Journal of the Electrochemical Society p. 1183 - 1186 (1985)
Update date:2022-08-17
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Ord
Huang
The galvanostatic electrodeposition of manganese dioxide films onto a platinum substrate is studied over a thickness range from 0 to 2000 nm. At the upper end of the thickness range, optical absorption causes the ellipsometer null settings to approach within 0. 02 degree of the infinite thickness limit, at which the films are indistinguishable from substrates. The optical extinction coefficient increases with film thickness over the range 0-50 nm, but from 50 to 160 nm the films have optical constants which are independent of thickness but which depend on the deposition current density. When relatively thin films (50 nm) are transferred to alkaline electrolyte and are cycled galvanostatically, optical changes are observed which correlate well with the electrochemical behavior for both reversible partial discharge cyles and irreverisble complete discharge cycles.
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