花状与颗粒状NiMn2O4纳米材料的制备及其超级电容性能  

Preparation of NiMn2O4 nanoflowers and NiMn2O4 nanoparticles and their electrochemical properties in supercapacitor

作　　者：李明伟[1] 杨绍斌[1] 贾婧 顾金峰 耿福洋 LI Mingwei;YANG Shaobin;JIA Jing;GU Jinfeng;GENG Fuyang(College of Materials Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;College of Mechanical Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China)

机构地区：[1]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学机械工程学院,辽宁阜新123000

出　　处：《化工进展》2020年第5期1844-1850,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51274119)。

摘　　要：分别以尿素和氨水为沉淀剂,采用热溶剂法制备了多孔的花状NiMn2O4和颗粒状NiMn2O4纳米电极材料,采用X射线衍射仪、扫描电镜、透射电镜和N2吸附-脱附等手段对NiMn2O4材料的物相、形貌结构和孔径分布进行了表征,并通过循环伏安、恒电流充放电、交流阻抗等方法测试了所制备材料的电化学性能。研究了沉淀剂对NiMn2O4材料形貌、微观结构及电化学性能的影响。结果表明:以尿素为沉淀剂的NiMn2O4是由纳米片组成的花状结构,纳米片厚度为50~60nm,比表面积为104m2/g。在1A/g电流密度下比电容为1614F/g,在5A/g电流密度下,尿素为沉淀剂的花状NiMn2O4材料经1000次恒电流充放电后其比电容可达初始值的89%。以氨水为沉淀剂的多孔NiMn2O4为直径约30nm的纳米颗粒结构,颗粒间团聚严重,比表面积为91m2/g。在1A/g电流密度下比电容为1147F/g,在5A/g电流密度下,氨水为沉淀剂的颗粒状NiMn2O4材料经1000次恒电流充放电后其比电容可达初始值的80%。尿素为沉淀剂的花状NiMn2O4具有优越的超级电容性能。Porous NiMn2O4 nanoflowers and NiMn2O4 nanoparticles were synthesized by solvothermal method with urea and ammonia as the precipitant agent,respectively.Physical phase,morphology and pore size distribution of the NiMn2O4 products were analyzed by XRD,SEM,TEM and N2 adsorption-desorption.The electrochemical performance was tested by cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy.The effects of precipitant on the morphology,microstructure and electrochemical properties of the NiMn2O4 materials were studied.The results showed that NiMn2O4 with urea as precipitant agent had flower-shaped structures with diameters of several microns that was composed of nanosheets,whose thickness and specific surface area were about 50—60nm and 104m^2/g,respectively.The specific capacitance of NiMn2O4 nanoflower was 1614F/g at 1A/g and still maintained 89%specific capacitance after galvanostatic charge-discharge 1000 cycles at 5A/g.On the other hand,the porous NiMn2O4 using ammonia as precipitant agent has nanoparticles structure with a diameter of about 30nm,and the agglomeration among particles was severe,with the specific surface area of 91m^2/g.The specific capacitance of NiMn2O4 nanoparticles was 1147F/g at 1A/g and maintained 80%after 1000 charge-discharge cycles at 5A/g.The NiMn2O4 nanoflowers shows superior supercapacitor performance.

关 键 词：制备 结晶 水热 纳米材料 

分 类 号：O614[理学—无机化学]