Abstract：In the preparation process of titanium-based metal oxide electrodes, the mud cracking of the antimony-doped tin oxide (ATO) layer is a key problem that affects the performance of the electrode. Using dense titanium plate, titanium metal powder and porous titanium plate as the matrix, the effect of the surface microstructure of the titanium-based material on the mud cracking phenomenon of the ATO layer was experimentally studied, and the surface morphology, impedance and oxidation resistance of the electrode were characterized and analyzed. The results showed that the micron-level thin-walled bending structure of the matrix material had a significant relief effect on the stress of the ATO layer, and the tunnel wall produced by etching had a separation and anchoring effect on the ATO layer. Based on the above two reasons, the mud crack of the Ti-based ATO layer was effectively eliminated and the performance of the electrode was greatly improved. The charge transfer resistance (Rct) of the ATO electrode prepared with the porous titanium plate as the matrix was about 0.5 Ω, which was only 1/20 of the dense titanium plate matrix. The current-time curve (scanning potential: 2.0 V, electrolyte: 0.5 mol/L H2SO4) showed that the stable current density of the porous titanium plate-based ATO electrode was 40 mA/cm2, while the dense titanium plate-based ATO electrode was only 0.2 mA/cm2.
DUO Yalin,WANG Lan,ZHANG Ye et al. Effect of Surface Microstructure on Mud Crack in Antimony-Doped Tin Oxide Layer of Ti Electrode[J]. Chemical Reaction Engineering and Technology, 2022, 38(6): 560-565.
