Enhanced activity of chemically synthesized hybrid graphene oxide/Mn3O4 composite for high performance supercapacitors
Enhanced activity of chemically synthesized hybrid graphene oxide/Mn3O4 composite for high performance supercapacitors
复制标题
DOI：
10.1016/j.electacta.2012.12.120
复制
发表时间：
2013-03-01
影响因子：
6.6
通讯作者：
Lokhande, Chandrakant D.
中科院分区：
文献类型：
--
作者：
Gund, Girish S.;Dubal, Deepak P.;Lokhande, Chandrakant D.
在这项研究中，我们已经提高了碳基氧化石墨烯（GO）和金属氧化物为基础的锰氧化物（Mn 3 O 4）薄膜的电容通过制备GO/Mn 3 O 4复合薄膜使用简单和廉价的连续离子层吸附和反应（SILAR）方法。采用X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、拉曼光谱、扫描电子显微镜（SEM）、能量色散X射线能谱（EDAX）和比表面积（BET）等技术对薄膜进行了表征。XRD分析揭示了GO，Mn 3 O 4和GO/Mn 3 O 4复合薄膜的形成，FTIR研究揭示了各自材料之间的特征化学键合。此外，拉曼光谱测试证实了GO和GO/Mn 3 O 4复合薄膜的形成。SEM图像表明，通过形成GO和Mn 3 O 4材料的复合物，可以容易地调节GO和Mn 3 O 4薄膜的表面结构，从而导致系统的优异的可加工性。用BET法测定了GO/Mn_3O_4复合材料的比表面积（94 m_2·g ~（-1））。使用循环伏安法（CV）和恒电流充放电技术在1 M Na 2SO 4中评价不同电极的超级电容行为。当扫描速率为5 mys（-1）时，GO/Mn_3O_4复合电极的比电容达到344 Fg（-1）。此外，对GO、Mn 3 O 4和GO/Mn 3 O 4电极进行了阻抗测量，表明GO/Mn 3 O 4复合电极是超级电容器应用的有前途的材料。(C)2013爱思唯尔有限公司保留所有权利。
In this study, we have improved the capacitance of carbon based graphene oxide (GO) and metal oxide based manganese oxide (Mn3O4) thin films by preparing thin films of GO/Mn3O4 composite using simple and inexpensive successive ionic layer adsorption and reaction (SILAR) method. These prepared films are characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDAX) and BET techniques. The XRD analysis reveals the formation of GO, Mn3O4 and GO/Mn3O4 composite thin films and the FTIR studies disclose the characteristic chemical bonding between the respective materials. Furthermore, Raman measurements confirm the formation of GO and GO/Mn3O4 composite thin films. The SEM images demonstrate that the surface structure of GO and Mn3O4 thin films can be easily tuned by forming the composite of GO and Mn3O4 materials leading to excellent processability of a system. The surface area of GO/Mn3O4 composite (94 m(2) g(-1)) is measured by using Brunauer-Emmett-Teller (BET) technique. The supercapacitive behaviors of different electrodes are evaluated using cyclic voltammetry (CV) and galvanostatic charge-discharge techniques in 1 M Na2SO4. The specific capacitance of 344 Fg(-1) is achieved for GO/Mn3O4 composite electrode at a scan rate of 5 my s(-1). In addition, impedance measurements of the GO, Mn3O4 and GO/Mn3O4 electrodes are executed proposing that the GO/Mn3O4 composite electrodes are promising materials for supercapacitor application. (C) 2013 Elsevier Ltd. All rights reserved.