电镀镍中间层对钛基二氧化铅阳极性能的影响

Effect of electroplating nickel inter-layer on performance of Ti-based lead dioxide electrodes

摘要:

通过阴极电镀在钛基表面制备出镍中间层，随后在其上再进行阳极电沉积β-PbO2涂层来制备Ti/Ni/PbO2电极，并与无镍中间层的Ti/PbO2电极进行对比。通过微结构分析、1mol/LH2SO4溶液中的加速寿命试验、电化学性能测试和电氧化苯酚模拟废水行为研究，考察了电镀镍中间层对二氧化铅涂层电极的结构和性能的影响。结果表明，电镀镍中间层的引入不仅使活性β-PbO2涂层的晶粒细化，增强了电极的催化活性，而且有效地改善了电极表面的导电性，降低了槽压，使得电极表面电势均匀分布，从而明显地延长了电极寿命，降低了电催化氧化降解苯酚模拟废水的能耗。

Abstract:

A nickel intermediate layer was firstly electrodeposited onto the titanium substrate by cathodic electroplating, then the β-PbO2 coating was electrosynthesized by anodic oxidation. The resulting Ti/Ni/PbO2 was compared with the Ti/PbO2 electrodes without intermediate layer. The effect of plating nickel intermediate layer on the structure and performance of PbO2-coated electrodes were investigated by microstructure characterization, accelerated life test in 1mol/L H2SO4 solution, electrochemical performance and electro-oxidation behavior of simulated phenol wastewater. The results indicated that the introduction of nickel electroplating intermediate layer leads to the grain refinement of the surface active β-PbO2 coating, thus enhancing the catalytic performance of PbO2-coated electrodes. Furthermore, the Ni intermediate improves the conductivity of the electrode, thus significantly reducing cell voltage, enhancing potential uniform distribution of the electrode surface, extending the electrode lifetime and reducing the energy consumption of electrocatalytic oxidation of simulated phenol wastewater. Besides, the introduction of nickel inter-layer might enhance the catalytic performance of the electrode.