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<p>In this work, we prepared nickel-incorporated MoS<sub>2</sub> nanoflowers (denoted as Ni-MoS<sub>2</sub>) via a combined hydrothermal and wet chemical reduction approach. The as-prepared catalyst exhibits a three-dimensional hierarchical nanoflower architecture composed of interconnected ultrathin nanosheets, providing abundant exposed active sites and enhanced electrolyte accessibility. Comprehensive structural and spectroscopic analyses, including synchrotron-based X-ray absorption spectroscopy (XAS), confirm successful Ni incorporation and reveal strong interfacial electronic coupling between Ni species and the MoS₂ framework. As-prepared material demonstrates excellent hydrogen and oxygen evolution reaction performances in alkaline medium (1.0 KOH). Of special relevance, Ni-MoS<sub>2</sub> initiates the hydrogen evolution reaction (HER) at a low onset potential of 66 mV and achieves low overpotential (η) of 185 mV (at the cathodic current density of 10 mAcm<sup>-2</sup>) along with low Tafel slope of 145 mVdec<sup>-1</sup>. Moreover, Ni-MoS<sub>2</sub> retains 92% of its original performance in chronoamperometric (CA) stability test up to 13&#xa0;h. More interestingly, the Ni-MoS<sub>2</sub> outperforms the noble metal-based catalysts in the alkaline oxygen evolution reaction (OER) with a remarkably lower overpotential of 285 mV at the anodic current density of 10 mAcm<sup>-2</sup> and Tafel slope of 125 mVdec<sup>-1</sup>. Of utmost importance, Ni-MoS<sub>2</sub> exhibits excellent electrochemical durability after 1000 CV cycles. Importantly, the catalyst achieves overall water splitting at approximately 1.60&#xa0;V in a two-electrode configuration, highlighting its practical bifunctional capability. The improved catalytic performance is attributed to the strong interfacial electronic coupling between Ni and MoS<sub>2</sub>, enhanced electrochemically accessible active surface area, and improved charge-transfer kinetics. Furthermore, the coexistence of conductive 1T and catalytically active 2&#xa0;H phases synergistically facilitates electron transport and electrochemical reaction kinetics. This study highlights the potential of Ni-MoS<sub>2</sub> nanostructures as efficient and durable bifunctional electrocatalysts for alkaline water splitting.</p>

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Nickel-incorporated MoS₂ nanoflowers as efficient bifunctional electrocatalysts for hydrogen and oxygen evolution reactions in alkaline media

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月8日

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  • Sajana Pooniya,
  • V. R. Libin,
  • Ankit Saini,
  • Komal Saini,
  • Gaurav Gotharwal,
  • Krati Bhati,
  • Harshit Jatwa,
  • Dinesh Bhalothia

摘要

In this work, we prepared nickel-incorporated MoS2 nanoflowers (denoted as Ni-MoS2) via a combined hydrothermal and wet chemical reduction approach. The as-prepared catalyst exhibits a three-dimensional hierarchical nanoflower architecture composed of interconnected ultrathin nanosheets, providing abundant exposed active sites and enhanced electrolyte accessibility. Comprehensive structural and spectroscopic analyses, including synchrotron-based X-ray absorption spectroscopy (XAS), confirm successful Ni incorporation and reveal strong interfacial electronic coupling between Ni species and the MoS₂ framework. As-prepared material demonstrates excellent hydrogen and oxygen evolution reaction performances in alkaline medium (1.0 KOH). Of special relevance, Ni-MoS2 initiates the hydrogen evolution reaction (HER) at a low onset potential of 66 mV and achieves low overpotential (η) of 185 mV (at the cathodic current density of 10 mAcm-2) along with low Tafel slope of 145 mVdec-1. Moreover, Ni-MoS2 retains 92% of its original performance in chronoamperometric (CA) stability test up to 13 h. More interestingly, the Ni-MoS2 outperforms the noble metal-based catalysts in the alkaline oxygen evolution reaction (OER) with a remarkably lower overpotential of 285 mV at the anodic current density of 10 mAcm-2 and Tafel slope of 125 mVdec-1. Of utmost importance, Ni-MoS2 exhibits excellent electrochemical durability after 1000 CV cycles. Importantly, the catalyst achieves overall water splitting at approximately 1.60 V in a two-electrode configuration, highlighting its practical bifunctional capability. The improved catalytic performance is attributed to the strong interfacial electronic coupling between Ni and MoS2, enhanced electrochemically accessible active surface area, and improved charge-transfer kinetics. Furthermore, the coexistence of conductive 1T and catalytically active 2 H phases synergistically facilitates electron transport and electrochemical reaction kinetics. This study highlights the potential of Ni-MoS2 nanostructures as efficient and durable bifunctional electrocatalysts for alkaline water splitting.