Solar-to-thermal conversion testing of PVDF-PW@PPy. (a) Absorbance of the composite film. (b) Schematic diagram of the solar-to-thermal conversion testing device. (c) Temperature curves of PVDF-PW@PPy under different light intensities. (d) Partial infrared thermal imaging during testing. (e) Temperature curves under 1.0 and 2.0 sun light intensities. (f) Maximum temperature and temperature difference under different test conditions. (g) Solar-to-thermal conversion efficiency under different light intensities. (h) Temperature curves of the composite film under ten continuous photothermal conversion tests. (i) Solar-to-thermal conversion mechanism.