摘要:We describe the synthesis and visible-light CO
2 photoreduction catalytic properties of a three-component composite consisting of AgI, AgIO
3, and single-walled carbon nanotubes (SWCNTs). The catalyst is synthesized by immersing SWCNTs encapsulating iodine molecules in AgNO
3 aqueous solution, during which neutral iodine (I
2) molecules encapsulated in SWCNTs transform disproportionately to I
5+ (AgIO
3) and I
− (AgI), as revealed from the characterization of the composite by Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. In addition, photoirradiation experiments using a solar-simulator (AM1.5G) showed that the obtained three-component composite works as a CO
2 photoreduction catalyst under visible light despite the wide band gap of AgIO
3, suggesting possible transfer of the visible light-excited electron from AgI via SWCNTs.