A CNT/TiO2-x Nx composite as a high electrocatalytic active counter electrode for a dye-sensitized solar cell
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摘要: 以钛酸异丙酯为钛源，CNTs为载体，结合水热和高温NH3处理技术成功制备了CNT/TiO2-xNx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/TiO2-xNx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TiO2-xNx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TiO2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。
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关键词:
- CNTs /
- CNT/TiO2-xNx复合物 /
- 对电极 /
- 染料敏化太阳能电池
Abstract: A CNT/TiO2-x Nx composite was synthesized by an integrated hydrothermal and NH3 annealing method. The as-synthesized composite was characterized by XRD, SEM, TEM and XPS, and its catalytic activity as a counter electrode for a dye-sensitized 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 TiO2-x Nx nanowires with a diameter of 3-8 nm, leading to a network structure. Benefiting from the high electrocatalytic activity of TiO2-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 electrode.-
Key words:
- CNTs /
- CNT/TiO2-xNxcomposites /
- Counter electrode /
- DSSC
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