1,2,3- and 1,2,4-Benzenetricarboxylic ligands: investigation of unusual 2D and 3D polymeric nets with potassium ion

Novel Lamellar Tetrapotassium Pyromellitic Organic for Robust High‐Capacity Potassium Storage

“…[19] Raman spectra (Figure 1 d) also show two peaks at 1567 and 1370 cm À1 corresponding to the u as (-COO) and u s (-COO) of K 4 PM, respectively, obviously different from the PMA. [19,20] Accordingly, the crystalline structure of K 4 PM is simulated as demonstrated in Figures 1 e and S2, which features the layered structure with an interlayer space of 4.71 , much larger than that of graphite materials (3.35 ), [21] possibly beneficial for the large ion storage. Moreover, the typical scanning electron microscope (SEM) images of K 4 PM exhibit the lamellar structure (Figures 1 f and g) and corresponding energy disperse spectroscopy (EDS) mapping images further identify the uniform distribution of C, O, and K elements (Figure 1 h).…”