光催化
异质结
材料科学
选择性
碳纳米管
反应性(心理学)
催化作用
纳米技术
化学工程
核化学
化学
有机化学
光电子学
病理
工程类
医学
替代医学
作者
Cheng‐Ying Hu,Jie Zhou,Chunyi Sun,Meng‐meng Chen,Xin‐Long Wang,Zhong‐Min Su
标识
DOI:10.1002/chem.201804925
摘要
Abstract As the main component of syngas, reducing CO 2 to CO with high selectivity through photocatalysis could provide a sustainable way to alleviate energy shortage issues. Developing a photocatalytic system with low cost and high performance that is environmentally friendly is the ultimate goal towards CO 2 photoreduction. Herein, an efficient and economic three‐component heterojunction photocatalyst is designed and fabricated for converting CO 2 to CO in the absence of organic sacrificial agents. The heterojunction is made of Cu 2− x S nanotubes coated with a carbon layer (C‐Cu 2− x S) and g‐C 3 N 4 . By using the classical MOF material HKUST‐1 as a precursor, hollow tubular‐like metal sulfides (C‐Cu 2− x S) with carbon coating were synthesized and further loaded on g‐C 3 N 4 , forming a three‐component heterojunction C‐Cu 2− x S@g‐C 3 N 4 . The carbon coat in C‐Cu 2− x S@g‐C 3 N 4 acts as an electron reservoir, which facilitates electron–hole pair separation. The optimized C‐Cu 2− x S@g‐C 3 N 4 acted as a photocatalyst in CO 2 reduction with a high reactivity of 1062.6 μmol g −1 and selectivity of 97 %. Compared with bare g‐C 3 N 4 (158.4 μmol g −1 ) and C‐Cu 2− x S, the reactivity is nearly 7 and 23‐fold enhanced and this CO generation rate is higher than most of the reported Cu 2 S or g‐C 3 N 4 composites under similar conditions. The prominent activity may result from enhanced light adsorption and effective charge separation. This work might open up an alternative method for the design and fabrication of high‐performance and low‐cost photocatalysts for efficiently and durably converting CO 2 to CO with high selectivity.
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