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<p>Designing multifunctional heterogeneous junctions offers an effective route to boost the dual catalytic performance of nanomaterials, as the cooperative interactions at multiple interfaces can markedly enhance their inherent electrochemical characteristics. In the present work, a bilayer, sandwich-structured MoS<sub>2</sub>/NiSe<sub>2</sub>/reduced graphene oxide (rGO) composite possessing a well-organized multi-interface framework was fabricated through a facile hydrothermal approach. The resulting hybrid exhibits a porous nanosheet configuration with a Brunauer–Emmett–Teller (BET) surface area of 127.2 m<sup>2</sup>&#xa0;g⁻<sup>1</sup> and an average pore diameter of 5.3&#xa0;nm, both notably superior to those of pure NiSe<sub>2</sub> (78.1 m<sup>2</sup>&#xa0;g⁻<sup>1</sup>, 4.1&#xa0;nm). The optimized MoS<sub>2</sub>@NiSe<sub>2</sub>/rGO catalyst displays remarkable oxygen evolution reaction (OER) activity in 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub>, requiring exceptionally low overpotentials of 180, 222, 252, and 281&#xa0;mV at current densities of 10, 25, 50, and 100&#xa0;mA&#xa0;cm⁻<sup>2</sup>, respectively. A Tafel slope of 66&#xa0;mV dec⁻<sup>1</sup> highlights its accelerated reaction kinetics relative to MoS<sub>2</sub> (132&#xa0;mV dec⁻<sup>1</sup>) and NiSe<sub>2</sub> (97&#xa0;mV dec⁻<sup>1</sup>). Notably, MoS<sub>2</sub>/NiSe<sub>2</sub>@rGO with the highest Cdl (12.25 mF cm<sup>−2</sup>) has the largest ECSA (153.1 cm<sup>2</sup>) compared to other samples MoS<sub>2</sub> (51.4 cm<sup>2</sup>) and NiSe<sub>2</sub> (81.5 cm<sup>2</sup>), respectively. The MoS<sub>2</sub>@NiSe<sub>2</sub>/rGO catalyst displayed excellent long-term stability during acidic OER, maintaining a steady potential at 10&#xa0;mA·cm⁻<sup>2</sup> for 500&#xa0;h, demonstrating superior durability and structural robustness. When compared with previously reported MoS<sub>2</sub>-based heterostructures, the MoS<sub>2</sub>@NiSe<sub>2</sub>/rGO catalyst ranks among the most efficient acidic OER materials, delivering one of the smallest overpotentials (180&#xa0;mV at 10&#xa0;mA&#xa0;cm⁻<sup>2</sup>) and exceptional operational stability. The outstanding catalytic behavior is attributed to the synergistic coupling between MoS<sub>2</sub> and NiSe<sub>2</sub>, effectively reinforced by the conductive rGO matrix, establishing this hybrid as a highly promising candidate for next-generation acidic OER electrocatalysts.</p>

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Multi-interface MoS2@NiSe2/rGO hybrid catalyst with exceptional kinetics and long-term stability for oxygen evolution in water splitting

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • K. L. Palanisamy,
  • V. Devabharathi,
  • D. Madhan,
  • M. Sangeetha

摘要

Designing multifunctional heterogeneous junctions offers an effective route to boost the dual catalytic performance of nanomaterials, as the cooperative interactions at multiple interfaces can markedly enhance their inherent electrochemical characteristics. In the present work, a bilayer, sandwich-structured MoS2/NiSe2/reduced graphene oxide (rGO) composite possessing a well-organized multi-interface framework was fabricated through a facile hydrothermal approach. The resulting hybrid exhibits a porous nanosheet configuration with a Brunauer–Emmett–Teller (BET) surface area of 127.2 m2 g⁻1 and an average pore diameter of 5.3 nm, both notably superior to those of pure NiSe2 (78.1 m2 g⁻1, 4.1 nm). The optimized MoS2@NiSe2/rGO catalyst displays remarkable oxygen evolution reaction (OER) activity in 0.5 M H2SO4, requiring exceptionally low overpotentials of 180, 222, 252, and 281 mV at current densities of 10, 25, 50, and 100 mA cm⁻2, respectively. A Tafel slope of 66 mV dec⁻1 highlights its accelerated reaction kinetics relative to MoS2 (132 mV dec⁻1) and NiSe2 (97 mV dec⁻1). Notably, MoS2/NiSe2@rGO with the highest Cdl (12.25 mF cm−2) has the largest ECSA (153.1 cm2) compared to other samples MoS2 (51.4 cm2) and NiSe2 (81.5 cm2), respectively. The MoS2@NiSe2/rGO catalyst displayed excellent long-term stability during acidic OER, maintaining a steady potential at 10 mA·cm⁻2 for 500 h, demonstrating superior durability and structural robustness. When compared with previously reported MoS2-based heterostructures, the MoS2@NiSe2/rGO catalyst ranks among the most efficient acidic OER materials, delivering one of the smallest overpotentials (180 mV at 10 mA cm⁻2) and exceptional operational stability. The outstanding catalytic behavior is attributed to the synergistic coupling between MoS2 and NiSe2, effectively reinforced by the conductive rGO matrix, establishing this hybrid as a highly promising candidate for next-generation acidic OER electrocatalysts.