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Poly-p-Nitrophenylpyrrole Films as Electrodes for Batteries

IP.com Disclosure Number: IPCOM000049041D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Diaz, AF: AUTHOR [+2]

Abstract

The electrochemical properties of poly-p-nitrophenylpyrrole films render them useful for battery applications. These films can be prepared electrochemically from p-nitrophenylpyrrole. The polymer in the films is electroactive and it can be switched between the cationic, neutral and anionic state. The material is stable in these reactions in aprotic electrolyte, e.g., Et NC10(4)/CH(3)CN, and can be switched repeatedly with coulombic reversibility. The pyrrole structure is oxidized at +0.7 V (vs. SSCE) and the nitrophenyl group is reduced at -1.1 V (vs. SSCE). The The equilibrium stoichiometry of these reactions is 0.18 F/mole of pyrrole unit for the oxidation reaction (100 mC/mg of film) and one F/mole of nitrophenyl group for the reduction reaction (500 mC/mg of film).

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Poly-p-Nitrophenylpyrrole Films as Electrodes for Batteries

The electrochemical properties of poly-p-nitrophenylpyrrole films render them useful for battery applications. These films can be prepared electrochemically from p-nitrophenylpyrrole. The polymer in the films is electroactive and it can be switched between the cationic, neutral and anionic state. The material is stable in these reactions in aprotic electrolyte, e.g., Et NC10(4)/CH(3)CN, and can be switched repeatedly with coulombic reversibility. The pyrrole structure is oxidized at +0.7 V (vs. SSCE) and the nitrophenyl group is reduced at -1.1 V (vs. SSCE). The The equilibrium stoichiometry of these reactions is 0.18 F/mole of pyrrole unit for the oxidation reaction (100 mC/mg of film) and one F/mole of nitrophenyl group for the reduction reaction (500 mC/mg of film). In practice, these are lower limits because higher charge densities can be introduced into these films. The oxidation-reduction reaction of these films is fast, e.g., a 0.02 mg film is switched in about 0.7 second using only 0.6 V over potential.

The films are stable in ambient conditions both in the neutral and the oxidized form, which is an advantage when considering the storing and handling aspects of these materials. The oxidation reaction is not directly affected by the presence of oxygen or moisture in the cell and can be operated in aprotic, mixed hydroxylic and aqueous solvents neutral and acidic). The reduction reaction will switc...