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<p>In this study, we present a simple and efficient microwave solvothermal method for producing nanostructured UiO-66 (M-U) and UiO-66-NH₂ (M-U-N) MOFs, aimed at optimizing their electrocatalytic performance. By exploring the bifunctional capabilities of these materials, we seek to uncover their potential in enhancing the kinetics of both the HER and the OER, thus paving the way for more efficient water-splitting systems. Characterization via X-ray diffraction and Fourier-transform infrared spectroscopy confirms their crystalline structures and functional groups. M-U-N exhibits a lower indirect bandgap of 2.7&#xa0;eV compared to 3.3&#xa0;eV for M-U, with M-U comprised of smaller, nearly spherical particles, while M-U-N shows signs of agglomeration. In terms of oxygen evolution reaction performance, M-U displays superior activity with an overpotential of 368 mV at 20&#xa0;mA/cm² and a slope of 234 mV/decade, attributed to its higher oxygen content and larger surface area. Stability tests confirm M-U’s robustness, exhibiting only a 4 mV change in overpotential after 1,000 cycles of cyclic voltammetry. For hydrogen evolution reaction performance, M-U-N demonstrates a lower overpotential of 180 mV at 10&#xa0;mA/cm², benefiting from nitrogen donor sites that facilitate proton reduction. Polarization curves indicate minimal change in overpotential after 1,000 cycles, reflecting excellent stability. Both samples show increased current density and larger voltammogram areas at higher scan rates, indicating effective charge transfer. Overall, M-U exhibits superior performance for OER, while M-U-N excels in HER, highlighting their potential for efficient water splitting.</p> Graphical Abstract <p></p>

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Facile microwave synthesis of nanostructured UiO-66 and UiO-66-NH2 MOFs and exploring their bifunctional electrocatalytic capabilities for efficient water splitting

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Batol Abbas,
  • A. V. Ravindra

摘要

In this study, we present a simple and efficient microwave solvothermal method for producing nanostructured UiO-66 (M-U) and UiO-66-NH₂ (M-U-N) MOFs, aimed at optimizing their electrocatalytic performance. By exploring the bifunctional capabilities of these materials, we seek to uncover their potential in enhancing the kinetics of both the HER and the OER, thus paving the way for more efficient water-splitting systems. Characterization via X-ray diffraction and Fourier-transform infrared spectroscopy confirms their crystalline structures and functional groups. M-U-N exhibits a lower indirect bandgap of 2.7 eV compared to 3.3 eV for M-U, with M-U comprised of smaller, nearly spherical particles, while M-U-N shows signs of agglomeration. In terms of oxygen evolution reaction performance, M-U displays superior activity with an overpotential of 368 mV at 20 mA/cm² and a slope of 234 mV/decade, attributed to its higher oxygen content and larger surface area. Stability tests confirm M-U’s robustness, exhibiting only a 4 mV change in overpotential after 1,000 cycles of cyclic voltammetry. For hydrogen evolution reaction performance, M-U-N demonstrates a lower overpotential of 180 mV at 10 mA/cm², benefiting from nitrogen donor sites that facilitate proton reduction. Polarization curves indicate minimal change in overpotential after 1,000 cycles, reflecting excellent stability. Both samples show increased current density and larger voltammogram areas at higher scan rates, indicating effective charge transfer. Overall, M-U exhibits superior performance for OER, while M-U-N excels in HER, highlighting their potential for efficient water splitting.

Graphical Abstract