A High-Performance Continuous-Flow MEA Reactor for A High-Performance Continuous-Flow MEA Reactor for Electroreduction CO Electroreduction CO 22 to Formate to Formate

electrocata-Abstract: The electrochemical carbon dioxide reduction reaction (CO 2 RR) is a promising approach to produce liquid fuels and industrial chemicals by utilizing intermittent renewable electricity for mitigating environmental problems. However, the traditional H-type reactor seriously limits the electrochemical performance of CO 2 RR due to the low CO 2 solubility in electrolyte, and high ohmic resistance caused by the large distance between two electrodes, which is unbeneficial for industrial application. Herein, we demonstrated a high-performance continuous flow membranes electrode assembly (MEA) reactor based on a self-growing Cu/Sn bimetallic electrocatalyst in 0.5 mol 窑 L -1 KHCO 3 for converting CO 2 to formate. Compared with an H-type cell, the MEA reactor not only shows the excellent current density (66.41 mA 窑 cm -2 at -1.11 V RHE ), but also maintains high Faraday efficiency of formate (89.56% ) with the steady work around 20 h. Notably, we also designed the new CO 2 RR system to effectively separate the gaseous/liquid production. Surprisingly, the production rate of formate reached 163 滋 mol 窑 h -1 窑 cm -2 at -0.91 V RHE with the cell voltage of 3.17 V. This study provides a promising path to overcome mass transport limitations of the electrochemical CO 2 RR and to separate liquid from gas products.

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