Crucial role of hydroxyl in CO selectivity for integrated CO2 capture and electrocatalytic reduction

作者：Shaona Wang, Yang Yang, Wenqing Xu, Zhuoshu Bai, Fabing Su, Yixi Wang, Dingrong Bai, Tingyu Zhu · 发表于：Carbon Neutrality · 年份：2026 · DOI：10.1007/s43979-025-00157-4 · 被引用次数：1 · 研究领域：CO2 Reduction Techniques and Catalysts、Chemical Looping and Thermochemical Processes、Carbon Dioxide Capture Technologies

Abstract As an integrated CO 2 capture and utilization (ICCU) process, direct electrochemical reduction of amine captured-CO 2 reduction reaction (cCO 2 RR) has enormous advantages in energy efficiency and operating cost. The low product selectivity is an urgent issue. Here, we found that the hydroxyl (-OH) on CeO 2 can significantly enhance CO selectivity. After hydroxyl modification, the CO faraday efficiency (FE CO ) was surprisingly increased by 188% (relative increase rate). The correlation coefficient between -OH quantity and FE CO is as high as 0.98. Further study indicated that the presence of -OH can lead to a more compact electrochemical double layer (EDL) and charge transfer resistance by proton transfer. The -OH can also enhance CO 2 adsorption and stabilize the intermediate species (*COOH). DFT results further demonstrate that the rate-determining step was proton transfer from the surface -OH to MEACOO − , -OH modification can reduce the energy barrier to as low as 0.39 eV. This work provides additional insights into improving selectivity in amine-based cCO 2 RR, advancing the development of ICCU technology.