Abstract:
Copper, nickel, and cobalt-doped δ-MnO2 nanosheets were synthesized using self-propagating flame synthesis and ion exchange. They were analyzed after both steps using X-Ray diffraction, scanning electron microscopy, and electron dispersive spectroscopy. The samples were painted onto nickel foil to make electrodes to test for the specific capacitance. The copper doped sample had an approximate 1:33 Cu:Mn ratio and a specific capacitance of 176 F/g, which was a 22% increase from undoped samples. The nickel doped sample had an estimated 1:35 Ni:Mn ratio and had a specific capacitance of 194 F/g, which was a 29% increase from undoped samples. The cobalt sample had a Co:Mn ratio of about 1:28 and a specific capacitance of 119 F/g, which was a 14% decrease from the undoped sample. It was concluded that the number of vacancies left behind in the sample after ion exchange increased the capacitance of the sample.
