Title Electrochemical promotion of Pt nanoparticles dispersed on a diamond-like carbon matrix: A novel electrocatalytic system for H-2 production
Authors de Lucas-Consuegra, A. , Gonzalez-Cobos, J. , Carcelen, V. , Magen, C. , ENDRINO ARMENTEROS, JOSÉ LUIS, Valverde, J. L.
External publication Si
Means J. Catal.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 6.07300
SJR Impact 2.55300
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880908167&doi=10.1016%2fj.jcat.2013.06.012&partnerID=40&md5=e4bad078d553941b3c304ae45c643bb3
Publication date 01/11/2013
ISI 000327903900002
Scopus Id 2-s2.0-84880908167
DOI 10.1016/j.jcat.2013.06.012
Abstract This study reports for the first time in the literature that the electrochemical promotion (EPOC) of Pt nanoparticles (of around 3 nm) dispersed on a diamond-like carbon (DLC) matrix. A novel Pt-DLC catalyst film has been prepared by the technique of cathodic arc deposition onto a K-beta Al2O3 solid electrolyte support. The catalyst film has been characterized and tested under EPOC conditions in H-2 production from methanol via partial oxidation (POM) and steam reforming (SRM). After a temperature-programmed pretreatment, the Pt-DLC film achieved a suitable electrical conductivity due to the transition of the sp(3)-hybridized carbon form into a more graphitic structure (sp(2)-hybridized) as supported by different characterization measurements such as STEM and EELS. Under EPOC conditions, the H-2 production rates were increased 2.5 and 3.4 times under optimal promoter coverage for POM and SRM, respectively. In addition, under POM conditions, two different electropromotional states were achieved at two different potentials attributed to the formation of different kinds of promoter phases, as confirmed by cyclic voltammetry. Finally, a comparison of the Pt-DLC catalyst film vs. a pure dense Pt layer prepared by the same technique demonstrated the higher activity of the former, due to the lower size of the Pt nanoparticles supported on the DLC matrix. (C) 2013 Elsevier Inc. All rights reserved.
Keywords Electrochemical promotion; NEMCA effect; H-2 production; Partial oxidation; Steam reforming; Diamond-like carbon; Pt-DLC; Cathodic arc deposition; Pt nanoparticles
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