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<p>The pursuit of efficient and cost-effective electrocatalysts for the hydrogen evolution reaction (HER) is critical to advancing sustainable hydrogen energy technologies. In this study, we report the fabrication of nanosheet-like samarium oxide–decorated MoS₂ supported on reduced graphene oxide (Sm₂O₃–MoS₂/rGO) nanocomposites via a facile hydrothermal method. Structural and surface characterizations, including X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, confirm the successful integration of Sm₂O₃ nanoparticles with MoS₂ and rGO. The optimized Sm₂O₃–MoS₂/rGO electrocatalyst exhibits remarkable HER activity in 0.5&#xa0;M H₂SO₄, delivering an onset potential of ~ 6.7 mV, a low overpotential of 13.6 mV at 10&#xa0;mA cm⁻², and a Tafel slope of 48.7 mV dec⁻¹. Furthermore, the Sm₂O₃@MoS₂/rGO catalyst demonstrated outstanding stability during 25&#xa0;h of continuous HER operation, showing minimal current loss. Its robust architecture and strong interfacial interaction among Sm₂O₃, MoS₂, and rGO facilitated efficient electron transport and preserved structural integrity, confirming excellent long-term electrocatalytic durability. This work highlights a practical strategy for developing earth-abundant, durable, and high-performance HER electrocatalysts.</p>

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Sm₂O₃-modified MoS₂/rGO nanocomposites: cost-effective and durable electrocatalysts for hydrogen evolution

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • A. Senthilkumar,
  • B. Arivu Selvam,
  • S. Vimala,
  • K. A. Arokiaraj,
  • M. Ramasamy,
  • S. Sevvanthi

摘要

The pursuit of efficient and cost-effective electrocatalysts for the hydrogen evolution reaction (HER) is critical to advancing sustainable hydrogen energy technologies. In this study, we report the fabrication of nanosheet-like samarium oxide–decorated MoS₂ supported on reduced graphene oxide (Sm₂O₃–MoS₂/rGO) nanocomposites via a facile hydrothermal method. Structural and surface characterizations, including X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, confirm the successful integration of Sm₂O₃ nanoparticles with MoS₂ and rGO. The optimized Sm₂O₃–MoS₂/rGO electrocatalyst exhibits remarkable HER activity in 0.5 M H₂SO₄, delivering an onset potential of ~ 6.7 mV, a low overpotential of 13.6 mV at 10 mA cm⁻², and a Tafel slope of 48.7 mV dec⁻¹. Furthermore, the Sm₂O₃@MoS₂/rGO catalyst demonstrated outstanding stability during 25 h of continuous HER operation, showing minimal current loss. Its robust architecture and strong interfacial interaction among Sm₂O₃, MoS₂, and rGO facilitated efficient electron transport and preserved structural integrity, confirming excellent long-term electrocatalytic durability. This work highlights a practical strategy for developing earth-abundant, durable, and high-performance HER electrocatalysts.