MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Institute of Optoelectronic and Functional Composite Materials, Sun Yat-Sen University, Guangzhou 510275, China.
Langmuir. 2010 Feb 16;26(4):2209-13. doi: 10.1021/la903947c.
MnO(2) as one of the most promising candidates for electrochemical supercapacitors has attracted much attention because of its superior electrochemical performance, low cost, and environmentally benign nature. In this Letter, we explored a novel route to prepare mesoporous MnO(2)/carbon aerogel composites by electrochemical deposition assisted by gas bubbles. The products were characterized by energy-dispersive spectrometry (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The MnO(2) deposits are found to have high purity and have a mesoporous structure that will optimize the electronic and ionic conductivity to minimize the total resistance of the system and thereby maximize the performance characteristics of this material for use in supercapacitor electrodes. The results of nitrogen adsorption-desorption experiments and electrochemical measurements showed that these obtained mesoporous MnO(2)/carbon aerogel composites had a large specific surface area (120 m(2)/g), uniform pore-size distribution (around 5 nm), high specific capacitance (515.5 F/g), and good stability over 1000 cycles, which give these composites potential application as high-performance supercapacitor electrode materials.
MnO(2) 作为电化学超级电容器最有前途的候选材料之一，由于其卓越的电化学性能、低成本和环境友好性而引起了广泛关注。在本研究中，我们探索了一种通过电化学沉积辅助气泡来制备介孔 MnO(2)/碳气凝胶复合材料的新途径。通过能量色散光谱仪 (EDS)、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 对产物进行了表征。发现 MnO(2) 沉积物具有高纯度和介孔结构，这将优化电子和离子电导率，以最小化系统的总电阻，从而最大限度地提高该材料在超级电容器电极中的性能特征。氮吸附-脱附实验和电化学测量结果表明，这些获得的介孔 MnO(2)/碳气凝胶复合材料具有大的比表面积（120 m(2)/g）、均匀的孔径分布（约 5 nm）、高比电容（515.5 F/g）和良好的稳定性超过 1000 次循环，这使得这些复合材料有潜力作为高性能超级电容器电极材料得到应用。
