明胶填充泡沫Ni并负载NiCo_(2)O_(4)纳米阵列电极的制备及超级电容性能  

Fabrication of NiCo_(2)O_(4) Nanoarrays Grown on Gelatin-filled Nickel Foams as Supercapacitor Electrodes

作　　者：林晓阳 何亚欣 杨春明[1] 李威 宋应琳 LIN Xiao-yang;HE Ya-xin;YANG Chun-ming;LI Wei;SONG Ying-lin(College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China)

机构地区：[1]湖南师范大学化学化工学院,中国长沙410081

出　　处：《湖南师范大学自然科学学报》2021年第3期63-67,共5页Journal of Natural Science of Hunan Normal University

基　　金：湖南省科技计划重点项目(2011GK2014);湖南省大学生创新创业训练项目(S20190542068)。

摘　　要：通过使用明胶凝胶生物质填充再在空气中煅烧实现对泡沫镍冗余空隙的有效填充,再采用水热法在填充后的泡沫镍上原位生长NiCo_(2)O_(4)纳米阵列直接用作免粘合剂的自支撑超级电容器电极材料。借助SEM电镜、Raman光谱及XRD对获得的电极材料进行形貌、结构及物相表征,测试该电极材料的循环伏安、恒电流充放电和交流阻抗等电化学性能。实验结果表明,在三电极体系中以2 mol·L^(-1)KOH溶液作电解质,该电极材料的比容量达到25714 F·m^(-2);当电流密度从10 A·m^(-2)增加到200 A·m^(-2)时,其比容量保持约58.3%,倍率性能良好;在200 A·m^(-2)电流密度下充放电循环2000次后其比容量保留率高达109.3%,表现出优良的循环稳定性。In this work,useless voids of commercial nickel foam(NF)were effectively filled by using gelatin gels and subsequent calcination in air,and then NiCo_(2)O_(4)nanoarrays were hydrothermally grown on the filled nickel foam as binder-free self-supporting supercapacitor electrode materials.The morphology,molecular structure and phase composition of the as-prepared NiCo_(2)O_(4)@NF were characterized by SEM,Raman spectroscopy and XRD techniques.Their electrochemical performance was evaluated by cyclic voltammetry,galvanostatic charge and discharge,and AC impedance methods.Our results show that in the three-electrode system with 2 mol·L^(-1)KOH as the aqueous electrolyte,the specific capacity of NiCo_(2)O_(4)@NF electrode amounts to 25714 F·m^(-2).The initial specific capacitance can retain about 58.3%when the current density is increased from 10 A·m^(-2)to 200 A·m^(-2),showing good rate capability.Finally,the specific capacity retention reached 109.3%after 2000 consecutive charging and discharging cycles at current density of 200 A·m^(-2),indicating excellent cycle stability.

关 键 词：泡沫镍 明胶 NiCo_(2)O_(4)纳米阵列 超级电容器 循环稳定性 

分 类 号：TQ138.1[化学工程—无机化工] TM53[电气工程—电器]