title: Mesoporous MnO2/carbon aerogel composites as promising electrode materials for high-performance supercapacitors.
abstract: 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.
authors.affiliation: 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.
authors.forename: Gao-Ren
authors.initials: GR
authors.lastname: Li
authors.forename: Zhan-Ping
authors.initials: ZP
authors.lastname: Feng
authors.forename: Yan-Nan
authors.initials: YN
authors.lastname: Ou
authors.forename: Dingcai
authors.initials: D
authors.lastname: Wu
authors.forename: Ruowen
authors.initials: R
authors.lastname: Fu
authors.forename: Ye-Xiang
authors.initials: YX
authors.lastname: Tong
mesh_terms: 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
chemical_list: D005782:Gels; D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D002244:Carbon; D009584:Nitrogen