School of Physics and Technology, University of Jinan, 336 West Road of Nan Xinzhuang, Jinan 250022, People's Republic of China.
School of Physics and Technology, University of Jinan, 336 West Road of Nan Xinzhuang, Jinan 250022, People's Republic of China.
J Colloid Interface Sci. 2023 Jun;639:24-32. doi: 10.1016/j.jcis.2023.02.025. Epub 2023 Feb 8.
Obtaining efficient, stable, and low-cost electrocatalysts is the key to realizing large-scale water splitting. In this work, three-dimensional (3D) hierarchical γ-iron oxyhydroxide (γ-FeOOH)/NiS electrocatalyst on Ni foam is constructed for electrochemical overall water splitting. The 3D γ-FeOOH/NiS heterostructure can effectively enhance active sites and charge transfer capability, also the heterostructure can benefit electronic effect at the interfaces and synergistic effect of multiple components. Therefore, the γ-FeOOH/NiS exhibits excellent electrocatalytic activity with low overpotentials of 279 mV at 50 mA⋅cm for oxygen evolution reaction and 92 mV at 10 mA⋅cm for hydrogen evolution reaction, respectively. In addition, only a potential of 1.66 V is needed to attain 10 mA⋅cm for the overall water splitting. In particular, the γ-FeOOH/NiS exhibits long-term stability for 120 h at 10 mA⋅cm without significant degradation. This work provides a valuable idea for obtaining low-cost and high performance bifunctional electrocatalysts for water splitting.
获得高效、稳定且低成本的电催化剂是实现大规模水分解的关键。在这项工作中，构建了三维（3D）分层 γ- 氧化铁（γ-FeOOH）/NiS 电催化剂在泡沫镍上，用于电化学全水分解。3D γ-FeOOH/NiS 异质结构可以有效增强活性位点和电荷转移能力，同时异质结构可以在界面处受益于电子效应和多种组分的协同效应。因此，γ-FeOOH/NiS 表现出优异的电催化活性，析氧反应的过电位低至 279 mV 时达到 50 mA⋅cm-2，析氢反应的过电位低至 92 mV 时达到 10 mA⋅cm-2。此外，仅需 1.66 V 的电势即可达到 10 mA⋅cm-2 的全水分解。特别地，γ-FeOOH/NiS 在 10 mA⋅cm-2 下稳定运行 120 h 而没有明显的降解。这项工作为获得低成本、高性能的双功能水分解电催化剂提供了有价值的思路。
