Construction of visible light–responsive Z-scheme CdS/BiOI photocatalyst with enhanced photocatalytic CO_2 reduction activity
Construction of visible light–responsive Z-scheme CdS/BiOI photocatalyst with enhanced photocatalytic CO_2 reduction activity
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DOI：
10.1557/jmr.2019.354
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发表时间：
2019-12
影响因子：
2.7
通讯作者：
Rong-Hui Zhou;Zhihong Wei;Yan-Yang Li;Zhongjun Li;H. Yao
中科院分区：
文献类型：
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作者：
Rong-Hui Zhou;Zhihong Wei;Yan-Yang Li;Zhongjun Li;H. Yao
Z型光催化剂的合理构建和Z型光催化剂的电荷转移机理的探索是CO_2还原领域的研究热点之一，对缓解能源危机和环境问题具有重要意义。在这项研究中，一系列的Z-计划CdS/BiOI复合材料的构建通过沉积CdS纳米粒子的表面上的BiOI纳米片。对合成材料进行了全面表征，并评价了其光还原CO2活性。结果表明，在可见光（λ > 400 nm）照射下，复合材料的光还原CO2活性高于CdS和BiOI。最佳复合物在3 h光照后的CO和CH 4产率分别为3.32和0.54 μmol/g。光催化活性的提高归因于复合材料中光生电荷的Z-模式转移。提出了CO_2还原的机理，并进行了实验验证。
Rational construction of Z-scheme photocatalysts and exploration of the Z-scheme charge transfer mechanism have drawn much attention in the field of CO_2 reduction because of its great potential to alleviate energy crisis and environmental problems. In this study, a series of Z-scheme CdS/BiOI composites were constructed by depositing CdS nanoparticles on the surface of BiOI nanosheets. The synthesized materials were characterized comprehensively, and their photoreduction CO_2 activities were evaluated. The results show that the composites exhibit higher photoreduction CO_2 activity under visible light irradiation (λ > 400 nm) than pure CdS and BiOI. The yields of CO and CH_4 for the optimal composite after 3 h irradiation are 3.32 and 0.54 μmol/g, respectively. The improved photocatalytic activity is attributed to Z-scheme transfer mode of the photogenerated charges in the composites. The mechanism of CO_2 reduction is proposed and verified experimentally.