摘要
通过阳极氧化法在乙二醇电解液中制备TiO_2纳米管阵列,以钼酸钠和硫脲作为钼源和硫源,并添加半胱氨酸为辅助剂,水热法制备纳米花状二硫化钼修饰的TiO_2纳米管阵列。用X射线衍射仪、扫描电子显微镜、能谱仪和拉曼光谱对复合材料的晶型、形貌、物相等进行分析,通过电化学工作站测试复合材料的线性扫描伏安曲线、电化学阻抗谱和莫特–肖特基曲线。结果表明:MoS_2/TiO_2复合材料形貌比较规整均匀,MoS_2纳米花尺寸约为200nm;MoS_2与TiO_2复合有利于形成异质结,促进光生电子和空穴的分离;当钼酸钠浓度为0.8mmol/L时制备的复合材料光化学能转化率为纯氧化钛的2.89倍,达到了1.65%,而且复合材料的电荷转移电阻降低了约50%,光生载流子浓度提高了24倍,达到了3.38×10^(23)cm^(-3),具有非常优异的光电化学性能。
Well aligned TiO2 nanotube arrays were grown by anodization method on Ti foils in ethylene glycol electrolyte. Flowers-like molybdenum disulfide composed with nanoflakes was synthesized by hydrothermal process on TiO2 nanotube arrays, using sodium molybdate, thiourea and L-Cysteine as reactants. The obtained samples were analyzed by X-ray diffraction （XRD） and scanning electron microscope （SEM） equipped with energy dispersive X-ray detector. Linear sweeps voltammetry, electrochemical impedance spectroscopy and Mott-Schottky plots of samples were analyzed by electrochemical workstation. The results showed that a flowers-like MoS2 with diameter of c.a. 200 nm was synthesized, forming a heterojunction between TiO2 nanotube arrays and MoS2, which can effectively promote the separation of photogenerated charges, reduce the electron-hole recombination. Optimum concentration of sodium molybdate was obtained at 0.8 mmol/L, its corresponding photoconversion efficiency reached 1.65%, which was 2.89 times as high as that of pure TiO2, and the charge transfer resistance decreased ap- proximately 50%. The MoS2/TiO2 composite exhibited high cartier density of 3.38× 10^23 cm3, which was about 24 times higher than that of pure TiO2 nanotube arrays.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第11期1237-1241,共5页
Journal of Inorganic Materials
基金
国家自然科学基金(21476262)
青岛市科技发展计划(14-2-4-108-jch)
中央高校基本科研业务费(15CX05032A
14CX05038A)~~
关键词
阳极氧化
TIO2纳米管阵列
二硫化钼
水热法
anodization
TiO2 nanotube arrays
molybdenum disulfide
hydrothermal method
