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Core‐Shell Structured NiCo2O4@FeOOH Nanowire Arrays as Bifunctional Electrocatalysts for Efficient Overall Water Splitting
ChemCatChem ( IF 3.8 ) Pub Date : 2018-08-02 , DOI: 10.1002/cctc.201800606
Man Li 1 , Leiming Tao 1 , Xin Xiao 1 , Xiaowei Lv 1 , Xingxing Jiang 1 , Mingkui Wang 1 , Zhangquan Peng 2 , Yan Shen 1
Affiliation  

Exploring earth‐abundant and high‐performance catalysts for water‐splitting is extremely crucial to produce clean hydrogen fuel. In this work, FeOOH was electrodeposited on NiCo2O4 nanowire to form a three dimensional (3D) core‐shell structure on Ni foam (NiCo2O4@FeOOH/NF) as bifunctional catalyst for overall water splitting. To control the thickness of FeOOH shell layer by optimizing electrodeposition time, the NiCo2O4@FeOOH/NF(500s) with FeOOH layer of ∼7 nm thickness exhibits excellent catalytic activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution. Moreover, in a two‐electrode water splitting system, extremely small potential of 1.52 V can be achieved for NiCo2O4@FeOOH/NF(500s), giving a current density of 10 mA cm−2. Detailed investigation reveals that the thickness of FeOOH layer, strong electronic interaction at the interface between NiCo2O4 and FeOOH play critical role in the excellent catalytic property.

中文翻译:

核壳结构NiCo2O4 @ FeOOH纳米线阵列作为双功能电催化剂,可有效地进行总水分解

为了生产清洁的氢燃料,探索富含泥土和高性能的水分解催化剂是至关重要的。在这项工作中,FeOOH被电沉积在NiCo 2 O 4纳米线上,以在Ni泡沫(NiCo 2 O 4 @ FeOOH / NF)上形成三维(3D)核-壳结构,作为双官能团的总水分解催化剂。为了通过优化电沉积时间来控制FeOOH壳层的厚度,需要使用NiCo 2 O 4FeOOH层厚度约7 nm的@ FeOOH / NF(500s)在碱性溶液中对氢气释放反应(HER)和氧气释放反应(OER)均表现出优异的催化活性和稳定性。此外,在两电极分水系统中,对于NiCo 2 O 4 @ FeOOH / NF(500s),可以实现1.52 V的极小的电势,电流密度为10 mA cm -2。详细的研究表明,FeOOH层的厚度,NiCo 2 O 4与FeOOH之间的界面处的强电子相互作用在优异的催化性能中起着关键作用。
更新日期:2018-08-02
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