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 language | English |
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Pages (from-to) | 22828-22839 |
Number of pages | 12 |
Journal | Journal of Materials Chemistry A |
Volume | 8 |
Issue number | 43 |
DOIs | |
Publication status | Published - 21 Nov 2020 |
ASJC Scopus subject areas
- General Chemistry
- Renewable Energy, Sustainability and the Environment
- General Materials Science