fig1
From: Tailoring hard carbon interfaces in carbonate-based electrolytes for sodium-ion hybrid capacitors
Figure 1. Schematic of the preparation process and characterization of physicochemical properties. (A) Schematic of the synthesis of HC125@Co3O4. (B) XRD patterns of Co3O4 and HC75/125/175@Co3O4 samples. (C) TG of HC75/125/175@Co3O4 samples. (D) SEM, selected area (E) and the corresponding mapping (F-H) of HC125@Co3O4 samples. (I) nitrogen adsorption/desorption isotherms and (J) pore size distributions of HC125@Co3O4 powder.
