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Optimizing PtFe intermetallics for oxygen reduction reaction: from DFT screening to XAFS characterization
Ist Teil von
Nanoscale, 2019-10, Vol.11 (42), p.231-236
Erscheinungsjahr
2019
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Rational designing of catalysts to promote the sluggish kinetics of the cathode oxygen reduction reaction in proton exchange membrane fuel cells is still challenging, yet of crucial importance to its commercial application. In this work, on the basis of theoretical DFT calculations which suggest that order structured
fct
-phased PtFe (O-PtFe) with an atomic Pt shell exhibits superior electrocatalytic performance towards the ORR, the desired structure was prepared by using a scalable impregnation-reduction method. The as-prepared O-PtFe delivered enhanced activity (0.68 A mg
−1
Pt
) and stability (73% activity retention after 10 000 potential cycles) compared with the corresponding disordered PtFe alloy (D-PtFe) and Pt. To confirm the excellent durability,
in situ
X-ray absorption fine structure spectroscopy was conducted to probe the local and electronic structure changes of O-PtFe during 10 000 cycle accelerated durability testing. We hope that this facile synthesis method and the
in situ
XAFS experiment could be readily adapted to other catalyst systems, facilitating the screening of highly efficient ORR catalysts for fuel cell application.
Ordered PtFe with an atomic Pt shell has been successfully synthesized and delivers enhanced performance towards the ORR.
Sprache
Englisch
Identifikatoren
ISSN: 2040-3364
eISSN: 2040-3372
DOI: 10.1039/c9nr04975d
Titel-ID: cdi_rsc_primary_c9nr04975d
Format
–
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