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Kimyasal Buhar Biriktirme (CVD) yöntemiyle üretilen grafen yapıların bor (B), kobalt (Co)-azot (N)- katkı maddeleri ile Proton Elektrolit Membran (PEM) yakıt pillerinde elektrokatalizör veya destek malzemesi olarak kullanılabilirliği incelenmiştir. Bor doplamada amonyum boran (H3N-BH3) doğrudan kullanılırken sodyum borhidrür (NaBH4) dolaylı olarak kullanılmıştır. Üretilen örnekler elektrokimyasal yöntemler yanında Taramalı Elektron Mikroskobu (SEM), Geçirimli Elektron Mikroskobu (TEM), X-ışını Fotoelektron Spektroskopisi (XPS), Raman ve XRD yöntemleri ile de tanımlanmıştır. Grafen örneklerin elektrokimyasal oksijen indirgeme reaksiyon (ORR) ölçümleri döner disk elektrot (RDE) yönetimiyle, geliştirilen elektrotların yakıt pili testleri 5 cm2 aktif alanda yakıt pili test sistemi ile yapılmıştır. Bor içerikli indirgeme yaklaşımı, yakıt pili testlerinde PtCo/B/grafen katalizör ile 3000 mA/cm2 seviyelerinde diğer yaklaşımların 3 katı ve üzeri akım yoğunluğu vermiştir.
The availability of graphene structures produced by the method of chemical steam accumulation (CVD) with bor (B), kobalt (Co)-azote (N)- additives and proton electrolyte membrane (PEM) fuel batteries has been studied as an electrocatalizer or support material. In bor doping, ammonium boran (H3N-BH3) is used directly while sodium borhydrate (NaBH4) is used indirectly. Produced samples are also defined by the electrochemical methods as well as by the Scream Electron Microscope (SEM), Transmitted Electron Microscope (TEM), X-ray Photoelectron Spectroscopy (XPS), Raman and XRD methods. The electrochemical oxygen reduction reaction (ORR) measurements of graphene samples are performed with the control of the rotating disc electrots (RDE), the fuel battery tests of the developed electrots are performed with the fuel battery test system in the active area of 5 cm2. The bor-containing reduction approach has given a PtCo/B/grafen catalyst in fuel battery tests 3 times the flow intensity of other approaches at 3000 mA/cm2 levels.
Graphene, produced by chemical vapor deposition (CVD) and modified with boron (B), cobalt (Co) and nitrogen (N), was investigated as electrocatalyst and support material for proton exchange membrane (PEM) fuel cells. Ammonia borane (H3N-BH3) was used directly as doping agent while sodium borohydride (NaBH4) was used indirectly. Samples were characterized, in addition to electrochemical methods, by scanning electron microscopy (SEM), X-ray photo-electron microscopy (XPS), Raman spectroscopy and XRD. While rotating disc electrodes (RDE) were used to characterize oxygen reduction reaction capacity of graphene electrodes, fuel cell testing was carried out with 5-cm2 active area single cell. Boron based reduction of catalysts, compare to other approaches, have resulted 3 times higher current density reaching 3000 mA/cm2 with PtCo/B/graphene catalyst in fuel cell testing.
Alan : Fen Bilimleri ve Matematik; Mühendislik; Sağlık Bilimleri
Dergi Türü : Ulusal
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