Synthesis and characterization of Pt3Co bimetallic nanoparticles supported on MWCNT as an electrocatalyst for methanol oxidation
محورهای موضوعی : Iranian Journal of CatalysisMohammad Hossein Nobahari 1 , Ahmad Nozad Golikand 2 , Mojtaba Bagherzadeh 3
1 - Department of Chemistry, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran.
2 - Department of Chemistry, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran.|Material and Nuclear Fuel Research School, NSTRI, Tehran, Iran.
3 - Material and Nuclear Fuel Research School, NSTRI, 81465-1589, Isfahan, Iran.
کلید واژه: Pt3Co electrocatalyst, Methanol oxidation reaction, Electrochemical activity, Direct methanol fuel cells,
چکیده مقاله :
The impregnation method was used to synthesize Pt and Pt3Co supported on MWCNTs applying NaBH4 as the reducing agent. The structure, morphology, and chemical composition of the electrocatalysts were characterized through SEM, XRD, and EDX. X-ray diffraction showed a good crystallinity of the supported Pt nanoparticles on the composites and showed the formation of Pt3Co alloy. The SEM images revealed that the particles of Pt3Co were deposited uniformly on the surface of MWCNT with a diameter of 10 nm. EDX analysis confirmed the surface segregation of Co and Pt occurred (1:3 surface atomic ratio Pt-Co) for the Pt3Co/MWCNT nanocomposite. The Pt3Co/MWCNTs and Pt/MWCNTs electrocatalysts’ electrochemical performance was assessed against the methanol oxidation reaction (MOR) in 0.5 M H2SO4 solution using the chronoamperometry (CA) and the cyclic voltammetry (CV) methods. The minimum onset potential and the largest oxidation current density were obtained at Pt3Co/MWCNTs electrocatalyst. The Pt3Co/MWCNT catalyst with a good alloying degree has been shown to have better anti-poisoning ability, electrochemical activity, and long-term durability than Pt/MWCNT catalysts, approved by the bimetallic catalysts’ bi-functional mechanism.
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