过生长法制备准凹面体状Pt-Ni纳米合金及其甲醇氧化电催化性能

doi:10.3866/PKU.WHXB201401222

Abstract

Abstract:

Quasi-concave Pt-Ni alloy nanostructures were synthesized via a solvothermal method, and were thought to form by epitaxial growth on the 12 vertexes of a cuboctahedron. A simultaneous etchingovergrowth process was proposed to illustrate the growth mechanism. The epitaxial layer was of different composition from the core, as confirmed by high-resolution transmission electron microscopy, selectedarea electron diffraction and powder X-ray diffraction characterizations. The concave structures exhibited high catalytic activity towards methanol oxidation. The mass-normalized catalytic activity of the concave products was ~3 times that of pure Pt nanoparticles synthesized under similar conditions, and 13.6 times that of commercial Pt/C. X-ray photoelectron spectroscopy characterization indicated that the binding energy of the concave structures shifted to lower energy, relative to the pure Pt. The modified electronic structure by introducing Ni was thought to be responsible for the enhanced catalytic activity.

Key words: Overgrowth, Quasi-concave, Pt-Ni, Methanol oxidation reaction, Electrocatalysis

MSC2000:

O643

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WANG Chun, KANG Jian-Xin, WANG Li-Li, CHEN Ting-Wen, LI Jie, ZHANG Dong-Feng, GUO Lin. Synthesis of Quasi-Concave Pt-Ni Nanoalloys via Overgrowth and Their Catalytic Performance towards Methanol Oxidation[J].Acta Phys. -Chim. Sin., 2014, 30(4): 708-714.

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Synthesis of Quasi-Concave Pt-Ni Nanoalloys via Overgrowth and Their Catalytic Performance towards Methanol Oxidation

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