製備鐵/鉑核殼奈米觸媒與其在質子交換模燃料電池之陰極材料應用

林有良(You-Liang Lin)

指導教授 ： 陳家俊

國立臺灣師範大學/理學院/化學系/碩士(2006年)

摘要

我們利用逐步還原法合成出Fe-core Pt-shell結構奈米粒子，並利用此奈米粒子測量其對氧氣還原反應的活性。此催化劑的晶型結構及催化特性由XRD、TEM、EDX及電化學測量分析，並將其結果與Pt、FePt、CoPt及Fe1-XPtCoX合金催化劑做比較。由TEM圖得知，這些奈米觸媒其顆粒大小約為4-8奈米之間。為了增加其活性及穩定性，將此催化劑吸附在碳黑上並加熱至5000C。本實驗是利用旋轉電極測試氧氣還原反應的活性催化。我們發現比起Pt、FePt、CoPt及Fe1-XPtCoX合金催化劑，Fe-core Pt-shell結構奈米粒子在氧氣還原反應的催化活性是最好的。由結果顯示出Fe-core Pt-shell結構奈米粒子對於ORR催化活性有更進一步的提升。

關鍵字

鐵鉑 ； 核殼材料 ； 質子交換膜 ； 燃料電池 ； 氧氣還原

並列摘要

The Fe-core Pt-shell electrocatalysts using step by step reducing process were synthesized and characterized for the purpose of the fuel cell cathode oxygen reduction reaction. The synthesized catalysts were characterized in terms of structural morphology and catalytic activity by XRD, TEM, EDX and electrochemical measurements. In addition, we also synthesized the Pt、FePt、CoPt and FeCoPt alloy catalysts. The all nanoparticles size were 4-8nm . In order to improve activity and stability, the catalysts were loaded on the carbon black and heat-treated at 500?C . The catalyzed ORR kinetics were also studied with using the rotating disk electrode (RDE) method. Compared to catalytic properties of the Pt、FePt、CoPt and FeCoPt alloy catalysts, the result of Fe-core Pt-shell electrocatalysts was the highest ORR activity. The results showed that the synthesized Fe-core Pt-shell catalysts have futher promotion in the ORR catalytic activity.

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