Shengzhong Li,Shuangyu Zhang,Shu Mei,Xiangfei Kong,Miao Yang,Wenjun Wu,Shuhua Zhang,Haijun Tan
A novel porphyrin dye T-2 with phenoxazine (POZ) as donor unit has been synthesized and utilized for dye-sensitized solar cells (DSSC). Compare with porphyrin dye T-1 (in which triphenylamine as a donor unit), the DSSC based on T-2 exhibited a significantly higher J sc (16.35 mA cm −2 ) and V oc (670 mV) than that of T-1 (9.13 mA cm −2 , 610 mV), which attribute to the higher IPCE and τ of the device based on T-2 . Correspondingly, the T-2-based device achieved a photoelectric conversion efficiency (PCE) of 7.64% (N719, 8.45%). By detailed investigation of the relationship between structure and performance, we found the butterfly-shaped structure, stronger electron-donating capability, and the extra alkyl chain of POZ are the main reasons leading to better performance of T-2 than that of T-1 in the DSSC device.
This study developed a novel colorimetric sensor array (CSA) based on mesoporous silica nanospheres (MSNs) for the quantitative detection of aflatoxin B1 (AFB1) in wheat. First, 12 kinds of nano-composite color-sensitive materials (Nano-CSMs) were prepared based on MSNs combined with metal porphyrin dyes, and their color-sensitive materials (CSMs) were modified. The volatile gas information of wheat samples with different degrees of mold was collected using two different sensor arrays, and the characteristic maps were visualized. Next, the genetic algorithm (GA) and particle swarm optimization (PSO) were used to screen the optimal characteristic components, and a support vector regression (SVR) model was established to achieve rapid quantitative detection of AFB1. The optimization results show that the SVR model based on Nano-CSA performed best, with a correlation coefficient ( R p ) of 0.9754. The results show that the colorimetric sensor array modified by MSNSs has higher sensitivity and efficiency in the detection of AFB1 in wheat.
Two donor–π-spacer–acceptor porphyrin dyes were synthesized for use in dye-sensitized solar cells. The dyes comprised the same donor (porphyrin derivative) consisting of 3,4,5-trimethoxybenzaldehyde and acceptor/anchoring group (carboxyl group) but varying π-spacer consisting of a Schiff base structure. Each of the dyes displayed different adsorption behavior and coverage on the TiO 2 surface. The porphyrin dyes P Zn BIA COOH studied in this work exhibit red-shifted and broadened electronic spectra respect to the reference P Zn COOH as expected. By the introduction of Schiff base unit at the meso positions, the energy level of E ox (excited-state oxidation potentials) is significantly shifted to the positive compared with the reference P Zn COOH, indicating a decreased HOMO–LUMO gap. The highest power conversion efficiency of the two dyes based on DSSCs reached 1.75% under AM 1.5 G irradiation.
Chunping Xiao,Lili Ji,Dehui Li,Louqun Wang,Jing Yang
Photoelectrochemical biofuel cells can convert light and chemical energy into electrical energy using a dye-sensitized titania (TiO2) fluorine-doped tin oxide photoanode and a platinum-coated fluorine-doped tin oxide cathode. TiO2 of the photoanode serves both as a support for dyes and as an electron-transporting medium, the structure of which can limit electron trapping and charge transporting and then affect the performance of the photoelectrochemical biofuel cells. TiO2 nanotube array films have been shown to enhance the efficiencies of both charge collection and electron injection, and hence a vertically aligned TiO2 nanotube array is investigated as a conductor for the tetrakis(4-carboxyphenyl)porphyrin dye to construct a new two-compartment photoelectrochemical biofuel cell. The photoelectrochemical biofuel cell containing the TiO2 nanotube array photoanode yields a short-circuit (Isc) current of 110 μA and an open-circuit (Voc) potential of 1010 mV. In contrast, the photovoltaic parameters, Isc and Voc of the photoelectrochemical biofuel cell with the mesoporous TiO2 nanocrystal fluorine-doped tin oxide photoanode, are 96.96 μA and 740 mV, respectively. Photovoltaic measurements show that the maximum incident photon-to-collected electron conversion efficiency was 58% at 430 nm through the spectral range (400–800 nm) for the photoelectrochemical biofuel cell with the TiO2 nanotube array fluorine-doped tin oxide photoanode. These results revealed that the TiO2 nanotube array had great potential for the photoelectrochemical biofuel cells.
危险品化学品经营许可证（带存储）