Mesoporous MnO2/carbon aerogel composites as promising electrode materials for high-performance supercapacitors.
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.
Li
Gao-Ren
GR
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.
Feng
Zhan-Ping
ZP
Ou
Yan-Nan
YN
Wu
Dingcai
D
Fu
Ruowen
R
Tong
Ye-Xiang
YX
D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005782:Gels / Q000737:chemistry*; D017895:Manganese Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D008422:Materials Testing; D009584:Nitrogen / Q000737:chemistry; D010087:Oxides / Q000138:chemical synthesis / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
D005782:Gels; D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D002244:Carbon; D009584:Nitrogen