Asaf Tolga ÜLGEN, ALİ DÖNER, Mehmet HASKUL

DOĞRUDAN METANOLLÜ YAKIT HÜCRELERİ İÇİN TiO2 DESTEKLİ ANOT GELİŞTİRİLMESİ

Metanollü yakıt hücreleri için yüksek sıralı ve kaliteli TiO2 nano-tüpler (TiO2-NTs) katalizör desteği olarak hazırlanmıştır. Sıralı TiO2-NTs hazırlandıktan sonra yüzeyine küçük miktarlarda nikel (Ni) nanotanecikleri (TiO2-NTs-Ni) elektrokimyasal olarak çöktürülmüştür. Bu şekilde hazırlanan anot katalizörlerinin yüzey ve kristal yapısı sırasıyla taramalı elektron mikroskobu (SEM), dönüşümlü voltametri (CV) ve X-ışını kırınımı (XRD) ile karakterize edilmiştir. Hazırlanan TiO2-NTs-Ni anot katalizörlerinin metanol oksidasyonu için katalitik aktiviteleri 1 M KOH içeren 1 M Metanol çözeltisinde CV ve zamanla kararlılıkları ve dayanıklıkları kronoamperometri (CA) tekniği ile araştırılmıştır. Elde edilen sonuçlara göre TiO2-NTs metanollü ortamda aktivite göstermemiş bununla beraber yüzeyi az miktarda Ni ile kaplanması metanol oksidasyonunu arttırmıştır. Katalizör yüzeyindeki Ni miktarı arttıkça oksidasyon hızı artmaktadır. CV tarama hızı arttıkça oksidasyon pik akımlarında artış gözlemlenmiştir. CA sonuçlarına göre hazırlanan katalizörler bir saat boyunca çalışılan ortamda kararlı ve dayanıklı yapı sergilemiştir. Hazırlanan TiO2-NTs-Ni metanollü yakıt hücreleri için etkin bir anot katalizörü olarak kullanılabilir.

Anahtar Kelimeler:

Yakıt Hücreleri, TiO2-nanotüp, Elektrokimyasal çöktürme, Nikel

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