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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65033

    Title: 含鈦半導體陶瓷材料作為載體的燃料電池觸媒研究
    Authors: 林妍妤;Lin,Yen-Yu
    Contributors: 化學學系
    Keywords: 陽極觸媒;甲醇氧化;鉑釕合金;金屬陶瓷材料;Anode catalysts;Methanol Oxidation;PtRu Aolly;Metal Ceramic Materials
    Date: 2014-07-31
    Issue Date: 2014-10-15 14:38:43 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 直接甲醇燃料電池因為具有工作溫度低、進料容易和高能量密度(6.09 kWh kg-1)等優點而引起了各界的關注,但是其亦有諸如較低的功率密度、白金觸媒易遭一氧化碳毒化(CO tolerance)、甲醇滲透(crossover)與觸媒價格相對高等缺點。本研究以改善直接甲醇燃料電池陽極觸媒之電化學效能、CO耐受性和使用壽命為主要目的。
    實驗結果顯示PtRu/TiO2-C(1:1)、PtRu/TiC-C(1:1)和PtRu/TiN-C(1:1)觸媒與單純碳黑載體的觸媒(平均顆粒大於4.0 nm)相比,具有較高的PtRu金屬粒子分散性和較小的金屬顆粒(平均顆粒在3.5到4.0 nm之間)。而PtRu/TiO2-C(1:1) (1278.0 A/g Pt)、PtRu/TiC-C(1:1) (1598.5 A/g Pt)和PtRu/TiN-C(1:1) (1709.2 A/g Pt)觸媒在甲醇氧化的催化活性方面亦較商用的PtRu/E-TEK (667.3 A/g Pt)和單純碳黑載體之PtRu/CB (1128.1 A/g Pt)觸媒高出許多。其中催化活性最高的PtRu/TiN-C(1:1)觸媒其活性高出商用的PtRu/E-TEK大約2倍之多。
    在80°C的DMFC測試中,PtRu/TiO2-C(1:1)、PtRu/TiC-C(1:1)和PtRu/TiN-C(1:1)觸媒顯示出優秀的效能,功率密度可以達到98.1 mW/cm2、73.5 mW/cm2和80.0 mW/cm2,相較於PtRu /E-TEK的58.9 mW/cm2高出許多。其中PtRu/TiO2-C(1:1)因為擁有良好的甲醇親和力而具有較佳的CO耐受性,而使PtRu/TiO2-C(1:1)在MEA的測試中具有比PtRu/TiN-C(1:1)好的輸出功率。;Direct methanol fuel cells (DMFCs) have attracted considerable interest because of a variety of merits such as low operating temperatures, easy fuel-feeding, and the high energy density of methanol (6.09 kWh kg-1). However, it also has some disadvantages, for example, low power density, Pt poison by CO, methanol crossover, and high cost for catalysts. In this study, we focuse on the improvement in electrochemical performance, CO tolerance, and life time of catalysts.
    Due to the research by the literature, the traditional carbon support is susceptible to corrosion under the harsh conditions, and has weakly interaction with catalytic metal, which will result in the degradation of catalyst performance and life time. So we try to use metal ceramic materials like titanium dioxide (TiO2), titanium carbide (TiC), and titanium nitride (TiN), which are plausible support materials due to their electrochemical and thermal oxidation stability and corrosion resistive nature under electrochemical oxidation condition. In this study, we present the studies using titania and carbon hybrids as supports to prepare PtRu/TiO2-C(1:1), PtRu/TiC-C(1:1), and PtRu/TiN-C(1:1) catalysts system.
    PtRu catalysts prepared using PtRu/TiO2-C(1:1), PtRu/TiC-C(1:1), and PtRu/TiN-C(1:1) supports shows the nanoparticles are highly dispersive and exhibit smaller particle sizes (3.4 to 4.0 nm) on the TiO2, TiC, and TiN supports compared to that on Vulcan XC-72 carbon support (>4.0 nm). The Methanol oxidation reaction shows increasing activity from PtRu/E-TEK (667.3 A/g Pt), PtRu/CB (1128.1 A/g Pt), PtRu/TiO2-C(1:1) (1278.0 A/g Pt), PtRu/TiC-C(1:1) (1598.5 A/g Pt), and PtRu/TiN-C(1:1) (1709.2 A/g Pt). The maximum MOR activity in PtRu/TiN-C(1:1) is found to be nearly twice that of conventional PtRu/E-TEK catalysts.
    Strong metal interaction with Titanium is identified by XPS studies which yielding higher binding energy shift of the three Titania supports, explains the production of smaller particle size and the stability of the nano-participles after I-T curve these systems. This electronic effect also partly accounts for the improved MOR activity. On the effects of CO tolerance, the OH groups on TiO2 surface combines with Ru to remove the CO intermediate, and shows improved CO tolerance over that of TiC and TiN supports where the surface is free of any functional groups. This study demonstrated TiO2, TiC, and TiN are outstanding supports which inhibits the aggregation of PtRu, results in significantly increases MOR catalytic activity and stability. The best MOR activity observed at the PtRu/TiN-C(1:1) catalyst.
    The DMFC comprising the PtRu/TiO2-C(1:1), PtRu/TiC-C(1:1), and PtRu/TiN-C(1:1) anode shows an impressive power density of 98.1 mW/cm2, 73.5 mW/cm2, and 80.0 mW/cm2 compared to a peak power density of 58.9 mW/cm2 found in the MEA (Membrane electrode assembly) with a PtRu /E-TEK anode at 80°C. The better CO-tolerance in the anode catalyst of PtRu/TiO2-C(1:1) originated from its better methanol affinity, for example is likely to be responsible for the better fuel cell out-put compared to the anode made from PtRu/TiN-C(1:1).
    Appears in Collections:[化學研究所] 博碩士論文

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