Scholarlink

<p>The development of efficient and sustainable photocatalysts for hydrogen generation is a key step in addressing the global energy and environmental crises. In this study, spinel ferrite nanoparticles with the general formula MFe<sub>2</sub>O<sub>4</sub> (M = Mn, Ni, Cu) were synthesized via a facile co-precipitation route followed by thermal treatment, and their physicochemical and photocatalytic properties were systematically investigated. Structural analysis by X-ray diffraction confirmed the successful formation of phase-pure spinel ferrites, whereas SEM and EDX revealed distinct morphological features and uniform elemental distributions in the manufactured samples. Raman spectroscopy provided evidence of cation-dependent lattice ordering, and UV–Vis diffuse reflectance measurements showed band gap values of 1.32&#xa0;eV (MnFe<sub>2</sub>O<sub>4</sub>), 1.43&#xa0;eV (CuFe<sub>2</sub>O<sub>4</sub>), and 1.78&#xa0;eV (NiFe<sub>2</sub>O<sub>4</sub>). Photocatalytic H<sub>2</sub> evolution experiments under visible-light irradiation demonstrated that MnFe<sub>2</sub>O<sub>4</sub> exhibited a superior capability, reaching nearly 150&#xa0;μmol of H<sub>2</sub> within 25&#xa0;min, outperforming NiFe<sub>2</sub>O<sub>4</sub> by 1.36 times and CuFe<sub>2</sub>O<sub>4</sub> by 2.14 times. The superior photocatalytic ability of MnFe<sub>2</sub>O<sub>4</sub> can be attributed to its narrower band gap, porous morphology, and enhanced structural order, which synergistically promote visible light absorption, charge segregation, and surface redox reactions. This comparative study highlights the pivotal role of cation substitution in tailoring the electronic and structural properties of spinel ferrites and establishes MnFe<sub>2</sub>O<sub>4</sub> as a highly promising photocatalyst for cost-effective and environmentally friendly hydrogen production.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Photocatalytic H2 generation influenced by cations: a comparative study of MFe2O4 (M = Mn, Ni and Cu)

  • 期刊论文

  • 发表日期：

    2026年3月1日

查看全文
  • Khaled Derkaoui,
  • Ismail Bencherifa,
  • Khadidja Boukhouidem,
  • Amira Djaibet,
  • Hadil Laiche,
  • Amal Elfiad,
  • Yamina Mebdoua,
  • Toufik Hadjersi,
  • Mohamed Kechouane,
  • Mohamed Mehdi Kaci

摘要

The development of efficient and sustainable photocatalysts for hydrogen generation is a key step in addressing the global energy and environmental crises. In this study, spinel ferrite nanoparticles with the general formula MFe2O4 (M = Mn, Ni, Cu) were synthesized via a facile co-precipitation route followed by thermal treatment, and their physicochemical and photocatalytic properties were systematically investigated. Structural analysis by X-ray diffraction confirmed the successful formation of phase-pure spinel ferrites, whereas SEM and EDX revealed distinct morphological features and uniform elemental distributions in the manufactured samples. Raman spectroscopy provided evidence of cation-dependent lattice ordering, and UV–Vis diffuse reflectance measurements showed band gap values of 1.32 eV (MnFe2O4), 1.43 eV (CuFe2O4), and 1.78 eV (NiFe2O4). Photocatalytic H2 evolution experiments under visible-light irradiation demonstrated that MnFe2O4 exhibited a superior capability, reaching nearly 150 μmol of H2 within 25 min, outperforming NiFe2O4 by 1.36 times and CuFe2O4 by 2.14 times. The superior photocatalytic ability of MnFe2O4 can be attributed to its narrower band gap, porous morphology, and enhanced structural order, which synergistically promote visible light absorption, charge segregation, and surface redox reactions. This comparative study highlights the pivotal role of cation substitution in tailoring the electronic and structural properties of spinel ferrites and establishes MnFe2O4 as a highly promising photocatalyst for cost-effective and environmentally friendly hydrogen production.