Bismuth Nanoparticle Decorating Graphite Felt as a High-Performance Electrode for an All-Vanadium Redox Flow Battery

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• 作者：Bin Li ; Meng Gu ; Zimin Nie ; Yuyan Shao ; Qingtao Luo ; Xiaoliang Wei ; Xiaolin Li ; Jie Xiao ; Chongmin Wang ; Vincent Sprenkle ; Wei Wang
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：March 13, 2013
• 年：2013
• 卷：13
• 期：3
• 页码：1330-1335
• 全文大小：368K
• 年卷期：v.13,no.3(March 13, 2013)
• ISSN：1530-6992

文摘

Employing electrolytes containing Bi³⁺, bismuth nanoparticles are synchronously electrodeposited onto the surface of a graphite felt electrode during operation of an all-vanadium redox flow battery (VRFB). The influence of the Bi nanoparticles on the electrochemical performance of the VRFB is thoroughly investigated. It is confirmed that Bi is only present at the negative electrode and facilitates the redox reaction between V(II) and V(III). However, the Bi nanoparticles significantly improve the electrochemical performance of VRFB cells by enhancing the kinetics of the sluggish V(II)/V(III) redox reaction, especially under high power operation. The energy efficiency is increased by 11% at high current density (150 mA路cm^鈥?) owing to faster charge transfer as compared with one without Bi. The results suggest that using Bi nanoparticles in place of noble metals offers great promise as high-performance electrodes for VRFB application.

Keywords:

Energy storage; redox flow battery; electrode; catalyst; vanadium