Fig. 4: Surface area, hydrophobicity, and adsorbability of the 3D porous TMNs.

a–c N₂ adsorption and desorption isotherms of the 3D porous VN, MoN, and WN. d–f Surface hydrophobicity of the 3D porous VN, MoN, and WN. g–i Excellent adsorbability of the 3D porous VN, MoN, and WN.