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      https://www.ias.ac.in/article/fulltext/jcsc/129/09/1399-1410

    • Keywords

       

      Electrodeposition; mechanism; platinum nanoparticles; carbon nanotubes; catalyst.

    • Abstract

       

      The electrodeposition of platinum nanoparticles (PtNPs) on multiwall carbon nanotubes (MWCNTs)/fluorine-doped tin oxide glass (FTO) was investigated. Nucleation and growth mechanisms were studied via Scharifker and Hills model. Chronoamperometry results clearly show that the electrodepositionprocesses are diffusion-controlled and the diffusion coefficient is 1.5×10 ⁻⁵ cm ²/s. The semi-spherical particles with lamellar morphology were observed in 1M H2SO4, while a petal shape was discerned in 0.5M H ₂SO ₄. Also, dispersion, size, and uniformity of PtNPs were investigated, where the finer distribution of PtNPs with the average size less than 100 nm was obtained in 0.5M H ₂SO ₄ solution, and the mean diameter of Pt crystals was 20 nm. Finally, the electro-oxidation of methanol and oxygen reduction studied via cyclic voltammetry showed that as-prepared PtNPs/MWCNTs electrodes had superb electrocatalytic activity.

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