The effects of the solution pH on the el ectrochemical properties of poly-o-methylani-line are described in this paper. The experimental results show that the cyclic voltammogram

oxidation potential

film colour

charge-discharge capacity

electronic absorption spectrum and electrochemical activity of poly-o-methylaniline depend on the pH value. During the potential sweep

the film colour of poly-o-methylaniline at pH4.13

and the electroche-mical activity is also disappeared.