Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6604183 | Electrochimica Acta | 2018 | 34 Pages |
Abstract
Two-dimensional nanostructured metal chalcogenides have significant consideration as electrode materials for energy storage application owing to their fascinating properties. In this work, we have grown two-dimensional MoSe2 sheets directly on the surface of nickel foam via facile one-step electrochemical deposition method and examined their use as a binder-free electrode for supercapacitor. The physicochemical characterizations such as X-ray diffraction, field emission scanning electron microscope, X-ray photoelectron spectrum, and Raman analysis confirmed the formation of MoSe2 sheets on Ni foam. The effect of deposition time (5 and 10â¯min) on the electrochemical properties of the MoSe2 sheets are examined in detail using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopic analyses, respectively. The cyclic voltammetry profiles confirmed that the charge-storage mechanism in MoSe2 sheets is due to the ion intercalation/de-intercalation kinetics. A high specific capacity of 548â¯mAh gâ1 was obtained for the MoSe2/Ni electrode from CV profile measured using a scan rate of 5â¯mVâ¯sâ1. The MoSe2/Ni electrode delivered a specific capacity of 325.92â¯mAh gâ1 from charge-discharge analysis obtained at constant discharge current density of 4â¯mAâ¯cmâ2 with good cyclic stability. The capacitive properties and the mechanism of charge-storage in the MoSe2/Ni electrode deposited at different time intervals were examined by the electrochemical impedance spectroscopy using Nyquist and Bode phase angle plot. The experimental results ensure that the MoSe2/Ni electrode might be used as the high-performance electrode for the next-generation energy storage devices.
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Authors
Vimal Kumar Mariappan, Karthikeyan Krishnamoorthy, Parthiban Pazhamalai, Surjit Sahoo, Sang-Jae Kim,