摘要
L10-FePt nan oparticles(NPs)with high chemical ordering represent effective electrocatalysts to reduce the cost and enhance theircatalytic performanee in fuel cells.A molecular strategy of preparing highly ordered FePt NPs was used by direct pyrolysis of a Fe,Pt-containing bimetallic complex.The resultant L10-FePt NPs had very high crystallinity as reflected by the obvious diffractionpatterns,clear lattice fringes and characteristic X-ray diffraction peaks,etc.Besides,the strong ferromagnetism with room temperaturecoercivity of 27 kOe further confirmed the face-centered tetrag on al(fet)phase in good agreement with the ordered nano structures.TheFePt NPs can be used as electrocatalysts to catalyze oxygen reduction reaction(ORR)in an O2·saturated 0.1 M HClO4 solution andhydrogen evolution reaction(HER)in the 0.5 M H2SO4 electrolyte with much better performance than commercial Pt/C,and showedquite high stability after 10,000 cycles.The strategy utilizing orga no metallic precursors to prepare metal alloy NPs was dem on strated tobe a reliable approach for improving the catalytic efficiency in fuel cells.
基金
This work was supported by the National Natural Science Foundation of China(No.21701112)
Science,Technology and Innovation Committee of Shenzhen Municipality(No.JCYJ20170303160036674)
Hong Kong Research Grants Council(PolyU153062/18R C4006-17G and HKUST16304117)
the Hong Kong Polytechnic University(1-ZE1C)
Ms Clarea Au(847S)for the Endowed Professorship in Energy.Special thanks were also given to Instrumental Analysis Center of Shenzhen University(Xili Campus).
