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Catalysts 2016, 6(12), 201; doi:10.3390/catal6120201

Synthesis of PtNi Alloy Nanoparticles on Graphene-Based Polymer Nanohybrids for Electrocatalytic Oxidation of Methanol

1
Nuclear Fuels and Materials Division, Institute of Nuclear Energy Research, Lontang, Taoyuan 325, Taiwan
2
Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
3
Guangzhou Wells Electronic Material Co. Ltd., Guangzhou 510530, China
4
Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan
*
Authors to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Received: 10 September 2016 / Revised: 26 November 2016 / Accepted: 6 December 2016 / Published: 11 December 2016
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Abstract

We have successfully produced bimetallic PtNi alloy nanoparticles on poly(diallyldimethylammonium chloride) (PDDA)-modified graphene nanosheets (PtNi/PDDA-G) by the “one-pot” hydrothermal method. The size of PtNi alloy nanoparticles is approximately 2–5 nm. The PDDA-modified graphene nanosheets (PDDA-G) provides an anchored site for metal precursors; hence, the PtNi nanoparticles could be easily bond on the PDDA-G substrate. PtNi alloy nanoparticles (2–5 nm) display a homogenous alloy phase embedded on the PDDA-G substrate, evaluated by Raman, X-ray diffractometer (XRD), thermal gravity analysis (TGA), electron surface chemical analysis (ESCA), and electron energy loss spectroscopy (EELS). The Pt/Ni ratio of PtNi alloy nanoparticles is ~1.7, examined by the energy dispersive spectroscopy (EDS) spectra of transmitting electron microscopy (EDS/TEM spectra) and mapping technique. The methanol electro-oxidation of PtNi/PDDA-G was evaluated by cyclic voltammetry (CV) in 0.5 M of H2SO4 and 0.5 M of CH3OH. Compared to Pt on carbon nanoparticles (Pt/C) and Pt on Graphene (Pt/G), the PtNi/PDDA-G exhibits the optimal electrochemical surface area (ECSA), methanol oxidation reaction (MOR) activity, and durability by chrono amperometry (CA) test, which can be a candidate for MOR in the electro-catalysis of direct methanol fuel cells (DMFC). View Full-Text
Keywords: PtNi alloy nanoparticles; graphene; electrocatalyst; methanol oxidation reaction (MOR); direct methanol fuel cells (DFMC) PtNi alloy nanoparticles; graphene; electrocatalyst; methanol oxidation reaction (MOR); direct methanol fuel cells (DFMC)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yung, T.-Y.; Liu, T.-Y.; Wang, K.-S.; Liu, C.-C.; Wang, S.-H.; Chen, P.-T.; Chao, C.-Y. Synthesis of PtNi Alloy Nanoparticles on Graphene-Based Polymer Nanohybrids for Electrocatalytic Oxidation of Methanol. Catalysts 2016, 6, 201.

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