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In-situ single electrode studies of an all-vanadium redox flow battery

机译：全钒氧化还原液流电池的原位单电极研究

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摘要

We use polarization curves and a dynamic hydrogen reference electrode (DHE) to study the effects of electrode material and state of charge on all-vanadium redox flow battery (VRB) performance. The current trend in studying these systems is to evaluate new materials or designs based on voltage, charge and power efficiency metrics. However, such characterization does not allude to which processes may be limiting performance or which electrode dominates performance loss. At moderate state of charge, the negative electrode dominated cell overpotential at all current densities. As state of charge increased, the overpotential was dominated less by the negative electrode. Thicker carbon paper showed better performance while partially wet-proofed carbon paper had a negative impact on performance compared to untreated carbon paper. Through improvements made to the design and materials, VRB power output increased from 77 mW/cm~2 to 404 mW/cm~2.
机译：我们使用极化曲线和动态氢参比电极（DHE）来研究电极材料和电荷状态对全钒氧化还原液流电池（VRB）性能的影响。研究这些系统的当前趋势是基于电压，电荷和功率效率指标来评估新材料或设计。但是，这种表征并未暗示哪些工艺可能会限制性能，或者哪个电极会影响性能。在中等电荷状态下，负极在所有电流密度下都主导着电池的超电势。随着电荷状态的增加，负电极对过电势的控制较少。与未处理的碳纸相比，较厚的碳纸表现出更好的性能，而部分防潮的碳纸对性能产生负面影响。通过改进设计和材料，VRB的功率输出从77 mW / cm〜2增加到404 mW / cm〜2。

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  • 会议地点 Boston MA(US)
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    Douglas S. Aaron; Zhijiang Tang; Jamie S. Lawton; Alexander B. Papandrew; Thomas A. Zawodzinski Jr.;

  • 作者单位

    Chemical and Biomolecuiar Engineering Department, University of Tennessee, Knoxville, TN 37996;

    Chemical and Biomolecuiar Engineering Department, University of Tennessee, Knoxville, TN 37996;

    Chemical and Biomolecuiar Engineering Department, University of Tennessee, Knoxville, TN 37996;

    Chemical and Biomolecuiar Engineering Department, University of Tennessee, Knoxville, TN 37996;

    Chemical and Biomolecuiar Engineering Department, University of Tennessee, Knoxville, TN 37996,Physical Chemistry of Materials Group Oak Ridge National Laboratory, Oak Ridge, TN 37831;

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