Self-doped poly(indole-5-carboxylic acid) (P5CO2H) is electrodeposited from acetonitrile containing 0.1M LiClO4 as electrolyte and characterized by UV–vis, IR, cyclic voltammetry, and scanning electron microscopy techniques. The polymer is evaluated as a cathode active material together with a Zn anode in rechargeable cells containing 1M ZnSO4 at pH 5. The cell shows an open circuit voltage of 1.36 V and a specific capacity of 67 Ah kg−1. The ac impedance study shows a predominant diffusion mechanism. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 917–922, 2005
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