Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5759
標題: 改質鉑電極觸媒於質子交換膜燃料電池抵抗硫化氫之研究
Enhancing the H2S Tolerance in Proton Membrane Fuel Cells (PMFC) by Modified Pt Electrocatalysts
作者: 林松茂
Lin, Sung-Mao
關鍵字: Proton exchange membrane fuel cell
質子交換膜燃料電池
Electrode catalysts
Bimetallic catalysts
H2S
電極觸媒
雙金屬觸媒
硫化氫
出版社: 環境工程學系所
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摘要: 摘要 質子交換膜燃料電池在陽極觸媒製備上,常以Pt貴金屬用來製備觸媒,但是價格昂貴且數量極其有限。而燃料電池可能受到硫化物毒化使得效能降低,硫化物中尤以H2S的毒化現象最為嚴重。同時近年來的研究中亦發現,以雙金屬合金觸媒抵抗毒化現象的觸媒正被積極的發展中。因此,本研究將選擇價格較低的一般過渡金屬如Zn、V、Cr與Ni等金屬,分別與Pt貴金屬結合製備成雙金屬觸媒,再以鹼金屬Na做進一步的觸媒改質,最後以氫氣還原檢視觸媒毒化後還原之能力。 實驗結果顯示利用針筒塗佈搭配超音波震盪可以較均勻將Pt觸媒分佈在觸媒層上並減少流失。經過電池性能測試於不同操作溫度影響實驗中發現,提升溫度將抑制陰極氧氣在燃料電池中的傳輸而導致效能降低。在室溫下不同金屬觸媒其燃料電池效能大小分別為Pt > Pt-Zn > Pt-V > Pt-Cr > Pt-Ni。另外,在H2S毒化的實驗中發現5ppm H2S會使的雙金屬觸媒性能大幅降低,而選用Pt/Pt、Pt/Pt-Zn觸媒在加入鹼金屬後顯示添加鹼金屬對Pt/Pt-Na可以提升觸媒毒化後還原的效能,而在對於Pt/Pt-Zn-Na觸媒其抵抗能力並不明顯,推測添加鹼金屬於一般過渡金屬上之抵抗H2S之效能並不顯著。
ABSTRACT Nobel metals such as Pt are used to be prepared as the catalyst on the anode in proton exchange membrane fuel cell (PEMFC). However, the amount limitation and price of Pt shound be taken into consideration of its usage. The sulfides exist in feeding fuel may influence the efficiency of PEMFC, especially H2S. Recently, developing the electrocatalyst with high H2S tolerance is considered as an important issue, and one of the effective ways is the application of bimetallic catalysts. Accordingly, the transition metals such as Zn, V, Cr and Ni are used to combine with Pt forming bimetallic catalysts on the anode in PEMFC. Then, the addition of alkali metal (Na) is applied to enhance the H2S torelence in fuel cells. Finally, the Pt-related electrodes are recoveried by H2 after they are poisoned by H2S. The aim of this study is to find an eletrocatalyst with high H2S tolerance, and it can be recoveried by H2 after H2S poisoning. Based on the experimental tests, the Pt catalysts can be uniformly dispersed on the carbon paper by using syringe injection and sonication. On the other hand, increasing the cell temperature causes the decrease of performance of electrocatalyst because of the transportation of oxygen in cathode is affected. Moreover, the result of various bimetallic catalysts at room temperature (35℃) presents the sequence of Pt > Pt-Zn > Pt-V > Pt-Cr > Pt-Ni. However, the experimental results illustrate that H2S (5ppm) can strongly influence and reduce the efficiency of PEMFC. After addition of alkali metal (Na), the Pt/Pt-Na catalyst can be recovered by H2 significantly, but less effect of alkali metal on the Pt/Pt-Zn-Na catalyst.
URI: http://hdl.handle.net/11455/5759
其他識別: U0005-2008201022410400
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2008201022410400
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