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采用水热法在钛片表面直接生长二氧化钛纳米线(TiO_2 NWs),随后通过氨氮还原转化为氮化钛纳米线(TiN NWs)。利用扫描电镜(SEM)、透射电镜(TEM)、X射线光电子能谱(XPS)、循环伏安法(CV)和电化学阻抗谱(EIS)对材料的组成、微观结构和电极过程动力学的特征进行表征。结果表明,TiN NWs纳米线的直径约20-50 nm,长度超过5μm,其表面可能存在Ti-N键、Ti-O键和O-Ti-N键,这种含氮和含氧的化学态使得TiN NWs电极具有更好的电导性和电催化性能。TiN NWs电极对V(Ⅱ)/V(Ⅲ)离子表现出更好的可逆性,其电极反应电阻R_(ct)值比TiO_2 NWs和石墨电极分别小约20倍和10倍。同时,TiN NWs电极上V(Ⅲ)还原反应的速率常数为5.21×10~(-4 )cm·s~(-1),约是石墨电极(速率常数9.63×10~(-5 )cm·s~(-1)的5倍,这可归因于TiN NWs的一维纳米线微结构特征及其较高的电催化性能。
Titanium dioxide nanowires (TiO 2 NWs) were directly grown on the surface of titanium by hydrothermal method and then converted to TiN NWs by ammonia nitrogen reduction. The composition, microstructure and electrode kinetics of the materials were characterized by SEM, TEM, XPS, CV and EIS Characteristics were characterized. The results show that the TiN NWs nanowires have a diameter of about 20-50 nm and a length of more than 5 μm. There may exist Ti-N bond, Ti-O bond and O-Ti-N bond on the surface of the nanowires. TiN NWs electrode has better conductivity and electrocatalytic properties. TiN NWs electrode exhibited better reversibility for V (Ⅱ) / V (Ⅲ) ions, and its electrode reaction resistance R ct was about 20 times and 10 times smaller than that of TiO 2 NWs and graphite electrode, respectively. At the same time, the rate constant of V (Ⅲ) reduction on TiN NWs electrode was 5.21 × 10 -4 cm · s -1, which was about 9.63 × 10 -5 cm -1 s ~ (-1), which is attributed to the one-dimensional nanowire microstructure of TiN NWs and its high electrocatalytic activity.