文献类型：期刊文献

英文题名：Regulating oxygen vacancy of perovskites via A-site substitution to promote activity for photocatalytic HCHO oxidation under visible light

作者：Dai, Xin[1];Huang, Changfei[1];Yang, Shu[1];Zhou, Yanwen[1];Zou, Lian[1];An, Xin[1];Zhang, Shanshan[1];Song, Yuxuan[1];Zhou, Yanbo[3,4];Ma, Liang[2];Tian, Chengcheng[1,5]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Sichuan Univ, Coll Carbon Neutral Future Technol, Chengdu 610065, Peoples R China;[3]State Key Lab Coal Liquificat Gasificat & Utilizat, Shanghai 200237, Peoples R China;[4]Jinggangshan Univ, Sch Life Sci, Key Lab Jiangxi Prov Funct Biol & Pollut Control R, Jian 343009, Peoples R China;[5]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2025

卷号：376

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20252518619478);WOS:【SCI-EXPANDED(收录号:WOS:001513217200008)】；

基金：This work was finically supported by the National Natural Science Foundation of China (NSFC, Grant No. 52170109) , the Shanghai Science and Technology Innovation Plan (22DZ1208600) , and the Innovation Program of Shanghai Municipal Education Commission (2023ZKZD41) .

语种：英文

外文关键词：Oxygen vacancy; Perovskite catalyst; Photocatalytic HCHO degradation; Visible light

摘要：Oxygen vacancy-mediated photocatalytic reactions have been extensively studied for the elimination of environmental pollutants. Herein, we developed the Sr1-xLaxCoO3 (SLCO) photocatalysts with oxygen-rich vacancy using A-site substitution method for formaldehyde (HCHO) degradation. Benefiting from flexible composition and multiple valence states, SLCO catalysts display higher charge separation and transfer and a narrower band gap compared to SrCoO2.5 (SCO), contributing to improved efficiency of light utilization and the formation of reactive oxygen species. Notably, SLCO-2 (1-X/X = 2) exhibited the optimal catalytic activity with a conversion rate of up to 96 % for HCHO degradation in 15 min and long-term durability. Density functional theory (DFT) calculations further confirmed that SLCO-2 displayed appropriate thermodynamic formation energy of oxygen vacancy (-0.71 eV). O2 adsorbed on oxygen vacancies can be activated to form critical free radicals center dot O2- and 1O2, then participating in the degradation process of HCHO. This study highlights the role of oxygen vacancies in SLCO perovskite in photocatalysis and provides new perspectives for the rational design of photocatalysts with satisfactory performance.