Fig. 1

Characterizations of Mn-N-CNSs: a TEM images of Mn-N-CNSs, (inset, high resolution TEM images), b Size distributions of Mn-N-CNSs, c XRD patterns of the Mn-N-CNSs, d AFM image of Mn-N-CNSs, e Size and height distribution of Mn-N-CNSs, f FTIR spectra of the Mn-N-CNSs