We present an investigation of the alloying effects of 3d transition metals with palladium, and on their activity towards the oxygen reduction reaction (ORR) in alkaline media, as well as the durability of the electrocatalysts over time. Bimetallic Pd-M (M = Fe, Co and Ni) nanoparticles (NPs) were prepared by an impregnation method followed by reduction under forming gas and a subsequent annealing treatment. In order to enhance the catalytic activity towards the ORR, the bimetallic Pd-M nanoparticles were electrochemically dealloyed. The dealloyed Pd-M nanoparticles had a core-shell structure with a Pd3M-core and a Pd-shell about 1 nm in thickness. The core-shell materials exhibited higher electrocatalytic activity towards the ORR, and longer-term durability when compared to pure Pd.
Bibliographical noteFunding Information:
This work was financially supported by the Strategic Research Base Development Program for Private Universities of the Ministry of Education , Culture, Sports, Science and Technology of Japan and JSPS KAKENHI Grant Number 16K05945 . Part of this work was supported by the National Institute for Materials Science ( NIMS ) microstructural characterization platform as a program of “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This material is also based upon work supported as part of the Energy Materials Center at Cornell (EMC 2 ), an Energy Frontier Research Center funded by the U.S. Department of Energy , Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001086 . This work made use of the Cornell Center for Materials Research Shared Facilities which are supported through the NSF MRSEC program ( DMR-1120296 ). The authors are grateful to Dr. Eiji Ikenaga and Dr. Akira Yasui for their help in HAXPES measurements at BL47XU of SPring-8 (Proposal No. 2016A1668 ).
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All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)