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<p>Developing earth-abundant electrocatalysts that combine high intrinsic activity with fast interfacial charge transport is essential for advancing alkaline water electrolysis. Herein, we report the rational design and electrochemical synthesis of NiCo<sub>2</sub>O<sub>4</sub>@MnP heterostructures, which integrate a redox-active spinel oxide with a conductive phosphide, to achieve enhanced oxygen evolution reaction (OER) kinetics. Linear sweep voltammetry revealed that NiCo₂O₄@MnP required only 1.36, 1.47, and 1.58&#xa0;V to deliver 10, 50, and 100&#xa0;mA cm⁻², respectively, surpassing both pristine NiCo₂O₄ and the noble-metal benchmark RuO₂. The Tafel slope was reduced to 37.8 mV dec⁻¹, indicating the most favorable charge-transfer kinetics among the tested electrodes. Temperature-dependent measurements further demonstrated an exceptionally low apparent activation energy (7.11&#xa0;kJ mol⁻¹), confirming the intrinsic thermokinetic advantage of the oxide–phosphide junction. Electrochemical impedance spectroscopy corroborated these findings, with NiCo₂O₄@MnP exhibiting the smallest semicircle, indicative of the most efficient interfacial response. Structural and morphological analyses by XRD, XPS and SEM confirmed the successful formation of a hierarchically porous heterostructure with intimate interfacial contact. Collectively, the results establish that coupling spinel NiCo₂O₄ with MnP produces a synergistic heterostructure that combines electronic conductivity, interfacial polarization, and structural robustness, positioning NiCo₂O₄@MnP as a highly competitive, earth-abundant anode material for alkaline OER.</p>

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Boosting oxygen evolution kinetics through spinel–phosphide coupling in NiCo₂O₄@MnP heterostructures

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Qamar Abuhassan,
  • Ali Ahmadi Peyghan,
  • Maher Ali Rusho,
  • Satish Kumar Samal,
  • Sridharan Sundharam,
  • Sanjeev Kumar,
  • Mutabar Latipova,
  • Akmal Abilkasimov,
  • Ruslanbek Siddikov,
  • Aseel Smerat,
  • Mounir M. Bekhit,
  • Ehab I. Taha

摘要

Developing earth-abundant electrocatalysts that combine high intrinsic activity with fast interfacial charge transport is essential for advancing alkaline water electrolysis. Herein, we report the rational design and electrochemical synthesis of NiCo2O4@MnP heterostructures, which integrate a redox-active spinel oxide with a conductive phosphide, to achieve enhanced oxygen evolution reaction (OER) kinetics. Linear sweep voltammetry revealed that NiCo₂O₄@MnP required only 1.36, 1.47, and 1.58 V to deliver 10, 50, and 100 mA cm⁻², respectively, surpassing both pristine NiCo₂O₄ and the noble-metal benchmark RuO₂. The Tafel slope was reduced to 37.8 mV dec⁻¹, indicating the most favorable charge-transfer kinetics among the tested electrodes. Temperature-dependent measurements further demonstrated an exceptionally low apparent activation energy (7.11 kJ mol⁻¹), confirming the intrinsic thermokinetic advantage of the oxide–phosphide junction. Electrochemical impedance spectroscopy corroborated these findings, with NiCo₂O₄@MnP exhibiting the smallest semicircle, indicative of the most efficient interfacial response. Structural and morphological analyses by XRD, XPS and SEM confirmed the successful formation of a hierarchically porous heterostructure with intimate interfacial contact. Collectively, the results establish that coupling spinel NiCo₂O₄ with MnP produces a synergistic heterostructure that combines electronic conductivity, interfacial polarization, and structural robustness, positioning NiCo₂O₄@MnP as a highly competitive, earth-abundant anode material for alkaline OER.