کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6470574 | 1424111 | 2017 | 9 صفحه PDF | دانلود رایگان |
- Carbon supported chemically ordered PtFe nanoparticles (PtFe/C) with small average particle size (â¼5 nm) were synthesized.
- The PtFe/C catalyst was surface doped with Au and Cr.
- The obtained Au-PtFe/C and Cr-PtFe/C exhibited higher catalytic activity and stability than JM Pt/C toward the ORR.
The surface microstructure plays a key role in affecting the catalytic performances of platinum (Pt) base nanomaterials used for the oxygen reduction reaction (ORR) catalysts in fuel cell. In this work, carbon supported chemically ordered PtFe nanoparticles (PtFe/C) with small average particle size (â¼5Â nm) were effectively synthesized via a microwave-assisted polyol reduction process and followed by heat treatment. Then, the PtFe/C catalyst was surface doped with small amounts of transition metal Au and Cr. The structural characteristics of the as-synthesized catalysts were characterized by X-ray diffraction, transmission electron microscopy, inductively coupled plasma-atomic emission spectroscopy, X-ray photoelectron spectrometer, and energy dispersive spectrometer in association with high-angle annular dark field scanning transmission electron microscopy; the electrochemical performances were tested by cyclic voltammetry and linear sweep voltammetry using a rotating disk electrode. The mass activities of the as-synthesized catalysts toward the ORR increased in the order of PtFe/C (314Â mAÂ mgâ1Pt)Â <Â Au-PtFe/C (414Â mAÂ mgâ1Pt)Â <Â Cr-PtFe/C (487Â mAÂ mgâ1Pt); all the as-synthesized catalysts showed higher mass activity than that (158Â mAÂ mgâ1Pt) of JM Pt/C catalyst. Moreover, Au-PtFe/C and Cr-PtFe/C catalysts showed higher stability than JM Pt/C catalyst. The superior catalytic performances of these doped catalysts were attributed to the chemically ordered structure and the modified surface electric properties.
Journal: Electrochimica Acta - Volume 246, 20 August 2017, Pages 671-679