【摘要】 <正>半导体光催化可利用太阳能引发众多氧化还原反应，其中最受关注的是将水分解为氢气和氧气^[1]，将二氧化碳还原为高值化学品^[2]，以及将水和空气中污染物进行氧化还原消除^[3]，为解决人类面临的能源危机和环境恶化等问题提供了极具前景的解决方案。如何提高效率是光催化应用过程中面临的首要问题，而对光催化机制的深入理解是提高光催化效率的必要前提。最近，中国科学院大连化学物理研究所李灿院士、更多还原

【Abstract】 A series of spatiotemporally resolved surface photovoltage techniques were used to investigate the pho-togenerated charge transfer process within sub-picosecond to second timescale and at sub-micrometer level on single-particle cuprous oxide photocatalyst. A spatiotemporal charge transfer image was pictured. It is found that the high efficiency in charge separation of the facet-specific cuprous oxide single-particle originates mainly from the ultrafast quasi-ballistic inter-facet hot electron transfer process. These findings give a fascinating and deep insight into the photoinduced charge transfer mechanism in semiconductor photocatalyst, and pave a refreshed way to developing photocatalyst.更多还原