Controllable Deposition of Platinum Layers on Oxide Surfaces for the Synthesis of Fuel Cell Catalysts. Issue 10 (13th September 2016)

• Record Type: Journal Article
• Authors: Vukmirovic, Miomir B.; Kuttiyiel, Kurian A.; Meng, Hui; Adzic, Radoslav R.
• Is Part Of: ChemElectroChem. Volume 3:Issue 10(2016)
• Page Start: 1635
• Page End: 1640
• Publication Date: 2016-09-13
• Subjects: adsorption -- galvanic displacement -- metal oxides -- monolayers -- platinum; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201600255
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Reducing the amount of Pt, the most costly component of both anode and cathode fuel cell catalysts, has attracted considerable attention from the research community. An approach is reported herein to deposit sub‐monolayer to multilayer amounts of Pt and other noble metals on metal oxides and oxidized carbon materials. The process is exemplified by Pt deposition on RuO2 (110). The Pt deposit consists of Pt atoms arranged in a c (2×2) array, that is, a 0.25 monolayer (ML). The deposit has lower catalytic activity for the oxygen reduction reaction (ORR) and similar activity for the hydrogen oxidation reaction compared to Pt(111). These activities are explained by a large calculated upshift of the d‐band center of Pt atoms and larger Pt–Pt interatomic distances than those of Pt(111). A catalyst with Pt coverage larger than 0.25 ML on oxide surfaces and oxidized carbon materials is shown to be active for the ORR as well as for other electrocatalytic reactions. A PtRhSnO2 /C catalyst shows high activity for ethanol oxidation as a result of its ability to effectively cleave the C−C bond in ethanol. Pt deposited on reduced graphene oxide shows high Pt mass ORR activity and good stability. Abstract : Metal on metal oxides : A versatile method for the controllable deposition of metals, from sub‐monolayer to multilayer deposits, on metal oxides and oxidized carbon materials is described and their catalytic properties are presented. A range of catalysts, from single atom to multi‐metal derivatives, are tested for their activities in oxygen reduction, hydrogen oxidation and ethanol oxidation reactions.