文献类型：期刊文献

英文题名：Utilization of industrial-grade low-concentration CO2: Integrated approaches from enrichment to conversion

作者：Xv, Hui[1];Lv, Chunmei[1];Zheng, Hongbing[1];Wang, Minxuan[1];Dai, Bingyuan[1];Yang, Can[1];Ma, Cheng[1];Qiao, Wenming[1];Ling, Licheng[1];Zhang, Yongzheng[1,2];Wang, Jitong[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Nanning 530004, Peoples R China

年份：2026

卷号：320

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20253719166964);WOS:【SCI-EXPANDED(收录号:WOS:001576262100001)】；

基金：This work is supported by the National Natural Science Foundation of China (No.U21A2060, No.22178116) , Natural Science Foundation of Shanghai (No.22ZR1417400) , Fundamental Research Funds for the Central Universities (No.222201817001, No.50321041918013, No. JKA01221601) .

语种：英文

外文关键词：Resource utilization of CO2; Solid amine adsorbent; Enriched CO2; Ni single atom catalyst; CO2RR

摘要：The low concentration of CO2 in industrial emissions (similar to 10 %) makes its direct utilization for CO2 electrocatalytic reduction (CO2RR) challenging. This study presents an integrated approach combining CO2 enrichment with electrocatalytic reduction to address this limitation. A highly efficient solid amine adsorbent (RFCA-65 %PEI) was developed, leveraging mesoporous carbon to achieve a CO2 adsorption capacity of 185 mgg(-1) and enrich CO2 from 10 % to 42 % under optimized conditions. The enriched CO2 was then converted via a Ni single-atom catalyst (Ni-NMC), which exhibited exceptional selectivity, increasing the Faradaic efficiency (FECO) from 75 % to 92.3 % at -0.73 V (vs. RHE) in an H-cell. Further optimization revealed that electrolyte composition and gas flow rate critically influence the performance. Using 0.2 M KOH and a 20 mLmin(-1) inlet flow rate in a flow cell, Ni-NMC achieved FECO >95 % at 150 mAcm(-2), while maintaining >90 % efficiency over 18 h. In addition, the role of HCO3- in buffering local pH and suppressing competing hydrogen evolution was highlighted. This work not only demonstrates a viable pathway for industrial low-concentration CO2 valorization but also provides insights into the synergistic design of adsorption-electrocatalysis systems for sustainable carbon management.