I have a Graphene hydrogel (GH) and I pressed onto graphite with about 100MPa. The GH is just in one side of graphite support. When I did charge discharge galvanostatic of GH, the back of graphite is in contact with the solution, Is the back of graphite in contact with solution affect to the charge discharge galvanostatic Test?.
- Just a few things more, first I did my test with the back of graphite in contact with the electrolyte, second I did covering the back with PTFE, and third I did just with the graphite. I calculated Specific Capacitance of Graphite and it was very low, and I supposed that it is not affect the performance but when I compared the discharge time of GH with the back of graphite en contact with the solution and without a contact, in the first case is larger. Is it means that if graphite back is in contact with the solution, I have to take in count tha mass of graphite as active material?
The present investigation describes the addition of iron (Fe) in order to improve the supercapacitive properties of MnO2 electrodes using galvanostatic mode. These amorphous worm like Fe: MnO2 electrodes are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDAX), Fourier transform infrared spectroscopy (FTIR) and wettability test. The supercapacitive properties of MnO2 and Fe: MnO2 electrodes are investigated using cyclic voltammetry, chronopotentiometry and impedance techniques. It is seen that the supercapacitance increases with increase in Fe doping concentration and achieved a maximum of 173 F g−1 at 2 at% Fe doping. The maximum supercapacitance obtained is 218 F g−1 for 2 at% Fe: MnO2 electrode. This hydrous binary oxide exhibited ideal capacitive behavior with high reversibility and high pulse charge–discharge property between −0.1 and +0.9 V/SCE in 1 M Na2SO4 electrolyte indicating a promising electrode material for electrochemical supercapacitors.
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Article Galvanostatically deposited Fe: MnO 2 electrodes for superca...
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