Electrochromic Behavior of a Lambda‐ MnO2 Electrode Accompanying Li + ‐Insertion in an Aqueous Phase

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Abstract
Electrochromism of spinel‐type manganese oxide accompanying an ‐insertion in an aqueous phase was examined by visual light spectrometry. An absorbance spectrum for lithiated manganese oxide gave lower absorbance in the wavelength range <700 nm than did an ‐extracted one. The greatest difference was observed at ∼ 450 nm and is explained by the difference between the spectra for and . A reversible change in absorbance at 450 nm occurred with the ‐insertion/extraction reaction. Cyclic voltammetry indicated that the absorbance change couples with the electrochemical response of the manganese oxide to ions.

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