Preparation of monodispersed ultra-small PtCu alloy with remarkable electrocatalytic performance
2017
Without the assistance of sufactant, CuCl 2 was reduced
by NaBH 4 to form Cu nanoparticles, which acted as second
dispersant during the preparation of PtCu alloy. The obtained PtCu
of 2.1 nm was supported on Vulcan XC72. The PtCu/C
showed lattice compression, Pt surface segregation, and high ratio
of non-oxidized Pt with high electronic binding energy. All those
structure feature contributed to weak adsorption strength of OHads
on Pt, which had benefit on ORR. According to half cell test, the
area specific activity and mass activity of PtCu/C reached 6.6 and
3.8 times that of Pt/C at 0.9 V vs. RHE. What’s more, after
degradation test of 10000 cycles, the superiority of PtCu/C towards
Pt/C remained. At 100 mA/cm 2 in single cell test, ultra-small
PtCu/C displayed superior performance and stability. Besides, this
method in this article can also be used to synthesize supported ultra-small
alloy, such as PtCo and PtNi.
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