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標題: 白金觸媒承載於含鐵磷酸鹽多孔微米球應用於燃料電池
Preparation and characterization of Pt Catalysts Supported on Fe-contained Phosphate Porous Microspheres for Fuel Cells
作者: 張博勝
Chang, Po-Sheng
關鍵字: 直接甲醇燃料電池
iron phosphate
platinum catalysts
porous microspheres
出版社: 材料科學與工程學系所
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摘要: 直接甲醇燃料電池(DMFC)是將甲醇燃料直接轉換成電能的裝置,可應用於攜帶型電子產品上。為普及商品化,仍有許多問題需要被解決,例如二元合金(如PtRu)可被用於改善甲醇氧化過程之中間產物一氧化碳(CO)毒化Pt而降低其活性之現象。本研究主要目的係利用兩種含鐵磷酸鹽類微米球承載白金觸媒,以提高觸媒效能,並改善CO毒化現象。 利用化學合成法製備含鐵磷酸鹽微米球做為其中一種白金載體,由TGA/DSC熱分析及X光繞射分析(XRD)顯示,剛合成出之晶體結構為Fe3(PO4)2‧8H2O,在100°C至500°C加熱脫水後形成非晶形磷酸鹽,在600°C以上則形成FePO4、Fe3PO7及Fe2O3結晶相,以掃描式電子顯微鏡觀察結果顯示微米球大小約為10μm由片狀結構所組成。利用XRD分析Pt負載於此微米球(Pt/V),其白金顆粒大小平均為4.2nm。由循環伏安法(Cyclic Voltammetry)測試氫氣吸/脫附反應,其電化學活性表面積為128-155 m2 g-1;對於甲醇氧化反應,其中Pt/VH0-0.1具有最高的質量活性 (8.98 A/gPt,在0.2 V vs. Ag/AgCl)且無CO毒化現象。 於另一種含鐵磷酸鈣微米球為載體之白金(Pt/FeHAp),由TEM觀察其顆粒大小約為3.41 nm,而XRD之分析其大小約為4.4 nm。利用CV測試氫氣吸/脫附反應(Hydrogen adsorption/desorption),在-0.128V (vs. Ag/AgCl)之氫氣脫附特徵峰位置,發現Pt/FeHAp之白金顆粒以(110)晶面組成為主,且Pt20/FeHAp之電化學表面積(electrochemical surface area)可達200 m2 g-1。在甲醇氧化反應中,雖然Pt33/FeHAp氧化峰值電流密度比值(IForward/IReverse)僅為1.18,卻有最高之質量活性190.4 A/gPt (在0.81 V vs. Ag/AgCl)。
Direct methanol fuel cell (DMFC) is a device converting fuel into electric energy and usually used for portable electronic applications. Pt-Ru catalysts are widely used to solve the problem caused by carbon monoxide (CO) which is the intermediate during methanol oxidation. In this study, two kinds of iron-contained phosphate porous microspheres were prepared as the supports for Pt catalysts to improve the performance in fuel cells and prevent the CO poisoning. As-synthesized iron phosphate microspheres were synthesized by chemical precipitation method and used as one kind of supports. Vivianite, (Fe3(PO4)2‧8H2O), was transformed into dehydrated amorphous iron phosphate from 100 °C to 500 °C, and crystalized into FePO4, Fe3PO7, and Fe2O3 above 600 °C, identified by thermal gravimetric analysis/differential scanning calorimetry (TGA/DSC) and X-ray diffraction (XRD). The iron phosphate porous microsphere was composed of plates and the diameter was about 10μm. The particle size of Pt supported on vivianite (Pt/V) is around 4.2 nm. The cyclic voltammetry indicated that the electrochemical surface area (ECSA) ranges from 128 to 155 m2 g-1. The mass activity of Pt/V was 8.98 A/gPt at 0.2 V vs. Ag/AgCl for methanol oxidation reaction. No forward or reverse current peak was observed, indicating scarce CO poison effect. FeHAp microspheres are used as the other kind of support for Pt. The Pt particle size is around 4.4 nm analyzed by XRD and 3.41 nm observed by TEM. The cyclic voltammograms of Pt/FeHAp catalysts exhibit the characteristics of Pt (110) with desorption peak potential at -0.128 V (vs. Ag/AgCl) similar to Pt/vivianite. The ECSA of Pt20/FeHAp (200 m2 g-1) is greater than those of Pt33/FeHAp and Pt50/FeHAp. However, Pt33/FeHAp shows the greatest mass activity (190.4 A/gPt, at 0.81 V vs. Ag/AgCl) of methanol oxidation, although the IF/IR ratio is just 1.18.
其他識別: U0005-2107201219325400
Appears in Collections:材料科學與工程學系



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