Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes

Value creation through waste recycling is important for a sustainable society and future. In particular, biomass, which is based on crops, is a great recyclable resource that can be converted into useful materials. Black tea is one of the most cultivated agricultural products in the world and is mos...

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Autores principales:	Hojong Eom, Jooyoung Kim, Inho Nam, Sunyoung Bae
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	black tea carbon biomass energy storage materials supercapacitors Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/2bdbba7ae4b44107a32777904e235ac9
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spelling	oai:doaj.org-article:2bdbba7ae4b44107a32777904e235ac92021-11-11T18:07:59ZRecycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes10.3390/ma142165921996-1944https://doaj.org/article/2bdbba7ae4b44107a32777904e235ac92021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6592https://doaj.org/toc/1996-1944Value creation through waste recycling is important for a sustainable society and future. In particular, biomass, which is based on crops, is a great recyclable resource that can be converted into useful materials. Black tea is one of the most cultivated agricultural products in the world and is mostly discarded after brewing. Herein, we report the application of black tea waste biomass as electrode material for supercapacitors through the activation of biomass hydrochar under various conditions. Raw black tea was converted into hydrochar via a hydrothermal carbonization process and then activated with potassium hydroxide (KOH) to provide a large surface area and porous structure. The activation temperature and ratio of KOH were controlled to synthesize the optimal black tea carbon (BTC) with a large surface area and porosity suitable for use as electrode material. This method suggests a direction in which the enormous amount of biomass, which is simply discarded, can be utilized in the energy storage system. The synthesized optimal BTC has a large surface area of 1062 m<sup>2</sup> and specific capacitance up to 200 F∙g<sup>−1</sup> at 1 mV∙s<sup>−1</sup>. Moreover, it has 98.8% retention of charge–discharge capacitance after 2000 cycles at the current density of 5 A∙g<sup>−1</sup>.Hojong EomJooyoung KimInho NamSunyoung BaeMDPI AGarticleblack tea carbonbiomassenergy storage materialssupercapacitorsTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6592, p 6592 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	black tea carbon biomass energy storage materials supercapacitors Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	black tea carbon biomass energy storage materials supercapacitors Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Hojong Eom Jooyoung Kim Inho Nam Sunyoung Bae Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes
description	Value creation through waste recycling is important for a sustainable society and future. In particular, biomass, which is based on crops, is a great recyclable resource that can be converted into useful materials. Black tea is one of the most cultivated agricultural products in the world and is mostly discarded after brewing. Herein, we report the application of black tea waste biomass as electrode material for supercapacitors through the activation of biomass hydrochar under various conditions. Raw black tea was converted into hydrochar via a hydrothermal carbonization process and then activated with potassium hydroxide (KOH) to provide a large surface area and porous structure. The activation temperature and ratio of KOH were controlled to synthesize the optimal black tea carbon (BTC) with a large surface area and porosity suitable for use as electrode material. This method suggests a direction in which the enormous amount of biomass, which is simply discarded, can be utilized in the energy storage system. The synthesized optimal BTC has a large surface area of 1062 m<sup>2</sup> and specific capacitance up to 200 F∙g<sup>−1</sup> at 1 mV∙s<sup>−1</sup>. Moreover, it has 98.8% retention of charge–discharge capacitance after 2000 cycles at the current density of 5 A∙g<sup>−1</sup>.
format	article
author	Hojong Eom Jooyoung Kim Inho Nam Sunyoung Bae
author_facet	Hojong Eom Jooyoung Kim Inho Nam Sunyoung Bae
author_sort	Hojong Eom
title	Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes
title_short	Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes
title_full	Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes
title_fullStr	Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes
title_full_unstemmed	Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes
title_sort	recycling black tea waste biomass as activated porous carbon for long life cycle supercapacitor electrodes
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2bdbba7ae4b44107a32777904e235ac9
work_keys_str_mv	AT hojongeom recyclingblackteawastebiomassasactivatedporouscarbonforlonglifecyclesupercapacitorelectrodes AT jooyoungkim recyclingblackteawastebiomassasactivatedporouscarbonforlonglifecyclesupercapacitorelectrodes AT inhonam recyclingblackteawastebiomassasactivatedporouscarbonforlonglifecyclesupercapacitorelectrodes AT sunyoungbae recyclingblackteawastebiomassasactivatedporouscarbonforlonglifecyclesupercapacitorelectrodes
_version_	1718431933379117056

Recycling Black Tea Waste Biomass as Activated Porous Carbon for Long Life Cycle Supercapacitor Electrodes

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