期刊
JOURNAL OF POWER SOURCES
卷 378, 期 -, 页码 555-561出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.12.078
关键词
CO2 reduction; Organic media; Zn electrode; X-ray photoelectron spectroscopy
资金
- National Natural Science Foundation of China (NSFC) [51164020, 51062009]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars
- Analysis and Testing Foundation of Kunming University of Science and Technology [20152102004, 20060130]
- Free Exploration Fund for Academician of Chinese Academy of Engineering in Yunnan [2017HA006]
Developing low cost and high efficient electrode for carbon dioxide (CO2) reduction in organic media is essential for practical application. Zn is a cheap metal and has high catalytic effects on CO2 reduction to carbon monoxide (CO) in aqueous solution. However, little attention has been given to investigate the performance of Zn in organic media for CO2 reduction. In present work, we have conducted CO2 reduction in propylene carbonate/tetrabutylammonium perchlorate on Zn due to that propylene carbonate is a widely used industrial absorber, and tetrabutylammonium perchlorate is a commonly used organic supporting electrolyte. In addition, because electrochemical reduction of CO2 to CO naturally produces H2O, we have discussed water effects on CO2 reduction in propylene carbonate/tetrabutylammonium perchlorate + 6.8 wt % H2O. Our experiment results reveal that the faradaic efficiency for CO formation reaches to 83%, and the current density remains stable at 6.72 mA/cm(2) at voltage -2.3 V for 4 h. Interestingly, Zn presents higher catalytic activity than Ag, and slightly lower than Au. X-ray photoelectron spectroscopy results confirm that no poisonous species is formed and absorbed on the cathode, which is an important advantage in practical application.
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