Articles written in Bulletin of Materials Science

    • Supercapacitor fabricated with 30 M KOH electrolyte and highly stable Pd$_4$S electrodes


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      In this work, supercapacitors have been fabricated using Pd$_4$S electrode material which is highly conducting and chemically robust to the acid and alkali media. The synthesis strategy is simple and involves a single step thermolysis of palladium octanethiolate film in the H$_2$ atmosphere at 250°C for 1 h. Besides its conducting nature, its porous morphology makes it a suitable electrode material for supercapacitors. The electrochemical properties of the Pd4S were examined in harsh alkali media (30 M KOH). Typically, in the literature, only lower electrolyte concentration (1–6 M KOH) is preferred as the electrode may not withstand higher concentrations. Using the prepared Pd$_4$S film as supercapacitor electrode, a specific capacitance of 570 F g$^{-1}$ with energy and power densities of 28 Wh kg$^{-1}$ and 1.5 kW kg$^{-1}$, respectively, were achieved with 30 M KOH electrolyte. After 1500 cycles of charging and discharging with a constant current density of 1.75 A g$^{-1}$, more than 98% capacitance retention was observed.

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