以脈衝式電沉積法製備新型單層氣體擴散電極用之白金觸媒層-應用在質子交換膜燃料電池

Preparation of Pulsed Electrodeposited Platinum Catalyst Layer on Novel Single-Layer Gas Diffusion Electrode for Proton Exchange Membrane Fuel Cell

吳忠慶(Chung-Ching Wu)

指導教授 ： 陳玉惠

中原大學/理學院/奈米科技碩士學位學程/碩士(2011年)

https://doi.org/10.6840/cycu201100389

摘要

本研究係利用操作快速、簡單、成本低及乾淨的電化學沉積法，將白金前驅物直接還原於單層氣體擴散層(SL-GDLs)表面，製備新型單層氣體擴散電極(SL-GDEs)。利用掃描式電子顯微鏡、循環伏安法及X光粉末繞射光譜儀測量，探討在不同沉積參數下製備的白金觸媒，其表面形態、顆粒大小、結晶性及電觸媒活性之相互關係，以尋求製備最佳單電池效能之最佳化沉積條件。SL-GDEs之觸媒活性皆與市售電極(GDE-600)相比較。最終以最佳化條件所沉積之SL-GDEs組成單電池，進行單電池效能測試與評估分析。
本研究結果顯示：於不同沉積波形下，以脈衝式電沉積所製備之白金觸媒有較佳的結晶性、電化學活性面積及甲醇氧化活性。以200 mAcm-2的脈衝電流於Ton/Toff = 0.001/0.005s下沉積1 Ccm-2有最佳化的沉積參數(200PA1-2)，以此沉積條件所製成之SL-GDEs與Nafion® NRE-212熱壓成單電池，於0.04 mgcm-2之白金沉積量下，進行單電池效能測試，其開路電壓為0.91 V，於0.4 V時電流密度為200 mAcm-2，輸出功率可達79 mWcm-2，其白金之比功率高達988 Wg-1，是以塗佈法製備觸媒層之SL-GDEs的136%，且為GDE-600的168%。

關鍵字

白金觸媒 ； 電極 ； 氣體擴散層 ； 電沉積法 ； 燃料電池

並列摘要

A novel Platinum catalyst (PC) deposited single layer gas duffusion electrode (SL-GDEs), which is different from the multi-layer structure of traditional electrode, was successfully prepared by the electrodeposition (ED) method. The morphology, particle size, crystallization and electrocatalytic activity of the PC layer prepared with different deposition parameters were characterized by SEM, XRD and cyclic voltammetry, respectively. The performances of the membrane electrode assemblys (MEAs) fabricated by the SL-GDEs with various amount of PC and Nafion® NRE-212 were measured by a home-made single cell test instrument。
The results showed that the better electrocatalytic activities, crystallization and electrochemical active surface area (EAS) of PC layers were obtained by the pulse electrodeposition method. The pulse current density of 200 mAcm-2, Ton/Toff = 0.001/0.005s and Charge density of 1Ccm-2 was the optimum parameter (200PA1-2). The MEA, M200PA1-2, was fabricated by the electrode of 200PA1-2 deposited SL-GDEs with Pt loading of 0.04 mgcm-2 and Nafion® NRE-212. The single cell test of M200PA1-2 with H2/O2 gases showed that the best currents and power densities at 0.4 V were 200 mAcm-2 and 79 mWcm-2, respectively. The Platinum mass specific power was 988 Wg-1, which was 136% and 168% higher than the values obtained from the PC of catalysts coated SL-GDEs and commercial carbon paper (GDE-600), respectively.

並列關鍵字

Platinum catalyst ； electrode ； gas diffusion layer ； electrodeposition ； Fuel cell

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