Solar energy is the main cause of overheating in the cabin of cars on summer days,resulting in a large amount of fossil energy being used for temperature control in cars.However,the conversion of solar energy in a low...Solar energy is the main cause of overheating in the cabin of cars on summer days,resulting in a large amount of fossil energy being used for temperature control in cars.However,the conversion of solar energy in a low-energy way to realize in-vehicle temperature controlling and reduce the consumption of fossil fuels remains a significant challenge.Herein,we report a roomtemperature self-healing polyurethane(PU2)with excellent mechanical strength(10.4 MPa)to fabricate an energy conversion and supply composite(ST1/PU2)via combining with phase change microcapsules(MEPCMs),which efficiently realize invehicle temperature controlling.MEPCMs display superior phase transition enthalpy of 160.0 J/g,thermal conductivity 0.34 W/(m K)and encapsulation performance(71.9%)in ST1/PU2.The resultant ST1/PU2 exhibits outstanding cooling effect/thermal insulation upon a light intensity of 5.1 W/cm^(2),where the actual temperature was reduced by 28.5℃compared to PU2.Furthermore,the self-healing triboelectric nanogenerator(S-TENG)based on ST1/PU2 provides continuous electrical signals and the healed S-TENG could be 100%recovered at 50℃in 24 h,which shows great potential to significantly prolong the service life of devices.Consequently,this work will provide a new strategy to reduce the fossil energy consumption and promote the sustainability of flexible electronics.展开更多
基金supported by the National Key Research and Development Program of China(2021YFC2101800)the National Natural Science Foundation of China(52173117,52473004,52073049)+3 种基金the Natural Science Foundation of Shanghai(22ZR1400700)the Shanghai Rising-Star Program(21QA1400200)the Science and Technology Commission of Shanghai Municipality(20DZ2254900)the Fundamental Research Funds for the Central Universities(2232024G-12)。
文摘Solar energy is the main cause of overheating in the cabin of cars on summer days,resulting in a large amount of fossil energy being used for temperature control in cars.However,the conversion of solar energy in a low-energy way to realize in-vehicle temperature controlling and reduce the consumption of fossil fuels remains a significant challenge.Herein,we report a roomtemperature self-healing polyurethane(PU2)with excellent mechanical strength(10.4 MPa)to fabricate an energy conversion and supply composite(ST1/PU2)via combining with phase change microcapsules(MEPCMs),which efficiently realize invehicle temperature controlling.MEPCMs display superior phase transition enthalpy of 160.0 J/g,thermal conductivity 0.34 W/(m K)and encapsulation performance(71.9%)in ST1/PU2.The resultant ST1/PU2 exhibits outstanding cooling effect/thermal insulation upon a light intensity of 5.1 W/cm^(2),where the actual temperature was reduced by 28.5℃compared to PU2.Furthermore,the self-healing triboelectric nanogenerator(S-TENG)based on ST1/PU2 provides continuous electrical signals and the healed S-TENG could be 100%recovered at 50℃in 24 h,which shows great potential to significantly prolong the service life of devices.Consequently,this work will provide a new strategy to reduce the fossil energy consumption and promote the sustainability of flexible electronics.
