Premium
Two‐Dimensional Layered Metallic VSe 2 /SWCNTs/rGO Based Ternary Hybrid Materials for High Performance Energy Storage Applications
Author(s) -
Sree Raj K. A.,
Shajahan Afsal S.,
Chakraborty Brahmananda,
Rout Chandra Sekhar
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202000243
Subject(s) - ternary operation , materials science , supercapacitor , density functional theory , quantum capacitance , capacitance , electrolyte , power density , fermi level , nanotechnology , chemical physics , chemistry , electron , computational chemistry , thermodynamics , electrode , power (physics) , physics , computer science , programming language , quantum mechanics
In this work, the ternary hybrid structure VSe 2 /SWCNTs/rGO is reported for supercapacitor applications. The ternary composite exhibits a high specific capacitance of 450 F g −1 in a symmetric cell configuration, with maximum energy density of 131.4 Wh kg −1 and power density of 27.49 kW kg −1 . The ternary hybrid also shows a cyclic stability of 91 % after 5000 cycles. Extensive density functional theory (DFT) simulations on the structure as well as on the electronic properties of the binary hybrid structure VSe 2 /SWCNTs and the ternary hybrid structure VSe 2 /SWCNTs/rGO have been carried out. Due to a synergic effect, there are enhanced density of states near the Fermi level and higher quantum capacitance for the hybrid ternary structure compared to VSe 2 /SWCNTs, leading to higher energy and power density for VSe 2 /SWCNTs/rGO, supporting our experimental observation. Computed diffusion energy barrier of electrolyte ions (K + ) predicts that ions move faster in the ternary structure, providing higher charge storage performance.