中文摘要：

以钛酸异丙酯为钛源,CNTs为载体,结合水热和高温NH_3处理技术成功制备了CNT/TiO_（2-x）N_x复合物,并研究了其作为染料敏化太阳能电池（DSSC）对电极材料的电催化性能。采用X射线衍射、扫描电镜、透射电镜、X射线光电子能谱和循环伏安等表征手段对CNT/TiO_（2-x）N_x复合物的形貌、结构和电化学性能进行表征。结果表明：直径30~50 nm的CNTs和直径为3~8 nm的TiO_（2-x）N_x纳米线相互交联形成了三维的网状结构,这一结构有利于增大复合物与电解液的接触面积。复合物融合了N掺杂Ti O2的高电催化活性和CNTs的高导电性的优势使得复合物的光电效率高达7.16%,与贵金属催化剂Pt相当,有望成为DSSC对电极材料理想替代材料之一。

英文摘要：

A CNT/TiO2 -x Nx composite was synthesized by an integrated hydrothermal and NH3 annealing method. The as-synthe-sized composite was characterized by XRD, SEM,TEM and XPS,and its catalytic activity as a counter electrode for a dye-sensi-tized solar cell （DSSC） was investigated by cyclic voltammetry, Tafel-polarization,electrochemical impedance spectroscopy and I-V techniques. Results show that nitrogen was successfully doped into the TiO2 crystal lattice. CNTs with a diameter of 30-50 nm interconnect with the TiO 2- x Nx nanowires with a diameter of 3-8 nm,leading to a network structure. Benefiting from the high elec-trocatalytic activity of TiO 2 -x Nx and the high conductivity of CNTs,the composite demonstrates a higher power conversion efficiency （7.16% ） than pure CNTs （4. 67% ） as the counter electrode of the DSSC,and this value is comparable to that of a noble Pt elec-trode.