The electrochemical oxidation of manganous hydroxide

Briggs, G. W. D.; Davies, DS

doi:10.1016/0013-4686(79)87032-2

Cited by 11 publications

(1 citation statement)

References 5 publications

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“…This velocity, however, depends on the structural features of the lattice. Gabano [30] specifies the following diffusion coefficients for the tunnelled manganese dioxide modifications: [31]. This much larger diffusion velocity is caused by the two-dimensional mobility of the protons in layered lattices.…”

Section: Resultsmentioning

confidence: 99%

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO₂)

Axmann

Glemser

1993

Ber Bunsenges Phys Chem

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Cycle‐life and charge/discharge curves of pure and physically Bi2O3‐doped pyrolusite (β‐MnO2) were studied. Crystalline intermediate products of the first three semi‐cycles give information about the effects of Bi2O3. A mechanism is postulated. In the first two semi cycles pyrolusite (β‐MnO2) is converted to the layered δ‐MnO2 with β‐Mn(OH)2 in the fully discharged state. In the course of the following discharge hausmannite Mn3O4, which is electrochemically inert, is formed. No hausmannite is found in presence of Bi2O3. Pieces of information on mechanistical aspects can be gathered from the initial discharge process. During the initial discharge of β‐MnO2, δ‐MnO2 is formed as an intermediate product. In the undoped case this species can be found around MnO1.75. In presence of Bi2O3, however, δ‐MnO2 is existent nearly down to MnO1.25 over the whole discharge region. The reaction path diverges at the [MnIII(OH)4(H2O)2]− ion, dissoluted during the cycling process: in presence of Bi2O3 the reaction is controlled kinetically by a quick disproportionation of the [MnIII(OH)4(H2O)2]− ions resulting in δ‐MnO2 and β‐Mn(OH)2. In absence of Bi2O3, thermodynamical control occurs, and [MnIII(OH)4(H2O)2]− reacts with [MnII(OH)4(H2O)2]2‐ forming the electrochemical non‐reactive hausmannite Mn3O4.

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Section: Resultsmentioning

confidence: 99%

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO₂)

Axmann

Glemser

1993

Ber Bunsenges Phys Chem

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Electrochemistry of Oxide High‐Temperature Superconductors

Петрий

Tsirlina

1997

Advances in Electrochemical Sciences and Engineering

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The Electrochemical Behaviour of Manganese(II)‐Hydroxide and Manganese(II)‐Hydroxide/Aluminum Hydroxide

Bauer

Buss

Glemser

1985

Ber Bunsenges Phys Chem

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Through computer control, precipitated manganese(II)‐hydroxide and manganese(II)‐hydroxide/aluminum hydroxide are investigated as positive electrodes for secondary cells in aqueous potassium hydroxide solution with regard to charge capacity and cycling behaviour. Pure Mn(OH)2 is oxidizable to MnO1.21, the discharge capacity qd lies between 17.2 and 24.0 in mAh/g; ca. 50 cycles are measured during decreasing discharge capacity. Manganese(II)‐hydroxide/aluminum hydroxide takes up comparatively more charge with better Faraday‐efficiency and can reach the oxidation stage MnO1.48. The determined maximal discharge capacity qd with 121 mAh/g is also much greater than with Mn(OH)2; with decreasing discharge capacity 60–70 cycles are observed. The electrochemical properties are influenced by the pH value of the precipitation medium.

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The electrochemical oxidation of manganous hydroxide

Cited by 11 publications

References 5 publications

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO₂)

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO₂)

Electrochemistry of Oxide High‐Temperature Superconductors

The Electrochemical Behaviour of Manganese(II)‐Hydroxide and Manganese(II)‐Hydroxide/Aluminum Hydroxide

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The electrochemical oxidation of manganous hydroxide

Cited by 11 publications

References 5 publications

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO2)

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO2)

Electrochemistry of Oxide High‐Temperature Superconductors

The Electrochemical Behaviour of Manganese(II)‐Hydroxide and Manganese(II)‐Hydroxide/Aluminum Hydroxide

Contact Info

Product

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About

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO₂)

Effects of Bismuth(III)‐Oxide on the Structural and Electrochemical Properties of Pyrolusite (β‐MnO₂)