科研之友
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摘要
Solar-driven photoelectrochemical (PEC) water splitting to produce hydrogen is one of the most ideal strategies for addressing energy crisis and environmental pollution. Designing and constructing high-efficient photoanode is the key to the practical application of PEC technology. Among various photoanodes, due to its fast charge transfer rate, high photothermal stability, non-toxicity and low cost etc, TiO2 nanoarrays have been widely used for the research of PEC water splitting. However, some intrinsic shortcomings of TiO2 including narrow photoabsorption range, high photogenerated charge recombination rate and sluggish oxygen evolution kinetics seriously restrict its solar-to-hydrogen conversion efficiency. According to the recent research work in our group and other group at home and abroad, this review elaborates the modification strategies for improving the PEC performance of TiO2 nanoarrays. More specifically, doping element could expand the light absorption range and improve the conductivity of TiO2 nanoarrays. Constructing heterojunction could efficiently promote the separation and transfer of photogenerated charges. Semiconductor sensitization would enhance the visible light absorption and accelerate the charge transfer. Surface treatment increases the rate of surface water oxidation reaction. Finally, we point out the existing problems and outlook the direction for future research. This review provides theoretical guidance and practical reference for further improving the PEC water splitting activity of TiO2 nanoarrays.
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单位羰基合成与选择氧化国家重点实验室; 中国科学院大学
