▎ 摘　　要

NOVELTY - The dispersion has a dispersion medium, 3D particulate carbon, and graphene oxide. The 3D particulate carbon and the graphene oxide are dispersed in the dispersion medium. The dispersion medium is an aqueous medium. The dispersion medium consists essentially of water, polar aprotic solvent, polar protic solvent, or mixtures of water, polar aprotic solvent, and polar protic solvent. The 3D particulate carbon has a D50 particle size distribution of from about 0.2 pm to about 20 pm, from about 0.5 pm to about 15 pm, even more from about 2 pm to about 10 pm, as determined by laser diffraction scattering in accordance with the method of ISO 13320:2020. USE - Dispersion of coated substrate for supercapacitor (all claimed) applied to nature of 3D particulate carbon, inorganic rheology modifier and carbon nanotubes/nanofibers, and ratios of constituents. ADVANTAGE - The thermal annealing of coated electrodes at 200 degrees C significantly improved all parameters in performance of the activated reduced graphene oxide (aRGO)-based supercapacitors and resulted in a more square shape of the CV curve, lower ESR, improved operation at high current densities, increase in gravimetric capacitance, and increased power and energy densities. The rGO flakes formed as a result of the thermal treatment provide improved electrical contact between aRGO grains and significantly improve the overall conductivity of electrodes. The electrical conductivity of the electrodes are improved by post-deposition annealing at 200 degrees C. The supercapacitors are comparatively cheap and easy to produce as compared to known carbon electrode-based supercapacitors. The use of hydrophobic or non-derivatised particulate carbons avoids the need for pre-processing of the carbon and reduces the cost of manufacture. The coated substrates are mass produced cheaply using widely utilized unit and equipment. The use of an inorganic rheology modifier, fumed silica, improves the stability of the dispersions and imparts suitable rheological properties for use in common coating methods. Extensive comminution of the carbon particles in order to improve dispersibility leads to loss of useful properties such as surface area and/or conductivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for producing a dispersion; (2) a method for producing a coated substrate; and (3) a coated substrate. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the electrostatic double-layer capacitors supercapacitor. Porous electrodes (301a,301b) Electrolyte (303) Separator (305) Porous 3D particulate carbon coating (307a,307b) Current collector substrate (309a, 309b)