臺灣博碩士論文加值系統

本論文研究碳紙支撐鈀觸媒的結構特性和的ORR活性，一方面電鍍鈀和鈀鈷觸媒於碳紙或氧化錫奈米線支撐上，另一方面電鍍具有優選晶面的鈀奈米晶體於碳紙上，進行循環伏安(CV)和使用旋轉電極軸(RDE)作線性掃描伏安(LSV)的電化學測試，經由電化學測試的結果，Pd-Co/SnO2 NW/CP和具有優選Pd(110)的鈀觸媒有優秀的表現。
鈀鈷電化學觸媒中，脈衝電流密度100mAcm-2，鍍0.1秒停0.9秒及Pd:Co莫耳比例66: 34的觸媒Pd-Co/SnO2 NW/CP，擁有46.8 m2g-1 Pd的電化學比表面積，在0.85V vs. RHE的ORR電流為0.17mAcm-2，另一方面在添加NaCl於溶液，以-0.3V vs. Ag/AgCl電鍍具有優選晶面的鈀奈米晶體於碳紙上，擁有2.43 m2g-1 Pd的電化學比表面積為和在0.85V vs. RHE的ORR電流為0.89mAcm-2，所以具有優選晶面的鈀奈米晶體顯然為更有潛力的ORR觸媒。

This thesis aims to investigate the structure features and the activities on oxygen reduction reaction (ORR) of Pd catalysts supported by the carbon paper, which is generally utilized in fuel cell gas diffusion purpose. One approach is to electrodeposit Pd and Pd-Co catalysts on the carbon paper or the carbon paper loaded with SnO2 nanowires. The other approach is to electrodeposit the preferential oriented Pd nanocrystals on carbon paper. The electrochemical performance of these catalysts is measured using cyclic voltammetry (CV), linear scanning voltammetry with rotation disk electrode (RDE). Among the catalysts prepared, the Pd-Co/SnO2NW/CP and the preferential (110) Pd catalysts stand out in the ORR activity.
For the Pd-Co electrocatalysts, the sample of Pd-Co/SnO2NW/CP with a molar ratio of Pd:Co=66:34, prepared by 100 mA cm-2 pulse current with duration time 0.1 s and pause time 0.9 s, exhibits an electrochemical surface area of 46.8 m2 g-1, and 0.17 mA cm-2 oxygen reduction current at 0.85 V (vs RHE). For the sample of preferential oriented Pd nanocrystals on carbon paper, deposited at -0.3 V in a sodium chloride buffered solution, shows an electrochemical surface area of 2.43 m2 g-1, and 0.89 mA cm-2 oxygen reduction current at 0.85 V (vs RHE). The preferential oriented Pd nanocrystals appear to be more promising on the ORR activity.

中文摘要 I
英文摘要 II
目錄 IV
圖目錄 VI
表目錄 XI

第一章 緒論 1
第二章 理論基礎與文獻回顧 3
2.1 PEMFC陰極觸媒材料 3
2.2 鈀系列氧還原陰極觸媒 5
2.2.1 鈀合金氧還原陰極觸媒 5
2.2.2 具優選晶面的鈀氧還原陰極觸媒 10
第三章 實驗方法與分析儀器 15
3.1 實驗藥品 15
3.2 儀器設備 18
3.3 成長氧化錫奈米線氣相沉積系統 19
3.4 實驗方法 20
3.4.1 鈀鈷合金陰極觸媒電極製備流程 20
3.4.2 碳紙支撐(110)優選晶面Pd觸媒製備 24
3.5 材料性質分析 25
3.5.1 電化學分析 25
3.5.2 X光能量散佈儀元素組成分析 28
第四章 實驗結果與討論 29
4.1 鈀鈷合金陰極觸媒 29
4.1.1 場發射式掃描式電子顯微鏡分析(FEG-SEM) 29
4.1.2 X光能量散佈儀元素組成分析(EDX) 34
4.1.3 鈀鈷合金陰極觸媒電化學分析 35
4.2 碳紙支撐(110)優選晶面Pd觸媒 47
4.2.1 場發射式掃描式電子顯微鏡分析(FEG-SEM) 47
4.2.2 X光繞射晶相分析(XRD) 50
4.2.3 場發射式穿透式電子顯微鏡分析(FEG-TEM) 52
4.2.4 碳紙支撐(110)優選晶面Pd觸媒電化學分析 57
4.2.5 觸媒甲醇容忍性測試(Methanol Tolerance) 61
第5章 第五章 結論 64
參考文獻 66
附錄 72

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