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<p>A ternary MIL-53/V<sub>2</sub>CT<sub>x</sub>@NiFe<sub>2</sub>O<sub>4</sub> heterostructure was developed as a bifunctional electrode material for remarkable supercapattery energy storage and alkaline hydrogen evolution reaction (HER). The material design integrates the porous ion-accessible framework of MIL-53, the conductive layered network of V<sub>2</sub>CT<sub>x</sub> MXene, and the redox/catalytic activity of spinel NiFe<sub>2</sub>O<sub>4</sub>. This synergistic architecture improves electrolyte penetration, accelerates electron transport, exposes abundant Ni/Fe redox-active sites, and enhances interfacial charge-transfer kinetics. Structural and physicochemical analysis confirmed the effective formation of the MIL-53/V<sub>2</sub>CT<sub>x</sub>@NiFe<sub>2</sub>O<sub>4</sub> heterostructure; BET and EIS results revealed an increased specific surface area of 99.68&#xa0;m<sup>2</sup>&#xa0;g⁻<sup>1</sup> and reduced charge-transfer resistance of 58&#xa0;Ω. In the three-electrode configuration, the MIL-53/V<sub>2</sub>CT<sub>x</sub>@NiFe<sub>2</sub>O<sub>4</sub> shows a CV-derived specific capacity (<i>Q</i><sub>s</sub>) of 960&#xa0;C&#xa0;g⁻<sup>1</sup> at 10&#xa0;mV&#xa0;s⁻<sup>1</sup> and a GCD-derived <i>Q</i><sub>s</sub> of 1210&#xa0;C&#xa0;g⁻<sup>1</sup> at 2&#xa0;A&#xa0;g⁻<sup>1</sup>, confirming its enhanced Faradaic charge-storage capability. Assembled MIL-53/V<sub>2</sub>CT<sub>x</sub>@NiFe<sub>2</sub>O<sub>4</sub>//AC asymmetric supercapattery achieved an energy and power density of 87.4&#xa0;Wh&#xa0;kg⁻<sup>1</sup>, 1700&#xa0;W&#xa0;kg⁻<sup>1</sup>, and retained 83.6% of its capacity after 12000 cycles with 93.4% coulombic efficiency. Dunn’s kinetic analysis further confirmed the coexistence of diffusion-controlled battery-type and surface-controlled capacitive contributions. For alkaline HER, the composite exhibited improved catalytic activity with an overpotential of 174.8&#xa0;mV and a Tafel slope of 76.4&#xa0;mV&#xa0;dec⁻<sup>1</sup>, attributed to MXene-assisted conductivity, improved interfacial electron transfer, and accessible Ni/Fe catalytic sites. These results demonstrate that MIL-53/V<sub>2</sub>CT<sub>x</sub>@NiFe<sub>2</sub>O<sub>4</sub> is a promising bifunctional heterostructure for advanced hydrogen generation and electrolytic energy-storage applications.</p> Graphical Abstract <p></p>

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Synergistic MIL-53/V2CTx MXene@NiFe2O4 heterostructure for advanced energy storage and hydrogen evolution applications

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Muhammad Ashraf,
  • Sohail Mumtaz,
  • Lamia Abu El Maati,
  • Mohammed T. Alotaibi,
  • Sahar G. Tawfik,
  • Sadridin Eshkaraev

摘要

A ternary MIL-53/V2CTx@NiFe2O4 heterostructure was developed as a bifunctional electrode material for remarkable supercapattery energy storage and alkaline hydrogen evolution reaction (HER). The material design integrates the porous ion-accessible framework of MIL-53, the conductive layered network of V2CTx MXene, and the redox/catalytic activity of spinel NiFe2O4. This synergistic architecture improves electrolyte penetration, accelerates electron transport, exposes abundant Ni/Fe redox-active sites, and enhances interfacial charge-transfer kinetics. Structural and physicochemical analysis confirmed the effective formation of the MIL-53/V2CTx@NiFe2O4 heterostructure; BET and EIS results revealed an increased specific surface area of 99.68 m2 g⁻1 and reduced charge-transfer resistance of 58 Ω. In the three-electrode configuration, the MIL-53/V2CTx@NiFe2O4 shows a CV-derived specific capacity (Qs) of 960 C g⁻1 at 10 mV s⁻1 and a GCD-derived Qs of 1210 C g⁻1 at 2 A g⁻1, confirming its enhanced Faradaic charge-storage capability. Assembled MIL-53/V2CTx@NiFe2O4//AC asymmetric supercapattery achieved an energy and power density of 87.4 Wh kg⁻1, 1700 W kg⁻1, and retained 83.6% of its capacity after 12000 cycles with 93.4% coulombic efficiency. Dunn’s kinetic analysis further confirmed the coexistence of diffusion-controlled battery-type and surface-controlled capacitive contributions. For alkaline HER, the composite exhibited improved catalytic activity with an overpotential of 174.8 mV and a Tafel slope of 76.4 mV dec⁻1, attributed to MXene-assisted conductivity, improved interfacial electron transfer, and accessible Ni/Fe catalytic sites. These results demonstrate that MIL-53/V2CTx@NiFe2O4 is a promising bifunctional heterostructure for advanced hydrogen generation and electrolytic energy-storage applications.

Graphical Abstract