| 초록 |
Photocatalytic CO2 conversion to fuel offers an exciting prospect for solar energy storage and transportation thereof. Several photocatalysts have been employed for CO2 photoreduction; the challenge of realizing a low-cost, readily synthesized photocorrosion-stable material that absorbs and utilizes a broad portion of the solar light. Herein, a mesoporous p-n heterojunction material, CuxO–TiO2 (x = 1, 2), is synthesized via annealing of Cu and Ti precursors. Such an experimental approach in which two materials of diverse bandgaps are coupled provides a simultaneous opportunity for greater light absorption and rapid charge separation due to the intrinsic p–n heterojunction nature. The developed photocatalyst demonstrates an improved photocatalytic activity with the CO2 reduction of our optimal sample (augmented light absorption, efficacious charge separation and mesoporosity) that utilizes no metal cocatalysts, a remarkable CH4 yield of 221.63 ppm·g−1·h−1 is achieved. |
