Simultaneous acceleration of sulfur reduction and oxidation on bifunctional electrocatalytic electrodes for quasi-solid-state Zn–S batteries  

作　　者：Mingli Wang Hong Zhang Tianhang Ding Fangjun Wu Lin Fu Bin Song Pengfei Cao Ke Lu 

机构地区：[1]Institutes of Physical Science and Information Technology,School of Materials Science and Engineering,Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education,Anhui University,Hefei 230601,China [2]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [3]School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China [4]School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China [5]Institute of Functional Nano&Soft Materials(FUNSOM),Soochow University,Suzhou 215123,China [6]State Key Lab of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Science China Chemistry》2024年第5期1531-1538,共8页中国科学（化学英文版）

基　　金：financially supported by the Natural Scientific Foundation of China (22109001, 22208335);Postdoctoral Fellowship Program of CPSF (GZB20230950);the Hefei National Laboratory for Physical Sciences at the Microscale (KF2020106);the support provided by the Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)。

摘　　要：The incomplete sulfur reduction and high ZnS re-oxidation energy barrier along with severe side reactions during the battery cycling compromise the practical application of Zn–S electrochemistry. Herein, a bifunctional electrocatalytic sulfur matrix that simultaneously accelerates the sulfur reduction and ZnS oxidation is proposed to realize a highly-efficient Zn–S cell. It is revealed that the N-heteroatom hotspots are more favorable for facilitating the conversion of S to ZnS while the CoO nanocrystal substantially lowers the ZnS activation energy barrier thereby suppressing the formation of disproportionation species(e.g.,SO_(4)^(2-)) and accumulation of inactive ZnS. Accordingly, the Co O anchored on the N-doped carbon-supported sulfur cathode delivers a high Zn^(2+)storage capacity of 1,172 m Ahg^(-1)and outstanding cycling stability with a capacity retention of 71.6% after500 cycles with a high average Coulombic efficiency of 97.8%. Simultaneously, the stable cycling of solid-state Zn–S pouch cells with an energy density of 585 Whkg^(-1)sulfuris also demonstrated. Moreover, the postmortem analysis reveals that the degradation of Zn–S cells is mainly attributed to the limited reversibility of Zn anodes rather than the ZnS decomposition and/or accumulation. The approach to the bidirectional catalysis manipulated the sulfur redox provides a new perspective to realize the theoretical potentials of Zn–S cells.

关 键 词：Zn–S battery bifunctional catalysts solid-state battery sulfur redox degradation mechanism 

分 类 号：TM912[电气工程—电力电子与电力传动] O643.36[理学—物理化学]