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<p>Ethylene glycol (EG) is an attractive anodic fuel for direct alcohol fuel cells (DAFCs) due to its high energy density, low volatility, and comparatively low toxicity. Its electrooxidation in acidic medium is accompanied by strongly adsorbed intermediates, leading to low catalytic efficiency. Pt-Pd nanoparticles (NPs) supported on reduced graphene oxide (rGO) were synthesized by a modified hydrothermal method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Electrochemical performance was investigated by the cyclic voltammetry (CV) method in the acidic electrolyte, using Pt/rGO and commercial Pt/C as reference catalysts. Pt-Pd/rGO showed the highest ECSA (72.3 m<sup>2</sup> g<sup>− 1</sup>), compared with Pt/rGO (62.8 m<sup>2</sup> g<sup>− 1</sup>) and Pt/C (54.5 m<sup>2</sup> g<sup>− 1</sup>). It also provided a forward peak current density of 63.5&#xa0;mA cm<sup>− 2</sup>, a forward-to-backward peak current ratio (<i>I</i><sub>f</sub>/<i>I</i><sub>b</sub>) of 1.4 and a mass activity of 3587&#xa0;mA mgPt<sup>− 1</sup>, higher than Pt/rGO and Pt/C. These results show the improved Pt utilization and EG oxidation performance of Pt-Pd/rGO in acidic medium, indicating its potential as an anode electrocatalyst for direct ethylene glycol fuel cells.</p> Graphical abstract <p></p>

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Ethylene glycol electrooxidation on Pt–Pd nanoparticles supported on reduced graphene oxide in acidic medium

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Kadiri Chennammagari Vikram,
  • Machireddy Narendra Reddy,
  • Mopuri Vijaya Shiny,
  • Somala Adinarayana Reddy,
  • Loka Subramanyam Sarma

摘要

Ethylene glycol (EG) is an attractive anodic fuel for direct alcohol fuel cells (DAFCs) due to its high energy density, low volatility, and comparatively low toxicity. Its electrooxidation in acidic medium is accompanied by strongly adsorbed intermediates, leading to low catalytic efficiency. Pt-Pd nanoparticles (NPs) supported on reduced graphene oxide (rGO) were synthesized by a modified hydrothermal method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Electrochemical performance was investigated by the cyclic voltammetry (CV) method in the acidic electrolyte, using Pt/rGO and commercial Pt/C as reference catalysts. Pt-Pd/rGO showed the highest ECSA (72.3 m2 g− 1), compared with Pt/rGO (62.8 m2 g− 1) and Pt/C (54.5 m2 g− 1). It also provided a forward peak current density of 63.5 mA cm− 2, a forward-to-backward peak current ratio (If/Ib) of 1.4 and a mass activity of 3587 mA mgPt− 1, higher than Pt/rGO and Pt/C. These results show the improved Pt utilization and EG oxidation performance of Pt-Pd/rGO in acidic medium, indicating its potential as an anode electrocatalyst for direct ethylene glycol fuel cells.

Graphical abstract