The electrical conductivity of a laboratory lead dioxide electrode immersed in a solution of HISO, was measured by the four-point dc method using a current step. Analysis of the potential drop as function of the time yielded information about conductivity of the solid phase, double layer capacity re
Degree of utilization and specific effective surface area of electrocatalysts in porous electrodes
β Scribed by K. Mund; F.v. Sturm
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 644 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0013-4686
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β¦ Synopsis
In the development of electrodes, in addition to the space-time yield it IS often us&l to determine and to establish the degree of utilization of the catalyst. This is particularly important in the case of an expensive or scarce material. To evaluate the catalyst, such terms as the "degree of utilization y" (cd quotient with and without transport limitation) and the "specific ctkctivc surface area J" (product of q and the specific surface area s of the catalyst) are introduced and derived for blpor-ous electrodes.
The given equations denote lhe influence of the pore dlmenxons and the reaction parameters.
The degree of utilkation can be further affected by the electrolytic and electronic resmtance in porous electrodes.
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Dissolution of natural stone such as marble is not limited to its surface. The porous structure, known to play an important role in stone decay, is also affected by the conditions of dissolution. In the present work, the changes in pore size distribution of Pentelic marble particles accompanying che
β£-MnO 2 has been made using a solid state synthesis and the specific surface area then modified through milling. The formation of β£-MnO 2 (specific surface area 96 m 2 g -1 ) has been studied by SEM and powder XRD prior to milling. Electrode films (cast using MnO 2 , graphite and PVDF) have been inv