Facile synthesis of ultrathin two-dimensional nanosheets-constructed MCo 2 O 4 (M = Ni, Cu, Zn) nanotubes for efficient photocatalytic oxygen evolution

under visible light irradiation, which is higher than most reported catalysts. This approach is very versatile and can be applied to synthesize other hierarchical multi-element oxides-based nanosheets-constructed nanotubes for advanced applications.