Preparation of Doped TiO2/Carbon and Visible-Light Catalytic Hydrogen Production
In situ composite of N,O-doped porous carbon nanosheets with N,C-doped TiO2 heterojunction photocatalyst were prepared by one-step pyrolysis using a deep eutectic sol-vent as precursors.The resulting porous heterojunction provides higher specific surface area and more active sites.The anatase and rutile TiO2 formed at high temperature form phase junction,which is beneficial to the separation of photogenerated electrons and holes,and in-hibits the recombination of photogenerated carriers.Element-doped two-phase TiO2 narrows the forbidden band width,broadens the absorption and utilization of visible light,and im-proves the photocatalytic reduction of water for hydrogen evolution.In addition,TiO2 com-posites with carbon nanosheets,and photogenerated electrons are transferred to the surface of carbon nanosheets,which further promotes the separation of photogenerated electrons and holes.The photocatalytic hydrogen production rate reached 28.7 mmol·(g·h)-1,under visible light,which is 29.3 times that of anatase TiO2 alone.
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