High-performance different shape carbon decorated asteroidea-like cobalt diselenide electrode for energy storage device. (15th December 2022)

• Record Type: Journal Article
• Authors: Tanwar, Shweta; Singh, Nirbhay; Sharma, A.L.
• Is Part Of: Fuel. Volume 330(2022)
• Publication Date: 2022-12-15
• Subjects: CoSe2 -- Activated carbon -- Nanoflakes -- Hydrothermal -- Supercapacitors -- LEDs; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.125602
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: One-step hydrothermal method utilized to synthesize Asteroidea-like cobalt diselenide and its composite with different shape carbon. The CAC electrode-based cell displays a specific capacitance of 886 F g −1 at a scan rate of 10 mV s −1 . CAC electrode-based symmetric cell shows capacitance retention of 80% for 5, 000 cycles. CAC symmetric cell depicts illumination of different color LEDs and its performance remains the same after three months too. Abstract: Presently, the selenides-based transition metal appears to be one of the encouraging materials utilized in energy conservation, and storage applications. In this report, we presented the pure cobalt diselenide (CoSe2 ) and its composite with different shaped carbon using the one-step hydrothermal method. The CoSe2 with activated carbon composite exhibited the highest electrochemical performance among all prepared samples. It depicts retention of capacitance at around 80 % for 5000 cycles. A symmetric device prototype cell has been designed using a CoSe2 /activated carbon composite electrode which displays the highest specific energy and power density as 83 Wh kg −1 at 1622 W kg −1 . The maximum specific capacitance displayed by it is 886 F g −1 for a constant 10 mV s −1 Further, a possible charge storage mechanism related to the fabricated cell is proposed. The fabricated device application in practical life has been tested via a glowing panel containing 17 light-emitting diodes (LEDs) and its performance remains the same after six months too. The noteworthy improved capacity, good cycling stability, and high specific energy for the CoSe2 with activated carbon composite material is possibly considered a potential candidate for energy storage devices, and portable electronics.