Surface structures and electrochemical stabilities for Pt/Pd(111) model electrocatalysts

N. Todoroki, Y. Bando, Y. Tani, S. Kaneko, H. Watanabe, T. Wadayama

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We investigated surface structures and electrochemical stabilities for Pt/Pd(111) bimetallic surfaces fabricated using molecular beam epitaxy. The Pt/Pd(111) surfaces were prepared by depositing four monolayer (ML)-thick Pt onto Pd(111) at substrate temperatures of 300 °C. The oxygen reduction reaction (ORR) activity of the pristine 4ML-Pt/Pd(111) surface was ca. 4.5 times higher than that of clean Pt(111). Electrochemical stabilities were evaluated by applying square-wave potential cycles (PCs) between 0.6 and x V (x = 0.8, 0.85, 0.9 and 1.0; xV-PCs) in O2-saturated 0.1 M HClO4 at 80 °C. Although the 0.9V-and 1.0V-PCs cause ORR deactivation, the pristine ORR activities remained nearly unchanged by the 0.8V-and 0.85V-PCs even after 5000 PCs. The results suggest that the electrochemical structural stability of Pt/Pd core-shell type catalysts depends on the cell voltages used under the practical operating conditions of polymer electrolyte fuel cells.

Original languageEnglish
Title of host publicationPolymer Electrolyte Fuel Cells 16, PEFC 16
EditorsD. J. Jones, H. Uchida, H. A. Gasteiger, K. Swider-Lyons, F. N. Buchi, P. N. Pintauro, B. S. Pivovar, K. E. Ayers, K. A. Perry, P. Shirvanian, A. Z. Weber, V. K. Ramani, P. Strasser, R. A. Mantz, K. Shinohara, S. Mitsushima, C. Coutanceau, J. M. Fenton, T. J. Schmidt, T. F. Fuller, S. R. Narayanan, Y. T. Kim, L. Zhuang, S. G. Sun
PublisherElectrochemical Society Inc.
Number of pages6
ISBN (Electronic)9781607687313, 9781607687672, 9781607687689, 9781607687696, 9781607687702, 9781607687719, 9781607687726, 9781607687733, 9781607687740, 9781607687757, 9781607687771, 9781607687788, 9781607687795, 9781607687801, 9781607687818, 9781607687825, 9781607687832, 9781607687849, 9781607687856, 9781607687863, 9781607687887, 9781607687894, 9781607687900, 9781607687917, 9781607687924, 9781607687931, 9781607687948, 9781607687955, 9781607687962, 9781607687979, 9781607687986, 9781607687993, 9781607688006, 9781607688013, 9781607688020, 9781607688037
Publication statusPublished - 2016
EventSymposium on Polymer Electrolyte Fuel Cells 16, PEFC 2016 - PRiME 2016/230th ECS Meeting - Honolulu, United States
Duration: 2016 Oct 22016 Oct 7

Publication series

NameECS Transactions
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862


ConferenceSymposium on Polymer Electrolyte Fuel Cells 16, PEFC 2016 - PRiME 2016/230th ECS Meeting
Country/TerritoryUnited States


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