All-Day Thermogalvanic Cells for Environmental Thermal Energy Harvesting
Performances of heating and cooling. (a) Increasing temperature curves of PPy/graphite and graphite under illumination with . The insets show the corresponding infrared (IR) thermal images at a steady state. (b) Steady-state temperature of PPy/graphite and graphite under different optical concentrations. (c) Net cooling power versus radiator temperature for PPy/graphite, graphite, a broadband radiator, and a selective radiator simulated by considering a nonradiative heat coefficient () of 6 W m-2 K-1 . (d) A 16-hour continuous temperature measurement of PPy/graphite, graphite, and ambient air from 16:00 (October 31, 2018) to 8:00 (November 1, 2018) at the Wuhan National Laboratory for Optoelectronics (WNLO), China (30°3049 N, 114°2513 E, 35 m altitude). The inset shows the ambient relative humidity fluctuation.