“…However, compared to the large amount of research work done in the visible range with light wavelength of 420–550 nm, red light with low photoenergy has been rarely used for photocatalysis. To date, only a very limited number of photocatalysts have been reported for photocatalytic CO 2 reduction under light irradiation above 600 nm, such as Os(II)–Re(I) supramolecular complexes, [ 8 ] Ru complex/Ni–Al layered double hydroxide, [ 9 ] carbon dots/Bi 2 WO 6 , [ 10 ] ZnO/carbon dots, [ 11 ] Bi 2 O 3− x with oxygen vacancies, [ 12 ] CsPbBr 3 /WO 3 , [ 13 ] g‐C 3 N 4 /WO 3 ·H 2 O/Pd heterostructure, [ 14 ] etc. Among the studied photocatalysts, most are compositing materials, suffering from complicated preparation, low photocatalytic activity, and potential environmental issues resulting from the harmful heavy metals such as Cd, W, and Pb.…”