Activating Lattice Oxygen in a Nanoporous Crystalline/Amorphous NiFe(II, III)OxHy Heterostructure for Electrocatalytic Water Oxidation with Ampere-Level Activity and Durability

• DOI: 10.1021/acssuschemeng.4c00318
• Publication Date: 2024-03-21T16:01:21Z
• Authors: Yu Tang; Wen Ge; Lanxian Shen; Peizhi Yang; Shukang Deng; Jinsong Wang
• Keywords: Nanoporous; Overpotential; Oxygen evolution

Developing oxygen evolution reaction (OER) electrocatalysts with ampere-level activity and durability is an open challenge toward the final industrial application. Here, a nanoporous crystalline/amorphous nickel–iron oxyhydroxide heterostructure abundant Fe2+ (c/a NiFe(II, III)OxHy) by partially substituting Ni2+ reported. Combination of X-ray absorption spectroscopy, in situ Raman, density functional theory investigation suggested that structure cation defects vacancy conducive to lattice oxidation mechanism (LOM) enhances OER kinetics. acts as electron-sacrificing band protect Fe3+ from overoxidation promote chemical stability. Meanwhile, can accelerate detachment O2 minimize structural oscillations strengthen mechanical As result, c/a III)OxHy catalyst not only exhibits superior electrocatalytic ultralow overpotential 192 mV at 10 mA/cm2 Tafel slope 41.8 mV/dec but also delivers stability over 200 h current 1000 mA/cm2. This work provides simple strategy fundamental understanding for development electrocatalysts.