The influence of carbon nanotubes characteristics in their performance as positive electrodes in vanadium redox flow batteries

被引：30

作者：

Gonzalez, Zoraida ^{[1
]}

Alvarez, Patricia ^{[1
]}

Blanco, Clara ^{[1
]}

Vega-Diaz, Sofia ^{[3
]}

Tristan-Lopez, Ferdinando ^{[3
]}

Rajukumar, Lakshmy Pulickal ^{[2
]}

Cruz-Silva, Rodolfo ^{[3
]}

Elias, Ana Laura ^{[4
]}

Terrones, Mauricio ^{[2
,3
,4
]}

Menendez, Rosa ^{[1
,5
]}

机构：

[1] Inst Nacl Carbon INCAR CSIC, Oviedo 33080, Spain

[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[3] Shinshu Univ, Res Ctr Exot Nanocarbons JST, Wakasato 4-17-1,Nagano, Wakasato, Nagano, Japan

[4] Penn State Univ, Dept Phys & Ctr Dimens & Layered Mat 2, University Pk, PA 16802 USA

[5] Penn State Univ, Dept Chem, University Pk, PA 16802 USA

来源：

SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS | 2015年 / 9卷

关键词：

Vanadium redox flow battery; Carbon nanotube; Crystallinity Chemical composition; Electrochemical activity; Kinetic reversibility;

D O I：

10.1016/j.seta.2014.12.008

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Three types of multi-walled carbon nanotubes are investigated as electrodes in the positive half-cell of a vanadium redox flow battery (VRFB). Pure (MWCNTs), nitrogen-doped (CNxMWNTs) and oxygen functionalized (MWCNT-Cs) carbon nanotubes exhibit significant structural differences at the nanoscale, as well as different chemical and physical properties. The influence of such different characteristics on the electrochemical behavior towards the VO2+/VO2+ redox reactions is investigated by cyclic voltammetry, electrochemical impedance spectroscopy and charge/discharge experiments. MWCNT-Cs exhibit the best performance despite not having the largest specific surface area, neither the greatest amount of oxygen nor nitrogen functional groups on their surface. Therefore, their enhanced performance in terms of electrochemical activity and kinetic reversibility towards the vanadium reactions and energy efficiency of the corresponding static battery, are attributed to the highest sp(2) carbon content, which brings the highest electrical conductivity. These results represent a significant advance in the fundamental understanding and design of effective electrode materials that will lead to more efficient batteries. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：105 / 110

页数：6

共 32 条

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