TY - JOUR
T1 - Lattice contracted ordered intermetallic core-shell PtCo@Pt nanoparticles
T2 - Synthesis, structure and origin for enhanced oxygen reduction reaction
AU - Yang, Wenhua
AU - Zou, Liangliang
AU - Huang, Qinghong
AU - Zou, Zhiqing
AU - Hu, Yemin
AU - Yang, Hui
N1 - Publisher Copyright:
© 2017 The Electrochemical Society.
PY - 2017
Y1 - 2017
N2 - Electrocatalysts in ordered intermetallic phases are highly desirable for the oxygen reduction reaction (ORR) with enhanced activity and durability. Here, we develop carbon-supported ordered core-shell PtCo@Pt (O-PtCo@Pt/C with the Pt:Co atomic ratio of 1:1) intermetallic compound (IMC) nanoparticles with the metal loading as high as of 60 wt%, aiming to understand the effects of the ordered structure, metal loading and particle size on the ORR performance. The O-PtCo@Pt/C is synthesized by a two-step reduction method and followed by a heat-treatment. The mean particle diameter is about 4.8 nm with a narrow size distribution. The surface of the core-shell nanoparticles is enriched with about 3 layers of Pt atoms after the acid treatment. Noticeable lattice contraction in the O-PtCo@Pt/C has been observed by X-ray diffraction and high resolution transmission electron microscopy. Such a structurally ordered PtCo@Pt/C catalyst exhibits higher ORR activity and durability than the disordered PtCo/C and commercial Pt/C catalysts, which could be ascribed to the Pt-rich shell, ordered core structure, small particle size, lattice contraction, as well as strengthened d-hybridization. This research provides new insights to design an ordered intermetallic structure in the core and a Pt-rich surface with special facets for the excellent catalytic performance.
AB - Electrocatalysts in ordered intermetallic phases are highly desirable for the oxygen reduction reaction (ORR) with enhanced activity and durability. Here, we develop carbon-supported ordered core-shell PtCo@Pt (O-PtCo@Pt/C with the Pt:Co atomic ratio of 1:1) intermetallic compound (IMC) nanoparticles with the metal loading as high as of 60 wt%, aiming to understand the effects of the ordered structure, metal loading and particle size on the ORR performance. The O-PtCo@Pt/C is synthesized by a two-step reduction method and followed by a heat-treatment. The mean particle diameter is about 4.8 nm with a narrow size distribution. The surface of the core-shell nanoparticles is enriched with about 3 layers of Pt atoms after the acid treatment. Noticeable lattice contraction in the O-PtCo@Pt/C has been observed by X-ray diffraction and high resolution transmission electron microscopy. Such a structurally ordered PtCo@Pt/C catalyst exhibits higher ORR activity and durability than the disordered PtCo/C and commercial Pt/C catalysts, which could be ascribed to the Pt-rich shell, ordered core structure, small particle size, lattice contraction, as well as strengthened d-hybridization. This research provides new insights to design an ordered intermetallic structure in the core and a Pt-rich surface with special facets for the excellent catalytic performance.
UR - http://www.scopus.com/inward/record.url?scp=85027840786&partnerID=8YFLogxK
U2 - 10.1149/2.0851706jes
DO - 10.1149/2.0851706jes
M3 - 文章
AN - SCOPUS:85027840786
SN - 0013-4651
VL - 164
SP - H331-H337
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 6
ER -
