Department of Materials Science and Engineering , National University of Singapore , 9 Engineering Drive 1 , 117574 Singapore.
ACS Appl Mater Interfaces. 2019 Oct 23;11(42):38674-38682. doi: 10.1021/acsami.9b12156. Epub 2019 Oct 9.
Many exciting developments have unfolded on the recently emerged research topic of solar-driven interfacial evaporation, which is a promising technology for water purification. However, the sole heat source, i.e., solar energy, has put a limit on the maximum achievable evaporation rate. Therefore, to boost the evaporation beyond the limit, we here in this work have put forth a new photothermal system with a trilayered structure (TLS) that is capable of simultaneously harvesting hybrid energy in addition to solar energy for enhanced evaporation. A carbon-based material with broad-band light absorption that can be facilely synthesized through dehydration effect is also reported. Demonstrations of TLS evaporator by recovering the free thermal energy from sources like ground surficial heat and waste heat from laboratory facility and building walls together with solar radiation have been carried out. A remarkable synergic evaporation rate exceeding 2.4 kg m h is achieved, and moreover, the hybrid heating makes evaporation independent of solar intermittency. Besides, a TLS integrated hybrid water-purification bottle with outstanding portability is further demonstrated, which is expected to be of great significance to the development of mobile water purification and safe water security in the future.
在最近出现的太阳能驱动界面蒸发这一研究课题上，已经有了许多令人兴奋的进展，这是一种很有前途的水净化技术。然而，单一的热源，即太阳能，限制了最大可能的蒸发率。因此，为了将蒸发率提高到极限以上，我们在这项工作中提出了一种具有三层结构（TLS）的新型光热系统，该系统除了太阳能之外，还能够同时收集混合能量以增强蒸发。还报道了一种可以通过脱水效应简便合成的具有宽带光吸收的碳基材料。通过从地面表层热和实验室设施以及建筑物墙壁中的废热等来源回收自由热能，与太阳能辐射一起，对 TLS 蒸发器进行了演示。实现了超过 2.4kg·m-2·h-1 的协同蒸发率，而且，混合加热使蒸发不再依赖于太阳能的间歇性。此外，还进一步演示了一种具有出色便携性的 TLS 集成混合水净化瓶，有望对未来移动水净化和安全水安全的发展具有重要意义。
