论文部分内容阅读
应用光谱电化学方法测定了纳米晶TiO2电极在不同浓度的4-叔丁基吡啶(TBP)电解液中的平带电势(Efb).TBP对纳米晶TiO2电极的能带结构具有显著的影响.在不含和含有0.2或0.4 mol.L-1TBP的0.2 mol.L-1高氯酸四丁基铵(TBAP)/乙腈溶液中,TiO2电极的Efb依次为-2.25,-2.46和-2.60 V.当加入Li+后,TiO2电极的Efb正移.在不含和含有0.2或0.4 mol.L-1TBP的0.2 mol.L-1 LiClO4/乙腈溶液中,TiO2电极的Efb依次为-1.12,-1.22和-1.30 V.用时间分辨电流方法测定了陷阱态分布,在不含和含有0.2或0.4 mol.L-1TBP的0.2 mol.L-1 TBAP/乙腈溶液中,TiO2电极的陷阱态密度依次为3.52×1016,3.18×1016和3.37×1016 cm-2,陷阱态分布的最大值分别位于-1.99,-1.89和-1.85 V处.Li+的加入进一步减少了陷阱态密度.在不含和含有0.2或0.4 mol.L-1TBP的0.2 mol.L-1 LiClO4/乙腈溶液中,TiO2电极的陷阱态密度依次为8.39×1015,1.11×1016和9.22×1015cm-2,陷阱态分布的最大值分别位于-0.72,-0.84和-0.95 V处.最后,研究了N3染料敏化的纳米晶TiO2电极在含有不同浓度TBP的电解质溶液中的光电化学性质.结果显示,随着TBP浓度的增加,Voc增大,使TiO2电极的光电转化效率增加.
The electrospinning potential (Efb) of nanocrystalline TiO2 electrodes in different concentrations of 4-tert-butylpyridine (TBP) electrolyte was determined by the spectrochemical method.TBP has a significant effect on the band structure of nanocrystalline TiO2 electrodes. The Efb of TiO2 electrode was -2.25, -2.46 and -2.60 V, respectively, in 0.2 mol·L-1 TBAP / acetonitrile solution without and with 0.2 or 0.4 mol·L-1TBP .The Efb of the TiO2 electrode moves forward when Li + is added.In the solution of 0.2 mol.L-1 LiClO4 / acetonitrile without or with 0.2 or 0.4 mol.L-1TBP, the Efb of the TiO2 electrode is -1.12, -1.22 And -1.30 V. The trap state distribution was determined by the time-resolved current method. In 0.2 mol.L-1 TBAP / acetonitrile solution without or with 0.2 or 0.4 mol.L-1TBP, the trap state density of TiO2 electrodes was 3.52 × 1016, 3.18 × 1016 and 3.37 × 1016 cm-2, respectively, and the maximum trap state distribution is located at -1.99, -1.89 and -1.85 V. The addition of Li + further reduces the trap state density in the absence of and containing 0.2 Or 0.4 mol.L-1TBP in 0.2 mol.L-1 LiClO4 / acetonitrile solution, the trapped states of TiO2 electrodes were 8.39 × 1015, 1.11 × 1016 and 9.22 × 1015cm-2, respectively, and the maximum trapped states were located at - 0.72, -0.84 and -0.95 V. Finally, the photoelectrochemical properties of N3 dye-sensitized nanocrystalline TiO2 electrodes in electrolyte solution containing different concentrations of TBP were studied.The results showed that with the increase of TBP concentration, Voc increased , So that the photoelectric conversion efficiency of TiO2 electrode increased.