Journal
CHEMISTRY OF MATERIALS
Volume 30, Issue 5, Pages 1532-1539Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b04201
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Funding
- ARPA-E [ED-EE0007271]
- National Science Foundation Materials Research Science and Engineering Center (NSF MRSEC) program [DMR-1120296]
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A facile, seed-mediated growth method and postannealing treatment have been employed to synthesize a single-phase 40% mass loading intermetallic Pt3Co/Vulcan electrocatalyst, enabling the electrocatalytic layer to be thinner and thus lowering the mass transport resistance for the ORR. in proton exchange membrane fuel cells (PEMFCs). These 40% Pt3Co/C nanocatalysts exhibited superior kinetics toward the ORR, relative to a 20% Pt3Co/C catalyst, and only showed a slight degradation in the half-wave potential and electro-chemical surface area after a 4000-cycle stability test. The high activity and stability are attributed to a stable intermetallic Pt3Co core with a Pt shell two to three atomic layers thick, as well as to its good dispersion on the support. This seed-mediated growth approach and postannealing treatment provide a new strategy to ensure single-phase formation and uniform particle size distribution for other high-mass-loading binary intermetallic/alloy electrocatalyst systems and can contribute to the practical commercialization of PEMFCs, especially in high-current-density applications, such as automotive.
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