Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte

Phosphorus-doped hierarchically porous carbon (HPC) is prepared with the assistance of freeze-drying using colloid silica and phytic acid dipotassium salt as a hard template and phosphorus source, respectively. Intensive material characterizations show that the freeze-drying process can effectively...

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Autores principales:	Xiaozhong Wu, Xinping Yang, Wei Feng, Xin Wang, Zhichao Miao, Pengfei Zhou, Jinping Zhao, Jin Zhou, Shuping Zhuo
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hierarchically porous carbon energy density supercapacitor current density freeze-drying Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/7142e4ad2e914d1a9febb3b54484984f
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spelling	oai:doaj.org-article:7142e4ad2e914d1a9febb3b54484984f2021-11-25T18:30:13ZEnhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte10.3390/nano111128382079-4991https://doaj.org/article/7142e4ad2e914d1a9febb3b54484984f2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2838https://doaj.org/toc/2079-4991Phosphorus-doped hierarchically porous carbon (HPC) is prepared with the assistance of freeze-drying using colloid silica and phytic acid dipotassium salt as a hard template and phosphorus source, respectively. Intensive material characterizations show that the freeze-drying process can effectively promote the porosity of HPC. The specific surface area and P content for HPC can reach up to 892 m<sup>2</sup> g<sup>−1</sup> and 2.78 at%, respectively. Electrochemical measurements in aqueous KOH and H<sub>2</sub>SO<sub>4</sub> electrolytes reveal that K<sup>+</sup> of a smaller size can more easily penetrate the inner pores compared with SO<sub>4</sub><sup>2</sup><sup>−</sup>, while the developed microporosity in HPC is conducive to the penetration of SO<sub>4</sub><sup>2−</sup>. Moreover, P-doping leads to a high operation potential of 1.5 V for an HPC-based symmetric supercapacitor, resulting in an enhanced energy density of 16.4 Wh kg<sup>−1</sup>. Our work provides a feasible strategy to prepare P-doped HPC with a low dosage of phosphorus source and a guide to construct a pore structure suitable for aqueous H<sub>2</sub>SO<sub>4</sub> electrolyte.Xiaozhong WuXinping YangWei FengXin WangZhichao MiaoPengfei ZhouJinping ZhaoJin ZhouShuping ZhuoMDPI AGarticlehierarchically porous carbonenergy densitysupercapacitorcurrent densityfreeze-dryingChemistryQD1-999ENNanomaterials, Vol 11, Iss 2838, p 2838 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hierarchically porous carbon energy density supercapacitor current density freeze-drying Chemistry QD1-999
spellingShingle	hierarchically porous carbon energy density supercapacitor current density freeze-drying Chemistry QD1-999 Xiaozhong Wu Xinping Yang Wei Feng Xin Wang Zhichao Miao Pengfei Zhou Jinping Zhao Jin Zhou Shuping Zhuo Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte
description	Phosphorus-doped hierarchically porous carbon (HPC) is prepared with the assistance of freeze-drying using colloid silica and phytic acid dipotassium salt as a hard template and phosphorus source, respectively. Intensive material characterizations show that the freeze-drying process can effectively promote the porosity of HPC. The specific surface area and P content for HPC can reach up to 892 m<sup>2</sup> g<sup>−1</sup> and 2.78 at%, respectively. Electrochemical measurements in aqueous KOH and H<sub>2</sub>SO<sub>4</sub> electrolytes reveal that K<sup>+</sup> of a smaller size can more easily penetrate the inner pores compared with SO<sub>4</sub><sup>2</sup><sup>−</sup>, while the developed microporosity in HPC is conducive to the penetration of SO<sub>4</sub><sup>2−</sup>. Moreover, P-doping leads to a high operation potential of 1.5 V for an HPC-based symmetric supercapacitor, resulting in an enhanced energy density of 16.4 Wh kg<sup>−1</sup>. Our work provides a feasible strategy to prepare P-doped HPC with a low dosage of phosphorus source and a guide to construct a pore structure suitable for aqueous H<sub>2</sub>SO<sub>4</sub> electrolyte.
format	article
author	Xiaozhong Wu Xinping Yang Wei Feng Xin Wang Zhichao Miao Pengfei Zhou Jinping Zhao Jin Zhou Shuping Zhuo
author_facet	Xiaozhong Wu Xinping Yang Wei Feng Xin Wang Zhichao Miao Pengfei Zhou Jinping Zhao Jin Zhou Shuping Zhuo
author_sort	Xiaozhong Wu
title	Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte
title_short	Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte
title_full	Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte
title_fullStr	Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte
title_full_unstemmed	Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte
title_sort	enhanced energy density for p-doped hierarchically porous carbon-based symmetric supercapacitor with high operation potential in aqueous h<sub>2</sub>so<sub>4</sub> electrolyte
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7142e4ad2e914d1a9febb3b54484984f
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Enhanced Energy Density for P-Doped Hierarchically Porous Carbon-Based Symmetric Supercapacitor with High Operation Potential in Aqueous H<sub>2</sub>SO<sub>4</sub> Electrolyte

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