Blue ordered/disordered Janus-type TiO2nanoparticles for enhanced photocatalytic hydrogen generation

Liangsheng Hu, Yong Li, Weiran Zheng, Yung Kang Peng, Shik Chi Edman Tsang, Lawrence Yoon Suk Lee (Corresponding Author), Kwok Yin Wong (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Photochemical hydrogen generation from water is a promising solution to concurrently tackle energy and environmental problems. However, the solar-to-hydrogen conversion efficiencies of most photocatalysts are still unsatisfactory due to two major limiting factors: the non-ideal band structure of photocatalysts and the fast recombination of photo-generated charge carriers. Herein, we report a Janus-type TiO2 heterojunction consisting of ordered blue-anatase and disordered black-rutile phases fabricated by the magnesiothermic reduction process. In this process, the surface enthalpy difference of rutile and anatase phases in P25-TiO2 allows the phase-selective reduction to afford novel blue ordered/disordered Janus heterostructure. The joint effect of the improved light absorption and charge separation by the disordered black-rutile phase and the high catalytic activity of the ordered blue-anatase phase, as well as the morphological advantage over order@disorder core-shell structures, significantly enhances the photocatalytic hydrogen production rate to 1.56 mmol h-1 g-1 (11.53 mmol h-1 g-1 with ∼1 wt% Pt), which delivers 13-fold enhancement compared to pristine P25-TiO2.

Original languageEnglish
Pages (from-to)22828-22839
Number of pages12
JournalJournal of Materials Chemistry A
Volume8
Issue number43
DOIs
Publication statusPublished - 21 Nov 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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