| 摘要: | 本篇以研究直接甲醇燃料電池 (Direct Methanol Fuel Cell, 簡稱 DMFC) 陽極電催化劑為目的，對 Pt-ZrO2/C 電催化劑進行製備與性質分析，進而開發出能夠改善或增進甲醇燃料電池之效能的電催化劑。
在此分成兩個步驟來製備 Pt-ZrO2/C 電催化劑，第一步，以 ZrO(NO3)2．2H2O 為前驅物，Vulcan XC-72 為碳載體，以共沉澱法先行合成出 ZrO2/C 奈米複合材料；第二步，利用多元醇還原法，以乙二醇作為還原劑，將 Pt 奈米顆粒還原在 ZrO2/C 奈米複合材料上。並嘗試以不同重量比的 Zr 與 C、不同的熱處理溫度以及經過酸或鹼修飾過的碳等參數來製備 Pt-ZrO2/C 電催化劑。本研究使用掃描式電子顯微鏡 (Scanning Electron Microscope, SEM)、穿透式電子顯微鏡 (Transmission Electron Microscope, TEM)、X 光繞射分析儀 (X-ray Diffractometer, XRD) 對電催化劑的表面性質進行分析，再以循環伏安法 (Cyclic Votammetry, CV)、計時安培法 (Chronoamperometry, CA) 進行電化學特性分析。
Pt-ZrO2/C 電催化劑在 300 °C 熱處理溫度下，有著最佳的 MOR 效能表現。而 PZxCy-300 系列電催化劑中，Zr 與 C 重量比為 2 比 78 的這組，Pt 奈米顆粒最小 (2.65 ± 1 nm)，ECSA 為 76 ± 6 m2/g Pt，MOR 效能為 648 ± 35 A/g Pt，也比商業用電催化劑 E-TEK Pt(20 wt%)/C 高。加了酸與鹼修飾過的碳之 PZxCay-300 系列與 PZxCby-300 系列電催化劑，對 MOR 效能雖然沒有明顯的提升，但在整體的表現上是呈現向上的趨勢，且抗 CO 毒化能力與穩定性方面，都有顯著的增強。
This study were prepared the direct methanol fuel cell (Direct Methanol Fuel Cell, referred DMFC) anode catalysts Pt-ZrO2/C. Preparation and characterization of Pt-ZrO2/C eletrocatalysts for the purpose of improving DMFC performance.
Here two-step process to prepare Pt-ZrO2/C electrocatalyst. The first step to synthesized ZrO2/C nanocomposite by co-precipitation method use ZrO(NO3)2．2H2O as precursor, Vulcan XC-72 as carbon support. Second, use the polyol reduction method with ethylene glycol as a reducing agent to reduce the Pt nanoparticles dispersed on ZrO2/C nanocomposite. And try to change different weight ratio of Zr and C, different heat treatment temperatures and carbon support modified by acid or base. In this study, using a scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction analyzer (XRD) to analyze the electrical properties on the surface of the electrocatalyst. The electrochemical characterization was examined by cyclic voltammetry (CV) and chronoamperometry (CA) in acidic solutions.
The Pt-ZrO2/C electrocatalyst has the best MOR performance at 300 ° C. When the PZxCy-300 series of electrocatalyst weight ratio of Zr and C was 2 to 78, it was have the smallest Pt nanoparticles Pt (2.65 ± 1 nm). Meanwhile, both the ECSA (76 ± 6 m2/g Pt) and MOR efficacy (648 ± 35 A / g Pt) were high than commercial electrocatalyst E-TEK Pt(20 wt%)/C. Although the PZxCay-300 and the PZxCby-300 series electrocatalyst used carbon support modified by acid or base didn’t have much more improvements MOR efficacy. But for CO tolerance ability and stability, it were significantly enhance. |
