Kamal W, Allah Abeer Enaiet, Mahmoud Rehab, Farghali Ahmed A, Kotp Amna A, Abdelwahab Abdalla
Department of Chemistry, Faculty of Science, Beni-Suef University 62514 Beni-Suef Egypt
Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Science (PSAS), Beni-Suef University 62511 Beni-Suef Egypt.
RSC Adv. 2024 Oct 17;14(45):32828-32838. doi: 10.1039/d4ra04902k.
The energy crisis is the most urgent issue facing contemporary society and needs to be given top priority. As energy consumption rises, environmental pollution is becoming a serious issue. Direct methanol fuel cells (DMFCs) have emerged as the most promising energy source for a variety of applications such as electric vehicles and portable devices. Unfortunately, the kinetics of methanol oxidation is slow and needs an electrocatalyst to improve the reaction kinetics and the overall fuel cell efficiency. Herein, a straightforward hydrothermal procedure was utilized to prepare copper, nickel, and cobalt-based MOF composites by altering the elemental molar ratios. Cu-MOF (MOFP1), Cu/Ni-MOF (MOFP2), and Cu/Ni/Co-MOF (MOFP3) were prepared after carbonization and characterized using several key techniques such as FTIR, XRD, SEM, and EDX. The SEM analysis reveals that the morphology of MOFP1 is spherical aggregated particles, while that of MOFP2 or MOFP3 is in the form of nanoflakes and nanoflowers. Moreover, upon application of these composites as electrocatalysts for methanol electro-oxidation in an alkaline medium of 1 M NaOH using cyclic voltammetry (CV) and chronoamperometry (CA) tests, the electrochemical performance of MOFP2 in 1 M methanol exhibits the best performance for methanol oxidation with a current density reaching 38.77 mA cm at a scan rate of 60 mV s. This can be attributed to the unique porous open flower structure and the synergistic effect between copper, nickel, and 2-aminoterephthalic acid which develop its catalytic activity.
能源危机是当代社会面临的最紧迫问题，需要给予最高优先级。随着能源消耗的增加，环境污染正成为一个严重问题。直接甲醇燃料电池（DMFC）已成为用于电动车辆和便携式设备等各种应用的最有前景的能源。不幸的是，甲醇氧化的动力学缓慢，需要一种电催化剂来提高反应动力学和整体燃料电池效率。在此，通过改变元素摩尔比，利用一种简单的水热法制备了铜、镍和钴基MOF复合材料。碳化后制备了Cu-MOF（MOFP1）、Cu/Ni-MOF（MOFP2）和Cu/Ni/Co-MOF（MOFP3），并使用FTIR、XRD、SEM和EDX等几种关键技术对其进行了表征。SEM分析表明，MOFP1的形态是球形聚集颗粒，而MOFP2或MOFP3的形态是纳米片和纳米花的形式。此外，使用循环伏安法（CV）和计时电流法（CA）测试，将这些复合材料用作1 M NaOH碱性介质中甲醇电氧化的电催化剂时，MOFP2在1 M甲醇中的电化学性能在扫描速率为60 mV s时表现出对甲醇氧化的最佳性能，电流密度达到38.77 mA cm。这可归因于独特的多孔开放花状结构以及铜、镍和2-氨基对苯二甲酸之间的协同效应，从而提高了其催化活性。
