Construction of atomically dispersed Cu sites and S vacancies on CdS for enhanced photocatalytic CO2 reduction. Issue 30 (2nd July 2021)

• Record Type: Journal Article
• Authors: Cao, Heng; Xue, Jiawei; Wang, Zhiyu; Dong, Jingjing; Li, Wenjie; Wang, Ruyang; Sun, Song; Gao, Chen; Tan, Yisheng; Zhu, Xiaodi; Bao, Jun
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 30(2021)
• Page Start: 16339
• Page End: 16344
• Publication Date: 2021-07-02
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta03615g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Cu–Cd cation exchange introduced active sites on CdS, which promoted CO2 adsorption and activation. Abstract : The controllable introduction of anion vacancies (such as O vacancies and S vacancies) or atomically dispersed metal sites in semiconductors is a promising strategy to improve photocatalytic performance. However, the facile construction of a photocatalyst containing two types of potential active sites simultaneously is still challenging. Herein, we adopt a facile cation exchange strategy to create atomically dispersed Cu sites and accompanying sulfur vacancies on the CdS surface for photocatalytic CO2 reduction. The fabricated CuCdS-5 sample exhibits 3 times improvement in CO yield with a selectivity of 92% in comparison to original CdS. Experimental analysis and DFT calculations reveal that the atomically dispersed Cu sites and S vacancies provide additional CO2 adsorption sites, redistribute the local charges and lower the dissociative adsorption energy of CO2, which enhance the photocatalytic activity. Our work provides a new perspective to design semiconductors with engineered active sites for efficient photocatalytic CO2 reduction.