Synergy of zero-dimensional carbon dots decoration on the one-dimensional architecture of Ag-doped V2O5 for supercapacitor and overall water-splitting applications
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2024-01-04
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Elsevier
Abstract
The production of renewable energy sources and energy storage devices is crucial in addressing current global energy challenges. Hydrogen energy is a clean form of energy that can be produced without any harmful by-products. For this purpose, nanorods of vanadium oxide (V2O5) and silver-doped vanadium oxide (Ag/V2O5) were synthesized by hydrothermal route. The carbon dots decorated silver doped vanadium oxide (Ag/V2O5@C) was fabricated using an ultrasonication approach. Various physio-chemical techniques were used to characterize the fabricated samples. The synthesized materials were employed as electrodes and electrocatalysts for supercapacitor and water-splitting applications. Cyclic voltammetry and cyclic charge–discharge experiments were performed, and results showed that Ag/V2O5@C exhibited 936 Fg−1 specific capacitance at 5 mVs−1 and 977 s discharge time. The charge transfer resistance was calculated via electrochemical impedance spectroscopy and Ag/V2O5@C showed a lower charge transfer resistance than other prepared materials. At 10 mAcm−2, Ag/V2O5@C exhibited lower overpotential of 126 mV and 388 mV for hydrogen evolution (HER) and oxygen evolution reactions (OER) respectively. The lower tafel slope of 81 mV dec−1 and 71 mV dec−1 was attributed to the Ag/V2O5@C for HER and OER respectively. Ag/V2O5@C showed higher reaction kinetics due to the fast rate of charge transfer, low resistance, high conductivity, and greater active sites provided by the carbon dots for electrocatalytic reaction. So, Ag/V2O5@C can be employed as an effective electrocatalyst and electrode material for electrochemical applications.
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This is a manuscript of the Article published as Irshad, Amna, Sonia Zulfiqar, Zeid A. Alothman, Imran Shakir, Muhammad Farooq Warsi, and Eric W. Cochran. "Synergy of zero-dimensional carbon dots decoration on the one-dimensional architecture of Ag-doped V2O5 for supercapacitor and overall water-splitting applications." Fuel 362 (2024): 130705.
doi: https://doi.org/10.1016/j.fuel.2023.130705. Posted with Permission. © 2023 Elsevier Ltd.