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<p>In this study, dual-phase nanocomposites with varied molar ratios were synthesized via a facile hydrothermal approach to engineer multifunctional materials for photocatalytic dye degradation, hydrogen evolution, and electrochemical energy storage. Structural characterization via XRD confirmed the coexistence of wurtzite ZnO and cubic fluorite CeO<sub>2</sub> phases, while FTIR and Raman analyses validated the successful incorporation of CeO<sub>2</sub> into the ZnO matrix with associated lattice distortions and oxygen vacancies. SEM and TEM revealed spherical morphology with agglomerated nanostructures, and EDX confirmed elemental composition without impurities. UV–Vis spectroscopy revealed a systematic bandgap reduction from 3.13&#xa0;eV (Zn100–Ce0) to 2.71&#xa0;eV (Zn50–Ce50), attributed to defect-induced intermediate states and heterojunction formation. Photoluminescence spectra showed decreased emission intensity, indicating suppressed charge recombination. Among all compositions, the equimolar Zn50–Ce50 nanocomposite exhibited the best performance, achieving 98% methylene blue degradation under visible light within 300&#xa0;min, a maximum hydrogen evolution rate of 3150 µmolh<sup>− 1</sup>g<sup>− 1</sup>, and a specific capacitance of 246&#xa0;F/g at 0.5&#xa0;A/g. These outcomes underscore the multifunctionality and tunability of CeO<sub>2</sub> incorporated ZnO nanostructures as promising candidates for integrated environmental and energy applications.</p>

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Hydrothermally Synthesized Dual-Phase Type-II Heterojunction Nanocomposites: Photocatalysis, Hydrogen Evolution, and Super-Capacitive Energy Applications

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Muhammad Faisal Nawaz,
  • Muhammad Ramzan,
  • Asad ur Rehman Khan,
  • Muneerah Alomar,
  • Abdul Quader

摘要

In this study, dual-phase nanocomposites with varied molar ratios were synthesized via a facile hydrothermal approach to engineer multifunctional materials for photocatalytic dye degradation, hydrogen evolution, and electrochemical energy storage. Structural characterization via XRD confirmed the coexistence of wurtzite ZnO and cubic fluorite CeO2 phases, while FTIR and Raman analyses validated the successful incorporation of CeO2 into the ZnO matrix with associated lattice distortions and oxygen vacancies. SEM and TEM revealed spherical morphology with agglomerated nanostructures, and EDX confirmed elemental composition without impurities. UV–Vis spectroscopy revealed a systematic bandgap reduction from 3.13 eV (Zn100–Ce0) to 2.71 eV (Zn50–Ce50), attributed to defect-induced intermediate states and heterojunction formation. Photoluminescence spectra showed decreased emission intensity, indicating suppressed charge recombination. Among all compositions, the equimolar Zn50–Ce50 nanocomposite exhibited the best performance, achieving 98% methylene blue degradation under visible light within 300 min, a maximum hydrogen evolution rate of 3150 µmolh− 1g− 1, and a specific capacitance of 246 F/g at 0.5 A/g. These outcomes underscore the multifunctionality and tunability of CeO2 incorporated ZnO nanostructures as promising candidates for integrated environmental and energy applications.