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(a) Nitrogen adsorption/desorption isotherms; (b) DFT pore-size distribution plot of 1.0 wt % Li+-doped SnO2 porous nanofibers; (c) XRD patterns of pristine and Li+-doped SnO2 porous nanofibers; (d) XPS full spectrum of 1.0 wt % Li+-doped SnO2 porous nanofibers, which confirmed the presence of Li 1s (~55.0 eV) in the doping sample.
