【摘 要】
：
Hydrogen production from solar water splitting shows great potential in solving the urgent energy and environmental issues[1],but its energy conversion effi
【机 构】
：
National Center for Nanoscience and Technology,China
【出 处】
：
The 6th International Conference on Nanoscience and Technolo
论文部分内容阅读
Hydrogen production from solar water splitting shows great potential in solving the urgent energy and environmental issues[1],but its energy conversion efficiency is always limited by the poor charge separation ability of the photocatalysts.II-VI group semiconductors are promising photocatalysts due to the excellent solar spectrum responses and suitable band positions for water splitting[2,3].Herein we constructed zinc blend-wurtzite(ZB-WZ)heterocrystalline structures in metal sulphide nanocrystals via an ultrasonic assisted solvothermal method,and found that these nanocrystals exhibited a superior hydrogen production activity under visible light because of the efficient spatial charge separation in the heterocrystalline structure.In addition to the staggered band alignment,the spontaneous formation of a saw-tooth potential profile in the ZB-WZ heterocrystalline can further accelerate the spatial charge separation.The theoretical simulation results prove that the spatial charge separation is dominated by spontaneous polarization,and also indicate that the charge separation ability of the heterocrystalline can be varied by changing its specific configuration.Hence,tuning the heterocrystalline structure with atomic precision is a promising strategy for developing novel and efficient photocatalysts.
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