Fig. 1
From: Aqueous thermogalvanic cells with a high Seebeck coefficient for low-grade heat harvest
TGC containing guanidinium in 0.4 M [Fe(CN)6]3−/[Fe(CN)6]4−. a The schematic operation mechanism for the TGC. b Dependence of the open-circuit voltage for the TGC systems on the temperature difference (ΔT) from 0 to 30 K; blank refers to the pristine [Fe(CN)6]3−/[Fe(CN)6]4− electrolytes without additives; GdmCl indicates the addition of guanidine chloride at the optimized concentration. c Dependence of the Seebeck coefficient on the concentration of GdmCl in the [Fe(CN)6]3−/[Fe(CN)6]4− electrolyte. d The Seebeck coefficients for TGCs containing different chaotropic species, including GdmCl, betaine (Bet), aminoguanidine chloride (AdmCl), and metformin chloride (MfmCl), and their corresponding optimized concentrations. e The chemical structure of four chaotropic species
