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Title: | Single-step synthesis of core-shell diamond-graphite hybrid nano-needles as efficient supercapacitor electrode | Authors: | Banerjee, Debosmita Sankaran, Kamatchi Jothiramalingam Deshmukh, Sujit Yeh, Chien-Jui Gupta, Mukul Lin, I-Nan HAENEN, Ken Kanjilal, Aloke Sinha Roy, Susanta |
Issue Date: | 2021 | Publisher: | PERGAMON-ELSEVIER SCIENCE LTD | Source: | ELECTROCHIMICA ACTA, 397 (Art N° 139267) | Abstract: | Single-step synthesis of core-shell diamond-graphite hybrid electrodes is demonstrated by a mere variation of CH4 concentration (CC) in the microwave growth plasma. The excellent electrochemical stability of diamond and high surface area/electrical conductivity of graphite make the hybrid electrode suitable for supercapacitor application. The supercapacitor study of the hybrid electrode is carried out using both aqueous and redox species contained electrolytes. A brilliant supercapacitor performance (specific capacitance 0.19 F cm(-2)) with high energy and power density and remarkable electrode retention (96% after 10,000 cycles) is obtained and discussed in the light of different electrochemical techniques such as cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The supercapacitor performance is explained by analyzing the microstructural evolution of diamond films from a well-faceted geometry dominated with pure diamond phase to an entirely different needle-like structure having diamond-graphite mixed phase. The CC-dependent phase transition is confirmed by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy study. Finally, the core-shell structure of the hybrid nano-needles is confirmed by transmission electron microscopy investigations. (C) 2021 Published by Elsevier Ltd. | Notes: | Roy, SS (corresponding author), Shiv Nadar Univ, Sch Nat Sci, Dept Phys, NH-91, Gautam Buddha Nagar 201314, Uttar Pradesh, India. susanta.roy@snu.edu.in |
Keywords: | Supercapacitor;Diamond-graphite hybrid;Nano-needles;Core-shell structure;Electrochemical | Document URI: | http://hdl.handle.net/1942/35899 | ISSN: | 0013-4686 | e-ISSN: | 1873-3859 | DOI: | 10.1016/j.electacta.2021.139267 | ISI #: | WOS:000705876700005 | Rights: | 2021 Published by Elsevier Ltd. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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