典型文献
Competing reduction induced homogeneous oxygen doping to unlock MoS2 basal planes for faster polysulfides conversion
文献摘要：
The parasitic polysulfides shuttle effect greatly hinders the practical application of lithium sulfur batter-ies,and this issue can be addressed by promoting polysulfides conversion with catalytic materials such as MoS2.However,the catalytic activity of MoS2 mainly relies on edge sites,but is limited by inert basal planes.We herein report a novel,facile,ethylene glycol enabled competing reduction strategy to dope MoS2 homogeneously with oxygen atoms so that its inert basal planes can be unlocked.Ethylene glycol works as a reducing agent and competes with thiourea to react with ammonium molybdate,leading to insufficient sulfuration of Mo,and consequent formation of O-MoS2.Our theoretical and experimental investigations indicate that the homogeneously distributed 0 dopants can create abundant adsorption/-catalytic sites in the MoS2 basal planes,enlarge the inter-plane distance to promote ion transport,and thus enhance the catalytic conversion of polysulfides.The oxygen doped MoS2(O-MoS2)is supported on carbon nanosheets(CNS)and the composite(O-MoS2/CNS)is employed to modify the separator of Li-S battery.It gives the battery an initial discharge capacity of 1537 mAh g-1 at 0.2 C,and the battery retains a discharge capacity of 545 mAh g-1 after ultra-long 2000 cycles at 1 C,corresponding to a very small cyclic decay rate of 0.0237％.Even under a raising sulfur loading of 8.2 mg cm-2,the Li-S battery also delivers a high discharge capacity(554 mAh g-1)with outstanding cycle stability(84.6％capacity retention)after 100 cycles at 0.5 C.Our work provides a novel,facile approach to fabricate highly catalyt-ically active oxygen-doped MoS2 for advanced Li-S batteries.
文献关键词：
中图分类号：
作者姓名：
Da Lei;Wenzhe Shang;Xu Zhang;Yongpeng Li;Xiaoshan Shi;Shaoming Qiao;Qian Wang;Qiang Zhang;Ce Hao;Hui Xu;Guohua Chen;Gaohong He;Fengxiang Zhang
作者机构：
State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,Liaoning,China;School of Chemical Engineering,Dalian University of Technology,Panjin 124221,Liaoning,China;Shenzhen ApogeeTec Greenergy Co.Ltd.,Shenzhen 518000,Guangdong,China;Department of Mechanical Engineering,Research Institute for Smart Energy,The Hong Kong Polytechnic University,Kowloon,Hong Kong 999077,China
文献出处：
引用格式：
[1]Da Lei;Wenzhe Shang;Xu Zhang;Yongpeng Li;Xiaoshan Shi;Shaoming Qiao;Qian Wang;Qiang Zhang;Ce Hao;Hui Xu;Guohua Chen;Gaohong He;Fengxiang Zhang-.Competing reduction induced homogeneous oxygen doping to unlock MoS2 basal planes for faster polysulfides conversion)[J].能源化学,2022(10):26-34
A类：
dope,molybdate,catalyt
B类：
Competing,reduction,induced,oxygen,doping,MoS2,basal,planes,faster,polysulfides,conversion,parasitic,shuttle,effect,greatly,hinders,practical,application,lithium,this,issue,can,be,addressed,by,promoting,catalytic,materials,such,However,activity,mainly,relies,edge,sites,limited,inert,We,herein,report,novel,facile,ethylene,glycol,enabled,competing,strategy,homogeneously,atoms,that,its,unlocked,Ethylene,works,reducing,agent,competes,thiourea,react,ammonium,leading,insufficient,sulfuration,consequent,formation,Our,theoretical,experimental,investigations,indicate,distributed,dopants,create,abundant,adsorption,enlarge,inter,distance,promote,transport,thus,enhance,doped,supported,carbon,nanosheets,CNS,composite,employed,modify,separator,Li,battery,It,gives,initial,discharge,capacity,mAh,retains,after,ultra,long,cycles,corresponding,very,small,cyclic,decay,Even,under,raising,loading,also,delivers,outstanding,stability,retention,provides,approach,fabricate,highly,ically,active,advanced,batteries
AB值：
0.552589
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