Abstract
Controlling the atomic arrangement of elemental atoms in intermetallic catalysts to govern their surface and subsurface properties is a crucial but challenging endeavor in electrocatalytic reactions.In hydrogen evolution reaction(HER),adjusting the d-band center of the conventional noble-metallic Pt by introduc-ing Fe enables the optimization of catalytic performance.However,a notable gap exists in research on the effective transition from disordered Fe/Pt alloys to highly ordered intermetallic compounds(IMCs)such as FePt3 in the alkaline HER,hampering their broader application.In this study,a series of catalysts FePt3-xH(x=5,6,7,8 and 9)supported on carbon nanotubes(CNTs)were synthesized via a simple impregnation method,along with a range of heat treatment processes,including annealing in a reductive atmosphere,to regulate the order degree of the arrangement of Fe/Pt atoms within the FePt3 catalyst.By using advanced microscopy and spectroscopy techniques,we systematically explored the impact of the order degree of FePt3 in the HER.The as-prepared FePt3-8H exhibited notable HER catalytic activity with low overpotentials(η=37 mV in 1.0 mol L-1 KOH)at j=10 mA cm-2.The surface of the L12 FePt3-8H catalyst was demonstrated to be Pt-rich.The Pt on the surface was not easily oxidized due to the unique Fe/Pt coordination,resulting in significant enhancement of HER performance.
基金项目
National Natural Science Foundation of China(51872115)
National Natural Science Foundation of China(52101256)
Beijing Synchrotron Radiation Facility(BSRF)(4B9A)
NETL
NSTL
万方数据