High Performance Pseudocapacitor Electrode Materials Based on CoCl2 Doped Graphene Quantum Dots

Kumar, Akshay and Sharma, Raj Kishore and Singh, Gurmeet and Umapathy, Siva and Kharangarh, Poonam Rani (2017) High Performance Pseudocapacitor Electrode Materials Based on CoCl2 Doped Graphene Quantum Dots. In: EMERGING MATERIALS RESEARCH, 6 (2).

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Abstract

This work reports, for the first time, an effective synthesis of CoCl2 doped graphene quantum dots (COCl2-GQDs). Excellent results were obtained by using CoCl2 powder and graphene oxide (GO) as source materials in a facile hydrothermal process. The prepared materials were characterized by using high resolution Transmission Electron Microscopy (HRTEM), Raman Spectroscopy, U-V Visible spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Powder X-Ray Diffraction (PXRD) and Photoluminescence (PL). HRTEM images suggest that the majority of the CoCl2-GQDs are in the narrow range of 2.5-7 nm in diameter, much smaller than that of GQDs which are approximately 15 nm. By using different excitation energy in PL, the appearance of peak introduces additional energy level between pi and pi*, reinforcing the COCl2 doping process. We observed that CoCl2 electrodes can exhibit a reversible redox reaction of Co2+ <-> Co4+ on the electrode and show specific pseudocapacitance of similar to 300F/g. The new charge storage mechanism by using CoCl2 electrodes are easily scalable and highly economical for future pseudocapacitors which can be extended for a large variety of commercial inorganic salt electrodes.

Item Type:	Journal Article
Publication:	EMERGING MATERIALS RESEARCH
Additional Information:	Copy right for this article belongs to the ICE PUBLISHING, INST CIVIL ENGINEERS, 1 GREAT GEORGE ST, WESTMINISTER SW 1P 3AA, ENGLAND
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	16 Sep 2017 05:50
Last Modified:	16 Sep 2017 05:50
URI:	http://eprints.iisc.ac.in/id/eprint/57835

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