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A carbon-efficient bicarbonate electrolyzer
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DOI：10.1016/j.xcrp.2023.101662.png)
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Carbon efficiency is one of the most pressing problems of carbon dioxide electroreduction today. While there have been studies on anion exchange membrane electrolyzers with carbon dioxide (gas) and bipolar membrane electrolyzers with bicarbonate (aqueous) feedstocks, both suffer from low carbon efficiency. In anion exchange membrane electrolyzers, this is due to carbonate anion crossover, whereas in bipolar membrane electrolyzers, the exsolution of carbon dioxide (gas) from the bicarbonate solution is the culprit. Here, we first elucidate the root cause of the low carbon efficiency of liquid bicarbonate electrolyzers with thermodynamic calculations and then achieve carbon-efficient carbon dioxide electroreduction by adopting a near-neutral-pH cation exchange membrane, a glass fiber intermediate layer, and carbon dioxide (gas) partial pressure management. We convert highly concentrated bicarbonate solution to solid formate fuel with a yield (carbon efficiency) of greater than 96%. A device test is demonstrated at 100 mA cm -2 with a full-cell voltage of 3.1 V for over 200 h.
Keyword:
CO2 ELECTROREDUCTION
CONVERSION
REDUCTION
DIOXIDE
FORMATE
CATALYSIS
DESIGN
期刊
IF:
7.3
论文数:
2.8K
被引数:
1.2W
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分享收藏Conversion of Bicarbonate to Formate in an Electrochemical Flow Reactor在电化学流动反应器中将碳酸氢盐转化为甲酸盐.png)
ACS ENERGY LETTERS
ACS ENERGY LETTERSIF18.2
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