Electrodeposited thick coatings of V 2 O 5 on Ni foam as binder free electrodes for supercapacitors
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Bull Mater Sci (2020) 43:273 https://doi.org/10.1007/s12034-020-02249-6
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Electrodeposited thick coatings of V2O5 on Ni foam as binder free electrodes for supercapacitors ASMA AAMIR1, ADIL AHMAD2,3, YAQOOB KHAN3, ZIA-UR-REHMAN1,* , NOOR UL AIN1, SAID KARIM SHAH2, MAZHAR MEHMOOD4 and BILAL ZAMAN5 1
Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan Department of Physics, Faculty of Physical and Numerical Sciences, Abdul Wali Khan University, Mardan 23200, Pakistan 3 Nanosciences and Technology Department, National Centre for Physics, QAU Campus, Islamabad 45320, Pakistan 4 National Centre for Nanotechnology, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad 45650, Pakistan 5 College of Material Science and Chemical Engineering, Hainan University, Haikou 570228, China *Author for correspondence ([email protected]) 2
MS received 18 February 2020; accepted 7 August 2020 Abstract. 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 current collector 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. This study reports thick electrodeposits of vanadium pentoxide (V2O5) on nickel foam substrate and its evaluation as supercapacitor electrode material. Vanadium pentoxide with thickness of 3–5 lm were successfully electrodeposited (potentiostatically and galvanostatically) on metallic nickel foam to obtain potentiostatically electrodeposited V2O5 on nickel foam (PE-V2O5Ni) and galvanostatically electrodeposited V2O5 on nickel foam (GE-V2O5Ni), respectively. The PEV2O5Ni electrode with layered morphologies exhibits more charge storage and discharge capability than spherically dense morphologies of GE-V2O5Ni electrodes. The synthesized electrode materials were structurally, morphologically and chemically characterized through X-ray diffractometer, X-ray photoelectron spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The PE-V2O5Ni and GE-V2O5Ni exhibited gravimetric capacitance of 657 and 421 F g-1 with tremendous stability in the polypropylene carbonate electrolyte. Keywords.
1.
Electrodeposition; vanadium pentoxide; nickel foam; supercapacitors.
Introduction
Energy is prevalent in nature; however, efficient energy storage is one of the most growing demands of the human beings nowadays. In 21st century, the growing global energy demand adjures scientists to search for ecofriendly and low cost energy storing devices that far exceed the existing technologies [1]. In this context, supercapacitor/ultracapacitors are making their presence as one of the most expectant energy storage materials owin
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