Aqueous thermogalvanic cells with a high Seebeck coefficient for low-grade heat harvest.

ABSTRACT: Thermogalvanic cells offer a cheap, flexible and scalable route for directly converting heat into electricity. However, achieving a high output voltage and power performance simultaneously from low-grade thermal energy remains challenging. Here, we introduce strong chaotropic cations (guanidinium) and highly soluble amide derivatives (urea) into aqueous ferri/ferrocyanide ([Fe(CN)₆]^4-/[Fe(CN)₆]^3-) electrolytes to significantly boost their thermopowers. The corresponding Seebeck coefficient and temperature-insensitive power density simultaneously increase from 1.4 to 4.2 mV K^-1 and from 0.4 to 1.1 mW K^-2 m^-2, respectively. The results reveal that guanidinium and urea synergistically enlarge the entropy difference o

SUBMITTER: Duan J 

PROVIDER: S-EPMC6279834 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature