Selective photoreduction of carbon dioxide to formic acid using Cs 3 Bi 2 Cl 9 -Ir/IrO x hybrid materials

Tuning the selectivity and improving the activity of photocatalysts are among the main bottlenecks for the conversion of CO to value-added chemicals. Recently, lead-free halide perovskites have been extensively investigated as photocatalysts for the photoreduction of CO . Herein, we report a composite photocatalyst using Cs Bi Cl and Ir/IrO for the photoreduction of CO . The hybrid photocatalyst Cs Bi Cl -Ir/IrO displayed a high selectivity towards HCOOH formation with a yield of 158 ± 9 μmol g h , suppressing the formation of carbon monoxide. This is the highest yield of HCOOH reported for this class of materials. In this work, we discuss the effective strategy of combining halide perovskites with simple iridium-based catalysts for enhanced and selective photoreduction of CO to HCOOH.