金属有机骨架衍生的 NiFe2O4/Co9S8复合催化剂的合成及其电催化析氧性能

以金属有机骨架(metal-organic frameworks, MOFs)化合物为前驱体, 通过退火、硫化等后续处理方法成功制备了由 NiFe₂O₄ 纳米棒与 Co₉S₈ 空心球组装而成的杂化纳米结构. 该复合催化剂因具有较大的比表面积以及各组分间强力的协同作用, 在电催化析氧反应(oxygen evolution reaction, OER)中表现出了优异的催化活性. 在 1 mol/L KOH 电解质中, 当电流密度达到 10 mA/cm² 时, 仅需 290 mV 的过电位, 且 Tafel 斜率仅为 63.02 mV/dec. 此外, 1 000 次循环伏安(cyclic voltammetry, CV)测试后仍然具有良好的催化活性, 表明该复合催化剂具有优异的稳定性. 研究成果不仅为设计廉价、高效且稳定的析氧催化剂提供了设计思路, 也为其他新型纳米复合材料的合成和应用奠定了基础.

Controlled synthesis of NiFe2O4/Co9S8 nanocomposites derived from metal-organic frameworks as efficient electrocatalysts for oxygen evolution reaction

This paper reported the controlled synthesis of NiFe₂O₄/Co₉S₈ nanocomposites via annealing and sulfuration of metal-organic frameworks (MOFs). Due to the porous structure and the strong synergetic effects between the different composites, the as-prepared NiFe₂O₄/Co₉S₈ nanocomposite catalysts afforded an electrocatalytic oxygen evolution reaction (OER) with a current density of 10 mA/cm2 at a low overpotential of 290 mV and a small Tafel slope of approximately 63.02 mV/dec in 1 mol/L KOH. Moreover, the NiFe₂O₄/Co₉S₈ nanocomposite catalysts showed outstanding stability without obvious decline after 1 000 cycles of sequential cyclic voltammetry (CV) scanning. The findings not only provide a promising strategy for designing efficient and stable OER catalysts but also can be extended to synthesize other novel nanocomposite materials.