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<p>The transition to a sustainable and low-carbon energy economy necessitates the development of advanced materials for green hydrogen production. Among the various approaches, photoelectrochemical (PEC) water splitting presents a promising route by directly converting solar energy into chemical fuel. In this context, MgO-Co<sub>3</sub>O<sub>4</sub> nanomaterial emerges as a potential photoanode material, combining the chemical stability of MgO with the electronic tuning afforded by cobalt incorporation. However, the wide band gap of pristine MgO limits its visible light absorption, necessitating band gap engineering through transition metal doping. In this study, MgO-Co3O4 nanomaterials were synthesized via a sonochemical route and systematically characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence (PL). The results highlight a biphasic system comprising MgO and Co3O4, with phase segregation becoming prominent beyond ~ 7.5% Co content. Structural integrity is retained at low doping levels, while nonlinear evolution of microstructural parameters indicates limited Co²⁺ solubility and defect formation. PL data further corroborate this evolution, showing a shift from intrinsic defect-related emission (~ 407 nm) to Co3O4 -associated transitions (~ 493 nm). These findings highlight the interplay between redox states, doping concentration, and synthesis conditions in modulating the optoelectronic properties of MgO-Co3O4. The study provides critical insights into the structural and electronic behavior of MgO-Co3O4, offering a foundation for the rational design of photoanodes with improved efficiency and stability. Subsequently, this work would contribute to the advancement of PEC technology for sustainable hydrogen production and supports ongoing efforts in materials design for renewable energy applications.</p>

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Structural, chemical and optical properties of MgO- Co3O4 nanomaterials for photoelectrochemical water splitting applications

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Imen STEIFI,
  • Mounir SAHLI,
  • Lyes MAIFI,
  • Madiha RASHID,
  • Khaled CHETEHOUNA

摘要

The transition to a sustainable and low-carbon energy economy necessitates the development of advanced materials for green hydrogen production. Among the various approaches, photoelectrochemical (PEC) water splitting presents a promising route by directly converting solar energy into chemical fuel. In this context, MgO-Co3O4 nanomaterial emerges as a potential photoanode material, combining the chemical stability of MgO with the electronic tuning afforded by cobalt incorporation. However, the wide band gap of pristine MgO limits its visible light absorption, necessitating band gap engineering through transition metal doping. In this study, MgO-Co3O4 nanomaterials were synthesized via a sonochemical route and systematically characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence (PL). The results highlight a biphasic system comprising MgO and Co3O4, with phase segregation becoming prominent beyond ~ 7.5% Co content. Structural integrity is retained at low doping levels, while nonlinear evolution of microstructural parameters indicates limited Co²⁺ solubility and defect formation. PL data further corroborate this evolution, showing a shift from intrinsic defect-related emission (~ 407 nm) to Co3O4 -associated transitions (~ 493 nm). These findings highlight the interplay between redox states, doping concentration, and synthesis conditions in modulating the optoelectronic properties of MgO-Co3O4. The study provides critical insights into the structural and electronic behavior of MgO-Co3O4, offering a foundation for the rational design of photoanodes with improved efficiency and stability. Subsequently, this work would contribute to the advancement of PEC technology for sustainable hydrogen production and supports ongoing efforts in materials design for renewable energy applications.