Mesoporous black TiO2 array employing sputtered Au cocatalyst exhibiting efficient charge separation and high H2 evolution activity

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Shifei Kang
  • Shasha Li, University of Shanghai for Science and Technology
  • ,
  • Tingting Pu, University of Shanghai for Science and Technology
  • ,
  • Xueyou Fang, Yancheng Institute of Technology
  • ,
  • Chaochuang Yin, University of Shanghai for Science and Technology
  • ,
  • Mingdong Dong
  • Lifeng Cui, University of Shanghai for Science and Technology

The separation and transfer of photogenerated carriers are the key issue in the design of high performance TiO2 photocatalysts. In order to overcome the kinetic limitations and achieve rapid charge transfer, TiO2-related multi-component catalysts have been extensively studied. Among all the TiO2 supports, the impressive black TiO2 (BT) with broad visible light absorption spectrum and oxygen vacancies are preferable, but still suffers from low quantum efficiency. Meanwhile, poor control of cocatalyst placement by conventional loading method can also severely impede photocatalytic efficiency. Herein a fast and simple metal magnetron sputter approach was used to place highly-uniformed Au nanoparticles cocatalyst on the top of the mesoporous TiO2-BT nanotube array fabricated by in situ electrochemical anodization approach on a Ti film. This confined plasmonic photocatalyst with highly uniformly distributed Au cocatalysts exhibited greatly enhanced charge-separation and charge-transfer behavior, and a remarkable 10 times enhancement of the photocatalytic H-2 evolution reactivity over conventional TiO2 nanotube. The TiO2-BT-Au electron transfer cascade structure is proposed in which black TiO2 acts as a buffer layer for TiO2 conduction band electrons, allowing efficient photogenerated electrons to be transferred to Au nanoparticles and then into the TiO2 pores that suitable for H-2 generation. Since the nanotube walls themselves are curved upwards, the short diffusion length allows electrons to be easily transferred to the cocatalyst, where recombination of photogenerated electron pairs is limited. The metal magnetron sputter technique for noble metal cocatalyst immobilization and the unique TiO2-BT-Au electron-transfer system are promising and can be extended to the design of other supported catalysts. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume43
Issue49
Pages (from-to)22265-22272
Number of pages8
ISSN0360-3199
DOIs
Publication statusPublished - 6 Dec 2018

    Research areas

  • TiO2 nanotube arrays, Au nanoparticle, Hydrogen evolution, Black TiO2, Oxygen vacancies, Metal magnetron sputter, PHOTOCATALYTIC HYDROGEN-PRODUCTION, WATER-OXIDIZING CATALYSTS, MANGANESE COMPOUNDS, NANOTUBE ARRAYS, PARTICLE-SIZE, QUANTUM DOTS, NANOPARTICLES, DECOMPOSITION, ENHANCEMENT, PERFORMANCE

See relations at Aarhus University Citationformats

ID: 140091968