Farklı destek malzemeleri ile hazırlanmış kobalt fitalosiyanin katalizörünün üretimi karakterizasyonu ve pem yakıt pili performansının incelenmesi


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Thesis Type: Postgraduate

Institution Of The Thesis: Kocaeli University, Fen Bilimleri Enstitüsü, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2019

Thesis Language: Turkish

Student: SÜMEYYE DURSUN

Principal Supervisor (For Co-Supervisor Theses): Ramiz Gültekin Akay

Co-Supervisor: Mehmet Suha Yazıcı

Abstract:

The most widely used catalyst in proton exchange membrane fuel cell (PEMFC) is carbon supported platinum catalysts. The high cost of platinum-based catalysts prevents the commercialization of PEM fuel cells. That is why development of high activity and low cost catalysts is an important research topic. The aim of this study is to use cobalt phthalocyanine (CoPc) as oxygen reduction reaction catalyst prepared with different carbon-structured support materials for PEM fuel cells. In this scope, performance comparisons were made in which Vulcan-XC72, carbon nanotube and CVD graphene and their binary mixtures were used as support material. Graphene was produced by chemical vapor deposition method. Carbon supported CoPc catalysts were prepared by impregnation method. Physical and electrochemical characterizations of prepared catalyst were investigated by ICP-OES, TGA, XRD, SEM, TEM and CV techniques. The cathode performances of the catalysts were measured by fuel cell tests. Three different temperatures (800 °C, 650 °C and 500 °C) were studied to examine the effect of heat treatment temperature and the best performance was obtained by 800 °C heat treatment. Increase in fuel cell performance was observed in the following order CoPc/graphene, CoPc/Vulcan-graphene, CoPc/CNT-graphene, CoPc/CNT, CoPc/Vulcan, CoPc/Vulcan-CNT. The best power densities at 60 °C cell temperature, 100% humidity, 5 psi back pressure were found as 32, 171, 179, 189, 296, 303 mW/cm2, respectively. It was observed that CVD graphene has reduced the performance because of mass transport limitations. Hybridization Vulcan with CNT improved performance. The back pressure effect at 0, 5, 15, 25 psi was investigated and fuel cell performance was improved as increase in backpressure. Keywords: Graphene, Carbon Nanotube, Cobalt Phthalocyanine, PEMFC, Vulcan