Temperature switch of electrochemical Seebeck coefficient of Fe/Fe formation of [FeCl]/[FeCl].

The electrochemical Seebeck coefficient ( = d/d; and are the redox potential and temperature, respectively) is important parameter for thermoelectric conversion. Here, we found that of Fe/Fe in dimethyl sulfoxide (DMSO) with small amount of 19 M LiCl aqueous solution exhibits a crossover behavior from 1.4 mV K (20 °C ≤ ≤ 40 °C) to ≈0 mV K (50 °C ≤ ≤ 80 °C).

Control of Fe coordination by excess Cl in alcohol solutions.

We spectroscopically investigated coordination state of Fe in methanol (MeOH) and ethanol (EtOH) solutions against Cl concentration ([Cl]). In both the system, we observed characteristic absorption bands due to the FeCl complex at high-[Cl] region. In the MeOH system, the proportion () of [FeCl] exhibits a stationary value of 0.