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).
Highlights
Bimetallic Pt-based nanoparticles with varied metals addition to improve the electrocatalytic durability and anti-carbon monoxide (CO) poisoning ability have been paid attention in recent years, especially in the catalysts of the methanol oxidation reaction (MOR) for the direct methanol fuel cells (DMFC) applications [1,2,3,4,5]
Pt on carbon carbon nanoparticles (Pt/C) and Pt on Graphene (Pt/G) nanohybrids would be used as control
Nanoparticles (Pt/C) and Pt on Graphene (Pt/G) nanohybrids would be used as control
Summary
Bimetallic Pt-based nanoparticles with varied metals addition to improve the electrocatalytic durability and anti-carbon monoxide (CO) poisoning ability have been paid attention in recent years, especially in the catalysts of the methanol oxidation reaction (MOR) for the direct methanol fuel cells (DMFC) applications [1,2,3,4,5]. The durability is an important issue for direct methanol fuel cell application (DMFC) [9,10]. The Pt3 Ni bimetallic electrocatalysts on carbon-based substrates have been investigated the addition of transition metal‐based catalysts of Ni atom will be considered as a potential to catalyze the oxygen reduction reaction (ORR) [11]. It is the important issue to combine the bimetallic Pt-based nanoparticles and carbon-based carbon‐based substrates to enhance the electrocatalytic behaviors. Nanoparticles (Pt/C) and Pt on Graphene (Pt/G) nanohybrids would be used as control
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