The CA data in Fig. show that the ASPIRE device performs stable and consistent electrochemical reactions during oxidation and reduction cycles. This yields an IR emissivity tunability (Δε) of 0.195, which is defined as the difference between the high-and low-emissivity states, using weight-averaged emissivity calculated based on blackbody radiation at a typical human skin temperature (34 °C). The emissivity changes of the ASPIRE device can also be visualized by IR thermal images, as shown in Fig. and Fig. . The thermal images of the of the device has a 6.1 ℃ temperature difference (39.2 °C -33.1 °C) solely because of the emissivity changes, demonstrating its excellent capability for thermoregulation applications.