Ultralow Pt loading on CVD graphene for acid electrolytes and PEM fuel cells. (4th October 2018)

• Record Type: Journal Article
• Authors: Yazici, M. Suha; Azder, M. Akif; Salihoglu, Omer; Boyaci San, F. Gul
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 40(2018)
• Page Start: 18572
• Page End: 18577
• Publication Date: 2018-10-04
• Subjects: CVD graphene -- Sputter Pt -- Oxygen reduction -- PEM fuel cell; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.06.020
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Continuous-phase, porous graphene was produced by CVD process and tested for suitability as catalyst and catalyst support for polymer electrolyte membrane (PEM) fuel cells. N-doping of CVD graphene was carried by NH3 gas flown over graphene for a given time. Ultralow Pt was sputter deposited onto porous, continuous phase N-doped graphene. Oxygen reduction reaction (ORR) activity by Rotating Disc Electrode (RDE) in 0, 1 M HClO4 electrolyte and PEM fuel cell performance were measured. N-doping and thicker Pt sputtering increases reduction current in RDE measurements. Sputter deposition of 1 nm and 10 nm Pt on CVD graphene (2.1 and 21.45 μgPt/cm 2 loading) has shown orders of magnitude increase in current compare to only-graphene samples. In fuel cell testing, sputter deposited Pt layer of 10 nm has provided 2.5 A/mgPt at 0.5 V polarization while 1 nm samples shows 15 A/mgPt performance at the same voltage. Graphical abstract: Highlights: Continuous phase CVD graphene utilized as PEM fuel cell electrode. PEM fuel cell operation with N-dopped graphene without any metal catalyst gives current. Sputter deposition of 1 nm Pt has shown orders of magnitude increase in fuel cell current. 10 nm Pt deposition has provided 2, 5 A/mgPt versus 1 nm gives 15 A/mgPt in fuel cell operation.