功能化的碳纳米管纸上α-Co(OH)2多孔蜂窝状薄膜的电沉积生长及其电化学电容行为  

Growth and electrochemical capacitance performance of porous honeycomb-likeα-Co(OH)_(2)film electrodeposited on functionalized carbon nanotube papers

作　　者：门春艳[1] 蔡龙成 陶晶 李娟[2] MEN Chun-yan;CAI Long-cheng;TAO Jing;LI Juan(Department of chemical technology,Xinjiang applied vocational Technical College,kuitun 833200 China;College of Chemistry,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆应用职业技术学院化工技术系,新疆奎屯833200 [2]新疆大学化学学院,新疆乌鲁木齐830046

出　　处：《化学研究与应用》2022年第9期2088-2095,共8页Chemical Research and Application

基　　金：新疆应用职业技术学院科研课题科学研究项目(XYZY2021KYB002)资助。

摘　　要：以浓硝酸回流纯化和电化学氧化处理的碳纳米管纸(EA-CNT)为基底,采用恒电位电沉积法制备了具有多孔蜂窝状结构的α-Co(OH)_(2)/EA-CNT纸柔性复合薄膜。采用X射线衍射(XRD)和扫描电子显微镜(SEM)对复合材料进行物性表征。所得复合薄膜材料中α-Co(OH)_(2)为纯相二维纳米薄片相互交错形成疏松蜂窝状网络结构。探讨了多孔蜂窝状薄膜材料的形成机理,系统地考察了沉积时间对多孔α-Co(OH)_(2)的微观结构以及电化学性能的影响。研究发现:电沉积电位-0.75 V,沉积时间为30 min制备的柔性复合薄膜材料展现出优良的电化学性能。无需加入导电剂和粘结剂,电流密度为1 A·g^(-1)时,比电容高达1822 F·g^(-1),经过1500周循环,比容量稳定保持在初始容量的88%,在10 A·g^(-1)比电容仍能保持1200 F·g^(-1)。该α-Co(OH)_(2)/EA-CNT纸柔性复合薄膜展现出在高性能超级电容器柔性电极材料的潜在应用价值。Uniform porous honeycomb-likeα-Co(OH)_(2)/EA-CNT paper flexible composite film were prepared by potentiostatic electrodeposition method,which use conducting carbon nanotube papers(EA-CNT)prepared by nitric acid reflux purifying and electrochemical oxiding as substrate.The surface morphology and microstructure of the composite were characterized by X-ray diffraction(XRD)and sanning election microscopy(SEM),The results indicate that the as-preparedα-Co(OH)_(2)film materials are pure phase two-dimensional nanoflakes crossing loose honeycomb network-like struture.The growth mechanism of porous honeycomb-like structure film material was discussed.The effects of electrodeposition time on the microstructure and electrochemical capacitance performance of prepared porousα-Co(OH)_(2)film were systematically studied.The as-preparedα-Co(OH)_(2)film directly deposited on EA-CNT paper shows excellent electrochemical properties at potential of-0.75 V last for 30 minutes.Without adding any polymer binder and conducting agent,this novel structure brings the composite paper an electrochemical capacitance high to 1822 F·g^(-1)at the current density of 1 A·g^(-1),and stably keep 88%of initial capacitance after over 1500 charge-discharge cycles,and maintains 585 F·g^(-1)at 10 A·g^(-1),suggesting that theα-Co(OH)_(2)/EA-CNT paper flexible composite film would be an ideal flexible electrode material for a supercapacitor.

关 键 词：碳纳米管 α-Co(OH)_(2) 电沉积 多孔薄膜 柔性电极 电容 

分 类 号：O646[理学—物理化学]