“…The oxyhalide main focused on bismuth oxyhalides with adjustable halogen types and oxygen/halogen ratio, such as BiOCl, BiOBr, BiOI, Bi 12 O 17 Cl 2 , Bi 3 O 4 Br, Bi 4 O 5 Br 2 , and so on 26, 27, 28, 29, 30, 31. The oxometallate mainly includes Ca 2 Nb 3 O 10 , Ba 5 Nb 4 O 15 , SnNb 2 O 6 , K 4 Nb 6 O 17 , SrNb 2 O 6 , HNbWO 6 , Bi 2 WO 6 , Bi 2 MoO 6 , and BiVO 4 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43. The hydroxides can be classified as single metal hydroxides (e.g., Ni(OH) 2 ) and layered double hydroxides (LDHs) including CoCo LDHs, NiCo LDHs, NiFe LDHs, Ni 0.75 V 0.25 LDHs, CoMn LDHs, CoFe LDHs, NiCoFe LDHs, ZnAl LDHs, CuCr LDHs, and MgAl LDHs 44, 45, 46, 47, 48, 49, 50, 51, 52, 53.…”