Abstract: A new SnO₂-SnS₂nanosized composite particle was prepared by ion exchanging re-action. The composition, structure and size of this material were determined by XRD, TEM and X-EDAS. It′s shown that in the sample the nanosized particle SnO₂was partly coated by SnS₂Its average particle size was ca . 5 nm. The properties of UV-V is diffusive reflection spectrum and photoelectric chemistry were investigated. It was observed that the absorbance range of SnO₂-SnS₂nanosized composite particle was broadened to longer wavelength area. After being prepared to be a working electrode, its value of photocurrent and IPCEwere both highly improved, compared with pure SnO₂and SnS₂electrode.

Key words: SnO₂-SnS₂, Composite nanoparticle, Photoelectric conversion.