Controlled synthesis of reduced graphene oxide-supported bimetallic Pt–Au nanoparticles for enhanced electrooxidation of methanol
Solid State Sciences, ISSN: 1293-2558, Vol: 149, Page: 107469
2024
- 6Citations
- 4Captures
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Article Description
Controlled construction of bimetallic interfaces on conductive carbon supports is extremely important for achieving better synergistic effect required for electrooxidation of small organic molecules for energy applications. Herein, controlled synthesis of reduced graphene oxide (RGO)-supported bimetallic Pt–Au nanoparticles (Pt–Au/RGO) for electrooxidation of methanol using a facile and practical approach was described. By carefully adapting sequential and simultaneous reduction steps H 2 PtCl 6 and AuCl 3 were reduced on RGO support using ammonia borane (AB) and ascorbic acid (AA) as reducing agents. Three types of Pt–Au/RGO catalysts were prepared and labeled as PtAu/RGO-AB 1, PtAu/RGO-AB, and PtAu/RGO-AA. The reduction process was carried at ambient conditions, without the use of surfactants, and the catalysts obtained were analyzed through various techniques, including X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and energy dispersive X-ray spectroscopy (EDS). The PtAu/RGO-AB 1 catalyst showed remarkable uniformity on the RGO sheets, with an average particle size of 2–3 nm. The electrochemical behavior of Pt–Au catalysts supported on reduced graphene oxide (RGO) for methanol oxidation was systematically investigated via cyclic voltammetry and chronoamperometry techniques. Among the studied catalysts, PtAu/RGO-AB 1 exhibited high electrochemical active surface area (ECSA) of 92.47 m 2 /g, along with the highest mass and ECSA-normalized activities for the electrooxidation of methanol. PtAu/RGO-AB 1 manifested exceptional resistance to accumulated CO-like species, as evidenced by its higher forward peak current density to reverse peak current density ratio (I f / I b ) of 2.20. The facile and effective synthesis strategy described here provides a promising method for fabricating well-defined multi-component nanostructured electrocatalysts with potential applications for various fuel cell reactions.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1293255824000347; http://dx.doi.org/10.1016/j.solidstatesciences.2024.107469; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85184052784&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1293255824000347; https://dx.doi.org/10.1016/j.solidstatesciences.2024.107469
Elsevier BV
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