Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 8, Issue 12, Pages 3539-3544Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ee02443a
Keywords
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Funding
- NRF [NRF 2010-0029245]
- Global Frontier R&D Program on Centre for Multiscale Energy System - Ministry of Education, Science and Technology of Korea [NRF-2011-0031571]
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In spite of their remarkable enhancement in visible light absorption, black TiO2 materials have failed to demonstrate expected photocatalytic activity in visible light due to the presence of a high number of recombination centers. In this report, a new controlled magnesiothermic reduction has been developed to synthesize reduced black TiO2 under a 5% H-2/Ar atmosphere. The material possesses an optimum band gap and band position, oxygen vacancies, surface defects, and charge recombination centers and shows significantly improved optical absorption in the visible and infrared region. The synergistic effects enable the black TiO2 material to show an excellent hydrogen production ability in the methanol-water system in the presence of Pt as a co-catalyst. The maximum hydrogen production rates are 43 mmol h(-1) g(-1) and 440 mu mol h(-1) g(-1), along with remarkable stability under the full solar wavelength range of light and visible light, respectively, and these values are superior to those of previously reported black TiO2 materials.
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