多孔炭修饰的吸附催化一体化电极高效电解碳酸氢盐  

Catalytic adsorption integrated electrode modified by porous carbon for efficient electrolysis of bicarbonate

作　　者：王正峰 谢雨杭 李伟科 范永春 康钟尹 付乾[2,3] WANG Zhengfeng;XIE Yuhang;LI Weike;FAN Yongchun;KANG Zhongyin;FU Qian(Guangdong Electric Power Design Institute,China Energy Engineering Group,Guangzhou 510633,Guangdong,China;School of Energy and Power Engineering,Chongqing University,Chongqing 400030,China;Institute of Engineering Thermophysics,Chongqing University,Chongqing 400030,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广东广州510633 [2]重庆大学能源与动力工程学院,重庆400030 [3]重庆大学工程热物理研究所,重庆400030

出　　处：《化工进展》2024年第9期4892-4899,共8页Chemical Industry and Engineering Progress

基　　金：重庆市杰出青年科学基金(cstc2019jcyjjqX0020)。

摘　　要：电解碳酸氢盐体系可避免CO_(2)解吸过程中的能量密集型步骤,更具经济性及技术可行性。但目前阴极存在原位产生CO_(2)快速逃逸现象,CO_(2)不能充分参与反应并导致CO_(2)利用率低等问题,本文将活性炭(activated carbon,AC)作为吸附层修饰电极,与CO_(2)催化材料Ag均匀混合以构建吸附催化一体化电极,有效调控气体扩散电极孔隙结构,同时探究了不同炭材料的CO_(2)吸附特性对电解碳酸氢盐性能的影响。在Ag∶AC=4∶1、Ag纳米颗粒载量为2mg/cm^(2)、全氟磺酸-聚四氟乙烯共聚物(Nafion)质量分数为3.04%时,AC修饰Ag电极具有最高的CO法拉第效率,在100m A/cm^(2)和200m A/cm^(2)电流密度时分别达到59.02%和53.79%。稳定性测试表明该电极能够保持11h的高效运行,CO_(2)利用率达68.61%。证明了AC修饰的催化吸附一体化电极在电解碳酸氢盐体系中可有效吸附CO_(2),提高电化学性能。Electrolytic bicarbonate conversion that can avoid the energy-intensive steps(CO_(2) desorption)has attracted particular interest.However,the rapid escape of CO_(2) generated in the electrode leads to the insufficient participation of CO_(2) in the reaction and the low utilization rate of CO_(2).In this study,active carbon(AC)was used as an adsorption layer to modify the electrode.AC was mixed with CO_(2) catalytic material Ag to construct an catalytic adsorption integrated electrode(AC+Ag),Which effectively regulated the pore structure of the gas diffusion electrode.And it explored the influence of CO_(2) adsorption characteristics of different carbon materials on the performance during the electrolytic bicarbonate conversion.When Ag∶AC was 4∶1,Ag NPs loading was 2mg/cm^(2) and Nafion content was 3.04%,the AC+Ag electrode obtained the highest Faraday efficiency of CO.The FECO reached 59.02% and 53.79% at 100mA/cm^(2) and 200mA/cm^(2),respectively.The stability test showed that the electrode can stable convert bicarbonate to CO for 11h.Besides,a high CO_(2) utilization rate of 68.61%was obtained.This study proved that the AC-modified catalytic adsorption integrated electrode can effectively adsorb CO_(2) in the electrolytic bicarbonate conversion and improve the electrochemical performance.

关 键 词：电化学还原CO_(2) 原位还原CO_(2) 电解碳酸氢盐 电极结构 一体化电极 

分 类 号：TM911.4[电气工程—电力电子与电力传动]