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The great concern for environmental problems, as well as the need for polymeric materials with more versatile properties for their application, currently lead to a growing interest in the development of polymeric composites based on agro-industrial waste. In this work, novel composites of poly(3-hexylthiophene-2,5-diyl)/natural-silicon dioxide (P3HT/N-SiO2) were synthesized by extracting SiO2 from an agro-industrial waste (rice husk), they were characterized and applied to electrochromic devices (ECD). Composites were prepared by in-situ polymerization of 3HT monomer in the presence of N-SiO2. To evaluate the effect of the incorporation of N-SiO2 in P3HT on its physicochemical properties and its application in electrochromic devices, the N-SiO2 concentration was varied. The results revealed improved properties of P3HT with the addition of N-SiO2, such as higher crystallinity and decreased bandgap. Likewise, it was determined that the presence of N-SiO2 in P3HT increases the optical contrast in single ECD (glass/ITO/composite/polymeric electrolyte/ITO/glass architecture design) in a certain wavelength range. The procedure for obtaining P3HT/N-SiO2 composites is simple and inexpensive, which in addition to their interesting properties makes them potential candidates for their application in optoelectronic devices. [ABSTRACT FROM AUTHOR]