Study On Optimization Design And Radiation Characteristics Of MXene Microstructure Absorber

Energy is the world’s economic development and the important impetus to scientific and technological progress.Today’s non-renewable energy is still an important part of the current energy consumption structure,and the use of large quantity fossil fuels produces excess SO2 and CO2 gas emissions.The phenomenon such as the world’s average temperature rise is irreversible to human living environment.China is a big energy consumer,so it is extremely urgent to promote the reform of energy production and utilization mode and establish a clean and low-carbon energy system for a new era.Solar energy,as a safe and reliable renewable and clean energy without regional restrictions,has a broad application and development prospect due to its efficient and extensive utilization.The excellent electromagnetic wave absorption capacity and photothermal conversion characteristics of MXene materials as well as the special physical properties of micro-nanostructures can promote the efficient absorption of sunlight.However,there is a lack of research on micro-nanostructure design of MXene materials,and its absorption characteristics and mechanism are not clear.In this paper,the unique radiation characteristics of MXene materials are studied and analyzed,and the absorption mechanism of MXene after microstructure design is explored.First of all,the preliminary microstructure design of MXene is carried out,and it is found that the MXene absorber can show two characteristics of solar spectrum broadband absorption and selective absorption under different structures.A metal-dielectric(DMD-MDM)composite structure broadband absorber is designed for applications such as solar seawater desalination that require broadband absorption.Under the condition that the electromagnetic wave is TM polarization positive incidence,the absorptivity and electromagnetic field distribution are simulated and calculated.It is found that the average absorptivity of the absorber reaches 95% in the band of 0.5-2.5 μm.The broadband absorption is due to the excitation of absorption effects such as cavity resonance,surface plasmon polarization,local surface plasmon resonance and gap surface plasmon resonance at different wavelengths.By studying the change of absorptivity with the change of structural parameters and incident angle,it is found that the absorber still has high absorption performance at 80°incident angle.The selective emitter / absorber of solar TPV system is further designed and optimized,and the MXene film-Cu microcavity selective absorber is designed.The changing trend of absorptivity with different structural parameters is compared and analyzed,and the optimization range of structural parameters is determined.The Ga Sb TPV system is optimized by using multi-island genetic algorithm,and the absorption performance of the absorber under the optimal parameters is calculated.The results show that the average absorptivity is 89.3% in the band of 0.3-1.72 μm and 15.1% in the band of 1.72-3 μm.The absorber shows good selective absorption characteristics.The coupling of local surface plasmon resonance,surface plasmon polarization and microcavity resonance is the main reason for the high absorption before the cutoff wavelength.In addition,the absorption characteristics of the absorber at different incident angles and polarization angles are also investigated.The results show that the absorber can maintain high absorptivity and selective absorption characteristics at large incident angles,and has excellent polarization independence.