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Preparation and evaluation of a highly stable palladium yttrium platinum core-shell-shell structure catalyst for oxygen reduction reactions

Lookup NU author(s): Dr Terrence Liu, Professor Eileen Yu, Emeritus Professor Keith Scott

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Abstract

A core-shell-shell structure Pd-Y-Pt/C catalyst was prepared using a controlled surface reaction method. The structure was confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray (EDX) techniques. Nano-scale yttrium was formed as a shell located as the middle layer of the catalyst. Electrochemical evaluation of the Pd-Y-Pt/C with less than 7% of Pt showed an improved performance toward oxygen reduction reaction (ORR) compared to Pt/C (20 wt.% Pt). Accelerated degradation tests (ADT) indicated that the addition of Y improved catalyst stability compared to Pt/C and Pd-Pt/C core-shell catalysts under various experimental conditions. This was due to the Y middle layer created approximate half-filled metal-metal d bond between Pt (or Pd) and Y. This catalyst utilized the core-shell-shell structure to minimize the Pt usage, and Y middle shell to improve stability. (C) 2014 The Authors. Published by Elsevier B.V.

Publication metadata

Author(s): Liu XT, Yu EH, Scott K

Publication type: Article

Publication status: Published

Journal: Applied Catalysis B: Environmental

Year: 2015

Volume: 162

Pages: 593-601

Print publication date: 01/01/2015

Online publication date: 29/07/2014

Acceptance date: 19/07/2014

Date deposited: 21/09/2015

ISSN (print): 0926-3373

ISSN (electronic): 1873-3883

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.apcatb.2014.07.038

DOI: 10.1016/j.apcatb.2014.07.038

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