Alkali metal ion doped titanium dioxide coated gradient titanium black composite porous ceramic coating electrode and preparation method thereof

The invention discloses an alkali metal ion doped titanium dioxide coated gradient titanium black composite porous ceramic coating electrode and a preparation method thereof, and belongs to the technical field of sewage treatment. The method comprises the following steps: 1) preparing slurry; 2) covering the surface of a titanium or titanium alloy plate with the slurry; 3) drying; and 4) sintering, and then cooling to obtain the alkali metal ion doped titanium dioxide coated gradient titanium black composite porous ceramic coating electrode. The preparation method disclosed by the invention is simple in process, safe, reliable, green and pollution-free, is convenient for large-scale production of large-area special-shaped porous coating electrodes, and effectively solves the problems that an existing electrolytic method electrode preparation process is complicated, high in cost, short in service life, incapable of stably running for a long time under high current density and the like; the prepared gradient ti