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Van der Waals heterojunction for selective visible-light-driven photocatalytic CO2 reduction
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2020-11-26 , DOI: 10.1016/j.apcatb.2020.119733
Jun Li , Baojing Huang , Qiang Guo , Sheng Guo , Zhikun Peng , Jin Liu , Qingyong Tian , Yongpeng Yang , Qun Xu , Zhongyi Liu , Bin Liu

The product selectivity and efficiency of photocatalytic CO2 reduction are often restricted by the multi-electron transfer and reactive centers in the artificial photosynthetic system. To overcome these limitations, in this work, atomically thin carbon nitride (CN) coupled Bi9O7.5S6 (BOS) nanoplates were fabricated as a two-dimensional/two-dimensional (2D/2D) Van der Waals (VDW) heterojunction for CO2 photoreduction. Our experimental and density functional theory (DFT) calculations showed that the CO* could be adsorbed more strongly on BOS than CN, which could be further hydrogenated before desorption, explaining the observation why the main products of photocatalytic CO2 reduction on BOS was CH4 and CH3OH. Benefiting from the 2D/2D VDW heterojunction, 20CN/BOS revealed a CO generation rate of 37.2 μmol gcatalyst−1 under visible light irradiation, roughly 14.9-fold and 1.4-fold higher than that of BOS and CN alone. Our work paves a way to design new VDW hetero-structured photocatalysts for CO2 reduction to valuable products.



中文翻译:

Van der Waals异质结用于选择性可见光驱动的光催化CO 2还原

人工光合作用系统中的多电子转移和反应中心经常限制光催化CO 2还原的产物选择性和效率。为了克服这些限制,在这项工作中,原子薄的氮化碳(CN)耦合的Bi 9 O 7.5 S 6(BOS)纳米板被制成二维/二维(2D / 2D)范德华(VDW)异质结用于CO 2光还原。我们的实验和密度泛函理论(DFT)计算表明,CO *在BOS上的吸附能力强于CN,后者在脱附前可以进一步氢化,从而解释了为什么光催化CO 2的主要产物BOS的还原是CH 4和CH 3 OH。得益于2D / 2D VDW异质结,20CN / BOS在可见光照射下的CO生成速率为37.2μmolg催化剂-1,比单独的BOS和CN高约14.9倍和1.4倍。我们的工作为设计新的VDW异质结构光催化剂铺平了道路,该催化剂可将CO 2还原为有价值的产品。

更新日期:2020-12-03
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