Rational design of a hollow porous structure for enhancing diffusion kinetics of K ions in edge-nitrogen doped carbon nanorods
作者机构：Institutes of Physical Science and Information TechnologyKey Laboratory of Structure and Functional Regulation of Hybrid MaterialsAnhui UniversityMinistry of EducationHefei 230601China Hefei National Laboratory for Physical Science at Microscale and Department of Materials Science&EngineeringUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Functional Inorganic Material Chemistry of Anhui ProvinceAnhui UniversityHefei 230601China Shanghai Key Laboratory of Materials Protection and Advanced Materials Electric PowerShanghai Engineering Research Center of Energy-Saving in Heat Exchange SystemsShanghai University of Electric PowerShanghai 200090China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2022年第15卷第9期
页 面：8109-8117页
核心收录：
学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：the National Natural Science Foundation of China(Nos.21601003,21972145,22102169,and 52172172) Natural Science Foundation of Anhui Province(No.2108085MB57) China Postdoctoral Science Foundation funded project(No.BH2340000137)
主 题：carbon materials edge-nitrogen hollow structure theoretical calculation batteries
摘 要：The high electrical conductivity makes it possible for one-dimensional(1D)carbon materials to be used as the promising anodes for potassium ion batteries(PIBs),however,the sluggish diffusion kinetics caused by large-sized potassium ions(K^(+))limits their practical applications in energy storage *** this work,hollow carbon nanorods were rationally designed as a case to verify the superiority of 1D hollow structure to improve the diffusion kinetics of K^(+).Simultaneously,edge-N(pyridinic-N and pyrrolic-N)atoms were also introduced into 1D hollow carbon structure,which can provide ample active sites and defects in graphitic lattices to adsorb K^(+),providing extra capacitive storage *** expected,the optimized edge-N doped hollow carbon nanorods(ENHCRs)exhibits a high reversible capacity of 544 mAh·g^(−1)at 0.1 A·g^(−1)after 200 *** at 5 A·g^(−1),it displays a long-term cycling stability with 255 mAh·g^(−1)over 10,000 *** electrochemical measurements confirm that the hollow structure is favorable to improve the transfer kinetics of K^(+)during *** the theoretical calculations demonstrate that edge-N doping can enhance the local electronegativity of graphitic lattices to adsorb much more K^(+),where edge-N doping synergizes with 1D hollow structure to achieve enhanced K^(+)-storage performances.
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