化工学报 ›› 2023, Vol. 74 ›› Issue (11): 4570-4577.DOI: 10.11949/0438-1157.20230813

• 催化、动力学与反应器 • 上一篇    下一篇

活性炭负载Ni-N-C催化剂提升电解碳酸氢盐法拉第效率

王正峰1(), 谢雨杭2,3, 范永春1, 李伟科1, 付乾2,3()   

  1. 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
  • 收稿日期:2023-08-08 修回日期:2023-10-31 出版日期:2023-11-25 发布日期:2024-01-22
  • 通讯作者: 付乾
  • 作者简介:王正峰(1983—),男,高级工程师,wangzhengfeng@gedi.com.cn
  • 基金资助:
    重庆市杰出青年科学基金项目(cstc2019jcyjjqX0020)

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

Zhengfeng WANG1(), Yuhang XIE2,3, Yongchun FAN1, Weike LI1, Qian FU2,3()   

  1. 1.China Energy Engineering Group Guangdong Electric Power Design Institute, Guangzhou 510633, Guangdong, China
    2.Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China
    3.Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China
  • Received:2023-08-08 Revised:2023-10-31 Online:2023-11-25 Published:2024-01-22
  • Contact: Qian FU

摘要:

直接电解碳酸氢盐可避免CO2解吸的高耗能步骤,为将CO2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N2饱和的3.0 mol·L-1 KHCO3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。

关键词: 电化学还原CO2, 直接电解碳酸氢盐, 催化剂, 活性炭, 法拉第效率

Abstract:

Direct electrolytic bicarbonate can avoid the energy-intensive step of CO2 desorption, thus offering a promising route to convert CO2 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 N2-saturated 3.0 mol·L-1 KHCO3 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.

Key words: electrochemical reduction of CO2, direct electrolytic bicarbonate, catalyst, active carbon, Faraday efficiency

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