Ahmed Khaja Wahab, Dobson Aidan, Habibpour Saeed, Fowler Michael
Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
Molecules. 2025 Aug 1;30(15):3228. doi: 10.3390/molecules30153228.
Anion exchange membrane (AEM) water electrolysis is a potentially inexpensive and efficient source of hydrogen production as it uses effective low-cost catalysts. The catalytic activity and performance of nickel iron oxide (NiFeO) catalysts for hydrogen production in AEM water electrolyzers were investigated. The NiFeO catalysts were synthesized with various iron content weight percentages, and at the stoichiometric ratio for nickel ferrite (NiFeO). The catalytic activity of NiFeO catalyst was evaluated by linear sweep voltammetry (LSV) and chronoamperometry for the oxygen evolution reaction (OER). NiFeO showed the highest activity for the OER in a three-electrode system, with 320 mA cm at 2 V in 1 M KOH solution. NiFeO displayed strong stability over a 600 h period at 50 mA cm in a three-electrode setup, with a degradation rate of 15 μV/h. In single-cell electrolysis using a X-37 T membrane, at 2.2 V in 1 M KOH, the NiFeO catalyst had the highest activity of 1100 mA cm at 45 °C, which increased with the temperature to 1503 mA cm at 55 °C. The performance of various membranes was examined, and the highest performance of the tested membranes was determined to be that of the Fumatech FAA-3-50 and FAS-50 membranes, implying that membrane performance is strongly correlated with membrane conductivity. The obtained Nyquist plots and equivalent circuit analysis were used to determine cell resistances. It was found that ohmic resistance decreases with an increase in temperature from 45 °C to 55 °C, implying the positive effect of temperature on AEM electrolysis. The FAA-3-50 and FAS-50 membranes were determined to have lower activation and ohmic resistances, indicative of higher conductivity and faster membrane charge transfer. NiFeO in an AEM water electrolyzer displayed strong stability, with a voltage degradation rate of 0.833 mV/h over the 12 h durability test.
阴离子交换膜（AEM）水电解是一种潜在的低成本、高效的制氢方法，因为它使用了有效的低成本催化剂。研究了镍铁氧化物（NiFeO）催化剂在AEM水电解槽中制氢的催化活性和性能。以不同的铁含量重量百分比，并按照铁酸镍（NiFeO）的化学计量比合成了NiFeO催化剂。通过线性扫描伏安法（LSV）和计时电流法对析氧反应（OER）评估了NiFeO催化剂的催化活性。在三电极体系中，NiFeO在1 M KOH溶液中2 V时对OER表现出最高活性，电流密度为320 mA/cm²。在三电极装置中，NiFeO在50 mA/cm²下600 h内表现出很强的稳定性，降解速率为15 μV/h。在使用X - 37 T膜的单电池电解中，在1 M KOH中2.2 V时，NiFeO催化剂在45 °C下活性最高，为1100 mA/cm²，在55 °C时随着温度升高至1503 mA/cm²。研究了各种膜的性能，测试的膜中性能最高的是Fumatech FAA - 3 - 50和FAS - 50膜，这意味着膜性能与膜电导率密切相关。通过获得的奈奎斯特图和等效电路分析来确定电池电阻。发现欧姆电阻随着温度从45 °C升高到55 °C而降低，这意味着温度对AEM电解有积极影响。FAA - 3 - 50和FAS - 50膜的活化电阻和欧姆电阻较低，表明具有更高的电导率和更快的膜电荷转移。AEM水电解槽中的NiFeO表现出很强的稳定性，在12 h耐久性测试中的电压降解速率为0.833 mV/h。
