抗坏血酸
催化作用
光催化
异质结
材料科学
铜
半导体
化学工程
选择性
氧化物
协同催化
纳米技术
化学
光电子学
冶金
有机化学
工程类
食品科学
作者
Lei Li,Changfa Guo,Tianqi Li,Changchun Yang,Chen Fang,Wentao Wang,Ruiqiang Yan,Jiqiang Ning,Yong Hu
标识
DOI:10.1016/j.apsusc.2023.159220
摘要
Efficient charge transfer across interfaces is highly desirable, but remains challenging in engineering semiconductor heterojunctions for photocatalysis. In this work, hybrid hetero-nanosheets (HNSs) of CuO/Cu2O bridged with interfacial Cu(II)-O-Cu(I) have been constructed via an in-situ topotactic transformation strategy, in which CuO nanosheets are partially reduced by ascorbic acid and transformed into Cu2O. The interfacial Cu(II)-O-Cu(I) bridges are found to provide fast transfer channels for photogenerated carriers transporting from CuO to Cu2O in an S-scheme pathway, leading to enhanced separation of photogenerated carriers. Furthermore, the bond bridges can tune the kinetic and thermodynamic processes of the CO2-to-CO conversion at interfacial Cu(I) catalytic sites by altering the rate-determined step and shifting downwards d-band center of the Cu(I) sites. Owing to the interfacial Cu(II)-O-Cu(I) bridges, the optimized CuO/Cu2O HNSs significantly expedite the CO2 photoreduction to CO, delivering a CO2 conversion rate of 22.14 μmol g−1 h−1 with a CO selectivity of 94.4%, outperforming the state-of-the-art copper oxide-based photocatalysts. This work demonstrates an effective in-situ topotactic transformation strategy to create interfacial bond bridges at heterogeneous interfaces for boosted photocatalysis as well as the critical roles of interface catalytic sites for CO2 conversion.
科研通智能强力驱动
Strongly Powered by AbleSci AI