Liu and co-workers used ZTCs with different pore sizes as theoretical models to study the effect of pore geometry on capacitance. According to their study, the charge compensation per carbon (CCpC) determines the capacitance, and a high CCpC tends to be related to a small radius of curvature of the graphene. Tang and co-workers used NPGs with different graphene-stacking layers (the specific surface area changed accordingly) to explore the influence of the specific surface area on the total capacitance and the origin of the total capacitance of 3D porous graphene. These results suggest that the origin of the capacitance is highly related to the specific surface area, pore structure, and surface chemistry of the carbon materials. The critical factor for obtaining carbon materials with large capacitance is the presence of fewer graphene-stacking layers in the carbon frameworks with appropriate surface modification to ensure a large electrical double-layer capacitance. The ordered and well-defined structures of ideal 3D graphene materials are particularly interesting in exploring the origin of capacitance and methods to improve it further.