Abstract
Manganese oxide thin films are deposited on graphite foils by a simpler one-step reactive dc sputtering dry process with different volume flow rates of oxygen, sputtering time, pressure, and power. Maximum mass specific capacitance of 344 F/g is obtained in 0.5 M LiCl as well as with optimum sputtering conditions (volume flow rate of , sputtering , sputtering , and sputtering ), and this demonstrates its good mass specific capacitance at a higher sweep rate of 100 mV/s. Furthermore, the geometric specific capacitance increases with increasing sputtering pressure, power, and time. Moreover, the electrochemical stability of the electrode decreases with increasing sputtering pressure.
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