活性炭负载Ni-N-C催化剂提升电解碳酸氢盐法拉第效率  

Active carbons supported Ni-N-C catalysts for enhanced Faraday efficiency of electrolytic bicarbonate

作　　者：王正峰 谢雨杭 范永春 李伟科 付乾[2,3] WANG Zhengfeng;XIE Yuhang;FAN Yongchun;LI Weike;FU Qian(China Energy Engineering Group Guangdong Electric Power Design Institute,Guangzhou 510633,Guangdong,China;Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University),Ministry of Education,Chongqing 400030,China;Institute of Engineering Thermophysics,School of Energy and Power Engineering,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]重庆大学低品位能源利用及系统教育部重点实验室,重庆400030 [3]重庆大学能源与动力工程学院,工程热物理研究所,重庆400030

出　　处：《化工学报》2023年第11期4570-4577,共8页CIESC Journal

基　　金：重庆市杰出青年科学基金项目(cstc2019jcyjjq X0020)。

摘　　要：直接电解碳酸氢盐可避免CO_(2)解吸的高耗能步骤,为将CO_(2)转化为增值化学品提供了一条具有商业前景的路径。寻找廉价、高效的电解碳酸氢盐催化剂以替代贵金属催化剂(如Ag),是一项重要的工作。本研究将Ni-N-C催化剂引入电解碳酸氢盐体系,以活性炭为碳载体制备了具有发达孔隙结构的Ni-N-C催化剂,为电解碳酸氢盐提供了丰富的催化活性位点和充足的物质传输通道。在N_(2)饱和的3.0 mol·L^(-1)KHCO_(3)溶液中,Ni-N-C催化剂在100 mA·cm^(-2)的电流密度时CO法拉第效率(FECO)为57.2%,相同条件下Ag催化剂的FECO仅为42%。本研究证明了Ni-N-C催化剂在电解碳酸氢盐体系中可以取代Ag将碳酸氢盐转化为CO。Direct electrolytic bicarbonate can avoid the energy-intensive step of CO_(2) desorption,thus offering a promising route to convert CO_(2) into value-added chemicals.It is an important task to find cheap and efficient electrolytic bicarbonate catalysts to replace noble metal catalysts(e.g.,Ag).In this study,nickel-nitrogen-carbon(Ni-N-C)catalysts were introduced into the electrolytic bicarbonate system.Ni-N-C catalysts with abundant pore structure were prepared by anchoring Ni single atoms on active carbons,which provided abundant catalytic active sites and sufficient material transport channels for electrolytic bicarbonate.When operated in the N_(2)-saturated 3.0 mol·L^(-1) KHCO_(3) solution,the Ni-N-C catalyst obtained a Faraday efficiency for CO production(FECO)of 57.2%at 100 mA·cm^(-2),while the Ag catalyst only obtained a FECO of 42%under the same condition.This study proves that Ni-N-C catalyst can replace Ag in the electrolysis of bicarbonate system to convert bicarbonate into CO.

关 键 词：电化学还原CO_(2) 直接电解碳酸氢盐 催化剂 活性炭 法拉第效率 

分 类 号：TM911.4[电气工程—电力电子与电力传动]