Fe_(2)O_(3)纳米片薄膜的制备及其电化学性能  

Preparation and Electrochemical Performances of Fe_(2)O_(3) Nanosheet Films

作　　者：张伟 顼建乐 李廷鱼 郭丽芳 李刚 Zhang Wei;Xu Jianle;Li Tingyu;Guo Lifang;Li Gang(Center of Nano Energy and Devices,College of Information and Com puter,Taisyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学信息与计算机学院纳米能源与器件中心,太原030024

出　　处：《微纳电子技术》2021年第10期935-942,共8页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(U1810204,61901293,22002083,21905099);山西省自然科学基金资助项目(201901D111099);山西省高校科技创新研究项目(2016138)。

摘　　要：氧化铁因具有丰富的储量、高的理论比容量及稳定的负电势窗口,常作为负极材料被广泛研究。然而,通常氧化铁粉末需要通过导电剂和粘合剂负载到集流体上制成电极,不可避免地增加了电极材料的接触电阻,造成超级电容器电化学性能下降。以不锈钢为基础材料,利用阳极氧化在不锈钢表面构建活性物质与集流体一体化纳米结构薄膜电极。为克服传统阳极氧化电压高、氧化时间长、反应温度低等缺点,通过稀盐酸对不锈钢表面进行预处理除去氧化层优化阳极氧化反应条件,在含有0.1 M(1 M=1 mol/L)NH4F(纯度>98%)和0.1 M H2O的乙二醇(EG)(纯度99%)溶液中,在30 min超短时间内通过施加超低电压30 V,在室温环境下对不锈钢进行阳极氧化,在其表面成功生长出氧化铁纳米片薄膜电极材料,退火后直接实现活性电极材料和集流体的一体化集成制备,无需导电剂和粘合剂。实验结果表明,不锈钢阳极氧化制备的一体化电极表现出优异的电化学性能,在1 M Na2SO4的电解质中,当电流密度为1 mA·cm^(-2)时比电容高达160 mF·cm^(-2),1000次循环后的电容保持率接近63.8%。因此,不锈钢表面预处理不仅能够有效降低阳极氧化电压和缩短氧化时间,还能增加活性物质负载量和改变电极材料形貌结构,为制备高性能活性物质与集流体一体化电极提供了一种新思路。Due to abundant reserves,high theoretical specific capacity and stable negative potential window,iron oxide has been widely studied as a negative electrode material.However,iron oxide powder usually needs to be loaded onto the collector by conductive agents and binders to make electrodes,which inevitably increases the contact resistance of electrode materials and causes the degradation of electrochemical performances of supercapacitors.With stainless steel as the base material,nanostructured thin film electrodes with integrated active material and collector were constructed on the surface of stainless steel by anodic oxidation.To overcome the defects of conventional anodic oxidation,such as high voltage,long oxidation time and low reaction temperature,the surface of stainless steel was pretreated with dilute hydrochloric acid to remove the oxide layer and then to optimize the anodic oxidation reaction conditions.The stainless steel was anodized in ethylene glycol(EG)(a purity of 99%)solution with 0.1 M(1 M=1 mol/L)NH4F(purity>98%)and 0.1 M H2O by applying a ultra-low voltage of 30 V for a ultra-short time of 30 min at room temperature.Thus,iron oxide nanosheet film electrode material was successfully grown on its surface,and the integrated preparation of the active electrode material and collector was achieved directly after annealing without conductive agent and binder.The experimental results show that the integrated electrode prepared by anodizing stainless steel exhibits excellent electrochemical performance,with a specific capacitance as high as 160 mF·cm^(-2)at a current density of 1 mA·cm^(-2)in an electrolyte of 1 M Na2SO4 and a capacitance retention rate of close to 63.8%after 1000 cycles.Therefore,the surface pretreatment of stainless steel can effectively reduce the anodic oxidation voltage and shorten the oxidation time,and increase the active substance loa-ding and change the morphological structure of the electrode material,providing a new idea for the preparation of high-performance active substa

关 键 词：纳米片薄膜 不锈钢 无粘结剂 阳极氧化 氧化铁 超级电容器 

分 类 号：TB383[一般工业技术—材料科学与工程] TM53[电气工程—电器]