|Title:||Bimetallic vanadium cobalt diselenide nanosheets with additional active sites for excellent asymmetric pseudocapacitive performance: Comparing the electrochemical performances with M-CoSe<inf>2</inf> (M = Zn, Mn, and Cu)||Authors:||Ramaraj, Sukanya
Chen, Shen Ming
|Issue Date:||1-Jan-2019||Journal Volume:||7||Journal Issue:||20||Source:||Journal of Materials Chemistry A||Abstract:||
© 2019 The Royal Society of Chemistry. Recently, bimetallic selenides have been considered as efficient electrocatalysts towards various electrochemical applications. Here, we demonstrated the synthesis of different transition metals (M = V, Zn, Mn, and Cu) incorporated into CoSe2 (M-CoSe2). The pseudocapacitive behaviours of the M-CoSe2 were enhanced due to the introduction of multiple redox properties and greater intrinsic electronic conductivity. Among them, bimetallic V-CoSe2 deposited on nickel foam (V-CoSe2/NF) exhibited a substantial specific surface area, high specific capacitance (1830.2 F g-1 at 1.5 A g-1), long-term cycling stability (118% retention, 5000 cycles) and low internal charge transfer resistance (Rct = 36.74 Ω). Thus, an asymmetric device assembled from V-CoSe2 and activated carbon (AC) exhibited an excellent energy density of 103.03 W h kg-1 at a power density of 1200 W kg-1. In summary, this work presents a new strategy to develop defect-rich transition metal selenides for high energy density supercapacitor devices.
|Appears in Collections:||政治學系|
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