Supercapacitors have been studied since the 1950s as efficient energy storage systems, owing to their high energy density and higher power density compared to conventional capacitors and batteries, respectively. Traditionally supercapacitors have been dividing into two categories: Electric Double-Layer Capacitors (EDLC) and Faradaic supercapacitors. Recently, however, interest has turned to develop materials that fit into the third category of pseudocapacitive materials that display electrochemical characteristics that are neither purely capacitive nor purely Faradaic. MnO2 (MD) has emerged as one such material, in which both charge storage mechanisms involve a rapid reversible redox reaction. Upon electrodeposition of MD, favourable electrochemical properties have been achieved and further tuned through doping with metal ions. Here, the theoretical investigation of the modifications of MD through doping has been undertaken and compared to experimental data to study the effects on the electronic structure and electrochemical properties.

Electrochemical properties of MnO2 and doped MnO2 pseudocapacitance materials

ACS Fall 2021

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