文献类型：期刊文献

英文题名：Electrochemical properties of nanostructured cobalt hexacyanoferrate containing K+ and Cs+ synthesized in water-in-oil AOT reverse microemulsions

作者：Yang, Chang-Fu[1]; Wang, Qiang[1]; Yi, Chao-Yong[1]; Zhao, Ji-Hua[1]; Fang, Jian[1]; Shen, Wei-Guo[2]

机构：[1] School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China; [2] School of Chemistry and Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2012

卷号：674

起止页码：30

外文期刊名：Journal of Electroanalytical Chemistry

收录：EI(收录号：20122215063602)

语种：英文

外文关键词：Microemulsions - Cyclic voltammetry - Energy dispersive spectroscopy - Solutions - Cobalt - Electrochemical properties - High resolution transmission electron microscopy - Scanning electron microscopy - X ray diffraction - Electrochemical electrodes - Nanostructures - Infrared spectroscopy - Iron - Redox reactions

摘要：Herein a series of cobalt-iron Prussian blue analogs (PBAs) containing K+ and Cs+ were synthesized in water-in-oil AOT reverse microemulsions. The size, morphology and composition of the as-prepared cobalt hexacyanoferrate (CoHCF) can be fine-tuned by conveniently varying the water-to-surfactant molar ratio (w) of the microemulsion, as confirmed by various techniques such as infrared spectroscopy (IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). These nanostructured PBA were thereafter employed to chemically modify electrodes to thoroughly investigate their electrochemical properties. Oxidized and reduced cobalt hexacyanoferrates were fabricated and characterized in the presence of alkali metal (Li +, Na+, K+, Rb+, Cs+) and NH4+ counteractions by cyclic voltammetry (CV). In addition, it was demonstrated that formal potentials of hexacyanoferrate (III, II) redox reactions were sensitive to the choice of electrolyte cations, and they correlated well with the sizes of hydrated Na+, K+, Rb+, Cs+ and NH4+ except for Li+. Furthermore, the samples are found to vary significantly in permeability, probably due to the difference of composition, structure and morphology of products, and the changes during charging/discharging. Finally, it is noteworthy to highlight that the nanostructures of cobalt hexacyanoferrate synthesized at w = 5-40 had much more electrochemistry stability than that synthesized in aqueous solution in all electrolytes. The potential application of the modified electrode of CoHCF films in electrochromic display was also noticed. ? 2012 Elsevier B.V. All rights reserved.