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<p>Our reliance on electronic devices has led to an unprecedented surge in electricity demand met mostly by non-renewable sources. We are in an urgent need for transition to renewable energy sources to protect our planet. Photo-electrochemical electrolysis is a promising approach to green energy generation, has garnered a significant attention. This study examines the BiVO<sub>4</sub> incorporated Zirconium Metal-Oxide Framework nanocomposite material's potential as an effective Photo-Electrochemical water-splitting catalyst. The Zr-MOF/BiVO<sub>4</sub> was prepared using a Solvothermal process. X-ray diffraction (XRD) pattern confirmed the formation crystalline Zr-MOF. Fourier Transform Infrared Spectroscopy (FTIR) exhibited the typical functional groups and Raman spectroscopy also confirmed vibrational spectra matching Zr—µ<sup>3</sup>O and V—O. Furthermore, scanning electron microscopy (SEM) shows distinct Zr-MOF particles and agglomerated Zr-MOF/BiVO<sub>4</sub> with uniform size distribution. Tauc plot calculated from UV–Vis diffuse reflectance spectroscopy indicated Zr-MOF and Zr-MOF/BiVO4 to be 3.85&#xa0;eV and 3.56&#xa0;eV respectively. When compared to Zr-MOF, incorporating BiVO<sub>4</sub> into Zr-MOF increases the photocatalytic response significantly. Owing to improved charge separation and decreased electron–hole recombination, electrochemical studies conducted under simulated sunlight showed a notable improvement in the composite's hydrogen evolution rates. The incorporation of bismuth vanadate (BiVO<sub>4</sub>) aimed to leverage its suitable band gap and high absorption capacity in the visible light region while also increasing active sites due to defect formation. To study the electrochemical properties of the materials cyclic voltammetry and linear sweep voltammetry were performed. Additionally, Electrochemical Impedance Spectroscopy (EIS) were used to investigate charge transfer mechanisms. It shows very low electron transfer resistance of about 50 Ω for Zr-MOF/BiVO<sub>4</sub>. The electrochemical studies showed the composite material required very low over potential of 340&#xa0;mV for oxygen evolution reaction (OER) and 0.3&#xa0;mV for Hydrogen Evolution Reactions (HER) to achieve current density of 10&#xa0;mA/cm<sup>2</sup>.</p>

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Enhancing the photo-electrochemical hydrogen evolution efficiency of Zirconium-Metal-Oxide framework heterojunction by Solvothermal method

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Nirmalkumar Sivaraj,
  • A. Bharathi Sankar Ammaiyappan

摘要

Our reliance on electronic devices has led to an unprecedented surge in electricity demand met mostly by non-renewable sources. We are in an urgent need for transition to renewable energy sources to protect our planet. Photo-electrochemical electrolysis is a promising approach to green energy generation, has garnered a significant attention. This study examines the BiVO4 incorporated Zirconium Metal-Oxide Framework nanocomposite material's potential as an effective Photo-Electrochemical water-splitting catalyst. The Zr-MOF/BiVO4 was prepared using a Solvothermal process. X-ray diffraction (XRD) pattern confirmed the formation crystalline Zr-MOF. Fourier Transform Infrared Spectroscopy (FTIR) exhibited the typical functional groups and Raman spectroscopy also confirmed vibrational spectra matching Zr—µ3O and V—O. Furthermore, scanning electron microscopy (SEM) shows distinct Zr-MOF particles and agglomerated Zr-MOF/BiVO4 with uniform size distribution. Tauc plot calculated from UV–Vis diffuse reflectance spectroscopy indicated Zr-MOF and Zr-MOF/BiVO4 to be 3.85 eV and 3.56 eV respectively. When compared to Zr-MOF, incorporating BiVO4 into Zr-MOF increases the photocatalytic response significantly. Owing to improved charge separation and decreased electron–hole recombination, electrochemical studies conducted under simulated sunlight showed a notable improvement in the composite's hydrogen evolution rates. The incorporation of bismuth vanadate (BiVO4) aimed to leverage its suitable band gap and high absorption capacity in the visible light region while also increasing active sites due to defect formation. To study the electrochemical properties of the materials cyclic voltammetry and linear sweep voltammetry were performed. Additionally, Electrochemical Impedance Spectroscopy (EIS) were used to investigate charge transfer mechanisms. It shows very low electron transfer resistance of about 50 Ω for Zr-MOF/BiVO4. The electrochemical studies showed the composite material required very low over potential of 340 mV for oxygen evolution reaction (OER) and 0.3 mV for Hydrogen Evolution Reactions (HER) to achieve current density of 10 mA/cm2.