通过低温共沉淀技术合成了多孔CoFe层状双金属氢氧化物（CoFe LDH）纳米片。运用X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电镜（SEM）、透射电镜（TEM）等手段对产物的物相、组成及微观形貌进行了表征,并探讨了铁离子（Fe³⁺）含量对CoFe LDH纳米结构生长行为的影响,考察了制备的产物作为电催化剂在电解水析氧反应中的性能。结果表明,Fe³⁺的加入可以有效调节产物的形貌、结晶度和孔道结构。在合适的Co与Fe比例条件下,制备的CoFe LDH可形成多孔纳米片,且增大了总孔体积,增加了表面活性位点。同时,结晶CoFe LDH纳米片可促进Co和Fe离子间的电荷转移行为,从而提高产物的电催化活性。对于电解水析氧反应,当电流密度为10 mA/cm²时,结晶Co_0.67Fe_0.33 LDH多孔纳米片所需的过电势仅为291 mV,Tafel斜率为33 mV/dec,并展现出良好的循环稳定性。

Porous CoFe layered double hydroxide（CoFe LDH） nanosheets electrocatalyst was prepared by low-temperature co-precipitation method.The phase,composition and microstructure of the products were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,scanning electron microscopy（SEM） and transmission electron microscopy （TEM）.The effect of Fe³⁺ content on the growth behavior of CoFe LDH nanostructures and the electrocatalytic activity on oxy-gen evolution of electrolytic water reaction were discussed.The results showed that the morphology,crystallinity and pore structure of the product can be facilely tuned by the addition of Fe³⁺.Porous CoFe LDH nanosheets with large the total pore volume and enriched active sites were achieved under a suitable Co/Fe ratio.Meanwhile,CoFe LDH resulted in the improvement of the conductivity and the acceleration of charge exchange between Fe and Co active centers,thereby enhancing catalytic activity.For oxygen evolution of electrolytic water reaction,the obtained crystalline Co_0.67Fe_0.33 LDH nanosheets reached a current density of 10 mA/cm² with an overpotential of a 291 mV and a tafel slope of 33 mV/dec,and showed good cycle stability.