Charging-free thermally regenerative electrochemical cycles with high temperature coefficients for heat-to-electricity conversion

Based on CuNiCoHCF and Fe(ClO 4 ) 2/3 , a series of charging-free TRECs with a high temperature coefficient of −2.2 to −2.52 mV K −1 are developed, and the performance of the charging-free TRECs is enhanced by a low-polarization operation strategy.