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Synthesis of visible and near infrared light sensitive amorphous titania for photocatalytic hydrogen evolution

Jiang, Jinghui, Tang, Xingwei, Zhou, Shujun, Ding, Jian, Zhou, Han, Zhang, Fan, Zhang, Di, Fan, Tongxiang
Green chemistry 2016 v.18 no.7 pp. 2056-2062
clean energy, green chemistry, hydrogen production, hydrolysis, near infrared radiation, photocatalysis, titanium, titanium dioxide, wavelengths
A simple and environmentally safe method of anaerobic hydrolysis was designed to synthesize amorphous TiO₂₋ₓ containing Ti³⁺ from the dissolution of Ti⁰ by water in an anaerobic environment. The disordered arrangement of atoms in amorphous TiO₂₋ₓ enables it to expand its light absorbing boundary from the ultraviolet to near infrared light region by narrowing its mobility gap to 1.5 eV. As a result, an effective visible and near infrared light photocatalytic hydrogen evolution from water splitting can be achieved by the as-synthesized amorphous TiO₂₋ₓ with the aid of Ti³⁺ to inhibit charge recombination. An ideal quantum yield of approximately 4.57% was achieved at a wavelength of 488 nm. This strategy represents a new approach to alter the activity of TiO₂, and it is meaningful for achieving green production of artificial clean energy.