3 years ago

Carbon-supported Pt-Co Nanowires as a Novel Cathode Catalyst for Proton Exchange Membrane Fuel Cells

Z. Yan, B. Li, D. Yang, C. Zhang, H. Lv, J. Wang
Carbon-supported Pt-Co nanowires (Pt-Co NWs/C) were prepared through a soft surfactant template method as cathode catalysts for proton exchange membrane fuel cells (PEMFCs). The mass activity of the Pt-Co NWs/C (0.125 A mgPt−1) is 1.5 times higher than that of commercial Pt/C for oxygen reduction reaction (ORR). The accelerated durability test (ADT) showed a loss of 14.7% in electrochemically active surface areas (ECSA) for the Pt-Co NWs/C, and 35% for the Pt/C after 3,000 cycles between 0.6 and 1.15 V, indicating that stability was enhanced for the Pt-Co NWs/C relative to the Pt/C catalyst. The membrane electrode assembly (MEA) employed as-synthesized Pt-Co NWs/C as cathode catalyst with a loading of 0.4 mgPtCo cm−2 generated a maximum power density of 2.01 kW gPt−1, which is higher than that of the Pt/C (1.85 kW gPt−1). Besides, after 100 h galvanostatic operation condition of 1,000 mA cm−2, the Pt-Co NWs/C also exhibited enhanced durability with 71.4 mW cm−2 mass power density loss and 11.8% ECSA loss, as compared with 99.4 mW cm−2 and 24.8% for the Pt/C, respectively. These results suggest that the formation of the interconnected nanowire networks structure of Pt-Co NWs/C catalyst is favorable to improve activity and durability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/fuce.201700136

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