Directly Grown Carbon Nanotubes Applied in Direct Methanol Fuel Cell

本論文使用直接成長奈米碳管於碳布上做為觸媒載體，用於直接甲醇燃料電池電極。吾人使用鐵鍍在碳布表面做為成長奈米碳管的催化劑，並且使用微波輔助化學氣相沉積法在碳布上直接成長奈米碳管。直接成長奈米碳管直徑約10到20 nm。由穿透式顯微鏡證明奈米碳管是竹節狀結構。接著，吾人使用物理氣相沉積法將鉑和釕濺鍍在直接成長奈米碳管上，作為直接甲醇燃料電池的陽極。使用X光繞射法，證明鉑和釕形成高度的合金，而且顆粒大小約3.54 nm。採用0.20 mg cm^(-2)鉑和釕的金屬量在直接成長奈米碳管上作為陽極，4.0 mg cm^(-2)鉑在碳布上作為陰極，與Nafion 117作為膜，製作膜電極組(MEA, membrane-electrode assembly)。極化測試在1 M的甲醇和純氧的環境底下進行。所得到的極化曲線顯示，電池在60℃時，最大功率接近1.52W Pt-mg^(-1)，證明此方法使用少量的觸媒金屬在直接成長奈米碳管上，可以得到相當好的效率。

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並列摘要

Carbon nanotubes (CNTs) were directly grown on a carbon cloth (DGCNTs), which were employed as the electrocatalyst support in the direct methanol fuel cell (DMFC). The CNTs were prepared by an iron-assisted catalyst grown method using the microwave plasma-enhanced chemical vapor deposition. From the morphological analysis, the as-prepared DGCNT is a multi-walled and bamboo-like structure with a diameter of 10-20 nm. The Pt-Ru electrocatalysts were deposited on the DGCNTs using sputtering process (Pt-Ru/DGCNT), which were acted as an anode in the DMFC. The diameters of Pt-Ru nanoparticles deposited on the DGCNTs are ca. 3.54 nm, which are the high-degree alloy by X-ray diffraction analysis. For fabricating a membrane electrode assembly (MEA), 0.2 mg/cm^2 Pt-Ru/DGCNT and 4.0 mg/cm^2 Pt black deposited on carbon cloth were employed as the anode and cathode, respectively, which the Nafion 117 was sandwiched in between the electrodes by a hot-pressing process. The polarization curve shows that the maximum power density is ca. 1.52 W/Pt-mg feeding 1 M methanol and pure oxygen to the anode and cathode, respectively, operating at 60℃. The low amount of precious metal loaded on DGCNTs applied in a MEA shows a high performance, which is suitable for a DMFC.

並列關鍵字

carbon nanotube ； direct methanol fuel cell ； direct growth ； methanol oxidation

國際替代計量

Directly Grown Carbon Nanotubes Applied in Direct Methanol Fuel Cell

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