Electrochemical CO2 reduction using alkaline membrane electrode assembly on various metal electrodes

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Electrochemical CO2 reduction reaction (CO2RR) has received much attention as a promising technology to reduce CO2 using renewable electricity, but it typically suffers from low CO2 solubility in aqueous phase and a high cell resistance of a conventional liquid phase reactor. Here, we report the CO2RR using a membrane electrode assembly that consists of gas diffusion electrode (GDE) and anion exchange membrane (AEM). The GDE enabled facile mass transfer of gaseous CO2 directly to the catalyst and the AEM could suppress hydrogen evolution reaction (HER) by increasing local pH at the catalyst. Various metal powders of Pd, Ag, Zn, Cu, Sn, Ru, Pt, Ni were tested as cathode catalysts. Pd and Ag showed high current density of > 200 mA cm(-2) at -3.0 V and faradaic efficiency > 95% for CO production with a low cell resistance of < 0.150 m Omega. Whereas a small amount of Pd black or Ag powder showed lower selectivity for CO production with more HER, using Pd/C or Ag/C at the same metal content could enhance the CO selectivity with better durability. The CO productivity could be maximized by changing CO2 flow rate, and it was comparable to the values obtained from gas-phase CO2 reduction.
Publisher
ELSEVIER SCI LTD
Issue Date
2019-05
Language
English
Article Type
Article
Citation

JOURNAL OF CO2 UTILIZATION, v.31, pp.244 - 250

ISSN
2212-9820
DOI
10.1016/j.jcou.2019.03.022
URI
http://hdl.handle.net/10203/261815
Appears in Collection
CBE-Journal Papers(저널논문)
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