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  • 1
    Electronic Resource
    Electronic Resource
    Cyclic voltammetric studies of pasted nickel hydroxide electrode microencapsulated by cobalt (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 1377-1382 
    Details
    ISSN: 1572-8838
    Keywords: cyclic voltammetry ; microencapsulation ; nickel hydroxide electrode ; oxygen evolution overpotential ; proton diffusion coefficient ; reversibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Spherical nickel hydroxide microencapsulated by cobalt has been used as the electrochemically active material in pasted-type nickel electrodes of rechargeable alkaline batteries. Cobalt coating on the surface of nickel hydroxide particles can be converted to CoOOH during charge. Well distributed CoOOH forms the conductive network on the surface of nickel hydroxide particles, thereby leading to higher utilization of active material. Cyclic voltammetric studies suggest that nickel hydroxide microencapsulated by cobalt has better reversibility of the Ni(OH)2/NiOOH redox couple, greater discharge capacity and higher oxygen evolution overpotential than nickel hydroxide with added cobalt metal powder as a conductor. The mechanism of the electrode reaction is still found to be controlled by proton diffusion, and the proton diffusion coefficient is 1. 2×10−9cm2s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003421701762
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ammonium fixation by clay minerals in different layers of two paddy soils after flooding (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 152-156 
    Details
    ISSN: 1432-0789
    Keywords: Key words Non-exchangeable ammonium ; Paddy soils ; Redox potential ; Organic substance ; Nitrogen immobilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The influence of flooding and cellulose addition on the fixation of NH4 + in different soil layers of two paddy soils from China (an entisol and an ultisol) was investigated. In both soils the content of total reducing substances (TRS) sharply increased during the first days after flooding and was highest in the anoxic layers. This increase, which was more pronounced in the entisol with the higher total C content, was accompanied by an increase in the concentration of non-exchangeable NH4 + in both soils. The increase in mineralization after flooding, resulting in higher concentrations of exchangeable NH4 +, favoured the fixation of NH4 +. Although the application of cellulose resulted in higher TRS contents, the fixation of NH4 + ions decreased, which may have been the result of microbiological N immobilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050538
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    Paper (German National Licenses)
    Fulltext
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