花状Zn_(0.76)Co_(0.24)S纳米材料的制备及电化学性能研究  

Synthesis and Electrochemical Performance of Flower-like Zn_(0.76)Co_(0.24)S

作　　者：方林霞[1] 兰梦迪 刘冰 曹悦 FANG Linxia;LAN Mengdi;LIU Bing;CAO Yue(College of Chemistry and Chemical Engineering,Xinyang Normal University,Xinyang 464000,China;Shangtianti Precinct,Xinyang 464000,China)

机构地区：[1]信阳师范学院化学化工学院,河南信阳464000 [2]信阳市上天梯管理区,河南信阳464000

出　　处：《信阳师范学院学报（自然科学版）》2022年第4期615-620,共6页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(62105277);河南省自然科学基金项目(202300410341)。

摘　　要：采用简单的水热合成法制备了双过渡金属硫化物Zn_(0.76)Co_(0.24)S纳米材料,并作为超级电容器电极材料。该材料具有花状多孔的微观形貌,花瓣为超薄纳米片结构。这样独特的结构能为电化学反应提供丰富的活性位点,为离子的传输提供便利的通道,同时也为反复充放电过程中材料体积的变化提供了缓冲空间。三电极体系测试结果表明:Zn_(0.76)Co_(0.24)S电极在电流密度为1 mA/cm^(2),比电容高达2031.0 C/g;当电流密度增大到30 mA/cm^(2)时,电容量仍可保持在888.9 C/g;在电流密度为10 mA/cm^(2)下循环充放电5000圈,电容量保持率为90.25%,表现出较高的电容量、优异电容稳定性以及循环性能。采用Zn_(0.76)Co_(0.24)S电极与活性炭(AC)构建的混合超级电容器Zn_(0.76)Co_(0.24)S∥AC也展现了令人满意的性能。Zn_(0.76)Co_(0.24)S nanomaterials are prepared by a simple hydrothermal method and used as electrode materials for supercapacitors.Structural analyses show that the as-synthesized material presents flower-like porous micromorphology and ultrathin nanosheets are serve as the petals.The distinct structure could not only provide much more active sites and fast ion transport paths for electrochemical reactions,but also provide the buffer spaces for volume variety in repeat charge-discharge process,thus leading to outstanding electrochemical performances.The electrochemical characterization results in the three-electrode system show that Zn_(0.76)Co_(0.24)S nanomaterials exhibit a high specific capacity and excellent rate capability and cycling stability.At 1 mA/cm^(2),the Zn_(0.76)Co_(0.24)S electrode delivers a high specific capacity of 2031.0 C/g.Moreover,the capacity can still be maintained at 888.9 C/g when the current density reaches 30 mA/cm^(2).At 10 mA/cm^(2),after 5000 charge-discharge cycles,the Zn_(0.76)Co_(0.24)S favors a high capacity retention of 90.25%.Hybrid surpercapacitors fabricatedwith Zn_(0.76)Co_(0.24)S and AC also exhibit satisfactory performance.The remarkable electrochemical properties are mainlyascribed to the intrinsic high conductivity of Zn_(0.76)Co_(0.24)S and the unique flower-like porous microstructure.

关 键 词：Zn_(0.76)Co_(0.24)S 双过渡金属硫化物 花状纳米结构 超级电容器 电化学性能 

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]