Ultrahigh Rate Supercapacitor based on Self-Standing Carbon Nanotubes Supported Vertically Aligned MoS 2 Sheets
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.338
Ultrahigh Rate Supercapacitor based on Self-Standing Carbon Nanotubes Supported Vertically Aligned MoS2 Sheets Pranjala Tiwari1, Dawid Janas2, Ramesh Chandra1
1.
2.
Nanoscience Laboratory, Indian Institute of Technology Roorkee, Roorkee 247667, India.
Silesian University of Technology, B. Krzywoustego 4, 44-100 Gliwice, Poland
*Corresponding author E-mail address:
[email protected], [email protected]
Abstract
Recently, two-dimensional layered structures, especially MoS 2 has come out as the most investigated electrode material for batteries and supercapacitors, possessing well preserved in-plane covalent bonding, leading to extraordinary mechanical elasticity within the layers as well as outstanding firmness along the c-axis. The present work is aimed to fabricate vertically aligned edge exposed molybdenum disulfide nanoflakes on the surface of the self-standing hydrophilic carbon nanotubes, using a two-step process involving a chemical route and magnetron sputtering techniques for flexible supercapacitor application. These hybrid heterostructures have been characterized using XRD, FESEM, and cyclic voltammetry. In the aqueous electrolyte of 1M Li2SO4, the symmetric device revealed very high areal capacitance of 182.5 mF/cm2 and 155 mF/cm2, at scan rates of 2 and 5 mV/s, respectively. The device shows high energy density of 365 mWh/cm2. 1
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INTRODUCTION: The fruition in the social economy is directly or indirectly reliable upon the advances made by the scientific committee. In the previous decades, the energy harvesting and storage field, has remained one of the most important inevitable expenses, posing numerous opportunities and challenges. Besides the microgrid energy distribution system, small energy packets are also required on an integrated chip to run thousands of passive components assembled onto it. This IC technology is the primary backbone behind the vast semiconductor industry. Thin-film fabrication has always remained a very important field, where fabricated thin films could be directly used for making optoelectronic devices. As far as electrochemical energy storage application is considered, several material properties dictate the overall charge storage capacity of any material. Some of these characteristics include the type of crystal structure, polymorph/polytype, wettability, electrical conductivity, etc. Passive devices are essential in every electronic circuitry for storing the high electrical energy, with minimal device weighing. The energy and the power requirements of an application determine the type of device to be used in the circuit. As far as rapid charging and discharging rates are needed, supercapacitors have proven to have much superior performance, when comp
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