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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

引用

Journal of Energy Chemistry 2023年第11期86卷 135-145,I0004页

作者： Junan Feng Chuan Shi Hanghang Dong Chaoyue Zhang Wendong Liu Yu Liu Tianyi Wang Xiaoxian Zhao Shuangqiang Chen Jianjun Song College of Physics Qingdao UniversityQingdao 266071ShandongChina College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071ShandongChina Department of Chemical Engineering School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuChina Department of Chemistry College of ScienceHebei Agricultural UniversityBaoding 071001HebeiChina

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 ***,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 *** hollow structure in ZIF ensures large inner voids for sulfur and buffering volume *** exposed ZnSe-CoSe heterogeneous interfaces serve as bifunctional adsorption-catalytic centers to accelerate the conversion kinetics and alleviate the shuttle *** 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 *** 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

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