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Ultrahigh-rate Supercapacitors Based on 2-Dimensional, 1T MoS2xSe2(1-x) for AC Line-Filtering Applications Anju Sellam, Ramesh Naidu Jenjeti, and Srinivasan Sampath J. Phys. Chem. C, Just Accepted Manuscript • DOI: 10.1021/acs.jpcc.8b01593 • Publication Date (Web): 29 Mar 2018 Downloaded from http://pubs.acs.org on March 29, 2018
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The Journal of Physical Chemistry
Ultrahigh-rate Supercapacitors Based on 2-Dimensional, 1T MoS2xSe2(1-x) for AC Line-Filtering Applications
A. Sellam*, Ramesh Naidu Jenjeti and S. Sampath* Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore-560012, India
E-mail: S Sampath:
[email protected]; Fax: +91 80 23600085; Tel: +91 80 2293315; A. Sellam:
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ABSTRACT: Motivated by the presence of metallic conductivity in the group VI transition metal dichalcogenides, the supercapacitive performance of 1T phase of molybdenum (MoS2xSe2(1-x)) sulfoselenides is explored. Ultrahigh frequency response (~1.4 kHz) along with excellent electrochemical stability are exhibited by 1T MoS2xSe2(1-x) - based supercapacitors. The S: Se ratio in the mixed chalcogenide is shown to influence the rate performance of the device. High areal capacitances of ~450 µF cm-2 with short RC time constants of ~1.3 – 3.2 ms at 120 Hz are achieved in the case of 1T MoSSe phase. The i-v characteristics are almost rectangular at very high scan rates of ~1000 V s-1. Very stable gravimetric specific capacitance of ~36 F g-1 is retained for several thousands of charge-discharge cycles leading to energy density of ~12.1 Wh kg-1 at a specific power of ~842 W kg-1. The observed specific power of ~50 kW kg-1 at ~1.5 Wh kg-1 energy density makes the sulfoselenide phase capacitors attractive for high power applications without compromising on the energy density.
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The Journal of Physical Chemistry
1. INTRODUCTION Supercapacitors are important energy storage devices of scientific and technological interest due to intermediate properties of high energy densities and high power densities. With long cycle life, they can be exploited for high power applications in electronic gadgets, medical utilities and electric vehicles.1-3 Various forms of carbon-based materials including activated carbon, carbon nano-tubes, carbon nano-fibers, graphene etc.4-10 have been used to fabricate capacitors. Pseudocapacitance –based electrodes utilize fast and reversible faradaic reactions on the surfaces (for example, transition metal-oxides, conducting polymers etc.) to store electric energy and thus exhibit high specific capacitance.11-14 The response time of a supercapacitor is an important parameter for its utilization in high power applications and a value of 0.56 s has been reported for high surface area aerogel based on carbon fiber.15 Capacitive behavior at high scan rate of > 8 V s-1 has been reported with carbonnanoonions-based supercapacitors.16 Xu et. al have reported high rate performance (
