Co3O4/Ni Köpük Nanokompozitlerinin Doğrudan Metanol Yakıt Hücresinde Elektrot Malzemesi Olarak Kullanımı

Year 2021, , 1354 - 1361, 01.06.2021

Bingül Kurt Urhan

https://doi.org/10.21597/jist.878119

Abstract

Bu çalışmada, nikel köpük üzerindeki Co3O4 nano-iğne dizileri (Co3O4/Ni köpük), basit tek-kap hidrotermal yöntemle sentezlenmiş ve ardından tek aşamalı ısıl işlem uygulanmıştır. Co3O4/Ni köpük nanokompozitlerinin yapısal ve morfolojojik analizleri; X-ışını kırınım spektroskopisi (XRD) ve alan emisyonlu taramalı elektron mikroskobu (FESEM) ile karakterize edilmiştir. Alkali çözeltide Co3O4/Ni köpük üzerinde metanolün elektrokimyasal oksidasyonu, dönüşümlü voltametri (CV) ve kronoamperometri (CA) teknikleri ile incelenmiştir. Düşük başlangıç potansiyeli (270 mV), yüksek akım yoğunluğu (67 mA cm-2) ve uzun elektro-oksidasyon kararlılığı (%86) ile Co3O4/Ni köpük mükemmel elektrokatalitik performans göstermiştir. Böylece, sentezlenen nanokompozitin doğrudan metanol yakıt hücreleri için yüksek performanslı platinsiz elektrokatalizörlere mükemmel bir aday olabileceği saptanmıştır.

Keywords

Co3O4, hidrotermal sentez, metanol elektro-oksidasyonu

Thanks

Bu çalışmanın yapılmasında laboratuvar alt yapısının kullanılmasına izin veren Atatürk Üniversitesi Fen Fakültesi Dekanlığı’na ve sentezlenen elektrotların karakterizasyonlarının gerçekleştirildiği Atatürk Üniversitesi Doğu Anadolu Yüksek Teknoloji Araştırma Merkezi’ne (DAYTAM) teşekkür ederim.

Use of Co3O4/Ni Foam Nanocomposites as Electrode Material in Direct Methanol Fuel Cell

Abstract

In this work, Co3O4 nanoneedle arrays on nickel foam (Co3O4/Ni foam) were directly synthesized by facile one step thermal treatment. The structural and morphological analysis of Co3O4/Ni foam nanocomposites were characterized by X-ray diffraction spectroscopy (XRD) and field emission scanning electron microscopy (FESEM). The electrochemical oxidation of methanol on Co3O4/Ni foam in alkaline solution was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) techniques. The Co3O4/Ni foam showed excellent electrocatalytic performance with low onset potential (270 mV), high current density (67 mA cm-2) and long electro-oxidation stability (86%). Thus, it has been determined that the synthesized nanocomposite can be an excellent candidate for high performance platinum-free electrocatalysts directly for methanol fuel cells.

Keywords

Co3O4, hydrothermal synthesis, methanol electro-oxidation

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