Dynamical Complexity in Electrochemical Oxidations of Thiocyanate

Liu, Li; Feng, Jiu‐Ju; Wu, Guoguang; Lü, Xiaoli; Gao, Qingyu

doi:10.1002/cjoc.200990106

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…The Ag@Cu bimetallic NRDs modified electrode shows an intense anodic peak (c) due to the electrooxidation of SCN -at 0.91 V, whereas no observable anodic peak was noticed in the absence of SCN -(d) or in the presence of SCN -at the Ag seeds modified GCE (b). In the absence of any complex formation, the oxidative peak potential for SCN -would appear to be around 0.9 V [54,55]. This coincides with the present investigation where the electrooxidation of SCN -is achieved without any complex formation.…”

Section: Surface Characterisationsupporting

confidence: 88%

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

2015

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The thiocyanate (SCN -) level in human saliva, serum, and blood has been considered as a biomarker for analyzing the practice of cigarette smokers. Here, we have developed a highly sensitive and selective electrochemical sensor for SCN -in phosphate buffer using an Ag@Cu bimetallic nanorods (NRDs) modified glassy carbon electrode (GCE). The bimetallic Ag@Cu NRDs were grown on the GCE surface by a simple seedmediated growth method. Initially, Ag seeds were deposited on the Nafion coated GCE. The deposited Ag seeds in turn accelerate the growth of bimetallic Ag@Cu NRDs in the presence of cetyltrimethyl ammonium bromide, which acts as a soft template for the onedimensional growth of NRDs. The synthesised NRDs were characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy measurements. The Ag@Cu NRDs modified electrode shows an excellent response towards the electrochemical oxidation of SCN -. Cyclic voltammetry was used to study the linear correlation of SCN -oxidation between 1 and 10 mM, and, subsequently, 10 nM was achieved as the detection limit with a signal to noise ratio (S/N = 3) for Ag@Cu bimetallic NRDs modified GCE. This unique sensor shows a high selectivity towards trace amounts of SCN -in the presence of various interfering cations and anions. It satisfactorily recognized the generated SCN -in a real-time application such as in human saliva. Finally, the fingerprint of SCN -existence in the saliva samples of cigarette smokers and non-smokers were differentiated in a short span of time with ease.

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Section: Surface Characterisationsupporting

confidence: 88%

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

2015

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“…Electrochemical impedance spectroscopy indicated the presence of the hidden negative resistance, suggesting thus the classification of this oscillatory system to the HN-NDR one. Also, the same group of researchers has described the current and potential oscillations, as well as bistability in the electrochemical oxidation of thiocyanate ions on a Pt electrode [143].…”

Section: Oscillatory Oxidation Of Sulfur Compoundsmentioning

confidence: 98%

Temporal Instabilities in Anodic Oxidation of Small Molecules/Ions at Solid Electrodes

Orlik

2012

Monographs in Electrochemistry

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Oscillations and multistability in oxidation processes at solid electrodes are important for several reasons. First, they were reported for species that are (or can appear) important in chemical engineering of fuels, including the fuel cells: hydrogen, carbon monoxide, formaldehyde, formic acid/formate ions, 2-propanol, 1-butanol, hydrazine, or ethylene glycol. It can be useful to know how to avoid instabilities involving these species or, on the contrary, to profit from them. Second, electrooxidation of these molecules exhibits rich variety of nonlinear dynamic behaviors which can be treated in a model way for the sake of generalization. Third, some of these processes, under appropriate conditions, can become a source of spatial or spatiotemporal patterns on electrodes which phenomena only recently gained satisfactory explanation and description. In this chapter, we shall summarize the temporal phenomena associated with the oxidation of the above-mentioned molecules, while pattern formation will be discussed in separate Chap. 2 of volume II.Current research data indicate that such processes should be qualified as electrocatalytic, i.e., the electrode surface is actively engaged in the kinetics of the electron transfer reaction, usually involving the process taking place via the adsorbed intermediate. As in the case of other types of electrochemical oscillators, one can observe the evolution of the understanding of the source of chemical instabilitiesfrom early, sometimes oversimplified explanations oriented exclusively on the properties of the electrode/electrolyte interface toward more recent concepts, involving the analysis of the system's stability in terms of nonlinear dynamics. In particular, oscillations under galvanostatic conditions could be understood only recently in terms of the concept of the HN-NDR oscillator [1] (cf. Chap. 3).The anodic oxidation of H 2 on Pt electrode is an electrocatalytic process, in which the electron transfer is preceded by the adsorption of H 2 molecule on the active surface site. Hence, the oscillatory course of this process can be associated M. Orlik, Self-Organization in Electrochemical Systems I, Monographs in Electrochemistry,

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“…OPD is also a versatile ligand in coordination chemistry. It forms complexes with different metal ions, such as lanthanides (Koroteev et al, 2020), zinc (Gonza ´lez Guillen et al, 2018;Zick & Geiger, 2016), cobalt (Ngopoh et al, 2015;Konieczny et al, 2019), copper (Djebli et al, 2012;Chakraborty et al, 2014), cadmium (Gonza ´lez Guillen et al, 2018) or nickel (Sabbani & Das, 2009;Lu et al, 2009;Willett et al, 2012;Adhikari et al, 2021).…”

Section: Chemical Contextmentioning

confidence: 99%

Synthesis, crystal structure and Hirshfeld surface analysis of diaquabis(o-phenylenediamine-κ² N,N′)nickel(II) naphthalene-1,5-disulfonate

Suyunov,

Turaev,

Alimnazarov

et al. 2023

Acta Cryst E

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The reaction of o-phenylenediamine (OPD), sodium naphthalene1,5-disulfonate (Na2NDS) and nickel sulfate in an ethanol–water mixture yielded the title compound, [Ni(OPD)2(H2O)2]·NDS or [Ni(C6H8N2)2(H2O)2](C10H6O6S2). This salt consists of a complex [Ni(OPD)2(H2O)2]2+ cation with two bidentate OPD ligands and trans aqua ligands, and a non-coordinating NDS2– anion, which is the double-deprotonated form of H2NDS. The NiII atom is situated at a center of inversion and exhibits a slightly tetragonally distorted {O2N4} octahedral coordination environment, with four shorter equatorial Ni—N bonds [2.0775 (17) and 2.0924 (18) Å] and a longer axial Ni—O bond [2.1381 (17) Å]. The OPD ligand is located about an inversion center and is nearly coplanar with the NiN4 plane [dihedral angle 0.95 (9)°]. In the crystal, the cations and anions are connected by charge-assisted intermolecular N—H...O and O—H...O hydrogen-bonding interactions into the tri-periodic network structure. Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H...H (44.1%), O...H/H...O (34.3%), C...H/H...C (14.8%) C...C (6.5%) (involving the cations) and O...H/H...O (50%), H...H (25%), C...H/H...C (15.3%), C...C (8.2%) (involving the anions) interactions.

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Dynamical Complexity in Electrochemical Oxidations of Thiocyanate

Cited by 4 publications

References 24 publications

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

Temporal Instabilities in Anodic Oxidation of Small Molecules/Ions at Solid Electrodes

Synthesis, crystal structure and Hirshfeld surface analysis of diaquabis(o-phenylenediamine-κ² N,N′)nickel(II) naphthalene-1,5-disulfonate

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Dynamical Complexity in Electrochemical Oxidations of Thiocyanate

Cited by 4 publications

References 24 publications

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

Temporal Instabilities in Anodic Oxidation of Small Molecules/Ions at Solid Electrodes

Synthesis, crystal structure and Hirshfeld surface analysis of diaquabis(o-phenylenediamine-κ2 N,N′)nickel(II) naphthalene-1,5-disulfonate

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Product

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Synthesis, crystal structure and Hirshfeld surface analysis of diaquabis(o-phenylenediamine-κ² N,N′)nickel(II) naphthalene-1,5-disulfonate