Heliyon, Год журнала: 2024, Номер 11(1), С. e41427 - e41427

Опубликована: Дек. 21, 2024

Manganese dioxide (MnO2) is a well-known pseudocapacitive material that has been extensively studied and highly regarded, especially in supercapacitors, due to its remarkable surface redox behavior, leading high specific capacitance. However, full potential impeded by inherent characteristics such as low electrical conductivity, dense morphology, hindered ionic diffusion, resulting limited rate capability supercapacitors. Addressing this issue often requires complicated strategies procedures, designing sophisticated composite architectures. This study introduces straightforward cost-effective approach tune enhance the of MnO2 pseudocapacitor electrodes fabricated via electrodeposition method. Among parameters, deposition time electrolyte concentration, which influence mass loading, electrode thickness, microstructure, electrochemical properties, were primary focus. Various prepared potentiostatically two-electrode cathodic setup on Ni foam substrate KMnO4 aqueous electrolyte, with bath concentrations (in terms Mn ion) 0.01 0.1 M, times ranging from 1 15 min. Optimal capabilities achieved at times, primarily structural properties under circumstances. While M concentration resulted formation electrolytic supercapacitive sensitivity, reducing led birnessite δ-MnO2, capable maintaining reasonable capacitance range approximately 90-100 Fg-1 almost no sensitivity charging/discharging rate, confirmed galvanostatic charge-discharge (1-10 Ag-1) cyclic voltammetry (10-100 mVs-1) examinations. Along positive impacts layered large interlayer spacing, porous morphology (vertically aligned two-dimensional interconnected columns) thickness (≈2 μm) lowest (0.01 min electrode) contributed fast diffusion kinetics for charge storage consequent capability.

Язык: Английский