articles     Next Articles

Pd-loaded Defective TiO2 Nanotube Arrays for Enhanced Photocatalytic Hydrogen Production Performance

JIANG Shan1,3, SHEN Qianqian1,3, LI Qi4, JIA Husheng1,3, XUE Jinbo1,2,3()   

  1. 1.Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China
    2.Department of Chemistry,Tsinghua University,Beijing 100084,China
    3.College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China
    4.School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China
  • Received:2022-04-04 Online:2022-10-10 Published:2022-05-10
  • Contact: XUE Jinbo E-mail:xuejinbo@tyut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(62004137);the Natural Science Foundation of Shanxi Province, China(20210302123102);the Key Research and Development Program of Shanxi Province, China(201803D421079);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China(2019L0156);the Research Project Supported by Shanxi Scholarship Council of China(2020-050)

Abstract:

Pd-TNT-Ni catalysts with different metal Pd contents were obtained on Ni-doped defective state TiO2 nanotube arrays(TNT-Ni) by photoreductive deposition method through oxygen vacancy induction. SEM, XPS, UV-Vis DRS, surface photovoltage(SPV), PL and electrochemical tests were employed to investigate the effect of strong interactions between Pd and Ni-doped defective state TiO2 nanotube arrays on their optical absorption properties and carrier separation and transport efficiency. The modulation mechanism of strong interaction on the regulation of the photocatalytic activity of the material was elucidated, and the action mechanism of Pd-enhanced Pd-TNT-Ni photocatalytic performance was proposed. The results demonstrated that the Pd nanoparticles prepared by photoreduction were 10—20 nm in size. The photoresponse of the Pd120-TNT-Ni sample showed 4.22 mA/cm2, which was 3.7 times higher than that of the unloaded TNT-Ni sample(1.14 mA/cm2). Meanwhile, Pd120-TNT-Ni had the most excellent average hydrogen production rate(5.16 mmol·g?1·h?1), which was nearly 12 times higher than that of the TNT catalyst(0.45 mmol·g?1·h?1). It was shown that the strong interaction between Pd and defective TiO2 nanotube arrays drove carrier separation and transport, while Pd as an electron trap and reactive site significantly improved the photocatalytic performance of the material, which had implications for the design and preparation of semiconductor materials with high photocatalytic activity.

Key words: Oxygen vacancy, Pd loading, Strong metal-support interaction, Defective state TiO2 nanotube array, Photocatalytic hydrogen production

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