Novel electrodeposition media to synthesize CoNi-Pt Core@Shell stable mesoporous nanorods with very high active surface for methanol electro-oxidation. (20th August 2015)

• Record Type: Journal Article
• Authors: Serrà, A.; Gómez, E.; Vallés, E.
• Is Part Of: Electrochimica acta. Volume 174(2015)
• Page Start: 630
• Page End: 639
• Publication Date: 2015-08-20
• Subjects: Core@shell nanorods -- Mesoporous nanorods -- Methanol electro-oxidation -- Electrodeposition -- Water-in-ionic liquid microemulsions; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.06.069
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical Abstract: Highlights: Novel electrochemical strategies to synthesise mesoporous CoNi@Pt nanorods. Electrocatalysts for methanol oxidation in fuel cells. Electrosynthesis in W-in-IL microemulsion leads to greatly porous nanorods. Mesoporous CoNi@Pt nanorods exhibit extraordinary electrocatalytic activity for MOR. Pt shell over mesoporous nanorods enhances platinum activity. Abstract: Three strategies have been tested to obtain stable mesoporous CoNi@Pt nanorods with a very high effective area and good performance for methanol electro-oxidation. They are based on, firstly, an electrochemical synthesis of the CoNi nanorods using three clearly different systems (micellar solution, water-in-ionic liquid microemulsion and suspension of polystyrene nanoparticles), and, secondly, a posterior platinum shell formation by interfacial replacement reaction. The obtained nanorods have been compared with pure platinum ones prepared following the three methods. The synthesized mesoporous platinum nanorods already show very good performance for methanol oxidation in comparison with compact ones or the usual Pt/C catalyzers, but the mesoporous CoNi@Pt nanorods have demonstrated much better performance for methanol oxidation, due to the more active platinum atoms in the shell of platinum than in the bulk, the higher good poison tolerance and the lower cost of the material -owing to the drastic saving in platinum in the nanostructures-. The mesoporous CoNi@Pt nanorods obtained from the water-in-ionic liquid microemulsion are the best candidates as electrocatalysers because they provide a significantly higher mass-normalized current density (1326 mA mg −1 ), a good stability in the sulfuric acidic medium and significant electrocatalytic stability under continuous operating conditions.