Ehsan Muhammad Ali, Khan Abuzar, Suliman Munzir H, Javid Mohamed
Interdisciplinary Research Center for Hydrogen and Energy Storage (IRC-HES) Saudi Arabia
Core Research Facilities, King Fahd University of Petroleum & Minerals Box 5040 Dhahran 31261 Saudi Arabia.
Nanoscale Adv. 2023 Sep 4;5(18):5122-5130. doi: 10.1039/d3na00298e. eCollection 2023 Sep 12.
Bimetallic iron-nickel (FeNi) compounds are widely studied materials for the oxygen evolution reaction (OER) owing to their high electrocatalytic performance and low cost. In this work, we produced thin films of the FeNi alloy on nickel foam (NF) by using an aerosol-assisted chemical deposition (AACVD) method and examined their OER catalytic activity. The hybrid FeNi/Ni catalysts obtained after 1 and 2 h of AACVD deposition show improved charge transfer and kinetics for the OER due to the strong interface between the FeNi alloy and Ni support. The FeNi/Ni-2h catalyst has higher catalytic activity than the FeNi/Ni-1h catalyst because of its nanoflower morphology that provides a large surface area and numerous active sites for the OER. Therefore, the FeNi/Ni-2h catalyst exhibits low overpotentials of 300 and 340 mV at 50 and 500 mA cm respectively, and excellent stability over 100 h, and ∼0% loss after 5000 cycles in 1 M KOH electrolyte. Furthermore, this catalyst has a small Tafel slope, low charge transfer resistance and high current exchange density and thus surpasses the benchmark IrO catalyst. The easy, simple, and scalable AACVD method is an effective way to develop thin film electrocatalysts with high activity and stability.
双金属铁镍（FeNi）化合物因其高电催化性能和低成本而成为广泛研究的析氧反应（OER）材料。在这项工作中，我们采用气溶胶辅助化学沉积（AACVD）方法在泡沫镍（NF）上制备了FeNi合金薄膜，并研究了它们的OER催化活性。在AACVD沉积1小时和2小时后获得的FeNi/Ni混合催化剂由于FeNi合金与Ni载体之间的强界面而显示出改善的电荷转移和OER动力学。FeNi/Ni-2h催化剂比FeNi/Ni-1h催化剂具有更高的催化活性，因为其纳米花形态为OER提供了大表面积和大量活性位点。因此，FeNi/Ni-2h催化剂在50和500 mA cm时分别表现出300和340 mV的低过电位，在1 M KOH电解液中超过100小时具有优异的稳定性，并且在5000次循环后损失约0%。此外，该催化剂具有小的塔菲尔斜率、低的电荷转移电阻和高的电流交换密度，因此超过了基准IrO催化剂。简单、简便且可扩展的AACVD方法是开发具有高活性和稳定性的薄膜电催化剂的有效途径。
