ELECTROCHEMISTRY OF THE NICKEL OXIDE ELECTRODE: PART III. ANODIC POLARIZATION AND SELF-DISCHARGE BEHAVIOR

1962 ◽  
Vol 40 (8) ◽  
pp. 1690-1707 ◽  
Author(s):  
B. E. Conway ◽  
P. L. Bourgault
Keyword(s):  
Nickel Oxide ◽  
Oxygen Evolution ◽  
Anodic Polarization ◽  
Isotope Effects ◽  
Open Circuit ◽  
Oxide Electrode ◽  
Tafel Slopes ◽  
Nickel Oxide Electrode ◽  
Discharge Behavior ◽  
Inverse Isotope Effect

Further evidence that the rate-controlling process in self-discharge of the nickel oxide electrode is the anodic partial reaction of oxygen evolution is reported and is based on: (a) comparison of the heats of activation for open-circuit oxygen evolution and for d-c. anodic polarization with oxygen evolution; (b) comparison of the current potential behavior for d-c. anodic polarization and for rates of oxygen evolution on open circuit as a function of potential; and (c) comparison of H/D isotope effects for open-circuit and d-c. polarization behavior. In the latter cases, an unusual and characteristic inverse isotope effect is observed.True Tafel slopes are deduced and interpreted in terms of possible mechanisms of oxygen evolution, taking account of the dependence of activation energy upon surface coverage by adsorbed intermediates.

THE ELECTROCHEMICAL BEHAVIOR OF THE NICKEL – NICKEL OXIDE ELECTRODE: PART I. KINETICS OF SELF-DISCHARGE

1959 ◽  
Vol 37 (1) ◽  
pp. 292-307 ◽  
Author(s):  
B. E. Conway ◽  
P. L. Bourgault
Keyword(s):  
Nickel Oxide ◽  
Oxygen Evolution ◽  
Open Circuit ◽  
The Self ◽  
Discharge Process ◽  
Oxide Electrode ◽  
Electrode Potentials ◽  
Temperature Loss ◽  
Tafel Slopes ◽  
Nickel Oxide Electrode

The nickel – nickel oxide electrode forms the positive plate in the charged nickel–cadmium battery. After "charging" the electrode to a chemical state represented by the non-structural formula NiOx, where x can vary from about 1.4 to 1.8 depending on the current density and temperature, loss of oxygen and a fall of potential on open circuit occurs. In the present work this "self-discharge" effect has been examined by study of (i) the rate of decay of e.m.f. on open circuit, (ii) rate of oxygen evolution on open circuit, (iii) the electrochemical capacity of the electrode, and (iv) the build-up or charging curves for the electrode. The decay behavior has been studied in aqueous KOH solutions from 0.0015 to 15 M. Tafel slopes are obtained from the plots of e.m.f. vs. log (time of decay), and abrupt changes occur at certain electrode potentials which indicate changes of rate-determining mechanism in the self-discharge process. The slopes observed are interpreted in terms of a new scheme of consecutive reactions for anodic oxygen evolution by deducing, by means of the Christiansen method, the relevant Tafel slopes. It is shown that the scheme proposed uniquely accounts for the experimental behavior and that the change of mechanism observed in the self-discharge can only be explained if two consecutive and not alternative processes are involved. The dependence of the rates of self-discharge upon OH− ion and water activity is deduced and the significance of these results is discussed.

Optimization of techno-economic cobalt doped nickel oxide electrode designed for energy storage

2018 ◽  
Author(s):  
I. A. Dhole ◽  
Y. H. Navale ◽  
Y. M. Jadhav ◽  
R. N. Mulik ◽  
S. G. Pawar ◽  
...  
Keyword(s):  
Energy Storage ◽  
Nickel Oxide ◽  
Oxide Electrode ◽  
Nickel Oxide Electrode

The nickel oxide electrode. Part 1.

1955 ◽  
Vol 51 ◽  
pp. 1433 ◽  
Author(s):  
G. W. D. Briggs ◽  
Elizabeth Jones ◽  
W. F. K. Wynne-Jones
Keyword(s):  
Nickel Oxide ◽  
Oxide Electrode ◽  
Nickel Oxide Electrode

ELECTROCHEMISTRY OF THE NICKEL OXIDE ELECTRODE: PART IV. ELECTROCHEMICAL KINETIC STUDIES OF REVERSIBLE POTENTIALS AS A FUNCTION OF DEGREE OF OXIDATION

1962 ◽  
Vol 40 (10) ◽  
pp. 1933-1942 ◽  
Author(s):  
B. E. Conway ◽  
E. Gileadi
Keyword(s):  
Nickel Oxide ◽  
Kinetic Studies ◽  
The State ◽  
Total Charge ◽  
Oxide Material ◽  
Oxide Electrode ◽  
Reversible Potential ◽  
Wide Range ◽  
Degree Of Oxidation ◽  
Nickel Oxide Electrode

Electrochemical kinetic studies have been carried out at the nickel oxide electrode showing that the reversible potential for the NiII–NiIII system is independent of the state of oxidation of the bulk oxide in the electrode over a wide range of degrees of oxidation. The properties of the electrode are shown to be determined by the state of a surface phase, which is completely charged when the bulk oxide material in the electrode has been charged to 10% of its total charge capacity. Experiments on sparingly charged electrodes have proved that charging of the bulk oxide does not commence significantly until the electrode is charged to about 1.5%. Consecutive electrochemical reactions possibly involved in the charging process are discussed.

Electrochemical Study of Mannitol Oxidation at Nickel Oxide Electrode

2003 ◽  
Vol 68 (9) ◽  
pp. 1636-1646
Author(s):  
Domenica Tonelli ◽  
Barbara Ballarin ◽  
Mario Berrettoni ◽  
Marcello Trevisani
Keyword(s):  
Nickel Oxide ◽  
Culture Medium ◽  
Electrochemical Reaction ◽  
Oxide Electrode ◽  
Experimental Conditions ◽  
Liquid Culture Medium ◽  
Viable Cells ◽  
Nickel Oxide Electrode ◽  
Kinetics Of ◽  
Overall Kinetics

The electrocatalytic oxidation of mannitol at a nickel oxide electrode was investigated. The experimental conditions for determining mannitol concentrations have been optimised taking into account the involved electrochemistry. Unlike what previously reported in the literature, our findings lead to the conclusion that both the electrochemical reaction involving the Ni(II)/Ni(III) couple and the chemical reaction between mannitol and Ni(III) are effective in determining the overall kinetics of the electrocatalytic process. The calibration line for mannitol was linear up to 20.0 mmol l-1. Mannitol determination with the nickel oxide electrode was performed in a liquid culture medium selective for Staphylococcus aureus in order to make an indirect calibration of bacterial viable cells, but the results were not satisfactory.

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