Babar Pravin, Patil Komal, Karade Vijay, Gour Kuldeep, Lokhande Abhishek, Pawar Sambhaji, Kim Jin Hyeok
KAUST Catalysis Center, Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia.
Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea.
ACS Appl Mater Interfaces. 2021 Nov 10;13(44):52620-52628. doi: 10.1021/acsami.1c14742. Epub 2021 Oct 26.
Ni-Fe-based electrode materials are promising candidates for the oxygen evolution reaction (OER). The synergy between Fe and Ni atoms is crucial in modulating the electronic structure of the active site to enhance electrochemical performance. Herein, a simple chemical immersion technique was used to grow Ni-Fe oxalate nanowires directly on a porous nickel foam substrate. The as-prepared Ni-Fe oxalate electrode exhibited an excellent electrochemical performance of the OER with ultralow overpotentials of 210 and 230 mV to reach 50 and 100 mA cm current densities, respectively, in a 1 M KOH aqueous solution. The excellent OER performance of this Ni-Fe oxalate electrode can be attributed to its bimetallic composition and nanowire structure, which leads to an efficient ionic diffusion, high electronic conductivity, and fast electron transfer. The overall analysis indicates a suitable approach for designing electrocatalysts applicable in energy conversion.
镍铁基电极材料是析氧反应（OER）很有前景的候选材料。铁原子和镍原子之间的协同作用对于调节活性位点的电子结构以增强电化学性能至关重要。在此，采用一种简单的化学浸渍技术直接在多孔泡沫镍基底上生长草酸镍铁纳米线。所制备的草酸镍铁电极在1 M KOH水溶液中表现出优异的析氧反应电化学性能，分别达到50和100 mA cm电流密度时的超电势超低，仅为210和230 mV。这种草酸镍铁电极优异的析氧反应性能可归因于其双金属组成和纳米线结构，这导致了高效的离子扩散、高电子导电性和快速的电子转移。整体分析表明这是一种设计适用于能量转换的电催化剂的合适方法。
