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Issue 29, 2019
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Electrochemically modified graphite paper as an advanced electrode substrate for supercapacitor application

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Abstract

Herein, a novel advanced electrode substrate, electrochemically modified graphite paper (ECM-GP) having a foam-like structure, was developed via the green electrochemical oxidation/exfoliation of pristine graphite paper (PGP). The exfoliation technique greatly enhanced the specific surface area from 28.6 m2 g−1 for PGP to 560.9 m2 g−1 for ECM-GP with a pore volume of 0.766 cm3 g−1. This structural improvement not only enhanced its capacitance (from 108 mF cm−2 for PGP to 156 mF cm−2 for ECM-GP) but also improved its charge storage kinetics from diffusion-controlled to a capacitive nature. These amazing characteristics of ECM-GP allowed it to be extended as an advanced electrode substrate by electrochemically depositing MoO2 nanoparticles, resulting in a high capacitance value of 1409 mF cm−2 (19.6 F cm−3) at a current density of 2 mA cm−2 with 33.7% retention at a current density of 30 mA cm−2. This capacitance value is very high compared to that of previously reported MoO2-based electrodes and other differently designed electrodes. Electrochemical impedance spectroscopy indicated low charge transfer resistance in ECM-GP and low contact resistance between ECM-GP and MoO2. The designed solid-state symmetric supercapacitor (SSC) using the MoO2-decorated ECM-GP electrode showed a high energy density of 0.212 mW h cm−2 (1.41 mW h cm−3) with a power density of 98.46 mW cm−2 (665.41 mW cm−3).

Graphical abstract: Electrochemically modified graphite paper as an advanced electrode substrate for supercapacitor application

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Supplementary files

Article information


Submitted
30 Apr 2019
Accepted
25 Jun 2019
First published
25 Jun 2019

J. Mater. Chem. A, 2019,7, 17547-17560
Article type
Paper

Electrochemically modified graphite paper as an advanced electrode substrate for supercapacitor application

D. Mandal, P. Routh, A. K. Mahato and A. K. Nandi, J. Mater. Chem. A, 2019, 7, 17547
DOI: 10.1039/C9TA04496E

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