摘要
以硝酸钴和硝酸镍作为原料,分别使用不同浓度的乙醇和异丙醇作溶剂,采用溶剂热法在泡沫镍上合成前驱体,而后将前驱体煅烧得到钴酸镍,探究溶剂的种类及浓度对合成材料的形貌及电化学性能的影响。通过X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)以及扫描电镜(SEM)对产物进行表征,分析材料的组分和微观形貌;采用循环伏安法(CV)、恒电流充放电法(GCD)以及交流阻抗法(EIS)对产物的电化学性能进行分析。结果表明:在50%体积浓度的乙醇及异丙醇溶液中合成的钴酸镍都具有规则的纳米线结构,该结构有利于氧化还原反应的进行,从而使材料表现出良好的电化学性能;在50%体积浓度的乙醇溶液中合成的钴酸镍电化学性能较优,在充放电电流密度为1 A/g时其比电容为627 F/g,循环500次后其电容保持率为94%。
With cobalt nitrate and nickel nitrate as raw materials,ethanol and isopropanol of different concentrations as solvents,the precursor was synthesized on foam nickel by solvothermal method and calcined to obtain nickel cobaltite,to investigate the effects of solvent type and concentration on the morphology and electrochemical properties of the synthesized products.The sample was characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM)to determine the phase composition and to observe its micromorphology.The electrochemical properties of the sample were tested by cyclic voltammetry(CV),galvanostatic charge-discharge(GCD)and electrochemical impedance spectroscopy(EIS).The results show that the nickel cobaltite synthesized in 50%volume concentration of ethanol solution and isopropanol solution both have a regular nanowire structure,which is conducive to the redox reaction,contributing to the good electrochemical properties of the material.The nickel cobaltite synthesized in 50%volume concentration of ethanol solution shows better electrochemical performance,with a specific capacitance of 627 F/g at the current density of 1 A/g,and a capacity retention rate of 94%after 500 cycles at the current density of 10 A/g.
作者
王碧侠
韩家浩
于翔
党晓娥
梁李斯
WANG Bixia;HAN Jiahao;YU Xiang;DANG Xiao’e;LIANG Lisi(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《有色金属科学与工程》
北大核心
2025年第3期337-346,共10页
Nonferrous Metals Science and Engineering
基金
陕西省自然科学基础研究资助项目(2021JM-374)。
关键词
钴酸镍
溶剂热法
乙醇
异丙醇
电化学性能
Nickel cobaltite
solvothermal method
ethanol
isopropanol
electrochemical performance
作者简介
通信作者:王碧侠(1976-),博士,教授,主要从事冶金资源综合利用与储能材料制备方向的研究。E-mail:yj-wangbixia@xauat.edu.cn。
