Surface etching induced ultrathin sandwich structure realizing enhanced photocatalytic activity
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Photocatalytic conversion efficiency is limited by serious charge carrier recombination. Efficient carrier separation is usually achieved by elegantly-designed multi-component structures connected by directional electric field. Herein, we developed a two-dimensional (2D) sandwich structure, as a new photocatalytic system, to realize high-efficiency carrier separation. This strategy integrated multifunction into a single structure for the first time, which successfully introduces a stable built-in electric field, realizing high-effective carrier separation. Besides, the carrier concentration is dramatically increased due to dimensional confinement. Benefiting from above synergic advantages, 2D sandwich photocatalyst achieves the highest nitrogen fixation rate (435 μmol g−1 h−1) in inorganic solid photocatalysts under visible light irradiation. We anticipate that 2D sandwich photocatalyst holds promises for the application and expansion of 2D materials in photocatalysis research.
Keywordstwo-dimensional materials photocatalysis sandwich structure surface modification nitrogen fixation
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This work was supported by the National Basic Research Program of China (2015CB932302), the National Natural Science Foundation of China (U1432133, 11321503, 21701164), the National Young Top-Notch Talent Support Program, the Chinese Academy of Sciences (XDB01020300), the Fok Ying-Tong Education Foundation (141042), the Fundamental Research Funds for the Central Universities (WK2060190027, WK2060190058). We would like to thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) and the Catalysis and Surface Science Endstation (National Synchrotron Radiation Laboratory) for providing the beam time.