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<p>This study presents the synthesis and electrochemical evaluation of a MIL-101(Cr)/V₂CTₓ@MgH₂ ternary heterostructure for hybrid energy-storage applications. The composite was designed by integrating porous MIL-101(Cr), conductive V₂CTₓ MXene, and redox-active MgH₂ to combine ion-accessible porosity, rapid electron transport, and faradaic charge-storage contribution within one electrode architecture. In a three-electrode configuration, the MIL-101(Cr)/V₂CTₓ@MgH₂ electrode delivered a specific charge capacity of 1290&#xa0;C g⁻¹, exceeding the performance of the individual components. An asymmetric MIL-101(Cr)/V₂CTₓ@MgH₂//AC supercapattery device was further assembled using the ternary composite and activated carbon. The device achieved a specific charge capacity of 440&#xa0;C g⁻¹ and delivered an energy density of ~ 86.4 Wh kg⁻¹ at a power density of 1600&#xa0;W kg⁻¹, while retaining 83.6% of its capacity with 90.7% coulombic efficiency after 12,000 cycles. The improved performance is attributed to the synergistic interaction among the electrolyte-accessible MIL-101(Cr) framework, conductive V₂CTₓ pathways, and MgH₂-assisted faradaic activity. Kinetic analysis indicates a hybrid charge-storage mechanism involving both surface-controlled capacitive behavior and diffusion-controlled redox processes.</p>

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Enhanced electrochemical performance of MIL-101(Cr)/V₂CTₓ@MgH₂ MOF–MXene–hydride ternary heterostructure

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Ishfaq Ahmad,
  • Tausif Zahid,
  • Rizwan Ahmed Malik,
  • Hussein Alrobei

摘要

This study presents the synthesis and electrochemical evaluation of a MIL-101(Cr)/V₂CTₓ@MgH₂ ternary heterostructure for hybrid energy-storage applications. The composite was designed by integrating porous MIL-101(Cr), conductive V₂CTₓ MXene, and redox-active MgH₂ to combine ion-accessible porosity, rapid electron transport, and faradaic charge-storage contribution within one electrode architecture. In a three-electrode configuration, the MIL-101(Cr)/V₂CTₓ@MgH₂ electrode delivered a specific charge capacity of 1290 C g⁻¹, exceeding the performance of the individual components. An asymmetric MIL-101(Cr)/V₂CTₓ@MgH₂//AC supercapattery device was further assembled using the ternary composite and activated carbon. The device achieved a specific charge capacity of 440 C g⁻¹ and delivered an energy density of ~ 86.4 Wh kg⁻¹ at a power density of 1600 W kg⁻¹, while retaining 83.6% of its capacity with 90.7% coulombic efficiency after 12,000 cycles. The improved performance is attributed to the synergistic interaction among the electrolyte-accessible MIL-101(Cr) framework, conductive V₂CTₓ pathways, and MgH₂-assisted faradaic activity. Kinetic analysis indicates a hybrid charge-storage mechanism involving both surface-controlled capacitive behavior and diffusion-controlled redox processes.