Communication—Electrochemical Stability of Pt/Pd(111) Model Core-Shell Structure in 80°C Perchloric Acid. Issue 9 (1st January 2017)

• Record Type: Journal Article
• Authors: Todoroki, N.; Bando, Y.; Tani, Y.; Kaneko, S.; Watanabe, H.; Takahashi, S.; Wadayama, T.
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 9(2017)
• Page Start: F908
• Page End: F910
• Publication Date: 2017-01-01
• Subjects: accelerated durability test -- core-shell -- Fuel cell -- Oxygen reduction reaction -- palladium -- platinum; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0571709jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : We investigated the electrochemical stability of a Pt/Pd(111) model core–shell structure for oxygen reduction reaction catalysts in 0.1 M HClO4 at 80°C by performing potential cycles (PCs) between 0.6 and x V vs. RHE ( x = 0.8–1.0; x V-PCs). Pristine Pt/Pd(111) shows an ORR activity four times higher than that of Pt(111), which considerably decreased after 5000 cycles of 0.9- and 1.0 V-PCs and remained nearly unchanged for the 0.8- and 0.85 V-PCs samples. These results suggest that the atomic-scale structural changes at the Pt/Pd interface that depend on PC windows determine the durability of Pd–Pt core–shell structures.