Inorganic Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran.
Ultrason Sonochem. 2020 Jun;64:104919. doi: 10.1016/j.ultsonch.2019.104919. Epub 2019 Dec 9.
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 Co 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.
与其他 NiCoFe 层状双氢氧化物的制备方法不同，本研究提供了一种简便的超声法，在 40 kHz 的强化频率和 305 W 的超声功率下合成纳米花瓣状 NiCoFe 层状双氢氧化物（LDH）。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，时间反应会影响形态，而且最佳的纳米花瓣状 NiCoFe-LDH 合成时间为 60 分钟。然后，研究了纳米花瓣状 NiCoFe-LDH 对氧评价反应活性的影响，并与 NiCoFe-LDH-c 纳米粒子进行了比较。此外，为了研究纳米花瓣状 NiCoFe-LDH 中 Co 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（使用共沉淀法和超声法在 30 和 120 分钟内合成）和 NiFe-LDH 相比，纳米花瓣状 NiCoFe-LDH 具有较低的起始电位（0.46 V 对 SCE）、过电位（~227 mV）和塔菲尔斜率（234 mV 每 decade）。基于所得到的结果，纳米花瓣状 NiCoFe-LDH 可以作为一种适合的电催化剂，在本研究中具有良好的稳定性，可用于 0.1 M KOH 介质中的水氧化反应。
