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

Liu, Xiaoteng, Yu, Eileen H. and Scott, Keith (2015) Preparation and evaluation of a highly stable palladium yttrium platinum core-shell-shell structure catalyst for oxygen reduction reactions. Applied Catalysis B: Environmental, 162, 593-601. (doi:10.1016/j.apcatb.2014.07.038).

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.

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Contributors

Author: Eileen H. Yu

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