Polyvinyl pyrrolidone supported ZnCo₂O₄ and NiCo₂O₄ nanoparticles with 3D nanocactus and nanoflower-like morphology, respectively, directly grown on the surface of nickel foam through a one-step hydrothermal process followed by calcination treatment were used as improved electrocatalyst for oxygen evolution reaction. This study is continuation of our previous objective about the use of polyvinyl pyrrolidone as surface stabilizer and growth modifier during nanoparticles synthesis. The resulting products were analyzed by using X-ray diffraction (XRD), field emission scanning electron micrographs (FE-SEM) equipped with energy dispersive X-ray spectrometer (EDX), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET). The calculated overpotential for ZnCo₂O₄ NPs is as low as 0.282 V while for NiCo₂O₄ NPs is 0.298 V. Additionally, ZnCo₂O₄ NPs had obtained a low Tafel slope of 79.90 mv dec⁻¹ while 92.28 mV dec⁻¹ Tafel slope for NiCo₂O₄ NPs. Lastly, the current density was almost retained during 24 h electrochemical running and obtained 97.74% and 96.18% efficiency, for ZnCo₂O₄ and NiCo₂O₄ NPs respectively.

聚乙烯吡咯烷酮负载的ZnCo ₂ O ₄和NiCo ₂ O ₄直接通过一步水热法然后煅烧处理直接在泡沫镍表面上生长的分别具有3D纳米仙人掌和纳米花状形态的纳米颗粒用作改进的电催化剂，用于氧释放反应。这项研究是我们先前关于在纳米粒子合成过程中使用聚乙烯吡咯烷酮作为表面稳定剂和生长调节剂的目标的延续。通过使用X射线衍射（XRD），配备有能量色散X射线光谱仪（EDX）的场发射扫描电子显微照片（FE-SEM），X射线光电子能谱（XPS）和Brunauer-Emmett分析所得产物-Teller（BET）。ZnCo ₂ O ₄ NPs的计算过电势低至0.282 V，而NiCo ₂ø ₄的NP是0.298 V.此外，碳酸锌₂ ö _4周的NP已取得79.90 MV分解的低塔菲尔斜率^-1而92.28毫伏癸^-1塔菲尔斜率为镍钴₂ ö _4周的NP。最后，在ZnO ₂ O ₄和NiCo ₂ O ₄ NPs电化学运行24 h时，电流密度几乎保持不变，效率分别为97.74％和96.18％。