Rational Design of an Efficient S-Scheme Heterojunction of CdS/Bi2WO6–S Nanocomposites for Photocatalytic CO2 Reduction
Rational Design of an Efficient S-Scheme Heterojunction of CdS/Bi2WO6–S Nanocomposites for Photocatalytic CO2 Reduction
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用于光催化 CO2 还原的 CdS/Bi2WO6-S 纳米复合材料的高效 S 型异质结的合理设计
DOI：
10.1021/acs.energyfuels.2c01076
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发表时间：
2022-05
期刊：
影响因子：
--
通讯作者：
Zhaohui Li
中科院分区：
文献类型：
--
作者：
Mingming Hao;Dingqiong Wei;Zhaohui Li
CdS/Bi 2 WO 6-S纳米复合材料，其中小立方CdS纳米粒子（约。采用胶体两相法制备了Bi 2 WO 6纳米片，并通过Cd 2+与S2-的沉淀反应制备了Bi 2 WO 6-S纳米片。由于CdS和Bi 2 WO 6-S之间存在有效的S型电荷转移途径，所制备的CdS/Bi 2 WO 6-S纳米复合材料在可见光下表现出上级的光催化还原CO2生成CO和CH 4的活性，其中以0.5 CdS/Bi 2 WO 6-S纳米复合材料的性能最佳.在0.5 CdS/Bi 2 WO 6-B纳米复合材料，其中立方CdS纳米粒子沉积在块体Bi 2 WO 6上相比，明显上级0.5 CdS/Bi 2 WO 6-S纳米复合材料的活性，突出了合理的界面工程的重要性，在S-计划异质结光催化系统的制造。这项工作表明，两个交错带排列的光催化剂的合理选择和它们的界面的精细调谐是重要的S-计划异质结的制造，以实现有效的异质结。
CdS/Bi2WO6–S nanocomposites, in which small cubic CdS nanoparticles (ca. 4 nm) assembled on thin orthorhombic Bi2WO6nanosheets (Bi2WO6–S), were fabricated through a facile precipitation of Cd2+with S2–in the presence of orthorhombic Bi2WO6nanosheets obtained via a colloidal two-phase method. As a result of the presence of an efficient S-scheme charge transfer pathway between CdS and Bi2WO6–S, the as-obtained CdS/Bi2WO6–S nanocomposites exhibit superior activity for photocatalytic CO2reduction to generated CO and CH4under visible light, with an optimum performance observed over the 0.5 CdS/Bi2WO6–S nanocomposite. The obvious superior activity over the 0.5 CdS/Bi2WO6–S nanocomposite compared to that over the 0.5 CdS/Bi2WO6–B nanocomposite, in which cubic CdS nanoparticles were deposited on bulk Bi2WO6, highlights the importance of a rational interface engineering in the fabrication of the S-scheme heterojunction photocatalytic systems. This work demonstrates that both a rational selection of two photocatalysts with staggered band alignment and a delicate tuning of their interface are important in the fabrication of the S-scheme heterojunction to realize an efficient photocatalysis.
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