The role of Pt loading on reduced graphene oxide support in the polyol synthesis of catalysts for oxygen reduction reaction. (14th August 2020)

• Record Type: Journal Article
• Authors: Lagarteira, Tiago; Delgado, Sofia; Fernandes, Celina; Azenha, Cátia; Mateos-Pedrero, Cecilia; Mendes, Adélio
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 40(2020)
• Page Start: 20594
• Page End: 20604
• Publication Date: 2020-08-14
• Subjects: Proton exchange membrane fuel cell -- Oxygen reduction reaction -- Catalyst durability -- Reduced graphene oxide support; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.02.022
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Common carbon-blacks have shown insufficient stability as cathodic catalyst supports for proton exchange membrane fuel cells (PEMFCs). In this regard, alternative supports have been proposed and, specifically graphene or reduced graphene oxide (rGO), have attracted special attention. Herein, a set of electrocatalysts using reduced graphene oxide (rGO) as support is synthetized by a modified polyol method. The influence of Pt loading on the support is studied and compared with conventional supports, considering Pt particle morphologies and oxygen reduction reaction (ORR) performance in rotating disk electrode (RDE). Despite Pt average particle size typically increases with the Pt loading, 30 wt% of Pt on rGO is the optimal Pt loading, yielding the highest ORR activity among the rGO-supported electrocatalysts. These results show that both Pt loading and type of support greatly impact on the morphology and electrochemical performance of Pt nanoparticles. Graphical abstract: Image 1 Highlights: 30 wt.% of Pt/rGO presented the best Pt particle dispersion on the support. rGO-supported catalysts displayed impressive area-specific ORR activities. Increasing Pt loading on rGO led to higher Pt average particle size.