Alamro Fowzia S, Hefnawy Mahmoud A, Al-Kadhi Nada S, Mostafa Ayman M, Motawea Mariem M, Ahmed Hoda A, Alshomrany Ali S, Medany Shymaa S
Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia.
Chemistry Department, Faculty of Science, Cairo University, 12613-Giza, Egypt.
Heliyon. 2024 Aug 3;10(16):e35791. doi: 10.1016/j.heliyon.2024.e35791. eCollection 2024 Aug 30.
Nickel-iron-based spinel oxide was prepared and supported on multi-walled carbon nanotubes to enhance the electrochemical oxidation of ethylene glycol in an alkaline medium. NiFeO was prepared using facile sol-gel techniques. Then the prepared material was characterized using different bulk and surface techniques like powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmitted electron microscope (TEM). Different electrodes of NiFeO/CNT ratios were prepared to find out the optimum spinel oxide/CNT ratio. The activity of the metal spinel oxides composite was characterized toward ethylene glycol conversion by different electrochemical techniques like cyclic voltammetry (CV), Chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). The modified electrode reached an oxidation current of 43 mA cm in a solution of 1.0 M ethylene glycol and 1.0 M NaOH. Furthermore, some kinetics parameters (like diffusion coefficient, and rate constant) were calculated to evaluate the catalytic performance. Additionally, the electrode showed extreme stability for long-term ethylene glycol oxidation.
制备了镍铁基尖晶石氧化物并负载在多壁碳纳米管上，以增强碱性介质中乙二醇的电化学氧化。采用简便的溶胶-凝胶技术制备了NiFeO。然后使用不同的体相和表面技术对制备的材料进行表征，如粉末X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）。制备了不同NiFeO/CNT比例的电极，以找出最佳的尖晶石氧化物/碳纳米管比例。通过循环伏安法（CV）、计时电流法（CA）和电化学阻抗谱（EIS）等不同的电化学技术，对金属尖晶石氧化物复合材料对乙二醇转化的活性进行了表征。修饰电极在1.0 M乙二醇和1.0 M NaOH溶液中达到了43 mA/cm的氧化电流。此外，计算了一些动力学参数（如扩散系数和速率常数）以评估催化性能。此外，该电极在长期乙二醇氧化过程中表现出极高的稳定性。
