fig4

Figure 4. Demonstration of GCTC powering electronic devices. (A) Photographs of a GCTC module containing 20 units of 0.5 M-GCTCs connected in series and the setup for electricity generation; (B) Real-time voltage of the GCTC module under a ΔT of 50 K; (C) Current-voltage curve and corresponding power output of the GCTC module at a ΔT of 50 K; (D-F) Various electronic devices directly powered by the GCTC module, including (D) an electrochromic smart window, (E) a green LED light, and (F) a thermohydrometer. GCTCs: GdnHCl-CH-co-regulated thermocell; LED: light-emitting diode.