二酸化炭素の高効率電解還元を実現：重炭酸媒介型統合回収電解法 (Researchers Achieve Efficient Bicarbonate-mediated Integrated Capture and Electrolysis of CO2)

2026-01-13 中国科学院（CAS）

＜関連情報＞

• https://english.cas.cn/newsroom/research_news/chem/202601/t20260113_1145655.shtml
• https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.202523118

重炭酸塩媒介統合CO2回収・電気分解におけるイオン交換樹脂駆動型反応ミクロ環境制御 Ionomer-Driven Reaction Microenvironment Control in Bicarbonate-Mediated Integrated CO2 Capture and Electrolysis

Youwen Rong, Chuanchuan Yan, Dr. Xiaotong Li, Jing Liu, Prof. Dr. Xiaozhi Su, Prof. Dr. Guohui Zhang, Prof. Dr. Dunfeng Gao, Prof. Dr. Guoxiong Wang, Prof. Dr. Xinhe Bao
Angewandte Chemie International Edition  Published: 10 January 2026
DOI:https://doi.org/10.1002/anie.202523118

Graphical Abstract

A proton-conducting ionomer regulates the reaction microenvironment by increasing the local CO₂ concentration around a catalyst particle, resulting in a record CO partial current density of 410 mA cm⁻² at a low cell voltage of 3.09 V. The impressive bicarbonate electrolysis performance enables a promising bicarbonate-mediated integrated CO₂ capture and electrolysis process.

Abstract

Bicarbonate electrolysis coupling upstream CO₂ capture with electrochemical conversion of captured CO₂ presents an energy-efficient alternative to existing CO₂ electrolysis route. Yet, its practical application is impeded by unsatisfactory reaction rate and energy efficiency. Here, we have improved the bicarbonate electrolysis performance through manipulating reaction microenvironments by introducing ionomers into cobalt phthalocyanine (CoPc) electrodes. The Nafion-incorporated CoPc electrode exhibits a maximum CO partial current density of 410 mA cm⁻² at a low cell voltage of 3.09 V in a cation exchange membrane-based zero-gap electrolyzer. Electrode structure characterization and finite element simulation results indicate that the proton conductivity of the Nafion ionomer increases the local concentration of in situ generated CO₂ around CoPc catalyst, resulting in impressive CO production performance. A closed-loop demonstration using the Nafion-incorporated CoPc electrode and a simulated flue gas underscores the great promise of the bicarbonate-mediated integrated CO₂ capture and electrolysis process.