Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

Abstract Herein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2....

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Autores principales:	Jeongpil Kim, Jeong-Hyun Eum, Junhyeok Kang, Ohchan Kwon, Hansung Kim, Dae Woo Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6837eac0116b4192a779ac93851bc3a5
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spelling	oai:doaj.org-article:6837eac0116b4192a779ac93851bc3a52021-12-02T15:23:47ZTuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor10.1038/s41598-021-81759-72045-2322https://doaj.org/article/6837eac0116b4192a779ac93851bc3a52021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81759-7https://doaj.org/toc/2045-2322Abstract Herein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2. The prepared graphene powder comprised abundant slit nanopores and micropores, showing a large specific surface area of 653.2 m2/g with a microporous surface area of 367.2 m2/g under optimized conditions. The pore structure was easily tunable by controlling the oxidation degree of GO and by the second annealing process. When the graphene powder was used as the supercapacitor electrode, a specific capacitance of 372.1 F/g was achieved at 0.5 A/g in 1 M H2SO4 electrolyte, which is a significantly enhanced value compared to that obtained using activated carbon and commercial reduced GO. The performance of the supercapacitor was highly stable, showing 103.8% retention of specific capacitance after 10,000 cycles at 10 A/g. The influence of pore structure on the supercapacitor performance was systematically investigated by varying the ratio of micro- and external surface areas of graphene.Jeongpil KimJeong-Hyun EumJunhyeok KangOhchan KwonHansung KimDae Woo KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jeongpil Kim Jeong-Hyun Eum Junhyeok Kang Ohchan Kwon Hansung Kim Dae Woo Kim Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor
description	Abstract Herein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2. The prepared graphene powder comprised abundant slit nanopores and micropores, showing a large specific surface area of 653.2 m2/g with a microporous surface area of 367.2 m2/g under optimized conditions. The pore structure was easily tunable by controlling the oxidation degree of GO and by the second annealing process. When the graphene powder was used as the supercapacitor electrode, a specific capacitance of 372.1 F/g was achieved at 0.5 A/g in 1 M H2SO4 electrolyte, which is a significantly enhanced value compared to that obtained using activated carbon and commercial reduced GO. The performance of the supercapacitor was highly stable, showing 103.8% retention of specific capacitance after 10,000 cycles at 10 A/g. The influence of pore structure on the supercapacitor performance was systematically investigated by varying the ratio of micro- and external surface areas of graphene.
format	article
author	Jeongpil Kim Jeong-Hyun Eum Junhyeok Kang Ohchan Kwon Hansung Kim Dae Woo Kim
author_facet	Jeongpil Kim Jeong-Hyun Eum Junhyeok Kang Ohchan Kwon Hansung Kim Dae Woo Kim
author_sort	Jeongpil Kim
title	Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor
title_short	Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor
title_full	Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor
title_fullStr	Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor
title_full_unstemmed	Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor
title_sort	tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6837eac0116b4192a779ac93851bc3a5
work_keys_str_mv	AT jeongpilkim tuningthehierarchicalporestructureofgrapheneoxidethroughdualthermalactivationforhighperformancesupercapacitor AT jeonghyuneum tuningthehierarchicalporestructureofgrapheneoxidethroughdualthermalactivationforhighperformancesupercapacitor AT junhyeokkang tuningthehierarchicalporestructureofgrapheneoxidethroughdualthermalactivationforhighperformancesupercapacitor AT ohchankwon tuningthehierarchicalporestructureofgrapheneoxidethroughdualthermalactivationforhighperformancesupercapacitor AT hansungkim tuningthehierarchicalporestructureofgrapheneoxidethroughdualthermalactivationforhighperformancesupercapacitor AT daewookim tuningthehierarchicalporestructureofgrapheneoxidethroughdualthermalactivationforhighperformancesupercapacitor
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Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

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