Pressure dependence of electrochemical CO2 reduction to ethanol in flow cell

Wang，Xiaowen1; Ma，Fei2,3; Wei，Haiqiao1,2; Li，Wenjia4; Zhao，Jun2,3; Yang，Xiaotao1

2024-09-01

10.1016/j.jpowsour.2024.234846

Journal of Power Sources   影响因子和分区

0378-7753

The electroreduction of carbon dioxide (CORR) to ethanol is an ideal approach for using released CO and producing fuel. The impact of CO partial pressure (P) on ethanol synthesis was significant but was not well understood. The present study investigates the pressure dependence of ethanol formation from 0.25 bar to 15 bar in a high-pressure flow cell. It displayed a volcano type. The P associated with the peak Faradaic efficiency (FE) of ethanol increased as the current density increased. The pressure peak values were 0.5 bar, 0.75 bar at 100, 200, and 300 mA cm, respectively. Ethanol formation kinetics was affected by adsorbate-adsorbate interactions and the physical blocking of active sites on catalysts with excess CO. Besides, ethanol synthesis using the configured flue gas, i.e., low-concentration CO (V = 5–30%), was realized via system pressurization from 5 to 20 bar at 200 mA cm. By optimizing the combination of CO concentration and total pressure (P), the fuel efficiency (FE) of ethanol was maximized to 26.5%. This study uncovers the ideal CO partial pressure for ethanol synthesis under industrial current densities, hence presenting potential industrial applications for utilizing flue gas directly in ethanol production.

CO2RR Ethanol Flow cell High pressure

SCI ; EI

英语

其他

20242316211891

Carbon dioxide ; Catalyst activity ; Efficiency ; Electrolytic reduction ; Flue gases ; Flues

Air Pollution Sources:451.1 ; Ore Treatment:533.1 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Production Engineering:913.1

MATERIALS SCIENCE

2-s2.0-85195036238

Scopus

1.State Key Laboratory of Engines,Tianjin University,Tianjin,300071,China
2.National Industry-Education Platform of Energy Storage,Tianjin University,Tianjin,300072,China
3.Key Laboratory of Efficient Utilization of Low and Medium Grade Energy,Tianjin University,Tianjin,300071,China
4.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Xiaowen,Ma，Fei,Wei，Haiqiao,et al. Pressure dependence of electrochemical CO2 reduction to ethanol in flow cell[J]. Journal of Power Sources,2024,613.

Wang，Xiaowen,Ma，Fei,Wei，Haiqiao,Li，Wenjia,Zhao，Jun,&Yang，Xiaotao.(2024).Pressure dependence of electrochemical CO2 reduction to ethanol in flow cell.Journal of Power Sources,613.

Wang，Xiaowen,et al."Pressure dependence of electrochemical CO2 reduction to ethanol in flow cell".Journal of Power Sources 613(2024).