首页|Biomass-derived porous carbon with single-atomic cobalt toward high-performance aqueous zinc-sulfur batteries at room temperature
Biomass-derived porous carbon with single-atomic cobalt toward high-performance aqueous zinc-sulfur batteries at room temperature
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Aqueous zinc-sulfur batteries at room temperature hold great potential for next-generation energy stor-age technology due to their low cost,safety and high energy density.However,slow reaction kinetics and high activation energy at the sulfur cathode pose great challenges for the practical applications.Herein,biomass-derived carbon with single-atomic cobalt sites(MMPC-Co)is synthesized as the cathode in Zn-S batteries.The catalysis of single-atom Co sites greatly promotes the transform of cathode electrolyte interface(CEI)on the cathode surface,while offering accelerated charge transfer rate for high conversion reversibility and large electrochemical surface area(ECSA)for high electrocatalytic current.Furthermore,the rich pore structure not only physically limits sulfur loss,but also accelerates the transport of zinc ions.In addition,the large pore volume of MMPC-Co is able to relieve the stress effect caused by the volume expansion of ZnS during charge/discharge cycles,thereby maintaining the stability of electrode structure.Consequently,the sulfur cathode maintains a high specific capacity of 729.96 mA h g-1 after 500 cycles at 4 A g-1,which is much better than most cathode materials reported in the literature.This work provides new insights into the design and development of room-temperature aqueous Zn-S batteries.
Shenfei Zhao、Xiaoshuai Wu、Jiliang Zhang、Chunjie Li、Zixiang Cui、Weihua Hu、Ruguang Ma、Changming Li
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Institute for Clean Energy & Advanced Materials,School of Materials & Energy,Southwest University,Chongqing 400715,China
Institute for Materials Science and Devices,School of Materials Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China
School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,Liaoning,China
National Natural Science Foundation of China,China
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