Formation of hierarchical Fe7Se8 nanorod bundles with enhanced sodium storage properties  

作　　者：Wenzhi Tian Wenzhe Ma Zhenyu Feng Fang Tian Haibo Li Jing Liu 

机构地区：[1]Key Laboratory of Colloid and interface Chemistry,Ministry of Education,School of Chemistry and Chemical Engineering,and State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,Shandong,China [2]Department of Science and Technology of Shandong Province,Jinan 250100,Shandong,China [3]School of Chemistry and Chemical Engineering,Liaocheng University,Liaocheng 252059,Shandong,China [4]College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,Shandong,China

出　　处：《Journal of Energy Chemistry》2020年第5期97-105,共9页能源化学（英文版）

基　　金：the National Natural Science Foundation of China(21871164);the Natural Science Foundation of Shandong Province(ZR2019MB024);the Taishan Scholar Project of Shandong Province(no.ts201511004).

摘　　要：Ordered hierarchical architectures are attractive candidates for electrochemical energy storage applications.Herein,a facile self-template strategy is applied to prepare Fe7Se8 architectures with a monolithic structure via a self-synthesized single precursor and subsequent calcination at high temperature.With the support of oleylamine,the precursor is structurally targeted to engineer the Fe7Se8 microstructure,featuring nanorod bundles arranged along the longitudinal direction.Because of their ordered hierarchical structure,the Fe7Se8 nanorod bundles deliver a high reversible capacity of 300 m Ah g^-1 at 0.5 A g^-1,along with exceptional rate capability up to 20 A g^-1 and long-term cycle life over 8000 cycles,which represents the highest stability of Fe7Se8 anodes for sodium-ion batteries reported to date.The feasibility of the present strategy to prepare metal selenide structures highlights its promising potential for the rational and effective engineering of electrode materials responsible for the electrochemical performance of energy storage systems.Ordered hierarchical architectures are attractive candidates for electrochemical energy storage applications. Herein, a facile self-template strategy is applied to prepare Fe7Se8 architectures with a monolithic structure via a self-synthesized single precursor and subsequent calcination at high temperature. With the support of oleylamine, the precursor is structurally targeted to engineer the Fe7Se8 microstructure,featuring nanorod bundles arranged along the longitudinal direction. Because of their ordered hierarchical structure, the Fe7Se8 nanorod bundles deliver a high reversible capacity of 300 m Ah g-1 at 0.5 A g-1,along with exceptional rate capability up to 20 A g-1 and long-term cycle life over 8000 cycles, which represents the highest stability of Fe7Se8 anodes for sodium-ion batteries reported to date. The feasibility of the present strategy to prepare metal selenide structures highlights its promising potential for the rational and effective engineering of electrode materials responsible for the electrochemical performance of energy storage systems.

关 键 词：Fe7Se8 HIERARCHICAL structure Nanorod BUNDLES Sodium-ion BATTERIES OLEYLAMINE 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]