Doğan ÇİRMİ, Özkan GÖRMEZ, Barış SAÇLI, Uğur ÇAĞLAYAN, Muharrem KUNDURACI

AgFeO2 Delafosit Malzemelerin Sentez Koşulları, Kristal Yapısı, Morfolojisi ve OER Aktivitesi Arasındaki İlişki

Bu çalışmada, delafosit yapılı AgFeO2 malzemeleri hidrotermal yöntem kullanılarak sentezlenmiştir. Sentez sıcaklığına (115, 155 veya 180 oC) ve NaOH miktarına (1,0, 1,6, 2,0 veya 2,4 g) bağlı olarak delafosit malzemeler ya çift-fazlı 3R/2H-AgFeO2 ya da tek-fazlı 3R-AgFeO2 kristallerden oluşmuştur. Yüksek sıcaklıklar ve NaOH miktarındaki artış µm boyutlu 3R (uzay grubu R-3m) kristallerin büyümesine yardımcı olurken, düşük sıcaklık ve NaOH miktarındaki azalış nm boyutlu 2H (uzay grubu P63/mmc) kristallerin oluşumunu desteklemiştir. Farklı delafosit malzemelerin kıyaslaması sonucu, oksijen çıkış tepkimesi akımının çift-fazlı malzemelerde daha yüksek olduğu belirlenmiştir. Ayrıca, çift-fazlı sistemden tek-fazlı sisteme geçişte oksijen çıkış tepkimesi akımında ani düşüş görülmüştür. Elde edilen veriler ışığında, 3R ve 2H fazlı delafositlerin elektrokimyasal davranışları arasındaki fark, literatürdeki benzer çalışmalar da dikkate alınarak ayrıntılı olarak tartışılmıştır.

Anahtar Kelimeler:

AgFeO2, Delafosit, Hidrotermal yöntem, Oksijen çıkış reaksiyonu

Interplay Between Synthesis Conditions, Crystal Structure, Morphology and OER Activity of AgFeO2 Delafossite Materials

In this current study, delafossite type AgFeO2 materials were synthesized using the hydrothermal method. Depending on synthesis temperature (115, 155 or 180 oC) and NaOH mineralizer mass (1.0, 1.6, 2.0 or 2.4 g) amount, the delafossites were composed of either mixed-phase 3R/2H-AgFeO2 or single-phase 3R-AgFeO2 crystals. Higher temperatures and NaOH mass were helpful to the growth of µm-sized 3R (space group of R-3m) crystals while lower temperatures and mineralizer mass produced nm-sized 2H (space group of P63/mmc) crystals. The comparison of different delafossite samples revealed that the oxygen evolution reaction (OER) current was larger in mixed-phase materials. Also, the transition from two-phase system to single-phase system was accompanied with a sudden drop in OER current. On the other hand, the difference between the electrochemical behavior of 3R and 2H phase delafossite is discussed in detail by considering similar studies in the literature.

Keywords:

AgFeO2, Delafossite, Hydrothermal method, Oxygen evolution reaction,

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