fig4

Figure 4. (A) Time-lapse TEM images for single RP@N-PHCNFs, where PHCNFs are porous hollow nanofibers, during potassiation process. (B) Charge/discharge profiles of RP@N-PHCNF electrode at various current densities and cycling performance of RP@N-PHCNF anodes^[40]. Copyright 2019, American Chemical Society. (C) Bright-field TEM images and elemental mapping analysis of FeP@CNBs, where CNBs are carbon nanoboxes. (D) Cycling performance of FeP@CNBs and FeP nanocubes at 0.1 A g^-1[52]. Copyright 2019, Wiley VCH.