Ye Qinglan, Li Lingfeng, Li Hangyang, Gu Xiangyang, Han Boming, Xu Xuetang, Wang Fan, Li Bin
School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, P. R. China.
ChemSusChem. 2022 Feb 8;15(3):e202101873. doi: 10.1002/cssc.202101873. Epub 2021 Nov 24.
Designing advanced electrocatalysts for oxygen evolution at large current density (>500 mA cm ) is critical to practical water splitting applications. Herein, a novel quasi-parallel NiFe layered double hydroxide (NiFe LDH) nanosheet arrays with pattern alignment on Ni foam was developed. The initial α-Ni(OH) layer induced effective coprecipitation between Ni and Fe for the formation of LDH phase, guaranteeing the electronic pulling effect among metal cations and enhancing the interaction between active materials and substrate for excellent adhesion and electrical conductivity. Quasi-parallel NiFe LDH nanoarrays exhibited outstanding oxygen evolution activity with a small Tafel slope of 30.1 mV dec and overpotentials of 196, 255, and 284 mV at a current density of 10, 500, and 1000 mA cm in 1.0 m KOH solution, respectively, and high stability over 40 h at 750 mA cm . This work presents a new strategy towards fabricating electrode materials with exceptional performance.
设计用于大电流密度（>500 mA cm ）析氧的先进电催化剂对于实际的水分解应用至关重要。在此，开发了一种在泡沫镍上具有图案排列的新型准平行NiFe层状双氢氧化物（NiFe LDH）纳米片阵列。初始的α-Ni(OH)层诱导了Ni和Fe之间的有效共沉淀以形成LDH相，保证了金属阳离子之间的电子拉引效应，并增强了活性材料与基底之间的相互作用，从而具有优异的附着力和导电性。准平行NiFe LDH纳米阵列表现出出色的析氧活性，在1.0 m KOH溶液中，在电流密度为10、500和1000 mA cm 时，Tafel斜率小至30.1 mV dec ，过电位分别为196、255和284 mV，并且在750 mA cm 下具有超过40 h的高稳定性。这项工作提出了一种制备具有优异性能的电极材料的新策略。
