Electrodeposition synthesis and electrochemical properties of nanostructured γ-MnO2 films
Electrodeposition synthesis and electrochemical properties of nanostructured γ-MnO2 films
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DOI：
10.1016/j.jpowsour.2006.06.033
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发表时间：
2006-11-08
影响因子：
9.2
通讯作者：
Chen, Jun
中科院分区：
文献类型：
--
作者：
Chou, Shulei;Cheng, Fangyi;Chen, Jun
采用恒电位和循环伏安相结合的电沉积技术在镍片上制备了厚度约为20 nm、宽度至少为200 nm的杨桃状γ-MnO 2纳米片薄膜。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）等手段对所制备的MnO 2纳米材料进行表征，并将其作为碱性锌锰电池和电化学超级电容器正极活性材料。电化学测试表明，在500 mA g（-1）I的放电电流密度下，MnO 2纳米片薄膜在Zn/MnO 2电池中表现出高的电位平台（约1.0 V vs Zn），在1 mA cm（-2）的放电电流密度下表现出240 F g（-1）的高比电容。这表明了杨桃状γ-MnO 2纳米片在高功率电池和电化学超级电容器中的潜在应用。基于恒电位和循环伏安技术，讨论了一维和三维纳米结构MnO 2的生长过程。该合成方法可推广到其他纳米结构金属氧化物薄膜的制备。(C)2006 Elsevier B. V.保留所有权利。
The thin films of carambola-like gamma-MnO2 nanoflakes with about 20nm in thickness and at least 200nm in width were prepared on nickel sheets by combination of potentiostatic and cyclic voltammetric electrodeposition techniques. The as-prepared MnO2 nanomaterials, which were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), were used as the active material of the positive electrode for primary alkaline Zn/MnO2 batteries and electrochemical supercapacitors. Electrochemical measurements showed that the MnO2 nanoflake films displayed high potential plateau (around 1.0 V versus Zn) in primary Zn/MnO2 batteries at the discharge current density of 500 mA g(--1) I and high specific capacitance of 240 F g(--1) at the current density of 1 mA cm(--2). This indicated the potential application of carambola-like gamma-MnO2 nanoflakes in high-power batteries and electrochemical supercapacitors. The growth process for the one- and three-dimensional nanostructured MnO2 was discussed on the basis of potentiostatic and cyclic voltammetric techniques. The present synthesis method can be extended to the preparation of other nanostructured metal-oxide films. (C) 2006 Elsevier B.V. All rights reserved.