A mirage effect analysis of the electrochemical processes in nickel hydroxide electrodes

Rosolen, José Maurício; Decker, F.; Fracastoro‐Decker, M.; Gorenstein, A.; Torresi, Roberto Manuel; Torresi, Susana Inês Córdoba de

doi:10.1016/0022-0728(93)80339-j

Cited by 21 publications

(11 citation statements)

References 15 publications

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“…The fit of voltammetric dada yielded the values D Fe 3þ ¼ 4:7 Â 10 À6 cm 2 s À1 ; D Fe 2þ ¼ 8:9 Â 10 À6 cm 2 s À1 and E o Fe 3þ =Fe 2þ ¼ 0:472 V. The last datum is the standard potential of the redox reaction with regard to that of the reference electrode. Those data are in agreement with our previous results and with those found in the literature [1,8,23,34]. From the fits it was also possible to estimate the electrode area as A = 1.84 cm 2 .…”

Section: Fig 3 Shows Experimental (Circles) and Simulated (Lines) Vosupporting

confidence: 88%

“…The values of on/oC j for each ionic species can be then calculated by fitting the deflection curves in the same way as that described for chronodeflectometric profiles [8]. The variables on/oC j cannot take any value since they are constantly added, according to a given stoichiometric relationship, to rebuild the global on/oC of the respective neutral salt [8,23,34].…”

Section: Application Of the Model To Fit Probe Beam Deflection Datamentioning

confidence: 99%

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Charge neutralization process of mobile species developed during potentiodynamic conditions. Part 2: Simulation and fit of probe beam deflection experiments

Garay

Iglesias

Barbero

2008

Journal of Electroanalytical Chemistry

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Section: Fig 3 Shows Experimental (Circles) and Simulated (Lines) Vosupporting

confidence: 88%

Section: Application Of the Model To Fit Probe Beam Deflection Datamentioning

confidence: 99%

Charge neutralization process of mobile species developed during potentiodynamic conditions. Part 2: Simulation and fit of probe beam deflection experiments

Garay

Iglesias

Barbero

2008

Journal of Electroanalytical Chemistry

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“…Using current pulse deflectometry techniques, the contribution of OH À to the ion exchange of nickel oxide films, 42 was found to be dominant but with a contribution of co-ions (cations). By combination of PBD with EQCM, the role of ions and solvent was demonstrated.…”

Section: Other Oxidesmentioning

confidence: 97%

Ion exchange at the electrode/electrolyte interface studied by probe beam deflection techniques

Barbero

2005

Phys. Chem. Chem. Phys.

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Probe beam deflection (PBD) techniques are a set of in situ electrochemical methods based on the measurement of refractive index gradients in front of the electrode/electrolyte interface. Here, the details of the techniques are described. First, the theory of potential step chronodeflectometry and pulse voltadeflectometry is discussed. Later, different numerical procedures used for data processing and/or simulation of cyclic voltadeflectometry experiments are described. Then, an overview is performed of the techniques use to study electrochemical systems. The systems described are limited to surface species in binary electrolytes, where a clear interpretation of the data is possible. Among the systems studied are: surface reactions on solid electrodes, electrochromic oxides, conducting polymers, redox polymers, double layer charging in nanostructured carbons and ion exchange in layer-by-layer self assembled multilayers. It is shown that PBD techniques have been able to ascertain the effect of different factors on ion exchange: anion size, pH, solvent, film composition, covalent modification, etc. The capability of the techniques to perform fast measurements was also used with success to find out kinetic effects on the ion exchange.

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“…Prior electrochemical quartz crystal microb a lance (EQCM) [20] and probe beam deflection [21] studies of Ni oxide films have indicated that cations and/^r solvent molecules are indeed exchanged during the redox reaction. In related publications [22][23][24], we ha.ve reported the electrochemical behavior and structural properties of pure Ni and 50:50 Ni-Co oxide films formed by the SG technique.…”

Section: + 4ffo + 2ementioning

confidence: 99%

Mass changes accompanying the electrochemical reaction of sol-gel formed 50:50 NiCo oxide films

Serebrennikova

Birss

2000

Journal of Electroanalytical Chemistry

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Mass changes accompanying the electrochemical reaction of sol-gel formed 50:50 Ni-Co oxide films Birss, Viola I.; Serebrennikova, Irina Elsevier Serebrennikova, I. and Birss, V. I. (2000). "Mass changes accompanying the electrochemical reaction of sol-gel formed 50:50 Ni-Co oxide films. AbstractCyclic voltammetry (CV) and the electrochemical quartz crystal microbalance (EQCM) technique have been employed to monitor the mass changes during potential cycling of sol-gel (SG) formed 50:50 Ni-Co oxide films in 0.5 M NaOH solutions. The experimentally determined pH dependence, together with the EQCM measurements, have confirmed that charging and discharging of SG Ni-Co oxide films is accompanied by the injection/expulsion of mobile ions, suggested to be OH ~ and Na + . Although an unambiguous identification of the species involved in the mass transport within the oxide films cannot be made by CV and EQCM alone, these studies provide a deeper insight into morphological changes of the SG oxide films which occur with time of cycling in alkaline solutions. A model involving water exchange during the redox process of these films is proposed, with water being expelled during oxidation and injected upon reduction. An increased amount of exchanged water with longer cycling times may indicate the early stages of the degradation of SG-formed 50:50 Ni-Co oxide films.

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A mirage effect analysis of the electrochemical processes in nickel hydroxide electrodes

Cited by 21 publications

References 15 publications

Charge neutralization process of mobile species developed during potentiodynamic conditions. Part 2: Simulation and fit of probe beam deflection experiments

Charge neutralization process of mobile species developed during potentiodynamic conditions. Part 2: Simulation and fit of probe beam deflection experiments

Ion exchange at the electrode/electrolyte interface studied by probe beam deflection techniques

Mass changes accompanying the electrochemical reaction of sol-gel formed 50:50 NiCo oxide films

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