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采用阳极氧化法在钛箔表面原位生长二氧化钛纳米管,随后在氨气氛围中氮化还原制备氮化钛纳米管,并将此电极直接作为钒电池的负极,研究其对V(Ⅱ)/V(Ⅲ)的电化学性能。通过X射线衍射(XRD)、扫描电镜(SEM)以及X射线光电子能谱(XPS)等材料测试手段对氮化钛纳米管的形貌、组成和结构进行表征。分析结果表明,氨气高温氮化后,前驱体TiO_2相转变为TiN和Ti_2N相,表面元素组成为Ti-N-O,Ti-N和Ti-O,且其形貌仍保持纳米管的微观结构。采用循环伏安,电化学阻抗和充放电测试表明,氮化钛纳米管对负极电解液中的V(Ⅱ)/V(Ⅲ)展现了优异的电催化活性和可逆性,这主要归因于氮化钛纳米管大的电化学真实表面积和快速的电子转移通道。
Titanium dioxide nanotubes were grown in situ on the surface of titanium foil by anodic oxidation and then nitrided nanotubes were prepared by nitridation and reduction in an ammonia gas atmosphere. The electrode was directly used as the negative electrode of vanadium battery. Electrochemical Properties of V (Ⅲ). The morphology, composition and structure of TiN nanotubes were characterized by XRD, SEM and XPS. The results show that the precursor TiO_2 phase is transformed into TiN and Ti_2N phase after the ammonia gas is nitrided at high temperature, and the surface elements are Ti-N-O, Ti-N and Ti-O. The morphology of nanotubes still retains the microstructure of the nanotubes. Cyclic voltammetry, electrochemical impedance and charge-discharge tests showed that titanium nitride nanotubes exhibited excellent electrocatalytic activity and reversibility for V (Ⅱ) / V (Ⅲ) in the negative electrode electrolyte, which was mainly due to Titanium Nitride Nanotubes Large Electrochemical True Surface Area and Fast Electron Transport Pathways.