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<p>The escalating demand for sustainable energy amid fossil fuel depletion and environmental crises has propelled research into advanced electrocatalysts for direct alcohol fuel cells (DAFCs). This study introduces a pioneering CoNi₂O₄/MXene nanocomposite, synthesized via a one-step hydrothermal method, as a high-performance anode catalyst for the methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR), outperforming pristine CoNi₂O₄. Unlike prior works focusing on single-metal or loosely integrated composites such as nickel ferrite/MXene or Ni nanoparticles on Mxene this hybrid uniquely leverages the spinel structure of CoNi₂O₄ with its mixed oxidation states (Co²⁺/Co³⁺ and Ni²⁺/Ni³⁺) and MXene’s (Ti₃C₂) layered conductivity, achieving unprecedented synergy for enhanced electron transfer, active site exposure, and CO poisoning resistance. Physical analyses (XRD, FESEM, BET) confirmed successful integration, revealing a doubled specific surface area (109.36 vs. 61.64 m²/g) and porous fibrous morphology. Electrochemical evaluations showed superior activity with significantly enhanced peak current densities and lower oxidation potentials for both MOR and EOR compared to pristine CoNi₂O₄, alongside exceptional stability (94.6% and 91.6% retention after 1000 cycles at 100 mV/s). Lower Tafel slopes (138 mV/dec for MOR, 72.6 mV/dec for EOR) and reduced charge transfer resistance (&lt;7 Ω) underscore its edge over noble metal alternatives. This transformative design not only addresses scalability and durability gaps in existing catalysts but also paves the way for cost-effective, efficient DAFCs in renewable energy applications.</p><p></p>

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Electrocatalytic oxidation of methanol and ethanol on CoNi₂O₄/MXene hybrid catalysts for direct alcohol fuel cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Fatemeh Jamali,
  • Majid Seifi,
  • Mohammad Bagher Askari

摘要

The escalating demand for sustainable energy amid fossil fuel depletion and environmental crises has propelled research into advanced electrocatalysts for direct alcohol fuel cells (DAFCs). This study introduces a pioneering CoNi₂O₄/MXene nanocomposite, synthesized via a one-step hydrothermal method, as a high-performance anode catalyst for the methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR), outperforming pristine CoNi₂O₄. Unlike prior works focusing on single-metal or loosely integrated composites such as nickel ferrite/MXene or Ni nanoparticles on Mxene this hybrid uniquely leverages the spinel structure of CoNi₂O₄ with its mixed oxidation states (Co²⁺/Co³⁺ and Ni²⁺/Ni³⁺) and MXene’s (Ti₃C₂) layered conductivity, achieving unprecedented synergy for enhanced electron transfer, active site exposure, and CO poisoning resistance. Physical analyses (XRD, FESEM, BET) confirmed successful integration, revealing a doubled specific surface area (109.36 vs. 61.64 m²/g) and porous fibrous morphology. Electrochemical evaluations showed superior activity with significantly enhanced peak current densities and lower oxidation potentials for both MOR and EOR compared to pristine CoNi₂O₄, alongside exceptional stability (94.6% and 91.6% retention after 1000 cycles at 100 mV/s). Lower Tafel slopes (138 mV/dec for MOR, 72.6 mV/dec for EOR) and reduced charge transfer resistance (<7 Ω) underscore its edge over noble metal alternatives. This transformative design not only addresses scalability and durability gaps in existing catalysts but also paves the way for cost-effective, efficient DAFCs in renewable energy applications.