期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 285, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.120350
关键词
Sacrificial zinc electrode; dendritic Ag-Cu electrode; Spontaneous CO2 reduction
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2021R1A4A1024129]
- Korea Electric Power Corpora-tion [R21XO01-19]
CO2 is both a greenhouse gas causing global warming and a sustainable carbon feedstock. In this study, a gaseous CO2 reduction system using electrochemical CO2 reduction was designed and operated spontaneously, achieving the objective of converting CO2 into value-added compounds.
Carbon dioxide (CO2) has been considered as a green-house gas that causes environmental problems of global warming. On the other hand, the CO2 is a sustainable carbon feedstock, which can be used for the production of value-added products. With rising levels of CO2 in atmosphere, methods capable of converting CO2 into value-added products have become more important. Among several methods, the electrochemical CO2 reduction has attracted much interest because it can alter CO2 to other useful compounds even at relatively low temperatures. In most previous works, the electrochemical reduction of CO2 has occurred only when the cathodic overpotential has been applied in aqueous electrolyte system. In such a system, the continuous electric power has to be supplied and the amount of CO2 delivery has been also limited. In this work, we have designed the gaseous CO2 reduction system using sacrificial zinc anode and dendritic silver-copper cathode. Considering that the standard reduction potential of zinc is further negative than that of CO2, the system has been operated spontaneously, in which the Zn electrode is readily oxidized to Zn(OH)(4)(2 & nbsp;)ion and gaseous CO2 is reduced. During the spontaneous operation of the system, the power density of 14.97 mW/cm(2) has been obtained with the production of carbon monoxide and hydrocarbons such as CH4, C2H4, and C2H2.
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