【摘 要】
：
With the increasing urgency of both energy crisis and environmental pollution, considerable efforts have been devoted to looking for appropriate materials that can utilize solar energy to split water
【机 构】
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Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern Univers
【出 处】
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1st International Conference on Computational Design and Sim
论文部分内容阅读
With the increasing urgency of both energy crisis and environmental pollution, considerable efforts have been devoted to looking for appropriate materials that can utilize solar energy to split water into hydrogen as a kind of clean energy.Hematite (α-Fe2O3) has attracted much attention for its suitable band gap (～2.2 eV) to absorb visible light up to ～40％, high stability in aqueous conditions, low cost and abundance on earth.Its theoretical solar to hydrogen efficiency is up to ～16％ with corresponding photocurrent of～14 mA/cm2.However, up to now, the reported optimum photocurrent is ～4 mA/cm2 by co-catalyst decoration.The major drawbacks that limit the solar conversion efficiency of α-Fe2O3 can be attributed to the low conductivity, weak optical absorption coefficient (α-1～0.12 μm, 550 nm), short life of photoelectron(10-12 s) and short diffusion length(2～4 nm) of photoholes.
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