| As an inexhaustible renewable energy,solar energy is widely used in the fields of solar power generation and solar cells.However,there are some disadvantages such as dispersion,instability,low efficiency and high cost in the process of utilizing solar energy.Therefore,how to store and utilize solar energy efficiently and stably in a low-cost way has become a key research direction of energy utilization in recent years.With the deepening of research,molecular solar energy(MOST)system,a kind of solar energy storage method,comes into being.It plays an outstanding role in the field of solar energy storage and has a broad development prospect.Light responsive small molecule compounds can realize the storage and release of solar energy by using their own photoisomerism,and show excellent light responsiveness,high efficiency and fatigue resistance in this process.In a series of light-responsive small molecules,azobenzene compounds show excellent energy storage properties,so this kind of compounds are constantly expanded and extended in the field of research,and continue to open up the road for solar energy storage.In this paper,based on the excellent performance of photoisomeric molecules in the field of solar energy storage,we explore the energy storage characteristics of small photoisomeric molecules — naphthopyrane.In addition,based on the mature research results of azobenzene energy storage,two kinds of azobenzene energy storage materials were designed and synthesized,and they were systematically tested and studied.The main work contents include the following three parts:1.Solar energy storage MOF(ZIF-90-AAT)was synthesized by using2-formaldehyde imidazole,zinc acetate dihydrate and 2-amino-azo-toluene(AAT)as raw materials in a two-step process.The prepared ZIF-90-AAT not only has a good pore structure to enable AAT molecules to complete isomerization behavior,but also has good thermal stability and strong operability.The energy storage capacity was tested by inspection scanning calorimetry(DSC).The energy storage effect was 5.796J/g.As a new energy storage material,ZIF-90-AAT can not only be used for deicing applications,but also introduce MOF materials into the field of solar energy storage.In conclusion,this work provides a new idea for the research and exploration of energy storage materials and MOF materials.2.Based on the design idea of composite material,2-methacrylate6-[4-(4-methoxy-benzenazo)-phenoxy]-hexyl ester(MAHE)and PEG-2000 were combined by electrospinning to prepare a composite material for solar energy storage.Compared with the preparation methods of solar energy storage composite materials reported earlier,the preparation process of electrostatic spinning is simple and has good operability.The composite materials prepared by this technology maintain good phase transition and photoisomerism properties,and the energy storage capacity reaches 11.623 J/g.Moreover,the composite material shows good leakage resistance and fatigue resistance,which opens up a new way for the design and exploration of composite energy storage materials.3.Naphthopyran and its long chain derivatives were synthesized,and their structures were characterized by NMR hydrogen spectroscopy.The photoisomerism of naphthopyrane and its derivatives was investigated by UV-Vis spectrophotometry.The Gaussian theoretical calculation method provides a theoretical basis for the energy storage capacity of naphthol pyran and its derivatives.Thermogravimetric analysis(TGA)and inspection scanning calorimetry(DSC)were used to evaluate the thermal properties of naphthopyrane,and the heat storage behavior of naphthol pyrane was further investigated and judged by deicing experiments.It was found that naphthol pyran and its derivatives do have energy storage and release during photoisomerization. |
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