TiB_2基RuO_2+TiO_2涂层的电催化性能

Electrocatalytic Properties of RuO_2-TiO_2 and TiB_2 Coated Ti Based Anodes

用磁控溅射法在钛基体表面溅射TiB2中间层,以此为基体用热分解法制备了(Ru,Ti)氧化物涂层钛电极,用SEM、XRD、电化学工作站等手段对样品的性能和结构进行了表征。结果表明,含TiB2中间层的钛阳极表面涂层具有非连续状裂纹结构,钛基体和氧化物涂层的界面呈现紧密结合的状态,其电催化析氯性能优于传统钛阳极。选用TiB2中间层作为催化电极的载体,可改善基体和氧化物涂层的结合,延缓涂层的脱落,可避免基体和涂层间生成TiO2电阻膜,延缓涂层的失效;加入TiB2中间层可降低内阻,改善电子的传输能力,降低析氯电位,提高电极的催化活性和节能降耗。

Ti-based anodes with a top layer RuO2-TiO2 oxides mixture and an inter-layer TiB2 were prepared by two step processes, i.e. first the TiB2 film was deposited on Ti-based anodes by means of magnetron sputtering and then the top layer RuO2-TiO2 oxides mixture was further deposited by a thermal decomposition process. The microstructure and phase constituent of the coatings were characterized by means of SEM and XRD, and the electrochemical properties of the anodes were evaluated by the polarization curves. The results show that the interlayer TiB2 plays important role in suppressing the formation of the cross cracks of the RuO2-TiO2 layer and, facilitating the adhesion of the top layer to the substrate,therefore the RuO2-TiO2 and TiB2coated Ti-anodes exhibit better electrocatalytic properties rather than the only RuO2-TiO2 coated ones. In the meanwhile, the TiB2 interlayer can suppress the occurrence of a TiO2 film at the interface coating/substrate thus prolongs the life time of Ti-anodes. Besides, the inducing of the TiB2 interlayer can reduce the potential of chlorine evolution, and thereby enhance the current efficiency of the Ti-anodes effectively.