塔菲尔方程
过电位
纳米复合材料
线性扫描伏安法
循环伏安法
介电谱
材料科学
催化作用
电化学
化学工程
析氧
核化学
无机化学
纳米技术
化学
电极
有机化学
物理化学
工程类
作者
Mohammad Ali Rezvani,Hadi Hassani Ardeshiri,Hossein Ghafuri,Nasrin Khalafi
标识
DOI:10.1016/j.apt.2024.104380
摘要
In this research, a new nanocomposite was synthesized via the sol–gel method by encapsulation of tetranuclear sandwich-type hetropolyanion (Na9K[(FeW9O34)2Fe4(H2O)2].32H2O, abbreviated as Fe2W18Fe4, on the surface of MOF-Ni-100 for the first time. The as-prepared nanocomposite (Fe2W18Fe4@MOF-Ni-100) was examined using different microscopy and spectroscopy techniques, including FT-IR, UV–vis, XRD, SEM, EDX, and BET techniques. The assembled Fe2W18Fe4@MOF-Ni-100 nanocomposite served as a potential heterogeneous catalyst in the water oxidation process for the purpose of oxygen evolution reaction (OER) at neutral pH conditions (N2-saturated 0.1 M Na2SO4). The electrochemical characteristics of the Fe2W18Fe4@MOF-Ni-100 nanocomposite was assessed through cyclic voltammetry (CV), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) methods. The desired nanocatalyst displayed a low onset potential of 1.1 V vs. NHE and low overpotential of 269 mV at a current density (j) of 10 mAĊcm−2 with a Tafel slope of 73 mV.dec−1 (pH = 7). Furthermore, the Fe2W18Fe4@MOF-Ni-100 nanocomposite exhibited remarkable stability and retained its catalytic activity even after 200 catalytic cycles.
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