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<p>Two-dimensional (2D) MBenes are the emerging members of the advanced 2D materials owing to their exceptional functional properties for applications such as energy storage. We report the fabrication of Mo<sub>₄/₃</sub>Y<sub>₂/₃</sub>B<sub>₂−<i>x</i></sub>T<sub><i>z</i></sub> (T<sub><i>z</i> = </sub>-O, -F, or -OH) <i>i-</i>MBene through the wet-chemical etching method using concentrated hydrofluoric (HF) acid. The structural, morphological, optical, and analytical results assured the successful etching of Al atoms and the synthesis of a stable structured <i>i-</i>MBene, and the consequent interlayer opening facilitates fast ion diffusion and enhanced storage capacity. The three-electrode system achieved the maximum gravimetric capacitance of 1112 Fg<sup>−1</sup> with an outstanding energy density of 38 Wh kg<sup>−1</sup> and power density of 250 W kg<sup>-1</sup> at 1 Ag<sup>−1</sup>, which is the highest compared to the other recent 2D materials such as MXenes. Furthermore, the two-electrode system (device) exhibited the gravimetric capacitance of 90 Fg<sup>−1</sup>, energy density of 15 Wh kg<sup>−1</sup>, with a high power density of 800 W kg<sup>−1</sup> at 1 Ag<sup>−1</sup>. Moreover, with 80% capacity retention yield over 5000 cycles at 10 Ag<sup>−1,</sup> <i>i-</i>MBene proved to be a new and notable performance active 2D material for electrochemical energy storage applications.</p>

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Two-dimensional in-plane transition metal boride, Mo1.33Y0.67B2-xTz i-MBene for enhanced energy and power densities in supercapacitor devices

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月23日

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  • Alina Nawaz,
  • Sana Maqbool,
  • Muhammad Yousaf,
  • Syed Irfan,
  • Iftikhar Hussain,
  • Kaili Zhang,
  • Syed Rizwan

摘要

Two-dimensional (2D) MBenes are the emerging members of the advanced 2D materials owing to their exceptional functional properties for applications such as energy storage. We report the fabrication of Mo₄/₃Y₂/₃B₂−xTz (Tz = -O, -F, or -OH) i-MBene through the wet-chemical etching method using concentrated hydrofluoric (HF) acid. The structural, morphological, optical, and analytical results assured the successful etching of Al atoms and the synthesis of a stable structured i-MBene, and the consequent interlayer opening facilitates fast ion diffusion and enhanced storage capacity. The three-electrode system achieved the maximum gravimetric capacitance of 1112 Fg−1 with an outstanding energy density of 38 Wh kg−1 and power density of 250 W kg-1 at 1 Ag−1, which is the highest compared to the other recent 2D materials such as MXenes. Furthermore, the two-electrode system (device) exhibited the gravimetric capacitance of 90 Fg−1, energy density of 15 Wh kg−1, with a high power density of 800 W kg−1 at 1 Ag−1. Moreover, with 80% capacity retention yield over 5000 cycles at 10 Ag−1, i-MBene proved to be a new and notable performance active 2D material for electrochemical energy storage applications.