MEASUREMENT OF TRUE SURFACE AREA IN ELECTRODES.
Quarterly technical progress rept. no. 1, 15 Dec 6415 Mar 65,
BATTELLE MEMORIAL INST COLUMBUS OHIO
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The objective of this program is to understand and develop an electrochemical method for determining surface areas in porous electrodes. Initial work will be concerned with trying to understand measurements on single uniform pores, capillaries. In this report three possible approaches to area measurement are discussed. Double-layer capacitance is selected for initial study but the effects of diffusion, adsorption, and filming will be kept in mind for possible independent checks of true surface area in porous electrodes. Geometric effects on capacitance are investigated briefly, both theoretically and experimentally. The theoretical prediction is that double-layer capacitance in porous electrodes may be treated as flat-plate capacitors, providing the radii of the small pores are larger than about 100 A. Pertinent experimental techniques are reviewed. The use of fast response pulses appears to hold the most promise for successful estimation of true surface area. Author