文献类型：期刊文献

英文题名：Tuning Oxygen Defects in Co-Substituted LaMnO3 Perovskites for Efficient Visible-Light Formaldehyde Oxidation

作者：Zou, Lian[1];Zhang, Shanshan[1];An, Xin[1];Wang, Zhengcheng[1];Dai, Xin[1];Yang, Shu[1];Gao, Meng[1];Cui, Hai[1];Tian, Chengcheng[1,2]

机构：[1]East China Univ Sci & Technol, Integrated Res Platform Greener Hydrogen Prod & Ut, Shanghai, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai, Peoples R China

年份：2026

卷号：18

期号：13

外文期刊名：CHEMCATCHEM

收录：;EI(收录号：20262721054290);Scopus(收录号：2-s2.0-105043754403);WOS:【SCI-EXPANDED(收录号:WOS:001810276800001)】；

基金：This work was supported by the Innovation Program of Shanghai Municipal Education Commission (2023ZKZD41) and the China Baowu Iron & Steel Group Co., Ltd. Low-carbon Metallurgy Innovation Fund Project (BWLCF202408).

语种：英文

外文关键词：perovskite photocatalysts; B-site substitution; oxygen vacancies; formaldehyde oxidation

摘要：Coupling oxygen-defect chemistry with charge-transfer dynamics in perovskite catalysts for formaldehyde (HCHO) photocatalytic abatement under mild conditions remains challenging. Herein, a continuous series of LaMn1-xCoxO3 perovskites was synthesized via a facile Pechini method to elucidate the role of B-site Co substitution in visible-light-driven HCHO oxidation. The optimal composition, LaMn0.67Co0.33O3 (LMCO-2), achieves similar to 95% degradation of 100 ppm HCHO within 15 min (0.198 min-1). Comprehensive characterizations attribute this superior performance to a Co-induced defect-charge synergy, encompassing the proliferation of vacancy-associated surface oxygen species, enhanced oxygen mobility, improved low-temperature reducibility, a narrowed band gap, and accelerated charge separation. Mechanistic investigations reveal that photogenerated holes (h+) and singlet oxygen (1O2) act as dominant oxidative species, while superoxide radicals (center dot O2 -) serve as crucial intermediate precursors. Furthermore, in situ DRIFTS confirms a stepwise oxidation pathway involving dioxymethylene and formate intermediates prior to ultimate mineralization into CO2 and H2O.