Designing n-Type Thermogalvanic TEMPO-Substituted Polyacrylamide via Conformational Entropic Modulation.

ABSTRACT: This work pioneers the use of TEMPO-substituted polyacrylamide (PTAm) for n-type thermogalvanic (TG) systems, uniquely harnessing redox-induced conformational entropy changes to enhance the thermoelectric performance. Through the electrochemical oxidation of low-molecular-weight PTAm, which is initially water-insoluble, a water-soluble polyelectrolyte (ox-PTAm) is formed, containing both TEMPO and oxoammonium species, as indicated by cyclic voltammetry. The redox transitions induce conformational entropy changes, which are corroborated by electrochemical and thermoelectric measurements, leading to an observed n-type thermopower (α) of -0.76 mV K^-1. A maximum power output of 1.18 mW m^-2 K^-2 is achieved under a thermal gradient of 3.8 K. This work highlights

SUBMITTER: Hsu CC 

PROVIDER: S-EPMC12918710 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature