Synthesis of Reduced Graphene Oxide Coated and Molybdenum Deposited Nickel Foam Electrode in Order to be Used at the Anode of the Microbial Fuel Cell

Yıl 2025, ERKEN GÖRÜNÜM, 1 - 1

Habib Akyazı , Çiğdem Güldür , Silver Güneş

https://doi.org/10.2339/politeknik.1562930

Öz

Microbial fuel cells (MFCs) are chemical reactors that can convert the chemical energy stored in the bonds of organic compounds into electrical energy through catalytic reactions of microorganisms in an anaerobic environment. It is important to develop these systems to reduce the current costs of wastewater treatment systems and to evaluate urban wastewater, having a great energy potential in terms of biodegradable organic substances, while reducing its polluting effects on the environment. The structure of the material used as anode electrode in MFC cells directly affects the adhesion of microorganisms to the anode, oxidation of the substrate and electron transfer. In order to be used in MFC, nickel foam (NF) with a three-dimensional and macroporous structure was coated with reduced graphene oxide (rGO) to ensure a good electrical connection by attachment of microorganisms to the surface and the most suitable molybdenum (Mo) loading method was determined to increase the adhesion of electron-producing bacterial species to the surface. Also, the effects of heat treatment with H2 gas before loading and using ethylene glycol (EG) as reducing agent in the hydrothermal deposition were investigated in Mo loadings. As a result of the study, it was observed that adding EG to the starting solution increased Mo loading, while passing H2 gas disrupted the surface morphology. When the SEM images and EDS analyzes were examined after the study, it was observed that the most homogeneous surface morphology and the highest efficiency were in the NK/rGO/Mo-E sample, which contained 84.39% Mo by mass.

Anahtar Kelimeler

Microbial fuel cell, Anode electrode, Reduced graphene oxide, Molybdenum

Proje Numarası

FCD-2023-8721

Mikrobiyal Yakıt Hücresi Anotunda Kullanılmak Üzere İndirgenmiş Grafen Oksit Kaplı ve Molibden Yüklü Nikel Köpük Elektrot Sentezi

Öz

Mikrobiyal yakıt hücreleri (MYH), organik bileşiklerin bağları arasında bulunan kimyasal enerjiyi, aneorobik ortamda mikroorganizmaların katalitik reaksiyonları ile elektrik enerjisine dönüştürebilen kimyasal reaktörlerdir. Atık su arıtım sistemlerinin mevcut maliyetlerini azaltmak ve biyolojik parçalanabilir organik maddeler yönünden büyük bir enerji potansiyeli bulunan kentsel atıksuların hem değerlendirilmesi hem de çevreye olan kirletici etkilerinin azaltılması için bu sistemlerin geliştirilmesi önem arz etmektedir. MYH hücrelerinde anot elektrotu olarak kullanılan malzemenin yapısı, mikroorganizmaların anoda tutunmasını, substratın oksidasyonunu ve elektron transferini doğrudan etkilemektedir. Bu çalışmada MYH’de kullanılmak üzere üç boyutlu, makrogözenekli yapıda bulunan nikel köpük (NK), mikroorganizmaların yüzeyde tutunarak iyi bir elektriksel bağlantı sağlaması için indirgenmiş grafen oksit (rGO) ile kaplanmış ve elektron üretebilen bakteri türlerinin yüzeyde tutunmasını artırmak için en uygun molibden (Mo) yükleme yöntemi belirlenmeye çalışılmıştır. Ayrıca Mo yüklemelerinde, yükleme öncesi H2 gazı ile ısıl işlemin ve hidrotermal yöntemde indirgen olarak etilen glikol (EG) kullanımının etkileri araştırılmıştır. Çalışma sonucunda başlangıç çözeltisine EG eklemenin Mo yüklemesini artırdığı, H2 gazı geçirilmesinin ise yüzey morfolojisini bozduğu gözlemlenmiştir. Yapılan çalışma sonrası SEM görüntüleri ve EDS analizleri incelendiğinde en homojen yüzey morfolojisinin ve en yüksek verimin kütlece %84,39 oranında Mo içeren NK/rGO/Mo-E numunesinde olduğu gözlenmiştir.

Anahtar Kelimeler

Mikrobiyal yakıt hücresi, Anot elektrot, İndirgenmiş grafen oksit, Molibden

Etik Beyan

Bu makalenin yazarları çalışmalarında kullandıkları materyal ve yöntemlerin etik kurul izni ve/veya yasal-özel bir izin gerektirmediğini beyan ederler.

Destekleyen Kurum

Gazi Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi

Proje Numarası

FCD-2023-8721

Teşekkür

Bu çalışma Gazi Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi tarafından FCD-2023-8721 kodlu proje ile desteklenmiştir.

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