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Gas–liquid–solid reaction system for CO 2 electroreduction to formate without using supporting electrolyte
Author(s) -
DíazSainz Guillermo,
AlvarezGuerra Manuel,
SollaGullón José,
GarcíaCruz Leticia,
Montiel Vicente,
Irabien Angel
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16299
Subject(s) - formate , electrolyte , faraday efficiency , electrochemistry , cathode , catalysis , chemistry , electrode , inorganic chemistry , chemical engineering , organic chemistry , engineering
The use of bismuth‐based catalysts is promising for formate production by the electroreduction of CO 2 captured from waste streams. However, compared to the extensive research on catalysts, only a few studies have focused on electrochemical reactor performance. Hence, this work studied a continuous‐mode gas–liquid–solid reaction system for investigating CO 2 electroreduction to formate using Bi‐catalyst‐coated membrane electrodes as cathodes. The experimental setup was designed to analyze products obtained in both liquid and gas phases. The influence of relevant variables (e.g., temperature and input water flow) was analyzed, with the thickness of the liquid film formed over the cathode surface being a key parameter affecting system performance. Promising results, including a high formate concentration of 34 g/L with faradaic efficiency for formate of 72%, were achieved.