Hierarchically structured,Janus optical nanoengineered wastepaper for switchable radiative cooling/heating  

作　　者：Zifan Song Zipeng Zhang Xueting Zhang Jingyang Liu Wanjie Wang Jianfeng Wang Xiuxiu Jin 

机构地区：[1]Henan Eye Hospital,People's Hospital of Zhengzhou University,Henan Provincial People's Hospital,Zhengzhou,450003,China [2]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [3]Eye institute,Henan Academy of Innovations in Medical Science,Zhengzhou,China

出　　处：《Carbon Energy》2025年第1期174-187,共14页碳能源(英文)

基　　金：National Natural Science Foundation of China,Grant/Award Number:52003248;Henan Province Youth Health Science and Technology Innovation Talent Training Program,Grant/Award Number:YQRC2023007;Henan Province Excellent Youth Science Fund,Grant/Award Number:242300421064;Joint Fund Predominant Discipline Cultivation Project of Henan Province,Grant/Award Number:232301420036.

摘　　要：Switchable radiative cooling/heating holds great promise for mitigating the global energy and environmental crisis.Here,we reported a cost-effective,high-strength Janus film through surface optical engineering waste paper with one side decorated by a hydrophobic polymeric cooling coating consisting of micro/nanopore/particle hierarchical structure and the other side coated with hydrophilic MXene nanosheets for heating.The cooling surface demonstrates high solar reflectivity(96.3%)and infrared emissivity(95.5%),resulting in daytime/nighttime sub-ambient radiative cooling of 6℃/8℃with the theoretical cooling power of 100.6 and 138.5Wm^(−2),respectively.The heating surface exhibits high solar absorptivity(83.7%)and low infrared emissivity(15.2%),resulting in excellent radiative heating capacity for vehicle charging pile(~6.2℃)and solar heating performance.Impressively,the mechanical strength of Janus film increased greatly by 563%compared with that of pristine waste paper,which is helpful for its practical applications in various scenarios for switchable radiative thermal management through mechanical flipping.Energy-saving simulation results reveal that significant total energy savings of up to 32.4MJm^(−2) can be achieved annually(corresponding to the 12.4%saving ratio),showing the immense importance of reducing carbon footprint and promoting carbon neutrality.

关 键 词：hierarchical nano-micro structure high strength Janus optical nanoengineering switchable radiative cooling/heating 

分 类 号：TB34[一般工业技术—材料科学与工程]