TiN纳米管阵列/金属电极的构筑及其电催化性能

Fabrication of TiN Nanotube Array Supported Metals Electrode and Evaluation of Their Electrocatalytic Performance

通过阳极氧化在金属钛上生长氧化钛(TiO_(2))纳米管阵列(NTAs),再经氨-氮化制得氮化钛(TiN)纳米管阵列。利用多电流阶跃法,使金属镍(Ni)均匀沉积在TiN-NTAs表面,形成多孔Ni@TiN-NTAs电极。通过等离子溅射,在电极上沉积Au层,可分别获得Ni@TiN-NTAs、Au@TiN-NTAs和Au/Ni@TiN-NTAs系列微结构复合电极。借助X射线衍射(XRD)、扫描电镜(SEM)和能谱分析(EDS)等手段对各产物进行了综合表征,并分别研究了这些电极在偏硼酸钠(NaBO_(2))碱性溶液中的电化学行为。研究结果表明:所得TiO_(2)和TiN纳米管孔道结构规则,物相纯度较高,对过渡金属(Ni、Au)具有良好的负载和分散作用。在给定电解条件下,Au/Ni@TiN-NTAs表现出较低的电催化活性,但3种电解产物中均未检测到BH-4。

Titanium oxide TiO_(2) nano tube arrays(NTAs)were grown on titanium(Ti)base by anodic oxidation,and were further transformed to TiN-NTAs via ammonia nitriding route.The multi-current step technique was adopted to uniformly depositing Ni layer on the surface of TiN-NTAs for fabricating the Ni@TiN-NTAs electrode with more micropores.The serial multi-shaped composite electrodes(Ni@TiN-NTAs,Au@TiN-NTAs and Au/Ni@TiN-NTAs)were obtained through plasma sputtering and deposition of Au.The comprehensive characterization for these products and relative intermediate were carried out by means of X-ray diffraction(XRD),scanning electron microscope(SEM)and Energy Dispersive Spectrometer(SEM-EDS)techniques,and the electrochemical behavior of these electrodes in NaBO_(2) alkaline solution was also investigated.The results prove that the obtained TiO_(2) and TiN nanotubes have regular pore structure,high phase purity,and good loading and dispersive ability for the transition metals(Ni,Au).The Au/Ni@TiNNTAs electrode shows a degree of electrocatalytic reduction activity for BO^(-)_(2),but no BH4-formation was found in the product solution.