纳米片
析氧
材料科学
氢氧化物
化学工程
催化作用
过电位
钼酸盐
超亲水性
微型多孔材料
电解质
无机化学
电化学
纳米技术
化学
电极
接触角
冶金
复合材料
物理化学
工程类
生物化学
作者
Jonghee Han,Chun Wang,Ziyang Zhang,Yifu Song,Bai-Qi Feng,Ping Na,Zhongli Wang
出处
期刊:Small
[Wiley]
日期:2023-04-28
卷期号:19 (36)
被引量:11
标识
DOI:10.1002/smll.202301609
摘要
Abstract NiFe‐based (oxy)hydroxides are the benchmark catalysts for the oxygen evolution reaction (OER) in alkaline medium, however, it is still challenging to control their structures and compositions. Herein, molybdates (NiFe(MoO 4 ) x ) are applied as unique precursors to synthesize ultrafine Mo modified NiFeO x H y (oxy)hydroxide nanosheet arrays. The electrochemical activation process enables the molybdate ions (MoO 4 2− ) in the precursors gradually dissolve, and at the same time, hydroxide ions (OH − ) in the electrolyte diffuse into the precursor and react with Ni 2+ and Fe 3+ ions in confined space to produce ultrafine NiFeO x H y (oxy)hydroxides nanosheets (<10 nm), which are densely arranged into microporous arrays and maintain the rod‐like morphology of the precursor. Such dense ultrafine nanosheet arrays produce rich edge planes on the surface of NiFeO x H y (oxy)hydroxides to expose more active sites. More importantly, the capillary phenomenon of microporous structures and hydrophilic hydroxyl groups induce the superhydrophilicity and the rough surface produces the superaerophobic characteristic for bubbles. With these advantages, the optimized catalyst exhibits excellent performance for OER, with a small overpotential of 182 mV at 10 mA cm −2 and long‐term stability (200 h) at 200 mA cm −2 . Theoretical calculations show that the modification of Mo enhances the electron delocalization and optimizes the adsorption of intermediates.
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