High-resolution scanning electron microscopy (HRSEM) imaging was conducted using a Zeiss GeminiSEM 300 system. HRSEM imaging of materials containing jellyfish biomass were first coated with a 10 nm layer of gold nanoparticles using a PVD-20 Magnetron Sputtering system (Vinci). Transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and energy-dispersive X-ray spectroscopy (EDS) analyses were conducted using a Themis Z G3 system (ThermoFisher). Cross-sectional imaging and lamella preparation for TEM analysis were conducted using a Helios Nanolab 460F1Lite Dual Beam Focused Ion Beam/Scanning Electron Microscope (FIB/SEM, ThermoFisher). Raman spectroscopy measurements were conducted using an InVia Confocal Raman Microscope (Renishaw) at a wavelength of 514 nm. ImageJ software was to analyze and compute the porosity from the HRSEM imaging.