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Advanced energy materials: the heart has a soul, zinc is easy to use: liquid zinc cathode helps carbon dioxide reduction

wallpapers News 2020-08-26
The

molten salt electrochemical process based on the mechanism of oxide dissolution electrodeposition not only supports the industrial preparation of non-ferrous metals (such as electrolytic aluminum) but also provides a way to fix carbon dioxide. The results show that the flue gas of molten salt has strong absorption capacity no need of carbon dioxide separation enrichment in advance the carbon fixation process is short; the electrochemical window of molten salt is large the side reaction is less the carbon fixation current efficiency is high; the reaction kinetics is fast at high temperature no complex or precious metal catalyst is needed so it is suitable for high-throughput carbon fixation. The key to promote the application of this method is to improve the energy efficiency of molten salt electrochemical carbon fixation the added value of carbon fixation products.

Xiao Wei research group of Wuhan University used liquid zinc cathode as the reaction interface of carbon dioxide electroreduction in molten salt. Through the coupling mechanism of metal thermal reduction electrochemical reduction the electroreduction process of carbon dioxide was strengthened the zinc carbon core-shell material was constructed. Carbon dioxide is captured by molten salt transformed into carbonate. The dynamic evolution of liquid-liquid interface of liquid zinc / carbonate shows that the coupling of metal zinc reduction electrochemical reduction occurs that is liquid zinc thermal reduction transforms carbonate into solid zinc oxide then solid zinc oxide carbonate are electrochemically reduced together to form zinc carbon core-shell structure. On the one h liquid zinc can be used as depolarizer for carbon dioxide reduction which improves the energy efficiency of carbon fixation; compared with solid cathode the current efficiency of carbon fixation with liquid zinc cathode increases from 75% to 90%. On the other h liquid zinc can also be used as a soft template to induce the formation of zinc carbon core-shell structure realizing the template free preparation of carbon shell from carbon dioxide which provides a new idea for the controllable preparation of advanced carbon materials. The above results were published in "advanced energy materials"( DOI:10.1002/aenm.202002241 )。

can efficiently convert carbon dioxide into advanced energy materials which is one of the ways to improve the economy of carbon neutrality carbon sequestration process. We believe that the reasonable design of the interface process of molten salt electrochemical reaction can provide new ideas for improving the efficiency of carbon reduction reaction high value utilization of bulk metals.


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