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

打开文本图片集

中图分类号：0643 doi： 10.1016/j.actphy.2025.100234

Interfacial stabilization of alkali metal oxis on carbon spheres for high-performance CO2 chemisorption

Feifan Zhao 1，Feiyan Xu1，2，* ， Jiaguo Yu 1，*

1 Laboratory of Solar Fuel， Faculty of Materials Science and Chemistry， China University of Geosciences， Wuhan ， Hubei Province， China.

² ， ， ， ， .

Abstract： Efficient capture oflow-concentration carbon dioxi （CO2） requires chemisorbents that couple strong reactivity with long-term structural stability. Alkali metal oxis are promising candidates but suffer from rapid sintering that severely reduces accessible active sites. Here we velop a universal interfacial strategy that immobilizes Li2O ， Na2O ，and K2O ashighly 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 oxi migration， enhance surface basicity， and significantly strengthen CO2 binding. Among the alkali metal-load hollow carbon spheres， K-HCS exhibits the highest CO2 uptake （4.9 mmol g-1 at 273K and 1bar）， fastest adsorption kinetics （ 13.56molkg-1h-1 at 313K and 1bar）， and optimal lowpressure removal efficiency （ 44% at 273K 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 oxis and provis mechanistic insights for advancing low-pressure CO2 capture materials.

Key Words： Alkali metal oxis;Hollow carbon spheres; CO2 chemisorption; Low-concentration CO2 capture; Flue gas purification

1引言

长期大规模使用化石燃料导致大气中二氧化碳浓度持续上升，引发全球变暖及一系列相关环境危机[1-10]。（剩余20216字）