New PDF release: Chemical Explanation (Annals of the New York Academy of

By International Society for the Philosophy of Chemistry; Joseph E. Earley, Sr.

ISBN-10: 1573314560

ISBN-13: 9781573314565

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Additional resources for Chemical Explanation (Annals of the New York Academy of Sciences, v. 988)

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Both types exhibited the same energy density of 192 W h kg-’, and power densities of 16 and 10 W kg-’, respectively. However, the achievement of higher power density in the former case entailed a lower faradaic efficiency and corrosion of the aluminium. In both types of battery, the electrolyte (2M aqueous NaCl) had to be replaced after every 4-5 hours. --Casey and Vergette” have measured the charge that is delivered by porous cadmium electrodes (formed by suitable impregnation of porous nickel electrodes) and have shown that the capacity is quantitatively dependent upon the free (pore) volume that is accessible to the solution.

Electrochem. , 1974, 121, 1541. 116 K. Micka and J. RouSar, Electrochim. Acta, 1974, 19, 499. l I 7 N. A. Hampson and J. B. Lakeman, J . Power Sources, 1979, 4, 21. 1981, 119, 3. N. A. Hampson and J. B. Lakeman, J . Appl. , 1979, 9, 403. A. Hampson and J. B. Lakeman, J . Electroanal. Chem. , 1980, 107, 177. 119 N. '" It was observed that both 'planar' and porous electrodes behave in a similar manner, which indicates that the resulting surfaces produced from both planar and porous electrodes are porous.

Lago and P l a ~ h c have o ~ ~ presented a model of the diffusional process in a twocomponent electrochemical system that they were able to verify experimentally. This model provided the basis for a rapid and simultaneous determination of porosity and tortuosity of porous media, as well as estimating molecular diffusivities. The treatment is, however, restricted to non-conducting porous media, with pores of such a size that superficial diffusivity becomes negligible. Ohms and W i e ~ e n e have r ~ ~ determined physical parameters of porous electrodes, using a porosimeter which recorded the depth of penetration of mercury into the test sample at pressures up to loo0 atmospheres.

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Chemical Explanation (Annals of the New York Academy of Sciences, v. 988) by International Society for the Philosophy of Chemistry; Joseph E. Earley, Sr.


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