Researchers from Nanjing University in China have developed a new device of 3D hollow-cone structure based on a graphene oxide film that can greatly increase the solar-thermal conversion efficiency.
The device, named 'Artificial Transpiration', is inspired by the transpiration process of trees. It has a special 1D water path within it, which can reduce the energy loss in conduction. The cone structure can reportedly collect more sunlight throughout the day when compared to a flat device, as about 10-50% of sunlight is diffusive. Thus it performs even better in the real world than in the laboratory, the team said.