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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Liangsheng Hu
  • Yong Li
  • Weiran Zheng
  • Shik Chi Edman Tsang
  • Lawrence Yoon Suk Lee
  • Kwok-Yin Wong

Detail(s)

Original languageEnglish
Pages (from-to)22828-22839
Journal / PublicationJournal of Materials Chemistry A
Volume8
Issue number43
Online published8 Oct 2020
Publication statusPublished - 21 Nov 2020
Externally publishedYes

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 TiOheterojunction 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.

Citation Format(s)

Blue ordered/disordered Janus-type TiOnanoparticles for enhanced photocatalytic hydrogen generation. / Hu, Liangsheng; Li, Yong; Zheng, Weiran; Peng, Yung-Kang; Tsang, Shik Chi Edman; Lee, Lawrence Yoon Suk; Wong, Kwok-Yin.

In: Journal of Materials Chemistry A, Vol. 8, No. 43, 21.11.2020, p. 22828-22839.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review