Electron transfer phase transition and oxidization process in NaCoMn[Fe(CN)] (0.00 ≤ ≤ 1.60).

We investigated the phase diagram of NaCoMn[Fe(CN)] in the entire Na concentration range of 0.00 ≤ ≤ 1.60.

Energy harvesting thermocell with use of phase transition.

A thermocell that consists of cathode and anode materials with different temperature coefficients (α = dV/dT) of the redox potential (V) can convert environmental thermal energy to electric energy via the so-called thermal charging effect. The output voltage V of the current thermocell, however, is still low (several tens mV) and depends on temperature, which are serious drawbacks for practical use of the device as an independent power supply. Here, we report that usage of phase transition material as electrode qualitatively improve the device performance.

The effect of 3d-electron configuration entropy on the temperature coefficient of redox potential in CoMn Prussian blue analogues.

Recently, it was reported that a thermocell can convert temperature into electrical energy by using the difference in the thermal coefficient (α ≡ dV/dT) of the redox potential (V) between the cathode and anode materials. Here, we systematically investigated α of NaxCo1-zMnz[Fe(CN)6]y (Co1-zMnz-PBA) against Mn concentration (z). The z-dependence of α is interpreted in terms of the 3d-electron configuration entropy (ΔS3d) of the redox site.