Improving electrochemically deposited manganese oxide thin film pseudocapacitance and long term cycling stability

What role does a coating of titanium dioxide play in improving the capacitance of electrochemically deposited manganese oxide thin film?

Project Abstract

Manganese dioxide is being extensively studied as a pseudocapacitor. Pseudocapacitors charge faster than traditional batteries and have a higher energy densities than capacitors, making them ideal for many applications including fast- recharging bike lights. A facile electrochemical approach was used to deposit manganese dioxide thin films onto conductive glass substrates. The effect of incorporating transition metal ions into the deposition solution was studied. Cobalt was found to have a positive effect on the long-term cycling stability of the films. Copper was found to increase the specific capacitance, but did not improve the stability of the films. A thin coating of titanium dioxide nanoparticles had the most profound effect, approximately doubling the specific capacitance and stability of the MnO2 films, possibly due to the manganese dioxide film being secured to the substrate by the titanium dioxide.

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