Surface defect and lattice engineering of Bi5O7Br ultrathin nanosheets for efficient photocatalysis
Surface defect and lattice engineering of Bi5O7Br ultrathin nanosheets for efficient photocatalysis
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DOI：
10.1007/s12274-022-4748-x
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发表时间：
2022-08
期刊：
影响因子：
9.9
通讯作者：
Yunjing Wang;H. He;Yunjiang Wang;M. Xie;F. Jing;Xianhong Yin;Feilong Hu;Yan Mi
中科院分区：
文献类型：
--
作者：
Yunjing Wang;H. He;Yunjiang Wang;M. Xie;F. Jing;Xianhong Yin;Feilong Hu;Yan Mi
光生成的载流子在本体和光催化剂表面的有效分离和迁移将显著提高光催化效率。然而，在这两方面对光电荷的同步调节是具有挑战性的。本文通过结合氧化溴化铋的表面缺陷和晶格工程，将本体和表面光荷同时分离，以提高光催化活性。深度调制的Bi5O7Br超薄纳米片在晶体结构中含有丰富的铋，增加了内部电场，促进了光电荷从体向表面的分离和迁移。在纳米片表面产生氧空位（OVs）会形成局部电场，从而刺激电荷向催化剂表面的活性位点迁移。因此，ov组装的Bi5O7Br纳米片在模拟太阳光照下表现出更高的光催化降解效率。本研究证明了基于集成策略的电场调制控制电荷的可能性。
The effective separation and migration of photogenerated charge carriers in bulk and on the surface of photocatalysts will significantly promote photocatalytic efficiency. However, the synchronous regulation of photocharges on both counts is challenging. Herein, the simultaneous separation of bulk and surface photocharges is conducted to enhance photocatalytic activity by coupling the surface defects and lattice engineering of bismuth oxybromide. The depth-modulated Bi5O7Br ultrathin nanosheets with an abundance of bismuth in the crystal structure increased the internal electric field, which propelled the separation and migration of photocharges from bulk to the surface. Creation of oxygen vacancies (OVs) on the nanosheet surface forms local electric fields, which can stimulate the migration of charges to active sites on the catalyst surface. Therefore, the OV-assembled Bi5O7Br nanosheets demonstrated enhanced photocatalytic degradation efficiency under simulated solar-light illumination. This study proved the possibility of charge governing via electric field modulation based on an integrated strategy.