Graphene as an electrode support material in direct formic acid fuel cells
Başlık çevirisi mevcut değil.
- Tez No: 401475
- Danışmanlar: DR. CENGİZ ÖZKAN
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2010
- Dil: İngilizce
- Üniversite: Unıversıty Of Calıfornıa Rıversıde
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
Fuel cells are electrochemical devices that convert chemical energy in fuels to electrical energy directly with high efficiency. Polymer electrolyte membrane (PEM) fuel cells are one of the types of fuel cells and thought as alternative power source in portable applications. H2-02 PEM fuel cells and direct methanol fuel cells (DFAFCs) have 94 % ofportab1e fuel cell market. But, they also have serious limitations such as hydrogen storage, high cost of miniaturized hydrogen containers, low gas phase energy density of hydrogen, low electrocatalytic rate of methanol, methanol crossover on Nafion polymer membrane and toxicity of methanol. Because of these limitations of them, formic acid has been gotten a great deal of attentions as alternative fuel in last decades. Direct formic acid fuel cells (DFAFCs) are a subcategory ofPEM fuel cells and use fonnic acid as fuel source. Formic acid oxidation is occurred at the anode electrode and directly affects performance of the DFAFCs. Purposes of using catalyst supports in fuel cell electrodes are getting better catalyst dispersion, improving charge transport rate and making catalyst metals more stable on electrodes. Carbon has these properties and carbon black is widely used for electrode support applications. A recent investigation shows that graphene also attractive candidate for this aim and has better electrocatalytic properties than commercial ones in DF AFCs. In this study, three graphene based samples have different amount of Pt deposition (5, 20, and 50 %) have been prepared as catalyst support for formic acid electrooxidation. Results of Scanning electron microscopy, carbon monoxide stripping and formic acid oxidation experiments have been compared with previous research.
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