Combined high alkalinity and pressurization enable efficient CO2 electroreduction to CO

被引:247
作者
Gabardo, Christine M. [1 ]
Seifitokaldani, Ali [2 ]
Edwards, Jonathan P. [1 ]
Cao-Thang Dinh [2 ]
Burdyny, Thomas [1 ]
Kibria, Md Golam [2 ]
O'Brien, Colin P. [1 ]
Sargent, Edward H. [2 ]
Sinton, David [1 ]
机构
[1] Univ Toronto, Dept Mech & Ind Engn, 5 Kings Coll Rd, Toronto, ON M5S 3G8, Canada
[2] Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
CARBON-DIOXIDE; ELECTROCHEMICAL REDUCTION; OXYGEN EVOLUTION; CATALYTIC PROCESS; HIGH-PRESSURE; INSIGHTS; ELECTROLYSIS; CHALLENGES; ELECTRODES; CONVERSION;
D O I
10.1039/c8ee01684d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The electroreduction of carbon dioxide (CO2) to carbon monoxide (CO) is a promising strategy to utilize CO2 emissions while generating a high value product. Commercial CO2 electroreduction systems will require high current densities (>100 mA cm(-2)) as well as improved energetic efficiencies (EEs), achieved via high CO selectivity and lowered applied potentials. Here we report a silver (Ag)-based system that exhibits the lowest overpotential among CO2-to-CO electrolyzers operating at high current densities, 300 mV at 300 mA cm(-2), with near unity selectivity. We achieve these improvements in voltage efficiency and selectivity via operation in a highly alkaline reaction environment (which decreases overpotentials) and system pressurization (which suppresses the generation of alternative CO2 reduction products), respectively. In addition, we report a new record for the highest half-cell EE (>80%) for CO production at 300 mA cm(-2).
引用
收藏
页码:2531 / 2539
页数:9
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