Herein, we report Pt-Ni alloy electrocatalysts prepared by using an arc-plasma deposition (APD) method and their electrocatalytic activity for the ORR. The APD is a physical vapor deposition and gives highly dispersible metal nanoparticles under high vacuum [5, 6].In this work, Pt and Ni nanoparticles were co-deposited on a glassy carbon (GC) substrate by using the APD method. Linear sweep voltammograms of Pt-Ni electrocatalysts prepared by the APD showed reduction currents in 0.1 M HClO4under oxygen, indicating that Pt-Ni electrodes are electrochemically active for the ORR (Fig. 1). Pt-Ni electrodes showed higher ORR activity than Pt electrodes prepared by the APD of Pt nanoparticles on GC, suggesting that the synchronized APD of Pt and Ni nanoparticles resulted in the formation of Pt-Ni alloy nanoparticles. The ORR activity of Pt-Ni electrodes that we prepared depended on APD conditions of substrate temperatures and the APD order of Pt and Ni nanoparticles. The ORR activity increased with increasing the substrate temperature (Fig. 1). The APD of Ni nanoparticles followed by the APD of Pt nanoparticles on the GC gave the Pt-Ni electrocatalyst, which showed higher ORR activity than that prepared by the synchronized APD of Pt and Ni nanoparticles.
This work was supported by NEDO.
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