Publication

NMSL Lab

Publication

Two dimensional famatinite sheets decorated on reduced graphene oxide: A novel electrode for high performance supercapacitors
Author
Vimal Kumar Mariappan, Karthikeyan Krishnamoorthy, Parthiban Pazhamalai, Surjit Sahoo, Dhanasekar Kesavan, Sang-Jae Kim
Journal
Journal of Power Sources
Page
126648
Year
2019

Abstract

Layered ternary metal chalcogenides and their hybrids are receiving fabulous attention as electrode materials for supercapacitors. Herein, we report a facile one-step hydrothermal preparation of layered famatinite/graphene hybrid-sheets and explored its electrochemical properties as a negative electrode for supercapacitors. The mechanism of formation of 2D/2D hybrid heterostructures comprising famatinite and graphene sheets is discussed using physico-chemical characterization such as X-ray diffraction, Raman spectroscopy, and field emission scanning electron microscopic analyses respectively. The famatinite/graphene hybrid-sheet electrode demonstrates high specific capacitance of about 527.76 F g−1 (specific capacity of 205.24 mAh g−1) which is 5- and 3- fold higher compared to the bare famatinite and graphene electrodes. This astonishing performance of famatinite/graphene hybrid electrode is due to the enhancement of electrolyte ion insertion/extraction kinetics compared to that of bare famatinite and graphene electrodes, as evidenced using Dunn's method. Further, the famatinite/graphene symmetric supercapacitor exhibits an excellent energy density of about 13.45 Wh kg−1 with the maximal power density of 1250 W kg−1. Additionally, famatinite/graphene symmetric supercapacitor displays high cyclic stability of 95.5% with marvellous rate capability, indicating great promise towards the commercialization of energy storage device.