Restructuring surface lattice hydroxyls on NiSn(OH) 6 towards enhanced photoreduction of CO 2 to CO

The doping of Co 2+ into NiSn(OH) 6 resulted asymmetrical lattice Ni–OH hydroxyls, improving photoreduction of CO 2 into CO by promoting proton release and oxygen vacancy generation via lowering Ni–O bond energy and boosting charge-carrier separation.