以無患子水溶液為鋅空氣燃料電池電解液之研究

The Study of Sapindus Solution to Electrolyte for Zinc-air Fuel Cell

周非凡(Fei-Fan Chou)

指導教授 ： 林維新

共同指導教授 ： 黃英邦(Ing-bang Huang)

國立虎尾科技大學/工程學院/創意工程與精密科技研究所/碩士(2011年)

https://doi.org/10.6827/NFU.2011.00159

摘要

本研究以鋅板作為陽極，具孔洞之鋁板作為燃料電池之集電板，以相同比例之擴散層及不同比例之催化層組成空氣極，擴散層結構分別為活性碳+聚四氟乙烯(PTFE)，及石墨+聚四氟乙烯(PTFE)；催化層結構成分為活性碳+二氧化錳(MnO2)+聚四氟乙烯(PTFE)，及石墨+二氧化錳(MnO2)+ 聚四氟乙烯(PTFE)，無患子水溶液為電解液，並用電腦輔助製造技術製作電池殼，組成一新穎之鋅空氣燃料電池，以動電位法及定電流法進行電池性能測試。實驗結果得知：空氣極以石墨為主要材料時相較於以活性碳為主要材料時具有較高功率密度。經定電流放電24小時後，以石墨為主之空氣極相較於以活性碳為主之空氣極放電曲線較為平穩，兩者開路電位約為0.45V。
鋅在無患子、氫氧化鉀及氫氧化鈉水溶液之腐蝕行為則以動態極化法進行測試，實驗得知：鋅在無患子水溶液之腐蝕電位約為-1.03V有朝貴電位(noble potential)移動之趨勢，而腐蝕電流密度則下降之趨勢，顯示出鋅在無患子水溶液相較於鋅在氫氧化鉀水溶液及氫氧化鈉水溶液下具有較佳抗蝕性。雖然鹼性鋅空氣燃料電池有高電池效率，但使用後處理不當會導致環境破壞，故無患子液做為電解液是有助於環境保護及發展性。

關鍵字

鋅空氣燃料電池 ； 無患子 ； 腐蝕 ； 動態極化

並列摘要

In this study, a zinc-air fuel cell consists of a zinc plate served as anode and aluminum hole-plate used as collector of air-electrode, which have the same composition ratio diffusion layer and different composition ratio catalyst layers. Diffusion layer structures were activated carbon plus PTFE and graphite plus PTFE, respectively. Catalyst layer structures were activated carbon plus MnO2 plus PTFE and graphite plus MnO2 plus PTFE, respectively. A novel zinc-air fuel cell consists of a zinc plate served as anode and aluminum hole-plate used as collector of air-electrode. Sapindus aqueous solution as electrolyte, and shells of fuel cell are made by the computer-aided design and manufacturing technology. Cell performance was conducted by potentiodynamic polarization and constant current methods. The results showed that when the main material is graphite of the air-electrode, that power density is higher than activated carbon. The main material is graphite of the air-electrode that the curve of discharge is smoother than activated carbon after 24 hours of constant current discharging. Both of the open circuit potential is about 0.45V.
The corrosion behavior of the zinc plate in sapindus, sodium hydroxide (NaOH) and the potassium hydroxide (KOH) solution was investigated by using potentiodynamic polarization technique, respectively. Results showed that the corrosion potential of zinc plate in sapindus solution was shift toward more noble potential indicating better performance than the potassium hydroxide (KOH) and sodium hydroxide solution. Although zinc-air fuel cell with basic electrolyte has high cell efficiency, but the handling of electrolyte after work will damage the environment. Therefore, sapindus solution as electrolyte is friendly for environment protection and developmental.

並列關鍵字

Zinc-air fuel cell ； Sapindus ； Corrosion ； Potentialdynamic polarization

參考文獻

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