Fig. 4

a TEM image of H@TNAs-1. b Corresponding selected area electron diffraction (SAED) patterns of the dotted area in a. c High-resolution TEM (HR-TEM) image of H@TNAs-1
a TEM image of H@TNAs-1. b Corresponding selected area electron diffraction (SAED) patterns of the dotted area in a. c High-resolution TEM (HR-TEM) image of H@TNAs-1