Preparation Of Phthalocyanine/Polyoxometalate Multilayer Electrode And Photoelectric Properties Research

From steam to electricity until the development of nuclear energy, the innovation of energy utilization technology plays a role in driving the progress of human society and boosting the social development. Since the 16 th century, as human beings make a large-scale use of the non-renewable energy sources such as fossil fuels etc, but also created an enormous pollution on the natural environment. And this forces people to the development and utilization of solar energy, which as the representative of clean, renewable energy.1. To investigate the influence on the photovoltage of the photoanode incorporated by saturated and lacunary polyoxometalates, the multilayer composite film photoanodes consisting of organic phthalocyanine(Cu Pc) and inorganic polyoxometalates(saturated PMo12 and lacunary PMo11) were fabricated using the layer-by-layer(Lb L) self-assembly method in aqueous solution. The rational combination of electron acceptor polyoxometalates with electron donor phthalocyanine could promote exciton dissociation and charge transport in the photoanode of organic solar cell. By measurements of photocurrent transient and current-voltage curves on the film electrodes, the nanocomposite films of(PMo11/Cu Pc/PSS/PAH)6 exhibit higher photocurrent and power conversion efficiency than that of(PMo12/Cu Pc/PSS/PAH)6, suggesting that PMo11 is superior in the abilities of electron capture and transfer to PMo12. The action mechanism of the polyoxometalates was revealed by analysis of the fluorescence emission spectra.2. For investigate the photoelectrocatalytic and gas sensing performance of Cu Pc/POM film, the phthalocyanine(Cu Pc) and polyoxometalate(POM) was fabricated by using the layer-by-layer(Lb L) self-assembly method, which shows excellent photoelectrocatalytic and photovoltaic performance. The results show that compared to the single component POM or Cu Pc film, the(PMo12/Cu Pc)6 composite film exhibits enhanced photoelectrocatalytic performance for the oxidation of ascorbic acid at biological p H(p H 7.0). This work inspires us the POM-based photoelectroactive organic/inorganic composite film can be potentially used for practical applications in photoelectrochemical sensors and solar cells.3. To investigate the influence on photovoltage of the photoanode caused by the morphology, we use hydrothermal synthesis method to fabricate the uniform size Ti O2 nanorod array on FTO substrate and fabricate the Ti O2nanorod/POM/Cu Pc composite film photoanode. The photovoltage test show that compared to the Ti O2nanorod/Cu Pc film, the Ti O2nanorod/POM/Cu Pc composite film exhibits enhanced photovoltage performance because the POM could act as electron-acceptor to retard the electron–hole recombination and the excited electron can transport along the Ti O2 nanorod. Thus, the photovoltage performance of Cu Pc/POM film can be enhanced by morphology control, and this provide a new idea in the photovoltage applications of Cu Pc/POM composite film.