• ADIL AHMAD

      Articles written in Bulletin of Materials Science

    • Electrodeposited thick coatings of V$_2$O$_5$ on Ni foam as binder free electrodes for supercapacitors

      ASMA AAMIR ADIL AHMAD YAQOOB KHAN ZIA -UR-REHMAN NOOR UL AIN SAID KARIM SHAH MAZHAR MEHMOOD BILAL ZAMAN

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      Thick coatings, up to few microns, of the active material are necessary for the preparation and commercialization of electrode materials for energy storage applications, as thin layers of active material drains out of the currentcollector after a few cycles. Moreover, larger mass loading of the active material is required for high energy density pseudocapacitor applications as more active material involves more redox reactions to store large amount of charge. Thisstudy reports thick electrodeposits of vanadium pentoxide (V$_2$O$_5$) on nickel foam substrate and its evaluation as supercapacitor electrode material. Vanadium pentoxide with thickness of 3–5 $\mu$m were successfully electrodeposited (potentiostatically and galvanostatically) on metallic nickel foam to obtain potentiostatically electrodeposited V$_2$O$_5$ on nickel foam (PE-V$_2$O$_5$Ni) and galvanostatically electrodeposited V$_2$O$_5$ on nickel foam (GE-V$_2$O$_5$Ni), respectively. The PEV$_2$O$_5$Ni electrode with layered morphologies exhibits more charge storage and discharge capability than spherically dense morphologies of GE-V$_2$O$_5$Ni electrodes. The synthesized electrode materials were structurally, morphologically andchemically characterized through X-ray diffractometer, X-ray photoelectron spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The PE-V$_2$O$_5$Ni and GE-V$_2$O$_5$Ni exhibited gravimetric capacitance of 657 and 421 F g$^{-1}$ with tremendous stability in the polypropylene carbonate electrolyte.

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