2024年3月21日，ACS旗下国际著名期刊《ACS Sustainable Chemistry & Engineering》在线发表了云南师范大学能源与环境科学学院邓书康教授课题组的最新研究成果《Activating Lattice Oxygen in a Nanoporous Crystalline/Amorphous NiFe(II, III)OxHy Heterostructure for Electrocatalytic Water Oxidation with Ampere-Level Activity and Durability》。云南师范大学能源与环境科学学院邓书康教授为通讯作者。昆明理工大学王劲松为共同通讯作者。
Abstract
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 with abundant Fe2+ (c/a NiFe(II, III)OxHy) by partially substituting Ni2+ with Fe2+ is reported. Combination of X-ray absorption spectroscopy, in situ Raman, and density functional theory investigation suggested that the crystalline/amorphous structure with abundant cation defects and oxygen vacancy is conducive to lattice oxygen oxidation mechanism (LOM) and enhances OER kinetics. Fe2+ acts as an electron-sacrificing band to protect Fe3+ from overoxidation and promote the chemical stability. Meanwhile, the nanoporous structure can accelerate the detachment of the O2 and minimize structural oscillations to strengthen the mechanical stability. As a result, the c/a NiFe(II, III)OxHy catalyst not only exhibits superior electrocatalytic activity with an ultralow overpotential of 192 mV at 10 mA/cm2 and a Tafel slope of 41.8 mV/dec but also delivers industrial stability over 200 h at a current density of 1000 mA/cm2. This work provides a simple strategy and fundamental understanding for the development of industrial OER electrocatalysts.
https://pubs.acs.org/doi/10.1021/acssuschemeng.4c00318
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