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<p>The sluggish kinetics of the oxygen evolution reaction (OER) remain a major barrier to efficient water electrolysis, necessitating the development of robust, earth-abundant electrocatalysts. Herein, we report the electrodeposition of a NiFeCo layered double hydroxide (NiFeCo-LDH) coupled with nickel sulfide (NiS) on mild steel, engineered into a distinctive rod-on-sheet heterostructure. Morphological analysis revealed that pristine NiFeCo-LDH formed nanosheets, while subsequent sulfide deposition generated short NiS rods and nanoparticles uniformly anchored on the layered framework, producing a hierarchical structure with enhanced surface roughness and structural stability. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the coexistence of LDH and NiS phases, with Fe³⁺, mixed Co²⁺/Co³⁺, and Ni²⁺/Ni³⁺ centers synergistically contributing to redox flexibility. Compared with pristine NiFeCo-LDH, the composite exhibited substantially lower potentials (1.31&#xa0;V vs. RHE at 10&#xa0;mA cm⁻² and 1.55&#xa0;V vs. RHE at 100&#xa0;mA cm⁻²), a reduced Tafel slope (48.1 mV dec⁻¹), and a significantly smaller charge-transfer resistance derived from electrochemical impedance spectroscopy (EIS). Temperature-dependent measurements further revealed a markedly decreased apparent activation energy (9.9&#xa0;kJ mol⁻¹), highlighting the intrinsically accelerated kinetics at the LDH–sulfide interface. The optimized heterostructure not only enhances electron transport and electrolyte accessibility but also reinforces mechanical durability under prolonged operation.</p>

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Electrodeposited NiFeCo-LDH@NiS heterostructure with Rod-on-Sheet architecture for highly efficient oxygen evolution reaction

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Waqid Al-Mussawi,
  • Muktha Eti,
  • Tanmoy Prida,
  • S. Radhika,
  • Sanjeev Kumar,
  • Mutabar Latipova,
  • Akmal Abilkasimov,
  • Ruslanbek Siddikov,
  • Mustafa Diab,
  • Aseel Smerat,
  • Mumtaj Shah

摘要

The sluggish kinetics of the oxygen evolution reaction (OER) remain a major barrier to efficient water electrolysis, necessitating the development of robust, earth-abundant electrocatalysts. Herein, we report the electrodeposition of a NiFeCo layered double hydroxide (NiFeCo-LDH) coupled with nickel sulfide (NiS) on mild steel, engineered into a distinctive rod-on-sheet heterostructure. Morphological analysis revealed that pristine NiFeCo-LDH formed nanosheets, while subsequent sulfide deposition generated short NiS rods and nanoparticles uniformly anchored on the layered framework, producing a hierarchical structure with enhanced surface roughness and structural stability. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the coexistence of LDH and NiS phases, with Fe³⁺, mixed Co²⁺/Co³⁺, and Ni²⁺/Ni³⁺ centers synergistically contributing to redox flexibility. Compared with pristine NiFeCo-LDH, the composite exhibited substantially lower potentials (1.31 V vs. RHE at 10 mA cm⁻² and 1.55 V vs. RHE at 100 mA cm⁻²), a reduced Tafel slope (48.1 mV dec⁻¹), and a significantly smaller charge-transfer resistance derived from electrochemical impedance spectroscopy (EIS). Temperature-dependent measurements further revealed a markedly decreased apparent activation energy (9.9 kJ mol⁻¹), highlighting the intrinsically accelerated kinetics at the LDH–sulfide interface. The optimized heterostructure not only enhances electron transport and electrolyte accessibility but also reinforces mechanical durability under prolonged operation.