Mn3O4 anchored on carbon nanotubes as an electrode reaction catalyst of V(IV)/V(V) couple for vanadium redox flow batteries
Mn3O4 anchored on carbon nanotubes as an electrode reaction catalyst of V(IV)/V(V) couple for vanadium redox flow batteries
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DOI：
10.1016/j.electacta.2015.07.067
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发表时间：
2015-09-10
影响因子：
6.6
通讯作者：
Li, Chuanchang
中科院分区：
文献类型：
--
作者：
He, Zhangxing;Dai, Lei;Li, Chuanchang
采用溶剂热法制备了Mn 3 O 4/MWCNTs（多壁碳纳米管）复合材料，并将其作为钒液流电池中V（IV）/V（V）氧化还原对的电化学催化剂。电化学催化剂（Mn 3 O 4、MWCNTs、Mn 3 O 4/MWCNTs）均能提高V（IV）/V（V）氧化还原对的电化学活性，其电催化动力学顺序为Mn 3 O 4/MWCNTs > MWCNTs > Mn 3 O 4。组装了以Mn 3 O 4/MWCNTs复合材料为电化学催化剂的电池，并对其充放电性能进行了评价。与纯电池相比，采用Mn 3 O 4/MWCNTs改性石墨毡正极的电池具有较低的电化学极化、较大的放电容量和能量效率。使用改性正极的电池50次循环的平均能量效率为84.65%，比未改性正极的电池提高了3.73%。Mn 3 O 4/MWCNTs复合材料的上级电催化性能主要是由于有效的混合导电网络，促进了电极/电解质界面的电子传递和离子扩散。(C)2015爱思唯尔有限公司版权所有。
Mn3O4/MWCNTs (multi-walled carbon nanotubes) composite fabricated by a simple solvothermal method was developed as electrochemical catalyst of V(IV)/V(V) redox couple for vanadium redox flow batteries. The electrochemical activity of V(IV)/V(V) redox couple can be enhanced by the electrochemical catalysts (Mn3O4, MWCNTs, Mn3O4/MWCNTs), and the electrocatalytic kinetics of the redox reactions were in the order of Mn3O4/MWCNTs > MWCNTs > Mn3O4. The cell using Mn3O4/MWCNTs composite as electrochemical catalyst was assembled and the charge-discharge performance was evaluated. Compared with the pristine cell, the cell using positive graphite felt modified by Mn3O4/MWCNTs had lower electrochemical polarization, larger discharge capacity and energy efficiency. The average energy efficiency of the cell using modified positive electrode for 50 cycles was 84.65%, 3.73% higher than that of the pristine cell. The superior electrocatalytic performance of Mn3O4/MWCNTs composite was mainly due to the effective mixed conducting network, facilitating the electron transport and ion diffusion in the electrode/electrolyte interface. (C) 2015 Elsevier Ltd. All rights reserved.