CO 2 electrolysis at industrial current densities using anion exchange membrane based electrolyzers
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tps://doi.org/10.1007/s11426-020-9825-9
SPECIAL TOPIC: Photocatalytic or Electrocatalytic Reduction of CO2
CO2 electrolysis at industrial current densities using anion exchange membrane based electrolyzers 1,2
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Pengfei Wei , Hefei Li , Long Lin , Dunfeng Gao , Xiaomin Zhang , Huimin Gong , 1 1 1* 1 Guangyan Qing , Rui Cai , Guoxiong Wang & Xinhe Bao 1
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, 2
Chinese Academy of Sciences, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China
Received June 19, 2020; accepted July 11, 2020; published online August 25, 2020
Significant progress on electrocatalytic CO2 reduction reaction (CO2RR) has been achieved in recent years. However, the research and development of electrolyzer device for CO2RR is scarce. Here we use anion exchange membrane to develop zerogap electrolyzers for CO2RR. The electrochemical properties of the electrolyzers with Pd/C and Cu cathodes are investigated. −2 The Pd/C cathode shows a current density of 200 mA cm with CO Faradaic efficiency of 98% and energy efficiency of 48.8%, −2 while the Cu cathode shows a current density of 350 mA cm with total CO2RR Faradaic efficiency of 81.9% and energy efficiency of 30.5%. This work provides a promising demonstration of CO2 electrolyzer using anion exchange membrane for CO2 electrolysis at industrial current densities. CO2 electrolysis, electrolyzer, industrial current density, anion exchange membrane, energy efficiency, Pd/C catalyst, Cu catalyst Citation:
Wei P, Li H, Lin L, Gao D, Zhang X, Gong H, Qing G, Cai R, Wang G, Bao X. CO2 electrolysis at industrial current densities using anion exchange membrane based electrolyzers. Sci China Chem, 2020, 63, https://doi.org/10.1007/s11426-020-9825-9
Electrocatalytic CO2 reduction reaction (CO2RR) that converts CO2 and H2O to useful chemicals and feedstock is a promising route to address the conversion and utilization of CO2 as well as the storage of renewable energy simultaneously [1]. In recent years, many efforts have been devoted to designing efficient catalysts in order to reduce the overpotential and improve the Faradaic efficiency and current density of CO2RR. Significant progress has been achieved for catalyzing CO2RR to CO, formate, ethylene, ethanol and other hydrocarbons/oxygenates [2–11]. However, most electrochemical results are usually acquired in H-type cells, and the current density of CO2RR is limited by low solubility of CO2 in aqueous solutions and only reaches a few tens of −2 mA cm [12]. Flow cells can improve the current density of *Corresponding authors (email: [email protected]; [email protected])
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CO2RR up to a few hundred of mA cm even A cm by constructing the three-phase boundary of CO2 gas/liquid electrolyte/solid catalyst in gas diffusion electrode configuration, however, the liquid electrolyte between cathode and anode causes a huge voltage drop and a low energy efficiency due to a large ohmic loss [13].
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