Sequential Reduction Synthesis and Development of Carbon Supported Pt-Ru Direct Methanol Fuel Cell Anode Catalysts

Yıl 2017, Cilt: 22 Sayı: 1, 21 - 32, 29.06.2017

Hilal Demir Kıvrak , Berdan Ulaş

Öz

Nowadays, direct fueled fuel cells are among the most studied subjects due to their advantages such as easy portability, refueling and high energy conversion. Pt is a good catalyst for the synthesis of small organic molecules, but Pt is poisoned by the CO gas generated at the low temperatures that the fuel cells operate. It has been reported in the studies about direct methanol feed fuel cell that Pt-Ru catalyst is a good methanol fuel cell catalyst, but when Ru is added, why and how the catalytic activity is increased is still unanswered. In order to answer these questions, preparation of new generation active catalysts is crucial for overcoming existing problems such as poisoning. This work was done to investigate the activities of methanol fuel cell anode catalysts. The catalyts were prepared via sequential reduction method and the effect of catalyst preparation method on methanol electrooxidation activity was investigated. In the measurements performed on carbon supported Rushell-Ptcore (Pt@Ru/C) and Ptshell-Rucore (Ru@Pt/C) catalysts, the results show Ru@Pt/C catalyst having higher activity.

Anahtar Kelimeler

methanol, fuel cell, catalyst, sequential reduction, platinum

Doğrudan Metanol Yakıt Pili Anot Katalizörlerinin Sentezi ve Geliştirilmesi

Öz

Günümüzde doğrudan beslemeli yakıt pilleri kolay
taşınabilirlik, yakıt ikmali ve yüksek enerji dönüşümü gibi avantajları
yüzünden en çok çalışılan konular arasında yer almaktadır. Pt küçük organik
moleküllerin sentezinde iyi bir katalizördür fakat Pt yakıt pillerinin
çalıştığı düşük sıcaklıklarda oluşan CO gazı ile bu koşullarda zehirlenir.
Doğrudan beslemeli metanol yakıt pilleriyle yapılan çalışmalarda Pt-Ru
katalizörünün iyi bir metanol yakıt pili katalizörü olduğu rapor edilmiştir
fakat Ru eklendiğinde katalizörün aktivesinin neden ve nasıl arttığı halen
cevaplanamamıştır. Bu soruların yanıtlanabilmesi için yeni nesil aktif
katalizörlerin hazırlanması, zehirlenme gibi mevcut problemlerin aşılmasında
büyük önem taşımaktadır. Bu çalışma, metanol
yakıt pili anot katalizörlerinin aktivitelerinin araştırılması için
yapılmıştır. Katalizörler sıralı indirgenme yöntemi hazırlanmış ve katalizör
hazırlama yönteminin metanol elektrooksitlenme aktivitesine etkisi
araştırılmıştır. Sonuçlar, Pt@Ru/C ve Ru@Pt/C katalizörler üzerinde yapılan
ölçümlerde Pt@Ru/C katalizörlerin daha yüksek aktivite gösterdiği
gözlemlenmiştir. 

Anahtar Kelimeler

metanol, yakıt pili, katalizör, sıralı indirgeme, platin

Kaynakça

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