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Electrochemical Behavior of Inorganic-Organic Hybrid Polyoxometalate ((Cys)3[PW12O40]) nanostructure Self-Assembled Monolayer on Polycrystalline Gold Electrode Surfaces

Abstract

The electrochemistry of polyoxometalates (POMs) is very rich, as many of them can transfer many electrons without their structure being changed. In this study, an inorganic–organic hybrid compound, building from H3[PW12O40] (HPW) and L-cysteine (Cys) has been prepared by solvent free reaction and structurally characterized by routine methods. The results show that HPW preserves its parent structure after functionalization by Cys. Then (Cys)PW was assembled on cleaned polycrystalline gold (poly Au) electrode for the first time. The electrochemical behavior of the poly Au- (Cys)PW SAMs- modified electrode has been investigated in detail by cyclic voltammetry (CV). The experimental results show that the poly Au- (Cys)PW SAMs- modified electrode not only has a higher electrochemical activity than poly Au-HPW SAMs- modified electrode, but also show remarkable stability due to more insolubility of the hybrid POM nanoparticles than parent POM and strong covalent bond poly Au-S, which is important for practical applications. Moreover, surface coverage of the different monolayers was determined from linear sweep voltammetry (LSV) data. Cys and (Cys)PW solutions prepared in 0.1 M HClO4 provided coverages of 1.9± 0.2 ×10-9 and 2.1± 0.2 ×10-9 mol cm-2 on poly Au surface, respectively as evaluated from the reductive desorption peaks. The significance of our research work is to provide a kind of gold surface modified with (Cys)PW nanostructure with the higher electrochemical activity and stability, applied in electrode modification.

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Publication details

The article was received on 10 Nov 2018, accepted on 06 Dec 2018 and first published on 06 Dec 2018


Article type: Paper
DOI: 10.1039/C8NJ05721D
Citation: New J. Chem., 2018, Accepted Manuscript
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    Electrochemical Behavior of Inorganic-Organic Hybrid Polyoxometalate ((Cys)3[PW12O40]) nanostructure Self-Assembled Monolayer on Polycrystalline Gold Electrode Surfaces

    S. Dianat, A. Hatefi-Mehrjardi and K. Mahmoodzadeh, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ05721D

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