钛基β-PbO_2电极α-PbO_2中间层的形貌与结构

Morphology and structure of α-PbO_2 interlayer of β-PbO_2 electrode

为了改善钛基β-PbO2电极的性能，以含SnCl4和SbCl3的异丙醇-浓盐酸混合液为原料，采用热沉积法制备了SnO2-Sb2O3底层，再采用电沉积方法在由PbO和NaOH组成的电解液中制备了α-PbO2中间层。利用扫描电镜（SEM）和X射线衍射（XRD）考察了SnO2-Sb2O3底层的形貌与结构，并研究了电沉积时的电流密度、温度和时间对α—PbO2中间层的影响。实验结果表明，SnO2～Sb2O3底层主要由SnO2晶体组成，其表面呈干裂泥土状。在电沉积α-PbO2中间层时，电流密度不宜大于3mA／cm^2，温度宜为40～60℃，时间应控制在1．0h左右。

Aiming at improving the performance of β-PbO2 electrode, a SnO2-Sb2O3 primary coating was prepared by thermal deposition with an isopropyl alcohol and concentrated hydrochloric acid mixed solution containing SnCl4 and SbCl3, and a α-PbO2 interlayer was subsequently electrodeposited from a bath consisting of PbO and NaOH. The morphology and structure of SnO2-Sb2O3 primary coating were examined by scanning electron microscopy （SEM） and X-ray diffraction （XRD）, and the effects of current density, temperature, and time in electrodeposition on α-PbO2 interlayer were studied. The results showed that the SnO2-Sb2O3 primary coating is mainly composed of SnO2 and presents a mud-crack surface morphology. The suitable parameters for electrodeposition of α-PbO2 interlayer are current density ≤3 mA/cm^2, temperature 40-60 ℃, and time ca. 1.0 h.