Controllable Synthesis of Fe2O3/Nickel Cobaltite Electrocatalyst to Enhance Oxidation of Small Molecules

Catalysts Pub Date : 2024-05-17 DOI:10.3390/catal14050329

Fowzia S. Alamro, Shymaa S. Medany, Nada S Al-Kadhi, Ayman M. Mostafa, Walaa F. Zaher, Hoda A. Ahmed, Mahmoud A. Hefnawy

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Abstract

Nickel-based catalysts have been widely recognized as highly promising electrocatalysts for oxidation. Herein, we designed a catalyst surface based on iron oxide electrodeposited on NiCo2O4 spinel oxide. Nickel foam was used as a support for the prepared catalysts. The modified surface was characterized by different techniques like electron microscopy and X-ray photon spectroscopy. The activity of the modified surface was investigated through the electrochemical oxidation of different organic molecules such as urea, ethanol, and ethylene glycol. Therefore, the modified Fe@ NiCo2O4/NF current in 1.0 M NaOH and 1.0 M fuel concentrations reached 31.4, 27.1, and 17.8 mA cm−2 for urea, ethanol, and ethylene glycol, respectively. Moreover, a range of kinetic characteristics parameters were computed, such as the diffusion coefficient, Tafel slope, and transfer coefficient. Chronoamperometry was employed to assess the electrode’s resistance to long-term oxidation. Consequently, the electrode’s activity exhibited a reduction ranging from 17% to 30% over a continuous oxidation period of 300 min.

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可控合成 Fe2O3/Nickel Cobaltite 电催化剂以增强小分子的氧化作用

镍基催化剂已被广泛认为是极具潜力的氧化电催化剂。在此，我们设计了一种基于电沉积在镍钴氧化物尖晶石上的氧化铁的催化剂表面。泡沫镍被用作所制备催化剂的载体。通过电子显微镜和 X 射线光子光谱等不同技术对修饰表面进行了表征。通过对尿素、乙醇和乙二醇等不同有机分子的电化学氧化，研究了修饰表面的活性。结果表明，在 1.0 M NaOH 和 1.0 M 燃料浓度下，改性后的 Fe@ NiCo2O4/NF 对尿素、乙醇和乙二醇的氧化电流分别达到 31.4、27.1 和 17.8 mA cm-2。此外，还计算了一系列动力学特性参数，如扩散系数、塔菲尔斜率和传递系数。此外，还采用了时变测量法来评估电极的抗长期氧化能力。结果表明，在 300 分钟的连续氧化过程中，电极的活性降低了 17% 至 30%。

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