A bismuth rich hollow Bi4O5Br2 photocatalyst enables dramatic CO2 reduction activity
A bismuth rich hollow Bi4O5Br2 photocatalyst enables dramatic CO2 reduction activity
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富含铋的中空 Bi4O5Br2 光催化剂可实现显着的二氧化碳减排活性
DOI：
10.1016/j.nanoen.2019.103955
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发表时间：
2019-10-01
期刊：
影响因子：
17.6
通讯作者：
Chen, Gang
中科院分区：
文献类型：
--
作者：
Jin, Xiaoli;Lv, Chade;Chen, Gang
光生载流子的分离不足和微弱的CO2捕获仍然是光催化转化CO2为太阳能燃料的主要障碍。合理设计具有独特结构的半导体光催化剂有望打破这一瓶颈。在此，富含铋的Bi 4 O 5 Br 2空心微球被设计为一种强大的光催化剂，用于有效减少CO2。由于富铋策略，高度分散的能带结构和升高的导带（CB）电位促进了电荷转移和光还原能力。同时，中空结构提供了大的比表面积，并在其内部产生共振，以增强CO2的吸附和活化。由于协同促进效应，局部电荷排列和电子结构得到了调整，从而使光催化CO2转化为CO的效率得到了显著提高（3.16 μ mol g（-1）h（-1））和CH4（0.5 μ mol g（-1）h（-1）），优于固体Bi_4 O_5 Br_2和BiOBr以及其它已报道的Bi基光催化剂的上级性能。这项工作为探索高效CO2光还原催化剂提供了新的机会。
The insufficient separation of photogenerated charge carriers and faint CO2 capture remains the major obstacles for photocatalytic conversion of CO2 into solar fuel. Rational design of semiconductor photocatalysts with unique structures may be promising to break this bottleneck. Herein, bismuth rich Bi4O5Br2 hollow microspheres are designed as a robust photocatalyst for efficient CO2 reduction. Thanks to the bismuth rich strategy, the highly dispersed band structure and the elevated conduction band (CB) potential facilitate the charge transfer and photoreduction ability. Meanwhile, hollow structure provides the large specific area and creates a resonance in its interior to enhance the CO2 adsorption and activation. Benefiting from the collaborative promotion effect, the local charge arrangement and electronic structure are tuned so as to an exceptional efficiency of photocatalytic CO2 conversion into CO (3.16 mu mol g(-1) h(-1)) and CH4 (0.5 mu mol g(-1)h(-1)) is attained over hollow Bi4O5Br2, which is superior to that of solid Bi4O5Br2 and BiOBr, as well as other reported Bi-based photocatalysts. This work paves new opportunities for exploring high-efficiency CO2 photoreduction catalysts.