直接成像不同晶面的 BiVO4 光催化剂上各向异性光生电荷分离
Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO4 Photocatalyst.
机构信息
State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Zhongshan Road 457, Dalian 116023 (China).
Graduate University of Chinese Academy of Sciences, Beijing 100049 (China Department).
出版信息
Angew Chem Int Ed Engl. 2015 Jul 27;54(31):9111-4. doi: 10.1002/anie.201504135. Epub 2015 Jul 3.
Spatially resolved surface photovoltage spectroscopy (SRSPS) was employed to obtain direct evidence for highly anisotropic photogenerated charge separation on different facets of a single BiVO4 photocatalyst. Through the controlled synthesis of a single crystal with preferentially exposed {010} facets, highly anisotropic photogenerated hole transfer to the {011} facet of single BiVO4 crystals was observed. The surface photovoltage signal intensity on the {011} facet was 70 times stronger than that on the {010} facets. The influence of the built-in electric field in the space charge region of different facets on the anisotropic photoinduced charge transfer in a single semiconductor crystal is revealed.
采用空间分辨表面光电压谱（SRSPS）获得了在单一半导体光催化剂的不同晶面上光生电荷分离具有高度各向异性的直接证据。通过控制合成具有优先暴露{010}晶面的单晶，观察到光生空穴在单 BiVO4 晶体的{011}晶面的高度各向异性转移。{011}晶面的表面光电压信号强度比{010}晶面强 70 倍。揭示了不同晶面空间电荷区的内建电场对单一半导体晶体中各向异性光致电荷转移的影响。
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