DOĞRUDAN METANOLLÜ YAKIT HÜCRELERİ İÇİN TiO2 DESTEKLİ ANOT GELİŞTİRİLMESİ

Yıl 2019, Cilt: 24 Sayı: 1, 277 - 288, 30.04.2019

Asaf Tolga Ülgen , Ali Döner , Mehmet Haskul

https://doi.org/10.17482/uumfd.473432

Öz

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

Kaynakça

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