Anionic clay modified electrodes: electron transfer mediated by electroactive nickel, cobalt or manganese sites in layered double hydroxide films

Qiu, Jiabin; Villemure, Gilles

doi:10.1016/s0022-0728(96)05070-x

Cited by 99 publications

(60 citation statements)

References 31 publications

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“…They were attributed to electron transfer between the adsorbed cations and redox active Co(II) sites in the clays (Xiang and Villemure 1996b). Mediation of the charge transport in films of layered double hydroxides by redox active Ni, Co or Mn sites in the modifiers was also found to result in large increase in the voltametric waves of adsorbed metal cyanide anions (Qiu and Villemure 1995;Qiu and Villemure 1997). The increases observed here can be attributed to a similar mediation of the charge transport in the films by the clays' redox active Cu(II) sites.…”

Section: Electrochemistry Of the Cu-claysmentioning

confidence: 95%

Preparation, Characterization and Electrochemistry of Synthetic Copper Clays

Xiao

1998

Clays and clay miner.

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Abstraet--Hydrothermal treatment of aqueous mixtures of sodium hydroxide, copper chloride and excess sodium silicate (Si/Cu --> 2) at 150 ~ produced blue powders. Scanning electron microscopy/energy dispersive X-ray (SEM/EDX) analysis of the products show they all had similar chemical compositions, with Si/Cu ratios of approximately 1.33, the value expected for 2:1 trioctahedral phyllosilicates. Their Xray diffraction (XRD) patterns were consistent with that of swelling smectite-type clays. Reaction mixtures that did not contain excess Si (Si/Cu -< 1.33) did not produce smectites. They gave gray mixtures of amorphous silicates and copper oxides, with some phyllosilicates. A mixture containing a Si/Cu ratio of 5.2 heated at 250 ~ under 500 psi of Ar gave a pale blue solid containing a Si/Cu ratio of approximately 1, the value expected for chrysocolla. Transmission electron microscopy (TEM) showed this product had a well-ordered layered structure. Its XRD powder pattern was consistent with that of chrysocolla. This clay did not swell very much on exposure to glycol vapors. Peaks were observed in the cyclic voltammogram of electrodes modified with films of these synthetic Cu-clays. They were attributed to electrochemical activity of Cu(II) centers in the lattice of the clays. The presence of these redox active Cu(II) sites greatly improved charge transport in the films. Much larger voltametric waves were observed for [Os(bpy)3] 2 § ions ("bpy" = the ligand 2,2'bipyridyl) adsorbed in fihns of the synthetic Cu-clays than in films of a natural montmorillonite. The larger peak currents obtained corresponded to 10-to 15-fold increases in the fractions of the adsorbed ions that were electrochemically oxidizable in the modified electrodes.

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Section: Electrochemistry Of the Cu-claysmentioning

confidence: 95%

Preparation, Characterization and Electrochemistry of Synthetic Copper Clays

Xiao

1998

Clays and clay miner.

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“…Further research in the understanding of the electron transfer process in the film is needed as the sorbed cations represent only a fraction of the detected compounds. The hydrotalcite-like materials have been finding broader utilization in the field of organic compounds determination due to their electrocatalytic properties improving the charge transport [30,56]. A glassy carbon electrode modified with a thin film of [Ni/Al-Cl] [57,104] was studied for methanol and ethanol oxidation, Ni(II) centres of the hydrotalcite lattice may act as redox mediators according to the following scheme [104]:…”

Section: à5mentioning

confidence: 99%

Clay Modified Electrodes: Present Applications and Prospects

2003

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“…LDHs exhibit specific properties as anion exchangers [2] and have found application in electroanalysis. In particular, LDHs containing a transition metal like Co(II), Ni(II) or Mn(III), which undergoes a reversible redox reaction in the useful potential range, have been proposed as electrode coating materials due to their properties of charge transport [3,4] and of redox catalysts [5], especially in alkaline solution. Electrode surfaces can be easily and rapidly modified with LDHs by one step electrosynthesis [6 -8].…”

Section: Introductionmentioning

confidence: 99%

Anti‐Interferent Properties of Oxidized Nickel Based on Layered Double Hydroxide in Glucose Amperometric Biosensors

et al. 2008

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An amperometric biosensor based on Pt electrodes modified with a thin film of a Ni, Al layered double hydroxide (LDH), submitted to a preliminary oxidative treatment in order to have the nickel centers at the oxidation state þ 4, and glucose oxidase (GOx) is presented. The oxidized LDH acts both as a system to support the enzyme and as a barrier to anions since it acquires an overall negative charge, as demonstrated by electrochemical impedance spectroscopy. Even if the biosensor response is due to the detection of H 2 O 2 at anodic potentials, glucose can be accurately determined in the presence of ascorbic acid or other interferences, commonly present in real matrices in anionic form, since they can not reach the electrode surface. The effectiveness of the developed biosensor has been demonstrated by measuring glucose in samples of fruit juices containing ascorbic acid at high levels.

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Anionic clay modified electrodes: electron transfer mediated by electroactive nickel, cobalt or manganese sites in layered double hydroxide films

Cited by 99 publications

References 31 publications

Preparation, Characterization and Electrochemistry of Synthetic Copper Clays

Preparation, Characterization and Electrochemistry of Synthetic Copper Clays

Clay Modified Electrodes: Present Applications and Prospects

Anti‐Interferent Properties of Oxidized Nickel Based on Layered Double Hydroxide in Glucose Amperometric Biosensors

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