Determination of the Flat Band Potential of Nanoparticles in Porous Electrodes by Blocking the Substrate–Electrolyte Contact
Determination of the Flat Band Potential of Nanoparticles in Porous Electrodes by Blocking the Substrate–Electrolyte Contact
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DOI：
10.1021/acs.jpcc.7b11423
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发表时间：
2018-01
影响因子：
3.7
通讯作者：
H. Naatz;R. Hoffmann;A. Hartwig;F. Mantia;S. Pokhrel;L. Mädler
中科院分区：
文献类型：
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作者：
H. Naatz;R. Hoffmann;A. Hartwig;F. Mantia;S. Pokhrel;L. Mädler
金属氧化物纳米颗粒的平带电位的测定对于了解它们在水性环境中的电化学行为至关重要。电化学行为决定了纳米材料的可能应用并控制其对环境的影响。因此，证明了一种新的电极制造方法，可以通过电化学阻抗谱确定多孔纳米粒子电极中纳米粒子的平带电势。在此类电极中，电解质与基底材料接触并对整个电极的交流响应做出显着贡献。为了阻止基材与电解质的接触，将纳米颗粒层吸收到液体二丙烯酸酯单体中，然后进行聚合。为了重新建立最外层聚合物覆盖的颗粒和电解质之间的接触，进行了O2等离子体处理。基于这种新的电极制造程序，TiO2、WO3 和 Co3O4 纳米颗粒的平带电势...
The determination of the flat band potential of metal oxide nanoparticles is essential to understand their electrochemical behavior in aqueous environments. The electrochemical behavior determines the possible applications and governs the environmental impact of a nanomaterial. Hence, a new electrode fabrication method is demonstrated that allows determining the flat band potential of nanoparticles in porous nanoparticle electrodes via electrochemical impedance spectroscopy. In such electrodes, the electrolyte is in contact with the substrate material and contributes significantly to the ac response of the entire electrode. To block the substrate–electrolyte contact, the nanoparticle layers were imbibed in a liquid diacrylate monomer, followed by polymerization. To reestablish the contact between the outermost polymer-covered particles and the electrolyte, an O2 plasma treatment was conducted. Based on this new electrode fabrication procedure, the flat band potential of TiO2, WO3, and Co3O4 nanoparticles ...