Fig. 1: Synthesis and characterization of single-layer NiFeB hydroxide nanosheets.

a Schematic synthetic procedures. b TEM image of the nanosheets. Inset: thickness of the nanosheets at the edge of a wrinkle. c EDS elemental maps for Ni, Fe, and B. d, e B 1s XPS and XRD pattern of the NiFeB hydroxide nanosheets. Inset of e: a model of the crystal structure.