Pt-Ru-NiTiO3 Nanoparticles Dispersed on Vulcan as High Performance Electrocatalysts for the Methanol Oxidation Reaction (MOR)

Thiagarajan, Velumani and Karthikeyan, Palaniswamy and Manoharan, Ramasamy and Sampath, Srinivasan and Hernandez-Ramirez, A and Sanchez-Castro, M E and Alonso-Lemus, I L and Rodriguez-Varela, F J (2018) Pt-Ru-NiTiO3 Nanoparticles Dispersed on Vulcan as High Performance Electrocatalysts for the Methanol Oxidation Reaction (MOR). In: ELECTROCATALYSIS, 9 (5). pp. 582-592.

PDF Ele_9-5_582_2018.pdf - Published Version Restricted to Registered users only Download (3MB) | Request a copy

Abstract

We propose a high performance electrocatalyst based on Pt-Ru-NiTiO3 nanoparticles supported on Vulcan carbon (Pt-Ru-NiTiO3/C) for the methanol oxidation reaction (MOR) in acid medium. The electrocatalyst is prepared from a two-step procedure using a wet chemical method. The morphological studies from TEM indicate that Pt-Ru-NiTiO3 nanoparticles are uniformly distributed on Vulcan carbon. The XRD shows the fcc structure of Pt nanomaterials, while the chemical composition examined using XPS indicates the presence of large fractions of Pt-0 and Ru-0 species (i.e., metallic state), OH- and O2- species are also formed on the surface of the catalyst. The Pt-Ru-NiTiO3/C electrocatalyst exhibits a higher catalytic activity compared to a PtRu/C alloy. Pt-NiTiO3/C is also more active than the alloy. Therefore, on one side, the addition of Ru enhances the MOR through the formation of oxygenated adsorbed species on Ru, which thereby promotes the oxidation of CO to CO2 at more negative potentials (i.e., the bifunctional mechanism). On the other hand, the superior electrocatalytic performance of Pt-Ru-NiTiO3/C is attributed also to the synergistic effects of NiTiO3, which promotes the reaction increasing the current density and shifting the onset potential to even more negative values, suggesting that it also participates in the bifunctional mechanism along with Ru. From the results shown here, Pt-Ru-NiTiO3/C can be a promising anode nanomaterial for direct methanol fuel cells (DMFCs).

Item Type:	Journal Article
Publication:	ELECTROCATALYSIS
Publisher:	SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Additional Information:	Copyright of this article belong to SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	08 Aug 2018 15:45
Last Modified:	08 Aug 2018 15:45
URI:	http://eprints.iisc.ac.in/id/eprint/60358

Actions (login required)

View Item