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<p>In this study, a PtNi nanocomposite supported on reduced graphene oxide (rGO) was synthesized via a chemical reduction method, and its electrocatalytic performance for the electrochemical oxidation of sodium borohydride (NaBH₄) was investigated. The structural and morphological properties of the synthesized PtNi@rGO nanocomposite were characterized in detail using FTIR, XRD, TEM, and SEM-EDX analyses. The characterization results demonstrated that the PtNi alloy nanoparticles were successfully immobilized on the rGO surface and were homogeneously distributed in the 20–50&#xa0;nm size range. Electrochemical performance studies were conducted using the cyclic voltammetry method in a solution containing 1&#xa0;M NaOH and 0.1&#xa0;M NaBH₄. The results revealed that the PtNi@rGO electrocatalyst achieved a maximum current density of 19.57&#xa0;mA cm⁻², while under the same conditions, the PtNi and Pt electrodes exhibited values of 17.19 and 6.53&#xa0;mA cm⁻², respectively. Furthermore, the determined initial potential of 0.13&#xa0;V for PtNi@rGO indicated a faster reaction kinetics compared to the PtNi (0.17&#xa0;V) and Pt (0.22&#xa0;V) electrodes. Analyses conducted at different scan rates demonstrated that the reaction proceeded in a kinetically controlled manner and that the rGO support significantly improved charge transfer processes. Long-term stability tests have demonstrated that the developed nanocomposite maintains its electrocatalytic performance. The results indicate that the PtNi@rGO nanocomposite is a stable and promising electrocatalyst with high activity for hydrogen production via the electrooxidation of NaBH₄.</p>

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Enhanced borohydride electrocatalysis through electronic coupling of PtNi nanomaterials and reduced graphene oxide

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月2日

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  • Ebru Halvacı,
  • Ramazan Bayat,
  • Abdullah Seyrankaya,
  • Mustafa Ucar,
  • Fatih Sen

摘要

In this study, a PtNi nanocomposite supported on reduced graphene oxide (rGO) was synthesized via a chemical reduction method, and its electrocatalytic performance for the electrochemical oxidation of sodium borohydride (NaBH₄) was investigated. The structural and morphological properties of the synthesized PtNi@rGO nanocomposite were characterized in detail using FTIR, XRD, TEM, and SEM-EDX analyses. The characterization results demonstrated that the PtNi alloy nanoparticles were successfully immobilized on the rGO surface and were homogeneously distributed in the 20–50 nm size range. Electrochemical performance studies were conducted using the cyclic voltammetry method in a solution containing 1 M NaOH and 0.1 M NaBH₄. The results revealed that the PtNi@rGO electrocatalyst achieved a maximum current density of 19.57 mA cm⁻², while under the same conditions, the PtNi and Pt electrodes exhibited values of 17.19 and 6.53 mA cm⁻², respectively. Furthermore, the determined initial potential of 0.13 V for PtNi@rGO indicated a faster reaction kinetics compared to the PtNi (0.17 V) and Pt (0.22 V) electrodes. Analyses conducted at different scan rates demonstrated that the reaction proceeded in a kinetically controlled manner and that the rGO support significantly improved charge transfer processes. Long-term stability tests have demonstrated that the developed nanocomposite maintains its electrocatalytic performance. The results indicate that the PtNi@rGO nanocomposite is a stable and promising electrocatalyst with high activity for hydrogen production via the electrooxidation of NaBH₄.