Electrocatalytic approach for the efficiency increase of electrolytic hydrogen production: Proof-of-concept using platinum-dysprosium alloys

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

D.M.F. Santos (Autor) Outra; B. Sljukic (Autor) Outra; C.A.C. Sequeira (Autor) Outra; D. Macciò (Autor) Outra; A. Saccone (Autor) Outra; José Luís Figueiredo (Autor) FEUP

Revista

Título: Energy

Vol. 50

Páginas: 486-492

ISSN: 0360-5442

Editora: Elsevier

Indexação

ISI Web of Knowledge - 18 Citações

ISI Web of Science

Scopus - 15 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: P-005-335

DOI: 10.1016/j.energy.2012.11.003

Abstract (EN): Development of electrocatalytic materials for the hydrogen evolution reaction (HER) is attempted with the aim of reducing the water electrolysis overpotential and increasing its efficiency. Using linear scan voltammetry measurements of the hydrogen discharge enables evaluation of the electrocatalytic activity for the HER of platinum-dysprosium (Pt-Dy) intermetallic alloy electrodes of different compositions. Understanding of materials electrocatalytic performance is based on determination of several crucial kinetic parameters, including the Tafel coefficients, b, charge transfer coefficients, alpha, exchange current densities, j(0), and activation energies, E-a. Influence of temperature on HER is investigated by performing studies at temperatures ranging from 25 degrees C to 85 degrees C. The effect of the Dy amount in the efficiency of the HER on the Pt-Dy alloys is analysed. Results demonstrate that Dy can substantially increase the electrocatalytic activity of the Pt alloys, in comparison to the single Pt electrode. Efforts are made to correlate the microstructure of the alloys with their performance towards the HER.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7