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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/80350

    Title: 以不同流場電解液搭配發泡銅網作為鋅空氣電池負極集電網之電化學性質;Using copper foam as anode current collector with different flow field for Zn-based batteries
    Authors: 陳冠聿;Chen, Kuan-Yu
    Contributors: 化學工程與材料工程學系
    Keywords: 鋅空氣電池;發泡銅網;電解液流場;Zn-air batteries;Cu foam;flow field electrolyte
    Date: 2019-08-22
    Issue Date: 2019-09-03 12:35:48 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 以發泡銅網作為鋅空氣電池之負極集電網搭配流場電解液可有效避免鋅枝狀晶於充電反應中產生,並可提高電極之電化學效能。在此研究中,電化學表現的測定均是在以6 M KOH 加入 0.3 M ZnO組成之電解液中施加特定大小之電解液流場速度(RPM)下進行。在鋅沉積形貌的測定部分,使用不同大小之充電電流密度對電極進行充電30分鐘,由SEM觀測結果可知,施加了電解液流場的實驗組相對於未施加流場的實驗組能有效在較高的充電電流密度下避免鋅枝狀晶的產生。另外在循環伏安法測試可看出,施加了電解液流場的實驗組具有較高的氧化電流與庫倫效率,代表電解液流場的施加能有效地提升電極的放電效能。在定電流充放電測試中,以100 mA/cm2之電流密度進行充放電,施加了電解液流場的實驗組有較好的放電效率與循環穩定性,由於發泡銅網具有高比表面積與較高的孔隙度,施加流場的電解液可有效地進入發泡銅網內部,並利用發泡銅網內部面積進行電化學反應,有效電化學反應的增加使每單位面積所分配到的實際電流密度下降,經由以上實驗結果可以說明,發泡銅網在儲能裝置上的應用具有相當大的潛力。;Using copper foam as the current collector in a flowing electrolyte for Zn-air secondary batteries could inhibit dendrite formation and enhance electrochemical performance. In this work, electrochemical analysis was conducted in an alkaline electrolyte composed of 6 M KOH with 0.3 M ZnO under a constant flow field. Zinc was electrodeposited on copper foam at different current density for 30 minutes; the SEM images showed that with the flowing electrolyte, copper foam can be used for Zn plating at a higher current density without dendrite formation. According to the results of cyclic voltammetry, the anodic peak and coulombic efficiency with high rotation speed (RPM) of magnetic stirrer was higher than that without stirring. It indicated that copper foam with flow field electrolyte had a better discharge performance. Constant current density, 100 mA/cm2, was applied for the charge/discharge cyclic test. Copper foam with flow field electrolyte exhibited a better discharge efficiency and superior cycle stability. Because of the high porosity and large specific surface area, the inner area of copper foam could be fully used with the flow field electrolyte. The real current density per unit area decreased and the space of copper foam for zinc deposition increased. Based on these results, it is evident that copper foam shows a high potential as the current collector for energy storage applications.
    Appears in Collections:[化學工程與材料工程研究所] 博碩士論文

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