Blue ordered/disordered Janus-type TiO2 nanoparticles for enhanced photocatalytic hydrogen generation
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 22828-22839 |
Journal / Publication | Journal of Materials Chemistry A |
Volume | 8 |
Issue number | 43 |
Online published | 8 Oct 2020 |
Publication status | Published - 21 Nov 2020 |
Externally published | Yes |
Link(s)
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.
Citation Format(s)
Blue ordered/disordered Janus-type TiO2 nanoparticles 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 journal › peer-review