多孔功能化自支撑碳纤维纸电极用于高性能电容储能

Porous Functionalized Self-Standing Carbon Fiber Paper Electrodes for High-Performance Capacitive Energy Storage.

机构信息

Guanzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology , Guangzhou 510006, China.

School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332-0245, United States.

出版信息

ACS Appl Mater Interfaces. 2017 Apr 19;9(15):13173-13180. doi: 10.1021/acsami.7b01210. Epub 2017 Apr 6.

DOI:10.1021/acsami.7b01210

PMID:28353335

Abstract

A facile and cost-efficient approach to functionalize raw carbon fiber paper (CFP) used for a self-standing capacitive electrode has been proposed here. Benefiting from the improved specific surface area and surface functional groups, the functionalized CFP (F-CFP) showed much enhanced capacitive performance, 3 orders of magnitude higher than that of the raw CFP. It delivered the areal capacitance of 1275 mF cm at 5 mA cm with a rather wide voltage window of 1.4 V (-0.4 to 1 V vs Ag/AgCl) in 0.5 M HSO. However, in a neutral 1 M NaSO aqueous solution, although the areal capacitance of 1115 mF cm at 3 mA cm is slightly smaller, the potential window is much wider (2 V, -1 to 1 V vs Ag/AgCl), indicating a high overpotential of hydrogen evolution. The areal capacitance was still as high as 722 mF cm at a very fast charge-discharge current density of 50 mA cm, and about 66% of the initial capacitance (at 3 mA cm) was remained in NaSO, indicating considerable rate capability.

摘要

这里提出了一种简便且经济高效的方法，可用于对用于自支撑电容电极的原始碳纤维纸（CFP）进行功能化。得益于改进的比表面积和表面官能团，功能化的 CFP（F-CFP）表现出了更高的电容性能，比原始 CFP 高出 3 个数量级。在 0.5 M HSO 中，它在 5 mA cm 的电流密度下具有 1275 mF cm 的面电容，并且具有相当宽的 1.4 V（相对于 Ag/AgCl 为-0.4 至 1 V）的电压窗口。然而，在中性的 1 M NaSO 水溶液中，尽管在 3 mA cm 的电流密度下的面电容略小（1115 mF cm），但是电压窗口要宽得多（2 V，相对于 Ag/AgCl 为-1 至 1 V），这表明析氢的过电势较高。在非常快的充放电电流密度 50 mA cm 下，面电容仍高达 722 mF cm，并且在 NaSO 中保留了初始电容的约 66％（在 3 mA cm 下），表明具有相当高的倍率性能。