摘要
以纳米TiN粉体和氯铱酸的混合液为涂液,采用浸渍–热分解法制备了含IrOx–TiO2中间层的钛基氧化铱电极。研究了IrOx–TiO2中间层对钛基氧化铱电极的显微结构及析氧寿命的影响。结果表明,TiN作为前驱体氧化生成金红石相的二氧化钛与氧化铱形成固溶体,并与钛基体形成了共格界面,从而构成了铱钛复合氧化物中间层,中间层的加入没有改变传统钛基氧化铱电极的基本形貌特征和组成,因而具有相同的电催化响应特性;由于中间层中二氧化钛的固溶和与钛基体的共格结合起到机械和化学的双重作用,电极的析氧寿命明显延长,从而通过实验手段证明了氧化铱电极失效的主要机制是由于钛基界面的劣化引起的。
The Ti-based IrO2 electrode with iridium- titanium oxide interlayer was prepared by impregnation- thermal decomposition method. An IrOx-TiO2 interlayer was obtained from a mixture of TiN nanoparticles and H2IrCl6 solution. The effect of the IrOx-TiO2 interlayer on the microstructure and oxygen evolution behavior of Ti/IrO2- coated electrode was studied. The experimental results showed that the TiO2 produced by oxidation with TiN as precursor and IrO2 form a binary solid solution in a rutile phase, forming an iridium and titanium composite oxide interlayer. Moreover, a coherent interface is formed between the interlayer and titanium substrate. The surface morphology and composition of the traditional Ti/IrO2 coating electrode were found to be changed because of adding the interlayer, accordingly, the electrocatalytic response feature remained the same. Due to the mechanical and chemical effects resulting from the formation of the IrOx-TiO2 solid solution and the coherent interface, the service life of Ti/IrO2 coating electrode is greatly improved. It was proved by experiment that the Ti/IrO2 deactivation could be the consequence of titanium substrate deterioration.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2010年第4期66-69,共4页
Electroplating & Finishing
关键词
氧化铱
氧化钛
中间层
电催化
析氧
寿命
iridium oxide
titanium oxide
interlayer
electrocatalysis
oxygen evolution
service life
