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<p>Electrocatalytic water splitting is a promising route for sustainable hydrogen production; however, its practical implementation is hindered by the sluggish kinetics of oxygen evolution reaction (OER) and the associated high anodic energy demand. In this study, methanol oxidation reaction (MOR) an alternative to OER is studied in the presence of an efficient electrocatalyst Fe<sub>2</sub>O<sub>3</sub>–Fe<sub>2</sub>CoO<sub>4</sub> with heterojunction. The catalyst is prepared by simple solvothermal method. The heterostructure catalyst showed good catalytic activity toward MOR. In 1&#xa0;M KOH, the optimized FCO-2 catalyst exhibits an onset potential of 0.515&#xa0;V vs. Ag/AgCl and delivers a current density of 10.37&#xa0;mA cm<sup>− 2</sup> at 0.65&#xa0;V for OER. Upon addition of 3 M methanol, the onset potential decreases markedly to 0.409&#xa0;V vs. Ag/AgCl, corresponding to a 106 mV reduction in potential as compared to OER. The catalyst further demonstrates an electrochemically active surface area of 8.54 mF cm<sup>− 2</sup> and a Tafel slope of 112.7 mV dec<sup>− 1</sup>. The catalyst exhibits a stability for 5000&#xa0;s in 1&#xa0;M KOH containing 1&#xa0;M methanol. These quantitative results confirm that heterojunction-driven MOR effectively lowers anodic energy input, offering a viable strategy for enhancing hydrogen production efficiency.</p>

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Bimetal oxide heterojunction-based electrocatalyst for methanol oxidation reaction

  • 期刊论文

  • 发表日期：

    2026年4月23日

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  • Sobia Yaseen,
  • Dariusz Guziejewski,
  • Fazal Mabood,
  • Aziz Ahmad,
  • Sami Ullah,
  • Nabi Ullah,
  • Lu Zaijun

摘要

Electrocatalytic water splitting is a promising route for sustainable hydrogen production; however, its practical implementation is hindered by the sluggish kinetics of oxygen evolution reaction (OER) and the associated high anodic energy demand. In this study, methanol oxidation reaction (MOR) an alternative to OER is studied in the presence of an efficient electrocatalyst Fe2O3–Fe2CoO4 with heterojunction. The catalyst is prepared by simple solvothermal method. The heterostructure catalyst showed good catalytic activity toward MOR. In 1 M KOH, the optimized FCO-2 catalyst exhibits an onset potential of 0.515 V vs. Ag/AgCl and delivers a current density of 10.37 mA cm− 2 at 0.65 V for OER. Upon addition of 3 M methanol, the onset potential decreases markedly to 0.409 V vs. Ag/AgCl, corresponding to a 106 mV reduction in potential as compared to OER. The catalyst further demonstrates an electrochemically active surface area of 8.54 mF cm− 2 and a Tafel slope of 112.7 mV dec− 1. The catalyst exhibits a stability for 5000 s in 1 M KOH containing 1 M methanol. These quantitative results confirm that heterojunction-driven MOR effectively lowers anodic energy input, offering a viable strategy for enhancing hydrogen production efficiency.