Optimal coordination-site exposure engineering in porous platinum for outstanding oxygen reduction performance.

ABSTRACT: In this study, we report that optimal coordination-site exposure engineering in porous platinum brings ultrahigh activity and durability for the fuel cell oxygen reduction reaction (ORR). The porous platinum with numerous grain boundaries (GBP-Pt) consisting of 3 nm crystals exhibits 7 times higher ORR activity than commercial Pt. For fuel-cell measurements, the GBP-Pt catalyst based MEA exhibits high power density (1.49 W cm^-2, 0.71 A mg^-1 Pt for mass activity) and stability (12.9% loss after 30 K cycles), all of which far surpass the U.S. DOE target in 2020 (0.44 A mg^-1 Pt for mass activity and 40% loss for stability). Density Functional Theory (DFT) calculation and X-ray Absorption Fine Structure (XAFS) results suggest that proper Pt coordination site ex

SUBMITTER: Cheng H 

PROVIDER: S-EPMC6552488 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature