Fig. 1: Fabrication of rGMXn sponges.

a Schematic illustration of the synthesis of rGMXn sponges. b Axial and c radial SEM images of rGMXn sponges. d XRD patterns of rGMXn and rGMAX5 sponges (n = 5, 10, and 20). e XPS Ti 2p spectra of rGMX5 sponge.

a Schematic illustration of the synthesis of rGMXn sponges. b Axial and c radial SEM images of rGMXn sponges. d XRD patterns of rGMXn and rGMAX5 sponges (n = 5, 10, and 20). e XPS Ti 2p spectra of rGMX5 sponge.