Phase reconfiguration of heterogeneous CoFeS/CoNiS nanoparticles for superior battery-type supercapacitors  

作　　者：Lina Ma Fan Li Min Zhou Jidong Dong Hao Luo Wei Zhang Wenchao Zhao Xinliang Li Zaixing Jiang Yudong Huang 

机构地区：[1]College of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,Shandong,China [2]School of Materials Science and Engineering,Xiamen University of Technology,Xiamen 361024,Fujian,China [3]Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,Jiangus,China [4]Key Laboratory of Material Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,Henan,China [5]MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,State Key Laboratory of Urban Water Resource and Environment,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China [6]Material Science and Engineering College,Northeast Forestry University,Harbin 150040,Heilongjiang,China

出　　处：《Journal of Energy Chemistry》2024年第9期217-225,共9页能源化学（英文版）

基　　金：financial support from the Chang Jiang Scholars Program (51073047);the National Natural Science Foundation of China (51773049);the China Aerospace Science and Technology Corporation-Harbin Institute of Technology Joint Center for Technology Innovation Fund (HIT15-1A01);the Harbin City Science and Technology Projects (2013DB4BP031 and RC2014QN017035);the Natural Science Foundation of Shandong Province of China (ZR2023QE071);the College Students’ Innovation and Entrepreneurship Training Program Projects of Shandong Province (S202211065048);the Scientific Research Foundation of Qingdao University (DC1900009425);the China Postdoctoral Science Foundation (2022TQ0282)

摘　　要：Developing advanced battery-type materials with abundant active sites,high conductivity,versatile morphologies,and hierarchically porous structures is crucial for realizing high-quality hybrid supercapacitors.Herein,heterogeneous FeS@NiS is synthesized by cationic Co doping via surface-structure engineering.The density functional theory(DFT)theoretical calculations are firstly performed to predict the advantages of Co dopant by improving the OH^(−)adsorption properties and adjusting electronic structure,benefiting ions/electron transfer.The dynamic surface evolution is further explored which demonstrates that CoFeS@CoNiS could be quickly reconstructed to Ni(Co)Fe_(2)O_(4)during the charging process,while the unstable structure of the amorphous Ni(Co)Fe_(2)O_(4)results in partial conversion to Ni/Co/FeOOH at high potentials,which contributes to the more reactive active site and good structural stability.Thus,the free-standing electrode reveals excellent electrochemical performance with a superior capacity(335.6 mA h g^(−1),2684 F g^(−1))at 3 A g^(−1).Furthermore,the as-fabricated device shows a quality energy density of 78.1 W h kg^(−1)at a power density of 750 W kg^(−1)and excellent cycle life of 92.1%capacitance retention after 5000 cycles.This work offers a facile strategy to construct versatile morphological structures using electrochemical activation and holds promising applications in energy-related fields.

关 键 词：In-situ reconfiguration Heterogeneous design Battery-type supercapacitors Superior performance Sulphide 

分 类 号：TM53[电气工程—电器] TB383.1[一般工业技术—材料科学与工程]