Fuel Cell Performance of Palladium-Platinum Core-Shell Electrocatalysts Synthesized in Gram-Scale Batches

This paper presents the performance of palladium-platinum core-shell catalysts (Pt/Pd/C) for oxygen reduction synthesized in gram-scale batches in both liquid cells and polymer-electrolyte membrane fuel cells. Core-shell catalyst synthesis and characterization, ink fabrication, and cell assembly det...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2016-01, Vol.163 (7), p.F708-F713
Main Authors: Khateeb, Siddique, Guerreo, Sandra, Su, Dong, Darling, Robert M., Protsailo, Lesia V., Shao, Minhua
Format: Article
Language:English
Subjects:
Center for Functional Nanomaterials
Core-shell
ENERGY PLANNING, POLICY, AND ECONOMY
oxygen reduction reaction
platinum monolayer
polymer electrolyte membrane fuel cell
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Summary:This paper presents the performance of palladium-platinum core-shell catalysts (Pt/Pd/C) for oxygen reduction synthesized in gram-scale batches in both liquid cells and polymer-electrolyte membrane fuel cells. Core-shell catalyst synthesis and characterization, ink fabrication, and cell assembly details are discussed. The Pt mass activity of the Pt/Pd core-shell catalyst was 0.95 A mg−1 at 0.9 V measured in liquid cells (0.1 M HClO4), which was 4.8 times higher than a commercial Pt/C catalyst. The performances of Pt/Pd/C and Pt/C in large single cells (315 cm2) were assessed under various operating conditions. The core-shell catalyst showed consistently higher performance than commercial Pt/C in fuel cell testing. A 20-60 mV improvement across the whole current density range was observed on air. Sensitivities to temperature, humidity, and gas composition were also investigated and the core-shell catalyst showed a consistent benefit over Pt under all conditions. However, the 4.8 times activity enhancement predicated by liquid cell measurements was not fully realized in fuel cells.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.1301607jes