Unlike other preparation methods of NiCoFe-layered double hydroxides, the present study provides a facile ultrasound method for synthesis of the nano-petal NiCoFe-layered double hydroxide (LDH) prepared under intensification frequency of 40 kHz and ultrasonic power of 305 W. The effect of time reaction on the morphology of NiCoFe-LDH was investigated using the Field Emission-Scanning Electron Microscopy images. The results show that time reaction can affect the morphology and it also showed that the optimal time for synthesis of nano-petal NiCoFe-LDH was 60 min. Then, the effect of nano-petal NiCoFe-LDH on oxygen evaluation reaction activity was studied and compared with NiCoFe-LDH-c nano paricles. Also, in order to study the effect of Co2+ of nano-petal NiCoFe-LDH at water oxidation, the activity of NiFe-LDH synthesized in the same conditions was investigated. The results show that nano-petal NiCoFe-LDH has low onset potential (0.46 V vs. SCE), overpotential (~227 mV) and Tafel slope (234 mV per decade) in comparison with other NiCoFe-LDH nanoparticles (synthesis using co-precipitation method and ultrasonication method within 30 and 120 min), and NiFe-LDH. Based on the obtained results, the nano-petal NiCoFe-LDH can be as a suitable electrocatalyst with good stability for water oxidation reaction in the present 0.1 M KOH media.

中文翻译：

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纳米花瓣形的NiCoFe层状双氢氧化物的超声处理结构：一种出色的水氧化电催化剂。

与其他制备NiCoFe层状双氢氧化物的方法不同，本研究提供了一种简便的超声方法，用于合成在40 kHz增强频率和305 W的超声功率下制备的纳米花瓣NiCoFe层状双氢氧化物（LDH）。使用场发射扫描电子显微镜图像研究了时间反应对NiCoFe-LDH形态的影响。结果表明，时间反应会影响其形貌，并且表明合成纳米花瓣NiCoFe-LDH的最佳时间为60 min。然后，研究了纳米花瓣NiCoFe-LDH对氧评价反应活性的影响，并与NiCoFe-LDH-c纳米颗粒进行了比较。另外，为了研究纳米花瓣NiCoFe-LDH的Co2 +对水氧化的影响，研究了在相同条件下合成的NiFe-LDH的活性。结果表明，与其他NiCoFe-LDH纳米粒子（使用共合成法）相比，纳米花瓣NiCoFe-LDH的起始电势低（0.46 V vs. SCE），超电势（〜227 mV）和Tafel斜率（每十年234 mV）。沉淀法和超声法在30和120分钟内）和NiFe-LDH。基于获得的结果，在当前的0.1M KOH介质中，纳米花瓣NiCoFe-LDH可以作为合适的电催化剂，对水氧化反应具有良好的稳定性。和NiFe-LDH。基于获得的结果，在当前的0.1M KOH介质中，纳米花瓣NiCoFe-LDH可以作为合适的电催化剂，对水氧化反应具有良好的稳定性。和NiFe-LDH。基于获得的结果，在当前的0.1M KOH介质中，纳米花瓣NiCoFe-LDH可以作为合适的电催化剂，对水氧化反应具有良好的稳定性。