Citation: Feifan Zhao, Feiyan Xu, Jiaguo Yu. Interfacial stabilization of alkali metal oxides on carbon spheres for high-performance CO₂ chemisorption[J]. Acta Physico-Chimica Sinica, ;2026, 42(5): 100234. doi: 10.1016/j.actphy.2025.100234 shu

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

Feifan Zhao ¹ ,
Feiyan Xu ^{1, 2,,} ,
Jiaguo Yu ^1,,

1.
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Province, China
2.
Instituto Universitario de Tecnología Química, CSIC-UPV, Universitat Politècnica de València, Valencia 46022, Spain

Corresponding author: Feiyan Xu, xufeiyan@cug.edu.cn Jiaguo Yu, yujiaguo93@cug.edu.cn
Received Date: 12 December 2025
Revised Date: 22 December 2025
Accepted Date: 23 December 2025

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.
- Alkali metal oxides,
- Hollow carbon spheres,
- CO₂ chemisorption,
- Low-concentration CO₂ capture,
- Flue gas purification
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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