物理化学学报2026，Vol.42Issue(5)：152-164,13.DOI:10.1016/j.actphy.2025.100234
碳球上碱金属氧化物的界面稳定化用于高性能CO2化学吸附
Interfacial stabilization of alkali metal oxides on carbon spheres for high-performance CO2 chemisorption
摘要
Abstract
Efficient capture of low-concentration carbon dioxide(CO2)requires chemisorbents that couple strong reactivity with long-term structural stability.Alkali metal oxides are promising candidates but suffer from rapid sintering that severely reduces accessible active sites.Here we develop a universal interfacial strategy that immobilizes Li2O,Na2O,and K2O as highly dispersed amorphous domains on hollow carbon spheres(named Li-HCS,Na-HCS,and K-HCS)forming robust M-O-C anchor sites.These interfacial structures prevent oxide migration,enhance surface basicity,and significantly strengthen CO2 binding.Among the alkali metal-loaded hollow carbon spheres,K-HCS exhibits the highest CO2 uptake(4.9 mmol g-1 at 273 K and 1bar),fastest adsorption kinetics(13.56 mol kg-1 h-1 at 313 K and 1bar),and optimal low-pressure removal efficiency(44%at 273 K and 0.15 bar).Density functional theory calculations further reveal a monotonic increase in adsorption strength and molecular activation from Li to Na to K,driven by enhanced electron donation and polarizability.This work establishes a broadly applicable route for stabilizing alkali metal oxides and provides mechanistic insights for advancing low-pressure CO2 capture materials.关键词
碱金属氧化物/空心碳球/二氧化碳化学吸附/低浓度二氧化碳捕集/烟气净化Key words
Alkali metal oxides/Hollow carbon spheres/CO2 chemisorption/Low-concentration CO2 capture/Flue gas purification分类
化学化工引用本文复制引用
赵非凡,徐飞燕,余家国..碳球上碱金属氧化物的界面稳定化用于高性能CO2化学吸附[J].物理化学学报,2026,42(5):152-164,13.基金项目
国家重点研发计划(2022YFE0115900) （2022YFE0115900）
国家自然科学基金(22238009,22378371,U23A20102和22361142704)以及湖北省自然科学基金(2022CFA001和2023AFA088). （22238009,22378371,U23A20102和22361142704）
