Bismuth Nanoparticle Decorating Graphite Felt as a High-Performance Electrode for an All-Vanadium Redox Flow Battery
Bismuth Nanoparticle Decorating Graphite Felt as a High-Performance Electrode for an All-Vanadium Redox Flow Battery
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DOI：
10.1021/nl400223v
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发表时间：
2013-03-01
期刊：
影响因子：
10.8
通讯作者：
Wang, Wei
中科院分区：
文献类型：
--
作者：
Li, Bin;Gu, Meng;Wang, Wei
采用含Bi 3+的电解液，在全钒氧化还原液流电池（VRFB）运行过程中，将铋纳米颗粒同步电沉积到石墨毡电极表面。研究了Bi纳米粒子对VRFB电化学性能的影响。确认Bi仅存在于负电极处并且促进V（II）和V（III）之间的氧化还原反应。然而，Bi纳米颗粒通过增强缓慢的V（II）/V（III）氧化还原反应的动力学，特别是在高功率操作下，显著改善了VRFB电池的电化学性能。在高电流密度（150 mA.cm（-2））下，由于与不含Bi的情况相比更快的电荷转移，能量效率提高了11%。结果表明，使用Bi纳米颗粒代替贵金属作为VRFB应用的高性能电极提供了很大的希望。
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.cm(-2)) 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.