Design of ZnSe-CoSe heterostructure decorated in hollow N-doped carbon nanocage with generous adsorption and catalysis sites for the reversibly fast kinetics of polysulfide conversion  

作　　者：Junan Feng Chuan Shi Hanghang Dong Chaoyue Zhang Wendong Liu Yu Liu Tianyi Wang Xiaoxian Zhao Shuangqiang Chen Jianjun Song 

机构地区：[1]College of Physics,Qingdao University,Qingdao 266071,Shandong,China [2]College of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,Shandong,China [3]Department of Chemical Engineering,School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China [4]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,Jiangsu,China [5]Department of Chemistry,College of Science,Hebei Agricultural University,Baoding 071001,Hebei,China

出　　处：《Journal of Energy Chemistry》2023年第11期135-145,I0004,共12页能源化学(英文版)

基　　金：financially supported by the Natural Science Foundation of Shandong Province,China(ZR2021QE192);the National Natural Science Foundation of China(21975154,22179078);the Postdoctoral Science Foundation of China(2018M63074);Qingdao Post-doctoral Applied Research Project(QDBSH20220202040)。

摘　　要：Although lithium-sulfur batteries(Li SBs)are regarded as one of the most promising candidates for the next-generation energy storage system,the actual industrial application is hindered by the sluggish solid–liquid phase conversion kinetics,severe shuttle effect,and low sulfur loadings.Herein,a zeolitic imidazolate framework(ZIF)derived heterogeneous ZnSe-CoSe nanoparticles encapsulated in hollow N-doped carbon nanocage(ZnSe-CoSe-HNC)was designed by etching with tannic acid as a multifunctional electrocatalyst to boost the polysulfide conversion kinetics in LiSBs.The hollow structure in ZIF ensures large inner voids for sulfur and buffering volume expansions.Abundant exposed ZnSe-CoSe heterogeneous interfaces serve as bifunctional adsorption-catalytic centers to accelerate the conversion kinetics and alleviate the shuttle effect.Together with the highly conductive framework,the ZnSe-CoSeHNC/S cathode exhibits a high initial reversible capacity of 1305.3 m A h g-1at 0.2 C,high-rate capability,and reliable cycling stability under high sulfur loading and lean electrolyte(maintaining at 745 m A h g-1after 200 cycles with a high sulfur loading of 6.4 mg cm-2and a low electrolyte/sulfur ratio of 6μL mg^(-1)).Theoretical calculations have demonstrated the heterostructures of ZnSe-CoSe offer higher binding energy to lithium polysulfides than that of ZnSe or CoSe,facilitating the electron transfer to lithium polysulfides.This work provides a novel heterostructure with superior catalytic ability and hollow conductive architecture,paving the way for the practical application of functional sulfur electrodes.

关 键 词：Lithium-sulfur batteries HETEROSTRUCTURE Conversion Kinetics Hollow structure Bi-directional catalysis 

分 类 号：O643.36[理学—物理化学] TB383.1[理学—化学]