Research On Construction And Performance Of Flexible Paper-based Moisture And Heat Power Generation Devices

China has clearly put forward the strategic goal of reaching the carbon peak in 2030 and achieving carbon neutrality in 2060.The development of sustainable clean energy has important practical significance and strategic value for China to achieve low carbon economy and carbon neutrality.The complex and changeable natural and industrial environment is often difficult to carry out a single energy conversion,it is likely that there are multiple energy conversion mechanisms at the same time.Therefore,relying on moisture and industrial waste heat widely existing in nature to capture energy has attracted extensive attention from researchers at home and abroad,and has become the forefront and hot spot in the field of clean energy research.Therefore,in this paper,using flexible paper material with hierarchical porous structure as the substrate,using inorganic bismuth telluride(Bi₂Te₃),PEDOT:PSS,glycerol,carbon nanotubes and other materials as raw materials,the flexible wet thermal power device was prepared by screen printing.Specific research contents are as follows:(1)Taking full advantage of the thermoelectric material advantages of inorganic semiconductor Bi₂Te₃ and organic semiconductor PEDOT:PSS,we doped carbon nanotubes to improve the electronic conductivity of PEDOT:PSS.At the same time,glycerin was added as the functional imprimator of PEDOT:PSS,and the hygroscopic performance was significantly improved to prepare wet and thermal conductive ink.The wet thermal power generation device was prepared by using screen printing technology and coated on paper based material.The results show that compared with glass and PET film substrates,porous paper with excellent thermal insulation(such as filter paper)as paper substrates can obtain excellent wet-heat power generation performance,as well as good flexibility and folding resistance.(2)N type and P type humid thermal conductive ink are coated with screen printing method on paper substrate to print P pole leg and N pole leg,and silver plasma is used as electrode material to make moisture power generation device,which can obtain excellent moisture power generation performance.It is found that the performance of the moisture power generation device is not affected by the light intensity and the ambient temperature of the device,and the performance is improved with the increase of the number of hybrid devices.When the four device units are mixed together,the device produces a short-circuit voltage of 600m V at 95%Rh humidity,which can meet the personalized requirements of the voltage of the small sensor.In addition,different bending degrees almost have no effect on the performance of moisture power generation,which further expands the scope of its use,which provides a new scheme for converting moisture into electricity resources.(3)The P-N leg of the moisture power generation device is folded in half along the centerline into a 60°Angle,and the P-N leg is fixed on the cardboard to prepare a"triangle"corrugated temperature difference power generation device.It is found that the excellent open-circuit output voltage of 217m V can be obtained under the conditions of absolute temperature difference of 50K(?T=50K)and constant humidity(RH=50-60%).When the humidity is 95%RH and the absolute temperature difference is 50K,the generation voltage of the device can reach 728m V,and its performance improves with the increase of p-N number.In 95%RH humidity environment,sustainable power generation for more than 24 hours,stable voltage in 500m V.(4)Through the analysis of the wet-heat power generation process,it is considered that when the device is affected by the temperature difference,the electrons and holes generated by the inorganic semiconductor Bi₂Te₃ and the organic semiconductor PEDOT in the P and N pole legs of the device will move from the hot end to the cold end,resulting in the Seebec effect and forming the electron-driven potential difference;On the other hand,PSS/glycerol will ionize and release H⁺and migrate from hot end to cold end,which will also produce Seebeck effect and form the potential difference generated by ion drive.At the same time,PSS/glycerol will ionize and release enough H⁺in the humid environment,and the ions will migrate and form a new double-layer structure near the electrode,so that the ion diffusion drives the potential difference.In the process of power generation driven by humid and hot environment,the two mechanisms cooperate to construct the mechanism of this humid and hot power generation.