Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 15, Issue 11, Pages 3793-3802Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp44191a
Keywords
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Funding
- NSFC [21073094, 21005039, 21273116]
- United Fund of NSFC and Yunnan Province [U1137602]
- Industry-Academia Cooperation Innovation Fund Project of Jiangsu Province [BY2012001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The synthesis of Pt nanocrystals with controlled size and morphology has drawn enormous interest due to their particular catalytic activity. We present a facile and green hydrothermal method for synthesizing monodisperse Pt nanocubes (Pt-NCs) with polyallylamine hydrochloride (PAH) as a complex-forming agent, capping agent and facet-selective agent, and formaldehyde as a reductant. The formation mechanism, particle size and surface composition of the Pt-NCs were investigated by Ultraviolet and visible spectroscopy (UV-vis), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), etc. In the proposed PAH-K2PtCl4-HCHO synthesis system, the raw material could be reutilized to re-synthesize the Pt-NCs, and the particle size of the Pt-NCs could be readily controlled by the reduction rate of the Pt-II species in the Pt-II-PAH complex. After UV/Ozone and electrochemical cleaning, the residual PAH on the Pt-NC surfaces still strongly influenced the d-band centre of Pt due to the strong N-Pt interaction. The as-prepared 6 nm Pt-NCs showed superior electrocatalytic activity (mass activity and specific activity) and stability towards the oxygen reduction reaction (ORR) in both H2SO4 and HClO4 electrolytes compared to the commercial E-TEK Pt black, owing to the combination of the facets effect and electronic effect.
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