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<p>The design of a high-performance electrocatalyst for ethanol oxidation is a key requirement for fabricating direct ethanol fuel cells with high efficiency and durability. Herein, palladium is integrated with MnO<sub>2</sub>/delaminated boron (B) to form MnO<sub>2</sub>-B-Pd nanocomposite. The ethanol electrooxidation studies of MnO<sub>2</sub>-B-Pd nanocomposite and Pd–C were investigated by recording cyclic voltammograms (<i>CV</i>s) in 2&#xa0;M NaOH + 2&#xa0;M ethanol, which revealed that MnO<sub>2</sub>-B-Pd nanocomposite demonstrated higher mass activity of 592.75&#xa0;mA&#xa0;mg<sup>−1</sup> Pd as compared to Pd–C. Furthermore, the onset potential for the forward scan for MnO<sub>2</sub>-B-Pd nanocomposite is more negative (− 0.233&#xa0;V), as compared to that of Pd–C (− 0.191&#xa0;V), which suggests a lower electrocatalytic activation barrier and thus improved reaction kinetics of ethanol. The kinetics studies revealed that MnO<sub>2</sub>-B-Pd has a faster charge transfer reaction (electron transfer rate constant (<i>k</i><sup>o</sup>) = 3.68 × 10<sup>−4</sup>), and the overall electron transfer is controlled by diffusion of the reactant at the electrode/electrolyte interfaces.</p>

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Palladium-integrated MnO2/delaminated boron nanocomposite as an efficient electrocatalyst toward ethanol electrooxidation in an alkaline medium

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  • 发表日期：

    2025年9月2日

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  • Mustapha Balarabe Idris,
  • Bhekie B. Mamba,
  • Fuku Xolile

摘要

The design of a high-performance electrocatalyst for ethanol oxidation is a key requirement for fabricating direct ethanol fuel cells with high efficiency and durability. Herein, palladium is integrated with MnO2/delaminated boron (B) to form MnO2-B-Pd nanocomposite. The ethanol electrooxidation studies of MnO2-B-Pd nanocomposite and Pd–C were investigated by recording cyclic voltammograms (CVs) in 2 M NaOH + 2 M ethanol, which revealed that MnO2-B-Pd nanocomposite demonstrated higher mass activity of 592.75 mA mg−1 Pd as compared to Pd–C. Furthermore, the onset potential for the forward scan for MnO2-B-Pd nanocomposite is more negative (− 0.233 V), as compared to that of Pd–C (− 0.191 V), which suggests a lower electrocatalytic activation barrier and thus improved reaction kinetics of ethanol. The kinetics studies revealed that MnO2-B-Pd has a faster charge transfer reaction (electron transfer rate constant (ko) = 3.68 × 10−4), and the overall electron transfer is controlled by diffusion of the reactant at the electrode/electrolyte interfaces.