The hybrid organic−inorganic material formed by polyaniline and the hexacyanoferrate
anion (PAni/HCF) constitutes a molecular hybrid where the anchoring of the electroactive
anion within the polymer leads to its application as a functional material that harnesses
the activity of the molecular species. Transport measurements of the hybrid have been carried
out, both by cyclic voltammetry at different scan rates and ac impedance spectroscopy. An
apparent diffusion coefficient of 5 × 10-8 cm2/s and an activation energy of 15.5 kJ/mol (0.16
eV) have been obtained. The particular application of these hybrids to energy storage is
shown here through their use as cathodes in lithium rechargeable cells. In this respect, the
PAni/HCF hybrids show very good cyclabilities and high specific charges of up to 140 A·h/kg, unprecedented for this type of hybrid materials.