CIESC Journal ›› 2023, Vol. 74 ›› Issue (1): 313-329.DOI: 10.11949/0438-1157.20221268

• Reviews and monographs • Previous Articles     Next Articles

Research progress and tendency of CO2 electrocatalytic reduction to syngas

Xin LI1,2(), Shaojuan ZENG2, Kuilin PENG2, Lei YUAN2,3, Xiangping ZHANG1,2()   

  1. 1.Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450003, Henan, China
    2.Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
    3.Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
  • Received:2022-09-21 Revised:2022-11-28 Online:2023-03-20 Published:2023-01-05
  • Contact: Xiangping ZHANG

CO2电催化还原制合成气研究进展及趋势

李鑫1,2(), 曾少娟2, 彭奎霖2, 袁磊2,3, 张香平1,2()   

  1. 1.郑州大学,河南先进技术研究院,河南 郑州 450003
    2.中国科学院过程工程研究所,多相复杂系统国家重点实验室,离子液体清洁过程北京市重点实验室,北京 100190
    3.郑州大学化工学院,先进功能材料制造教育部工程研究中心,河南 郑州 450001
  • 通讯作者: 张香平
  • 作者简介:李鑫(1996—),男,硕士研究生,lixin21@ipe.ac.cn
  • 基金资助:
    国家重点研发计划项目(2020YFA0710200);国家自然科学基金项目(21890764);山西省科技重大专项项目(20201102005);中国科学院青年创新促进会项目(2018064)

Abstract:

Renewable electric energy drives CO2 electrocatalytic synthesis of chemicals or fuels, which has the advantages of mild reaction conditions, adjustable product selectivity and the use of distributed renewable energy. Syngas, as an important chemical raw gas, can be used to produce methanol, ethanol, olefins and other bulk chemicals, thus CO2 electrocatalytic reduction to syngas is one of important ways to CO2 utilization. However, accurately controlling the CO/H2 ratio with high current density and high selectivity is one of the key scientific problems. In this paper, from the perspective of improving current density and efficiency, and widening the proportion of syngas, we reviewed the latest research progress of CO2 electrocatalytic reduction to syngas, including electrode design, electrolyte development, and electrolyzer structure innovation, and so on. Then, the research progress on the electrocatalytic reduction mechanism of CO2 electrocatalytic reduction to syngas by in-situ characterization and theoretical simulation (DFT, MD) is discussed. Furthermore, it was concluded that the efficiency of CO2 electrocatalytic reduction to syngas can be improved through multi-stage morphology regulation of catalyst, multi-active site design, integration of CO2 capture and conversion system, and the coupling of CO2 reduction and anodic reaction. Finally, the challenges of the industrialization of CO2 electrocatalytic reduction to syngas are discussed and prospected.

Key words: CO2, syngas, electrocatalytic reduction, catalyst, electrolytes, mechanism

摘要:

可再生电能驱动CO2电催化合成化学品或燃料,具有反应条件温和、产物选择性可调且可利用分布式可再生能源优势。合成气作为一类重要的化工原料气,可制备甲醇、乙醇、烯烃等大宗化学品,是CO2电催化转化的重要途径,如何高电流密度、高选择性且精准调控碳氢比例(CO/H2)是需要解决的关键科学技术难题。本文从提升电流密度和效率、拓宽合成气比例角度出发,综述了CO2电催化还原制合成气的最新研究进展,包括电极材料设计、电解液开发、电解槽结构创新等;论述了利用原位表征和理论模拟(DFT、MD)方法对CO2电催化还原制合成气反应机理的研究进展。在此基础上,提出可通过催化剂多级形貌调控、多活性位点设计、CO2捕集与转化系统集成、CO2还原与阳极反应耦合等途径,提升CO2电催化还原制合成气效率的策略。最后,探讨和展望了实现CO2电催化还原制合成气工业化的挑战和问题。

关键词: 二氧化碳, 合成气, 电催化还原, 催化剂, 电解液, 机理

CLC Number: