▎ 摘　　要

NOVELTY - Composite electrode comprises an electrode substrate and a graphene nanocrystalline porous film doped with titanium dioxide nanoparticles on the surface of the electrode substrate. USE - The composite electrode is useful in a plasma sterilizing water generating device. ADVANTAGE - The composite electrode has a wide electrochemical window (& 3.2V), large number of reactive sites and large numbers of electronic transmission channels, good catalytic performance for synthesis of sterilizing substance with strong oxidability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a method for preparing a composite electrode comprising providing an electrode substrate, simultaneously bombarding a titanium dioxide target material and a carbon target material with argon ions and irradiated with electrons, and depositing a titanium dioxide nanoparticle-doped graphene nanocrystalline porous film on the electrode substrate; and a plasma sterilizing water generating device comprising composite electrode. DESCRIPTION OF DRAWING(S) - The drawing shows a structure schematic diagram of the plasma sterilizing water generating device. 2Containing reaction liquid 3Electrode cylinder 5Plasma jet part 6Insulating fixing block 8Copper electrodes 9Composite electrodes 10High voltage power supply 11Digital oscilloscope 12Voltage probe 13Current probe