阳极氧化法制备TiO_2纳米管及其电池性能研究

Preparation and Battery Performance of Titanium Oxide Nanotube Arrays Films by Anodic Oxidation Method

采用阳极氧化法制备TiO2纳米管,并将所制备的TiO2纳米管用作染料敏化太阳能电池光阳极。研究了氧化时间,电解质浓度,水含量和表面处理对纳米管及电池性能的影响。结果表明:随氧化时间的增加,纳米管的长度和直径增加。氧化时间为7 h时,纳米管的长度和直径分别为550 nm和40 nm,当氧化时间为50 h,纳米管的长度和直径分别为2.41μm和70 nm。电解质NH4F浓度从0.25wt%,0.5wt%增加到1wt%时,纳米管的长度先增后降,直径基本不变,当NH4F浓度为1wt%时,其长度为1.50μm,直径50 nm左右,并且纳米管表面部分被腐蚀。水含量为0时纳米管长度1.60μm,直径25 nm;当含水1%时纳米管长度1.90μm,直径50 nm;但水含量增加到3%时,其长度却降至973 nm,直径50 nm。用长和直径分别为2.60μm和70 nm纳米管制备成染料敏化太阳能电池,其光电转化效率为2.45%。

TiO2nanotube prepared by anodic oxidation method was used as photoanode of dye-sensitized solar cell（DSSC）. The effects of oxidation time,electrolyte concentration and water content on the nanotube and performance of DSSC were studied. The results show that the length and diameter of the nanotube increased as the oxidation time increasing. When the oxidation time was 7 h,the length and diameter of the nanotube were550 nm and 40 nm,respectively. When the oxidation time was 50 h,the length and diameter of the nanotube were 2. 41 μm and 70 nm,respectively. The length of the nanotube initially increased and then decreased meanwhile the diameter remained relatively unchanged,when the concentration of NH4 F in the electrolyte were 0. 25wt%,0. 5wt% and 1wt%. The length of the nanotube increased from 1. 8 μm to 2. 60 μm and the diameter increased from 45 nm to 60 nm with the electrolyte content increased from 0. 25wt% to 0. 5wt%.However,the length of the nanotube decreased to 1. 50 μm and the diameter remain about 50 nm when the electrolyte content was 1wt%. Additionally,the surface of the nanotube was partly corroded. When the water content were 0%,1% and 3%,the length of the nanotube were 1. 60 μm,1. 90 μm and 973 nm,respectively; the diameter of the nanotube were 25 nm,50 nm and 50 nm,respectively. The DSSC fabricated by the nanotube of length of 2. 60 μm and diameter of 70 nm show a power conversion efficiency of 2. 45%.