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Gomaa A.M. Ali,Mashitah M. Yusoff,Yun Hau Ng,Hong Ngee Lim,Kwok Feng Chong 한국물리학회 2015 Current Applied Physics Vol.15 No.10
The structural and electrochemical properties of manganese oxide (MnO2) electrodeposited by potentiostatic and galvanostatic conditions are studied. X‒ray diffraction analyses confirm identical MnO2 phase (ramsdellite) are deposited under potentiostatic and galvanostatic conditions. Under comparable current density during electrodeposition, MnO2 deposited by galvanostatic condition shows smaller crystallite size, less compact layered structure, higher surface area and wider band gap, in comparison to the potentiostatic deposition. The MnO2 morphology difference under different electrodeposition conditions contributes to different capacitive behaviors. The lower compactness of MnO2 deposited galvanostatically renders facile ions diffusion, leading to higher specific capacitance with low equivalent series resistance. The findings suggest galvanostatic electrodeposition is suitable to produce MnO2 nanostructure for supercapacitor application.
OSAMA A. FOUAD,GOMAA A. M. ALI,M. A. I. EL-ERIAN,SALAH A. MAKHLOUF 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5
Ultra¯ne Co3O4=SiO2 nanocomposites were obtained via sol?gel (SG) method and related routes. The samples were characterized using X-ray di®raction (XRD), transmission electron microscopy (TEM) and N2 adsorption?desorption techniques. The obtained phase, size of crystallites and speci¯c surface area of the composites vary with the Co:SiO2 weight ratio and preparation route. Humidity sensing properties measured by monitoring the DC conductivity for the obtained nanocomposites are reported. Conductivity changes amount to four orders of magnitudes were observed in response to 10?90% relative humidity change in the measuring chamber. Results indicate that humidity sensing properties depend on Co content and speci¯c surface area of the composite.