Directional thermal management is critical for energy harvesting and the common passive radiative cooling and heating strategies free of electricity input focus on regulating the solar and thermal radiation properties of materials but neglect the thermal conduction process. Here, the authors report dual Janus foams with dual asymmetries in photothermal and thermal rectification showing high photothermal property contrast and thermal rectification ratios.
- Chao Jiang
- Xingmei He
- Fuxin Liang