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摘要: NiFe羟基氧化物及其氢氧化物是一种有效的、含量丰富的且廉价的析氧反应催化剂。然而，这类催化剂有着不可避免的缺陷—易脱落，严重影响了它的长期稳定性，因而阻碍了其工业应用；同时，导电性不高导致了其在析氧反应时较高的过电位。本文采用共电沉积法和模板去除法，利用聚氨酯海绵作为模板，电沉积了不同Fe含量的NiFe合金泡沫用于催化析氧反应，并通过扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)分别表征了NiFe合金泡沫的物理性质，表明催化剂中Ni和Fe元素的存在及其分布均匀，形成了多孔NiFe合金。通过循环伏安法(CV)、线性扫描伏安法(LSV)、电化学阻抗谱法(EIS)、I-t等测试了其OER性能。含铁量为30%的NiFe合金泡沫在过电位为292 mV即可产生10 mA/cm2的电流密度，Tafel斜率为126.12 mV/decade，且具有良好的长期稳定性。由于没有任何复杂的电极制备方法和黏合剂，本文所研究的NiFe合金泡沫非常适用于作为工业碱性介质中电解水的阳极材料。Abstract: NiFe oxyhydroxide and hydroxide have been proven to be efficient and earth-abundant non-noble metal catalysts for the oxygen evolution reaction (OER). However, the fragile nature of these oxyhydroxides or hydroxides severely reduces the long-term stability and hinders the industrial applications. Meanwhile, the poor electrical conductivity of these materials also has seriously led to the higher overpotential when applying to the OER. Herein, a novel method using polyurethane (PU) sponge as electroplating was carried out to design NiFe alloy foam with different Fe content for OER. The physical properties of NiFe alloy foams were characterized by Scanning Electronic Microscopy (SEM), Energy Dispersive System (EDS) and X-Ray Diffraction (XRD), respectively, suggesting that the porous NiFe alloy is formed with uniform distribution of Ni and Fe. The OER performance was tested by Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), Electrochemical Impedance Spectroscopy (EIS), I-t, etc. The results showed that the doped Fe could significantly improve the conductivity and OER performance of Ni foam. The NiFe alloy foam with 30% Fe exhibited 292 mV overpotential at 10 mA/cm2 and the Tafel slope 126.12 mV/decade in alkaline solution with excellent long-term stability. Without any complex electrode preparation processes and binders, NiFe alloy foam is much convenient to use as anode of water splitting in alkaline media for industrial applications.
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Key words:
- OER /
- NiFe alloy foam /
- porous structure /
- water splitting
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Figure 3 Scanning electron microscopy (SEM) micrograph for pure Ni and NiFe alloy foam with different Fe content (20%, 30%, 50%, 75%, 100%) at different magnification (2 μm and 20 μm)
Figure 4 SEM((a)−(c)), mapping (d) and EDS((e)−(g)) for NiFe alloy foam with 30% Fe content
Figure 6 LSV curves ((a), (c)) and their Tafel curves ((b), (d)) of NiFe alloy foam with varied Fe content and pure Ni
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