High Performance Vanadium Redox Flow Battery Electrodes

IF 2.7 4区工程技术 Q3 ELECTROCHEMISTRY Journal of Electrochemical Energy Conversion and Storage Pub Date : 2023-05-18 DOI:10.1115/1.4062441

Kaycee Gass, Bapi Bera, Doug Aaron, Matthew Mench

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Abstract

Abstract A high temperature ammonia treatment was applied to carbon felt electrodes to enhance vanadium redox flow battery (VRFB) performance. Samples were heated to 900 °C in the presence of ammonia gas for up to 4 h. While all heating times resulted in an overall improvement in current density at 80% voltage efficiency, samples treated for 4 h showed the greatest increase in current density (325%) compared to untreated carbon felt. Raman spectroscopy showed a 74% increase in edge sites as a result of the 4 h treatment. Electrochemical surface area increased by 142% and scanning electron microscopy showed the appearance of pores on felt fiber surfaces, indicating that the performance improvement may be due to enhanced surface area in addition to functionalization. Impedance spectroscopy showed decreased charge transfer resistance and increased durability (during cycling) compared to other published electrode treatments. These results indicate that heated ammonia can be used to increase the performance of electrodes for vanadium flow battery applications, with excellent durability.

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高性能钒氧化还原液流电池电极

摘要采用高温氨法处理碳毡电极，提高了钒氧化还原液流电池(VRFB)的性能。样品在氨气存在下加热到900°C长达4小时。虽然所有加热时间都导致电流密度在80%电压效率下的整体改善，但与未处理的碳毡相比，处理4小时的样品显示电流密度增加最大(325%)。拉曼光谱显示，由于处理4 h，边缘位点增加了74%。电化学表面积增加了142%，扫描电镜显示毛毡纤维表面出现了孔隙，表明除功能化外，毛毡纤维性能的提高可能是由于表面积的增加。阻抗谱显示，与其他已发表的电极处理相比，电荷转移电阻降低，耐用性(在循环期间)增加。这些结果表明，加热氨可以提高钒液流电池电极的性能，并具有优异的耐用性。

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来源期刊

Journal of Electrochemical Energy Conversion and Storage Engineering-Mechanics of Materials

CiteScore

4.90

自引率

4.00%

发文量

期刊介绍： The Journal of Electrochemical Energy Conversion and Storage focuses on processes, components, devices and systems that store and convert electrical and chemical energy. This journal publishes peer-reviewed archival scholarly articles, research papers, technical briefs, review articles, perspective articles, and special volumes. Specific areas of interest include electrochemical engineering, electrocatalysis, novel materials, analysis and design of components, devices, and systems, balance of plant, novel numerical and analytical simulations, advanced materials characterization, innovative material synthesis and manufacturing methods, thermal management, reliability, durability, and damage tolerance.