Supplementary Materials

Supplementary materials include high-resolution TEM images and nitrogen adsorption-desorption isotherms of P-MXene-1 and P-MXene-3, PSD of P-MXene, high-resolution XPS of pristine MXene and P-MXene, half-cell performance of the 3DHPC, and the performance of the P-MXene-2//3DHPC SIHC.