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<p>Designing efficient electrocatalysts for the hydrogen evolution reaction (HER) is crucial for advancing sustainable energy technologies. In this study, a 2D/2D heterostructure composed of 1T-phase molybdenum disulfide (1T-MoS<sub>2</sub>) and titanium carbide MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x,</sub> denoted as Ti<sub>3</sub>C<sub>2</sub>) is synthesized using a one-step hydrothermal method. The hybrid catalyst exhibits improved HER kinetics, demonstrated by a low overpotential of 248 mV at 10 mA cm<sup>−2</sup> and a Tafel slope of 55 mV dec<sup>−1</sup>, indicating fast reaction kinetics and favorable charge transfer. The addition of tetramethylammonium ions (TMA<sup>+</sup>) induces interlayer expansion, increasing the 1T phase content to 89%. Incorporating only 1% Ti<sub>3</sub>C<sub>2</sub> MXene suppresses oxidation and enhances stability. The composite demonstrates a large electrochemical surface area, high turnover frequency (TOF), and retains over 90% of its catalytic activity after extended electrolysis. This scalable approach offers a promising route to developing stable, efficient 2D electrocatalysts for hydrogen production.</p><p></p>

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2D/2D heterojunction interfaces of 1T-MoS2 and Ti3C2 MXene: designing high-performance catalyst for the hydrogen evolution reaction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月15日

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  • Sana Akir,
  • Bastian Schmiedecke,
  • Debabrata Bagchi,
  • Jan Plutnar,
  • Prashanth W. Menezes,
  • Yael Rodriguez-Ayllon,
  • Yan Lu,
  • Zdenek Sofer,
  • Michelle P. Browne

摘要

Designing efficient electrocatalysts for the hydrogen evolution reaction (HER) is crucial for advancing sustainable energy technologies. In this study, a 2D/2D heterostructure composed of 1T-phase molybdenum disulfide (1T-MoS2) and titanium carbide MXene (Ti3C2Tx, denoted as Ti3C2) is synthesized using a one-step hydrothermal method. The hybrid catalyst exhibits improved HER kinetics, demonstrated by a low overpotential of 248 mV at 10 mA cm−2 and a Tafel slope of 55 mV dec−1, indicating fast reaction kinetics and favorable charge transfer. The addition of tetramethylammonium ions (TMA+) induces interlayer expansion, increasing the 1T phase content to 89%. Incorporating only 1% Ti3C2 MXene suppresses oxidation and enhances stability. The composite demonstrates a large electrochemical surface area, high turnover frequency (TOF), and retains over 90% of its catalytic activity after extended electrolysis. This scalable approach offers a promising route to developing stable, efficient 2D electrocatalysts for hydrogen production.