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In Situ Formation of Pyridine-Type Carbonitrides-Modified Disorder-Engineered C-TiO2 Used for Enhanced Visible-Light-Driven Photocatalytic Hydrogen Evolution C

Xu, Xing, Lai, Lei, Zeng, Tao, Yu, Yan, He, Zhiqiao, Chen, Jianmeng, Song, Shuang
Journal of physical chemistry 2018 v.122 no.33 pp. 18870-18879
electrons, hydrogen, hydrogen production, lighting, oxygen, photocatalysis, photocatalysts, physical chemistry, raw materials, solar energy, titanium dioxide
The exploration of low-cost, high-performance, and stable photocatalysts for the highly efficient conversion and storage of solar energy in hydrogen is of great importance. This study presents a novel pyridine-type carbonitrides (CN)-modified surface-disordered C-doped TiO₂ (PCN/CTiO₂@TiO₂–ₓ) catalyst used for photocatalytic H₂ evolution from water. The employed preparation method of hydrolysis–calcination has the advantages of low-cost raw materials and easy scale-up. The optimized PCN/CTiO₂@TiO₂–ₓ exhibited an impressive hydrogen evolution rate of ∼3743 μmol h–¹ g–¹ under simulated solar light (AM 1.5) and remained stable after five cycles. The maximal quantum efficiency reached 37.5% at 370 nm and 7.0% at 400 nm, which was superior or comparable to several reported relevant TiO₂-based catalysts. Benefiting from the pyridine-type CN modification, disordered surface layer (TiO₂–ₓ), and increased oxygen vacancies/Ti³⁺ species, the photogenerated electrons moved rapidly from the visible-response C-doped TiO₂ to CN to participate in the photoreduction reaction, which led to a marked improvement in the catalytic activity.