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標題: Experimental Study on the All Vanadium Redox Flow Battery Performance Enhancement with Electrode Modifications
作者: 翁家豪
Jia-Hao Weng
關鍵字: Vanadium redox flow battery;Graphite felt modification;Aqua regia;Electric capacity;Energy efficiency;全釩氧化還原液流電池;石墨氈改質;王水;電容量;能量效率
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In this study, effect of electrode modification on the vanadium redox flow battery (VRFB) performance was experimentally investigated. The material used for the electrode is graphite felt (GF) which was modified using chemical method. Three types of acidic solutions, nitric acid, dual acid (solution of nitric and sulfuric acids), and aqua regia (solution of nitric acid and Hydrochloric acids), were used to chemically modifying the electrode surface electrochemical activity by soaking the GF in these solutions. The VRFB performance with pretreated electrode (simply removing impurity) was used as the comparison basis. With the current density of 40 mA/cm2, SiO2 modified Nafion 117 as the membrane, and 1.5M VOSO4 as electrolyte, it was found that the aqua regia soaked GF has the optimal performance with lower electric capacity decay rate and energy efficiency as high as 80%.
Using the aqua regia soaked GF as electrodes, VRFB performance was studied under various current densities, electrolyte flow patterns, and electrolyte concentrations. For the current density varied in the range of 20~80 mA/cm2, it was found that current density of 40 mA/cm2 produces the best results. With electrolyte flow pattern modified by using serpentine and spiral channels, it was found that the flow pattern did not play a significant role in enhancing the VRFB performance. With carbon papers filled in these channels, no improvement in VRFB performance can be found. The reason may be attributed to the reduction in contact area between the electrode and electrolyte. With the electrolyte concentration increased from 1.5M VOSO4 to 3.0M VOSO4, it was found that the electric capacity was doubled while the energy efficiency kept unchanged.

Keywords: Vanadium redox flow battery, Graphite felt modification, Aqua regia, Electric capacity, Energy efficiency

本文為以石墨氈電極改質與電解液流場改良其對全釩氧化還原液流電池(Vanadium Redox Flow Battery, VRFB)性能之影響,進行實驗探討,本研究先更改實驗配置改善電池電容量快速衰退的問題,藉由離子交換膜改質中性能最佳者做後續實驗,在固定電解液、電流密度、離子交換膜對前處理、硝酸改質、混酸改質、王水改質4種不同石墨氈在電流密度40mA/cm2做20次充放電循環實驗。實驗結果發現以Nafion/SiO2改質離子交換膜配合王水改質石墨氈有最佳的性能。同樣的參數比較在電流密度20mA/cm2、80mA/cm2對電池效能的影響,以40mA/cm2為最佳電流密度,由結果可知以Nafion/SiO2改質離子交換膜配合王水改質石墨氈在電流密度40mA/cm2有最高的電容量、約80%的能量效率。
再以上述離子交換膜改質以及石墨氈改質方式對具有螺旋環狀(Spiral Patten)、交叉蛇狀(Serpentine Patterns)流道傳電石墨板之電池做20次充放電循環,但結果不如預期理想,估計原因為流道減少石墨板和石墨氈的接觸面積提高了局部區域的電流密度,進而提高極化程度,後續在流道石墨板中填充碳紙,雖有改善電池性能但仍低於使用無流道石墨板。
最後利用硫酸-鹽酸混合液調配高濃度電解液(3M V4+),配合Nafion/SiO2改質膜、王水改質石墨氈在電流密度40mA/cm2做20次充放電循環實驗,相較於使用一般濃度電解液(1.5M V4+),可提高1.86倍的電容量和小幅度的能量效率。

關鍵字: 全釩氧化還原液流電池、石墨氈改質、王水、電容量、能量效率。
Rights: 同意授權瀏覽/列印電子全文服務,2015-08-31起公開。
Appears in Collections:機械工程學系所

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