Abstract
ABSTRACT We demonstrated a room-temperature synthesis of nontoxic polar-solvent-soluble sulfonated polyaniline (SPAN). Polyaniline emeraldine salt (PANI ES) was used as starting material for a simple moistureproof sulfonation in producing SPAN. The optimum condition was obtained at a ClSO3H concentration of 30% in sulfuric acid for 72 h of sulfonation. FTIR and Raman spectra revealed that the sulfonic group (-SO3H) is covalently bonded to the PANI ES chain. Electrical conductivity measurement of SPAN provides the conductivity value within the semiconductor range. The obtained power conversion efficiency is twice higher than a graphite-based counter electrode due to the good electrocatalytic activity of SPAN.
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