Production of boron-dopped CVD graphene and fuel cell performance

Öz

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.

Anahtar Kelimeler

• Boron-dopping,CVD graphene,Fuel cell

Bor doplu CVD grafen üretimi ve yakıt pili performansı

Öz

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.

Anahtar Kelimeler

• Bor doplama,CVD grafen,Yakıt pili

Kaynakça

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