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Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors

There is much recent interest in graphene-based composite electrode materials because of their excellent mechanical strengths, high electron mobilities, and large specific surface areas. These materials are good candidates for applications in supercapacitors. In this work, a new graphene-based elect...

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Autores principales: Dang, Yong-Qiang, Ren, Shao-Zhao, Liu, Guoyang, Cai, Jiangtao, Zhang, Yating, Qiu, Jieshan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5245759/
https://www.ncbi.nlm.nih.gov/pubmed/28335339
http://dx.doi.org/10.3390/nano6110212
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author Dang, Yong-Qiang
Ren, Shao-Zhao
Liu, Guoyang
Cai, Jiangtao
Zhang, Yating
Qiu, Jieshan
author_facet Dang, Yong-Qiang
Ren, Shao-Zhao
Liu, Guoyang
Cai, Jiangtao
Zhang, Yating
Qiu, Jieshan
author_sort Dang, Yong-Qiang
collection PubMed
description There is much recent interest in graphene-based composite electrode materials because of their excellent mechanical strengths, high electron mobilities, and large specific surface areas. These materials are good candidates for applications in supercapacitors. In this work, a new graphene-based electrode material for supercapacitors was fabricated by anchoring carbon dots (CDs) on reduced graphene oxide (rGO). The capacitive properties of electrodes in aqueous electrolytes were systematically studied by galvanostatic charge-discharge measurements, cyclic voltammetry, and electrochemical impedance spectroscopy. The capacitance of rGO was improved when an appropriate amount of CDs were added to the material. The CD/rGO electrode exhibited a good reversibility, excellent rate capability, fast charge transfer, and high specific capacitance in 1 M H(2)SO(4). Its capacitance was as high as 211.9 F/g at a current density of 0.5 A/g. This capacitance was 74.3% higher than that of a pristine rGO electrode (121.6 F/g), and the capacitance of the CD/rGO electrode retained 92.8% of its original value after 1000 cycles at a CDs-to-rGO ratio of 5:1.
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spelling pubmed-52457592017-03-21 Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors Dang, Yong-Qiang Ren, Shao-Zhao Liu, Guoyang Cai, Jiangtao Zhang, Yating Qiu, Jieshan Nanomaterials (Basel) Article There is much recent interest in graphene-based composite electrode materials because of their excellent mechanical strengths, high electron mobilities, and large specific surface areas. These materials are good candidates for applications in supercapacitors. In this work, a new graphene-based electrode material for supercapacitors was fabricated by anchoring carbon dots (CDs) on reduced graphene oxide (rGO). The capacitive properties of electrodes in aqueous electrolytes were systematically studied by galvanostatic charge-discharge measurements, cyclic voltammetry, and electrochemical impedance spectroscopy. The capacitance of rGO was improved when an appropriate amount of CDs were added to the material. The CD/rGO electrode exhibited a good reversibility, excellent rate capability, fast charge transfer, and high specific capacitance in 1 M H(2)SO(4). Its capacitance was as high as 211.9 F/g at a current density of 0.5 A/g. This capacitance was 74.3% higher than that of a pristine rGO electrode (121.6 F/g), and the capacitance of the CD/rGO electrode retained 92.8% of its original value after 1000 cycles at a CDs-to-rGO ratio of 5:1. MDPI 2016-11-14 /pmc/articles/PMC5245759/ /pubmed/28335339 http://dx.doi.org/10.3390/nano6110212 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dang, Yong-Qiang
Ren, Shao-Zhao
Liu, Guoyang
Cai, Jiangtao
Zhang, Yating
Qiu, Jieshan
Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors
title Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors
title_full Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors
title_fullStr Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors
title_full_unstemmed Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors
title_short Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors
title_sort electrochemical and capacitive properties of carbon dots/reduced graphene oxide supercapacitors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5245759/
https://www.ncbi.nlm.nih.gov/pubmed/28335339
http://dx.doi.org/10.3390/nano6110212
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