RuO_(2)-IrO_(2)-TiO_(2)/NbO_(x)-TiO_(2)/Ti复合阳极的制备及性能

Preparation and performance of RuO_(2)-IrO_(2)-TiO_(2)/NbO_(x)-TiO_(2)/Ti composite anode

以Ti/Nb的质量比为100、75、50、25和10配制了中间层溶液,以原子比Ir∶Ru∶Ti=1∶3∶3配制了活性层溶液,采用热分解法制备了钛基铌-钛中间层的涂层电极。对其在酸性析氧条件下的改性性能进行研究,并分析其失效机理。利用X射线衍射(XRD)、扫描电镜(SEM)和能谱仪(EDS)分析其失效前后的物相和形貌变化,通过强化电解寿命实验、电化学分析等研究了RuO_(2)-IrO_(2)-TiO_(2)/NbO_(x)-TiO_(2)/Ti电极在酸性体系中的性能。结果表明:在酸性体系下,电极失效主要是由活性层的溶解脱落以及电极表面生成不导电的钛氧化物造成的;中间层铌-钛比为1∶10的涂层电极寿命更佳,较未掺杂中间层的涂层阳极寿命提升明显,但电压增加;综合考虑能耗与服役时间,中间层铌-钛比为1∶25的电极更符合实际生产的需求。

Intermediate layer solutions were prepared with Ti/Nb mass ratios of 100,75,50,25 and 10,and active layer solutions were prepared with an atomic ratio of Ir∶Ru∶Ti=1∶3∶3.Titanium based niobium-titanium intermediate layer coated electrodes were prepared using thermal decomposition method.The modification performance of the electrodes under acidic oxygen evolution conditions was studied,and their failure mechanism was analyzed.The phase and morphology changes of the electrodes before and after failure were analyzed using X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS)analysis.The performance of RuO_(2)-IrO_(2)-TiO_(2)/NbO_(x)-TiO_(2)/Ti electrodes in acidic systems was studied by enhanced electrochemical lifetime experiments and electrochemical analysis.The results show that in acidic systems,electrode failure is mainly caused by the dissolution and detachment of the active layer,as well as the formation of non-conductive titanium oxide on the electrode surface.The coating electrode with a niobium-titanium ratio of 1∶10 in the intermediate layer has a better lifespan,and its lifespan is significantly improved compared to the anode without doping the intermediate layer,but the voltage increases.Taking into account energy consumption and service time,an electrode with a niobium-titanium ratio of 1∶25 in the intermediate layer is more suitable for practical production needs.