Polyol synthesis of reduced graphene oxide supported platinum electrocatalysts for fuel cells: Effect of Pt precursor, support oxidation level and pH

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018-08-30

Autores

Lee Pak Hoe (Autor) Outra; Marta Boaventura (Autor) FEUP; Tiago Lagarteira (Autor) FEUP; Loh Kee Shyuan (Autor) Outra; Adélio Mendes (Autor) FEUP

Revista

Título: International Journal of Hydrogen Energy

Vol. 43 Nº 35

Páginas: 16998-17011

ISSN: 0360-3199

Editora: Elsevier

Indexação

ISI Web of Knowledge - 3 Citações

ISI Web of Science

Scopus - 20 Citações

INSPEC

Projetos Associados

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

LEPABE-2-ECO-INNOVATION - LEPABE-2-ECO-INNOVATION

PEMFC-SUDOE - Sustentabilidade energética na região SUDOE: Rede SUDOE-PEMFC

Outras Informações

ID Authenticus: P-00P-MRC

DOI: 10.1016/j.ijhydene.2018.05.147

Abstract (EN): In this work, a comprehensive study on the polyol synthesis of platinum supported on reduced graphene oxide (Pt/rGO) catalysts, including both ex-situ and in-situ characterizations of the prepared Pt/rGO catalysts, was performed. The polyol synthesis was studied considering the influence of the platinum precursor, oxidation level of graphite oxide and pH of reaction medium. The as-prepared catalysts were analyzed using thermogravimetric (TG) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and cyclic voltammetry (CV). The best results in terms of platinum particle size and distribution were obtained when the synthesis was performed in acidic medium, using chloroplatinic acid as precursor and using graphene oxide with high oxidation level. The most promising graphene-supported catalyst was used to prepare a polymer electrolyte membrane fuel cell electrode. The membrane electrode assembly (MEA) prepared with graphene-based electrode was compared with a MEA prepared with catalyst based on commercial platinum supported in carbon black (Pt/C). Single cell characterization included polarization curves and in-situ electrochemical impedance spectroscopy (EIS). The graphene-based electrode presented promising albeit unstable electrochemical performance due to water management issues. Additionally, EIS measurements revealed that the MEA made with Pt/rGO catalyst presented a lower mass transport resistance than the commercial Pt/C.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14