电催化还原CO2反应体系研究进展
Research progress of reaction system for electrochemical CO2 reduction
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摘要: 针对电化学还原CO2反应(CO2ER)过电位较高、转化效率较低、产物选择性较差等问题,对CO2ER催化剂、电解液和电解池的最新研究进展进行综述,指出:现阶段开发的CO2ER催化剂主要包括金属纳米粒子、金属合金、金属氧化物、金属硫化物和金属单原子催化剂,可通过调变催化剂的形貌结构和颗粒尺寸、掺杂元素、引入结构缺陷等方式来提高催化剂的活性、选择性和稳定性;CO2ER体系的电解液主要包括水系电解液、离子液体电解液和有机溶剂电解液,目前应用比较广泛的是水系电解液,但其析氢副反应的发生会使产物选择性受到抑制,而离子液体电解液和有机溶剂电解液中CO2溶解度较大且可抑制析氢副反应的发生,这也是未来的主要应用研究方向;CO2ER用电解池主要包括H型电解池、连续式流动池和MEA反应器,其中MEA反应器是实现CO2电催化转化规模化应用的重要技术手段之一。未来需深入研究催化反应机理,探究其反应活性位点,实现反应催化性能和稳定性的精准调控,同时开发新型电解液和改进电解池设计,以进一步优化反应性能。Abstract: Against issues of the high overpotential, low conversion efficiency, and poor product selectivity of electrochemical CO2 reduction (CO2ER), the research progress of electrocatalysts, electrolytes, and electrolytic cells were reviewed. It was found that the currently developed electrocatalysts contained metal nanoparticles, metal alloy, metal oxides, metal sulfide and single metal atoms. Their catalytic activity, selectivity and stability could be enhanced by adjusting the structure and particle size of electrocatalysts, doping additional elements or introducing structural defects. The electrolyte of CO2ER included aqueous electrolyte, ionic liquid electrolyte and organic electrolyte. At present, the aqueous electrolyte was widely applied, but its selectivity was inhibited by the side hydrogen evolution reaction. The ionic liquid electrolyte and organic electrolyte has high solubility of CO2 and could restrain the hydrogen evolution reaction, which was considered as the main application research direction in the future. The CO2ER can be conducted in H-type cell, continuous flow cell and MEA reactors, among which MEA is one of the important technology to realize the scale application of electrochemical CO2 conversion. In the future, the reaction mechanism should be further studied, and the active sites should be probed to realize the precise control of catalytic performance and stability. Meanwhile, the novel electrolytes should be developed and the design of electrolytic cell should be modified in order to further improve the catalytic performance.
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Key words:
- carbon dioxide /
- electrochemical reduction /
- electrolyte /
- electrolytic cell /
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