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Advanced functional materials: Construction of highly efficient electrocatalytic carbon dioxide cracking catalyst based on edge sulfur structure regulation

wallpapers Business 2020-10-04 >
Electrochemical carbon dioxide (CO2) decomposition of

in aqueous medium is an effective way to realize the artificial conversion of CO2 to high value-added compounds under environmental conditions. However the kinetics of the two a half reactions of CO2 cracking such as the cathodic CO2 reduction reaction (co2rr) the anodic oxygen evolution reaction (OER) is slow efficient catalysts are needed to accelerate the two reactions. It is worth noting that the development of bifunctional co2rr / oer electrocatalyst is more attractive than the single function electrocatalyst which studies co2rr oer separately because bifunctional co2rr / oer electrocatalyst can simplify CO2 cracking unit improve catalyst utilization. However only a few of these catalysts are highly efficient for the preparation of oerr at the same time.

Professor He Chuanxin School of chemistry environmental engineering Shenzhen University the research group aiming at the bottleneck of the above-mentioned CO2 total pyrolysis reaction synthesized cobalt disulfide (Cos2) nanocages with multi-level structure (such as the three-dimensional hollow Cos2 nanocage network on the two-dimensional Cos2 nanosheets array) as efficient CO2 total pyrolysis catalyst using cobalt hydroxide nanosheets array as template. It is found that the edge sulfur can be partially removed by calcining at 300 OC in argon atmosphere thus inhibiting the side reaction of hydrogen evolution (her). DFT calculation shows that the planar sulfur of Cos2 has high co2rr activity but low her activity which is an ideal co2rr active site. A series of experimental results show that the multi-stage Cos2 nano cage with less edge sulfur has a strong inhibitory effect on her which significantly promotes the formation of CO from co2rr its Faraday efficiency can be increased to 85.7%. Electrochemical tests show that the multi-stage nanocages have the common structural advantages derived from three-dimensional nanocages two-dimensional nanosheets which expose more active sites effectively enhance the mass / charge transfer resulting in high co2rr oer activities. It is impressive that the three-dimensional nano cage can be used as both cathode anode catalyst for complete CO2 pyrolysis. In a nearly neutral electrolyte the current density of 1 Ma cm-2 at 1.92 V is the best reported co2rr full cracking catalyst.


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