Electrochemical characteristics of thin films of nickel hexacyanoferrate formed on carbon substrates

Joseph, James; Gomathi, H.; Rao, G. Prabhakara

doi:10.1016/0013-4686(91)85003-p

Cited by 91 publications

(46 citation statements)

References 28 publications

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“…6,12 Among them, nickel hexacyanoferrate (NiHCF) film has a better potential response, which can be further improved by adapting certain preparation procedures and optimizing the film composition. [12][13][14][15] For example, a Ag(I)-stabilized Ni(II)-hexacyanoferrate film can be obtained by adding Ag(I) to the mixture of K3Fe(CN)6 and NiCl2, which gives improved selectivity for potassium. 12 The substrate also affects the formation, structure and property of NiHCF film.…”

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confidence: 99%

Electrochemical Characteristics of Thin Nickel Hexacyanoferrate Films Formed on Gold and Thiol Self-Assembled Monolayers Modified Gold Electrodes

2001

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Nickel hexacyanoferrate (NiHCF) film was prepared and characterized on gold and thiol self-assembled monolayers (SAMs)-modified gold electrodes. It was found that the film exhibited some different electrochemical characteristics compared with that found on a carbon electrode. In the presence of K + , the film exhibited a redox peak at about 0.5 V. The peak potential shifted linearly with the K + concentration over the range of about 0.1 mM -0.1 M with slopes of 54 -60 mV per log[K + ]. However, in solutions containing Na + , Li + or NH4 + ion the film did not generate well-defined peaks, or even a visible redox peak. Therefore, the film showed a selective potential response to K + . The voltammetric behavior of NiHCF film varied with thiols, the preparation procedure and the solution pH. Under certain conditions, the characteristics of the film could be improved to some extent.

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confidence: 99%

Electrochemical Characteristics of Thin Nickel Hexacyanoferrate Films Formed on Gold and Thiol Self-Assembled Monolayers Modified Gold Electrodes

2001

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“…In the present work, we consider the ionically (K + ) and electronically (mixed-valence electron-hopping) conducting polynuclear inorganic material, namely Prussian Blue type nickel hexacyanoferrate [22][23][24][25][26][27] as material for potential application in DSSC as solid redox mediator (charge relay). Redox reactions of metal hexacyanoferrates are fast and reversible, and the systems are characterized by very good chemical and mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characterization of Prussian blue type nickel hexacyanoferrate redox mediator for potential application as charge relay in dye-sensitized solar cells

Rutkowska

Andrearczyk

Żołądek

et al. 2011

J Solid State Electrochem

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A polynuclear electronically/ionically (redox) conducting mixed-valent inorganic material such as nickel (II) hexacyanoferrate(II,III), NiHCF, was considered for potential application as a redox mediator (charge relay) in dye-sensitized solar cell (DSSC). The NiHCF redox reactions were found fast and reversible not only when the system was studied as thin film exposed to an aqueous supporting electrolyte but also as bulk material (pasted powder) in solid state, i.e., in the absence of contact with external liquid electrolyte phase. Usefulness of NiHCF material was diagnosed using conventional electroanalytical approaches, solid-state voltammetric methodology, as well as the dynamic electrochemical impedance spectroscopy technique that permitted monitoring of impedance spectra under potentiodynamic conditions. The material was utilized in a mixed-valent state, i.e., as a mixture of K 4 Ni II [Fe II (CN) 6 ] and K 3 Ni II [Fe III (CN) 6 ] in which iron(II) and iron(III) sites were at the 1:1 ratio. Under such conditions, dynamics of electron-hopping between mixedvalent iron sites was maximized. Our DSSC utilized cisdithiocyanoatobis(4,4′-dicarboxylic acid-2,2′-bipyridine) ruthenium(II) dye (N3) adsorbed onto TiO 2 semiconductor and NiHCF as redox mediator. Although performance of our DSSC was not optimized in terms of the NiHCF film thickness and morphology, as well as lower photocurrents in comparison to those characteristic of the iodine/iodide based DSSC were obtained, our system yielded readily fairly high open-circuit photovoltages on the level of 800 mV. An important issue was that the formal potential of NiHCF was more positive relative to the potential of the iodide/triiodide couple while being still more negative than that equivalent to the ground state of the N3 dye. Thus, NiHCF mediator was able to regenerate the dye.

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“…638 been demonstrated regarding oxidative processes. [7][8][9][10][11][12] A main drawback found when PB modified electrodes are applied for electroanalytical purposes is the poor stability of the film at potentials where Prussian White is cathodically generated. 13 Such negative potentials are required for selective monitoring of hydrogen peroxide in samples containing reducing species.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6] The use of hexacyanometallates containing transition metals has also been investigated to modify electrode surfaces and the electrocatalytic properties of these interfaces have also been demonstrated regarding oxidative processes. [7][8][9][10][11][12] A main drawback found when PB modified electrodes are applied for electroanalytical purposes is the poor stability of the film at potentials where Prussian White is cathodically generated. 13 Such negative potentials are required for selective monitoring of hydrogen peroxide in samples containing reducing species.…”

Section: Introductionmentioning

confidence: 99%

A biosensor based on immobilization of lactate oxidase in a PB-CTAB film for FIA determination of lactate in beer samples

Lowinsohn

Bertotti

2008

J. Braz. Chem. Soc.

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No presente trabalho são apresentados resultados referentes à fabricação de um biossensor para análise de lactato. O dispositivo foi preparado imobilizando-se a enzima lactato oxidase em filme de Azul da Prússia (PB, sigla em inglês) depositado na superfície de eletrodo de carbono vítreo em soluções de CTAB. Nestas condições experimentais observou-se melhoria na sensibilidade e seletividade das determinações de lactato, as quais foram conduzidas em sistema FIA com detecção amperométrica. Nas condições otimizadas (pH = 6,9 e E = −0,1 V), obteve-se curva analítica com limite superior igual a 0,28 mmol L -1 e um limite de detecção de 0,84 µmol L -1 . A repetibilidade do método foi avaliada por meio de injeções consecutivas de amostras de lactato 0,28 mmol L -1 , obtendo-se desvio padrão de 2,2 % (n = 18). O método foi aplicado em amostras de cerveja e houve boa concordância entre os resultados obtidos e aqueles oriundos do uso de procedimento espectrofotométrico de referência.An amperometric lactate biosensor with lactate oxidase immobilized into a Prussian Blue (PB) modified electrode was fabricated. The advantage of using cetyltrimethylammonium bromide (CTAB) in the electrodeposition step of PB films onto glassy carbon surfaces was confirmed taking into account both the stability and sensitivity of the measurements. The biosensor was used in the development of a FIA amperometric method for the determination of lactate. Under optimal operating conditions (pH = 6.9, E = −0.1 V), the linear response of the method was extended up to 0.28 mmol L -1 lactate with a limit of detection of 0.84 µmol L -1 . The repeatability of the method for injections of a 0.28 mmol L -1 lactate solution was 2.2 % (n = 18). The usefulness of the method was demonstrated by determining lactate in beer samples and the results were in good agreement with those obtained by using a reference spectrophotometric enzyme method.Keywords: lactate, biosensor, prussian blue modified electrodes, CTAB, FIA amperometric detection, beer IntroductionThe relevance of metal hexacyanoferrates for electroanalytical chemistry was firstly demonstrated in the pioneering studies of Itaya et al. 1,2 involving the electrocatalysis of oxygen and hydrogen peroxide reduction at surfaces covered by Prussian Blue (PB, iron(III) hexacyanoferrate(II)) films. The transfer of electrons and the movement of small hydrated counter-cations through the channels and holes of the solid for charge compensation is a typical feature of this kind of compound. Owing to the zeolite nature of metal hexacyanoferrates, their ability as effective three-dimensional electrocatalysts has been extensively recognized.Once sufficient negative potentials are applied to PB modified electrodes, electrons are injected into the film and the so-called Prussian-White film is generated which arises from the reduction of a high-spin Fe 3+ . The reduced form (Fe 2+ ) is catalytically active towards the electron-transfer step involving hydrogen peroxide, water being formed as a final product. At positive pot...

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Electrochemical characteristics of thin films of nickel hexacyanoferrate formed on carbon substrates

Cited by 91 publications

References 28 publications

Electrochemical Characteristics of Thin Nickel Hexacyanoferrate Films Formed on Gold and Thiol Self-Assembled Monolayers Modified Gold Electrodes

Electrochemical Characteristics of Thin Nickel Hexacyanoferrate Films Formed on Gold and Thiol Self-Assembled Monolayers Modified Gold Electrodes

Electrochemical characterization of Prussian blue type nickel hexacyanoferrate redox mediator for potential application as charge relay in dye-sensitized solar cells

A biosensor based on immobilization of lactate oxidase in a PB-CTAB film for FIA determination of lactate in beer samples

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