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a) The lattice mismatch in the crystal structure of bismuth metal after surface oxidation. b) Schematic illustration of the preparation of 2D bismuth oxyhydroxide and oxysulfide. c) The AFM images of bismuth oxyhydroxide nanosheets. d,e) TEM image and corresponding ESD mapping. f) The HRTEM image with the corresponding FFT pattern. g) Bi 4f region and h) O 1s region of XPS spectra.
