Synthesis of Reduced Graphene Oxide (rGO) Supported Pt Nanoparticles via Supercritical Carbon Dioxide Deposition Technique for PEM Fuel Cell Electrodes

Abstract

In this work, the preparation of reduced graphene oxide (rGO) supported Pt nanoparticles by using the supercritical carbon dioxide (scCO2) deposition technique is investigated. For this purpose, firstly, graphite oxide synthesis was made similar to the literature reports and then two different reducing agents (DMF and hydrazine hydrate) were used to prepare rGO support materials, called as rGO1 and rGO2, respectively. Finally, Pt nanoparticles (NPs) were formed on the rGO support materials. The effect of the reducing agent type and also of the catalyst preparation technique on the fuel cell performance were examined with spectroscopic, microscopic, and electrochemical techniques. From the results obtained, it appears that the properties of rGO vary significantly depending on the reducing agent used. Moreover, the electrode containing Pt/rGO1 has exhibited better cell performance compared to the Pt/rGO2.

Keywords

• PEM fuel cell electrodes
• Pt nanoparticles
• support material
• reducing agent

PEM Yakıt Pili Elektrotları için Süperkritik Karbondioksit Depozisyon Tekniği ile İndirgenmiş Grafen Oksit (rGO) Destekli Pt Nanoparçacıklarının Sentezi

Öz

Bu çalışmada, süperkritik karbondioksit depozisyon tekniği (scCO2) kullanılarak indirgenmiş grafen oksit destekli (rGO) Pt nanoparçacıklarının sentezi araştırılmaktadır. Bu amaçla, öncelikle, literatüre benzer olarak grafit oksit sentezi gerçekleştirildi ve daha sonra iki farklı indirgeyici ajan (DMF ve hidrazin hidrat) ile sırasıyla rGO1 ve rGO2 olarak isimlendirilen rGO destek malzemeleri hazırlandı. Son olarakta, Pt nanoparçacıkları (NPs) rGO destek malzemeleri üzerine oluşturuldu. Indirgeyici ajan türünün ve katalizör hazırlama tekniğinin yakıt pili performansı üzerindeki etkisi spektroskopik, mikroskopik ve elektrokimyasal tekniklerle incelendi. Elde edilen sonuçlardan, kullanılan indirgeyici ajana bağlı olarak rGO malzemesinin özelliklerinin önemli ölçüde değiştiği görülmektedir. Ayrıca, Pt/rGO1 içeren elektrot, Pt/rGO2’ye kıyasla daha iyi pil performansı sergilemiştir.

Anahtar Kelimeler

• PEM yakıt pili elektrotları
• Pt nanoparçacıkları
• destek malzemesi
• indirgeyici ajan

Kaynakça

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