采用共沉淀法制备尖晶石型NiFe2O4粉体,然后将其加入瓦特镀镍液中,采用复合电沉积制备Ni/NiFe2O4复合电极.通过改变镀液的pH值、阴极电流密度jk等条件,探索最佳工艺条件.运用扫描电子显微镜(SEM)、能谱分析(EDS)和X射线衍射仪(XRD)表征粉体以及复合电极的组成和结构.结果表明,在镀液pH值为5.8～6.0、jk为40×10-3 ～60×10-3 A/cm2条件下,所得复合电极中NiFe2O4的质量分数最高可达55.15％.采用循环伏安、稳态极化以及恒电势阶跃,研究了电极在5 mol/L KOH溶液中的电催化析氧性能.与Ni电极对比,Ni/NiFe2O4复合电极的电催化析氧性能更好,比表面积是镍电极的23.02倍,表观活化能降低了62.07 kJ/mol.恒电势长时间电解析氧实验表明,Ni/NiFe2 O4复合电极在碱性介质中具有较高的析氧稳定性.
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