含磷活性炭作为双电层电容器电极材料的电化学性能

引用本文: 王永芳, 左宋林. 含磷活性炭作为双电层电容器电极材料的电化学性能[J]. 物理化学学报, 2016, 32(2): 481-492. doi: 10.3866/PKU.WHXB201511041 shu

Citation: WANG Yong-Fang, ZUO Song-Lin. Electrochemical Properties of Phosphorus-Containing Activated Carbon Electrodes on Electrical Double-Layer Capacitors[J]. Acta Physico-Chimica Sinica, 2016, 32(2): 481-492. doi: 10.3866/PKU.WHXB201511041 shu

含磷活性炭作为双电层电容器电极材料的电化学性能

王永芳 ,
左宋林 ^,

1.
南京林业大学化学工程学院, 江苏省生物质绿色燃料与化学品重点实验室, 南京 210037

通讯作者: 左宋林

基金项目:
国家自然科学基金(31270621) (31270621)

国家林业局948引进项目(2012-4-08)资助 (2012-4-08)

摘要: 采用磷酸活化和磷酸改性制备了不同种类的含磷活性炭,采用元素分析、X射线光电子能谱(XPS)和氮气吸附等手段分析了活性炭的元素含量、表面化学性质和孔隙结构,采用恒电流充放电、循环伏安和交流阻抗分别考察了活性炭在KOH和H₂SO₄电解质溶液中作为超级电容器电极材料的电化学性能,采用自由截距多元线性回归拟合统计分析研究了活性炭电极比电容量的影响因素,应用三电极体系分析了磷元素对活性炭电化学性能的影响机理。研究结果表明,活性炭掺杂的磷引入了赝电容,提高了活性炭电极的比电容量,磷元素含量为5.88%(w)的活性炭的比电容量在0.1 A·g^-1下达到185 F·g^-1。统计分析结果显示,活性炭的中孔有利于电解质离子向微孔内的扩散。在6 mol·L^-1 KOH电解质溶液中,孔径在1.10-1.61 nm、2.12-2.43nm及3.94-4.37 nm范围内是电解质离子在活性炭孔隙内部形成双电层的主要场所;在1 mol·L^-1 H₂SO₄电解质溶液中,孔径在0.67-0.72 nm范围内有利于双电层电容的形成。

关键词:

English

Electrochemical Properties of Phosphorus-Containing Activated Carbon Electrodes on Electrical Double-Layer Capacitors

WANG Yong-Fang ,
ZUO Song-Lin ^,

1.
Jiangsu Key Laboratory of Biomass-based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, P. R. China

Corresponding author: 左宋林

Received Date: 30 June 2015
Fund Project:
国家自然科学基金(31270621)

国家林业局948引进项目(2012-4-08)资助

Abstract: Different kinds of phosphorus-containing activated carbons were prepared by phosphoric acid activation of lignocellulosic precursor and modification with H₃PO₄. Elemental analysis, X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption were employed to analyze the elemental content, surface chemistry, and pore structures of the activated carbons. The electrochemical properties of the carbon materials were characterized for their application as supercapacitors in KOH and H₂SO₄ electrolytes using galvanostatic charge/discharge, cyclic voltammetry, and electrochemical impedance spectroscopic analyses. A statistical analysis by an intercept-free multiple linear regression method was employed to investigate the factors that influence the specific capacitance of activated carbon electrodes. In addition, a three-electrode cell setup was used to analyze the cause of the phosphorus contribution on capacitance. The results show that phosphorus increases the specific capacitance of activated carbons by the introduction of pseudo-capacitance; the activated carbon with phosphorus content of 5.88% (w) exhibits a specific capacitance of 185 F·g^-1 at 0.1 A·g^-1. The statistical analysis showed that mesopores facilitate an access of electrolyte ions to the surface of micropores. The pores in the width ranges of 1.10-1.61 nm, 2.12-2.43 nm and 3.94 -4.37 nm benefit the formation of the electric double layer in 6 mol·L^-1 KOH electrolyte; the pores with sizes of 0.67-0.72 nm have a positive effect in 1 mol·L^-1 H₂SO₄ electrolyte.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

含磷活性炭作为双电层电容器电极材料的电化学性能

通讯作者: 左宋林

English

Electrochemical Properties of Phosphorus-Containing Activated Carbon Electrodes on Electrical Double-Layer Capacitors

Corresponding author: 左宋林

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

含磷活性炭作为双电层电容器电极材料的电化学性能

通讯作者: 左宋林

English

Electrochemical Properties of Phosphorus-Containing Activated Carbon Electrodes on Electrical Double-Layer Capacitors

Corresponding author: 左宋林

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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