Diffusion, Seebeck and Conductivity of Spin Crossover Complexes Towards Thermoelectric Power Generation

Development of Seebeck generation from heat requires understanding of the behavior of electrochemical properties as a function of temperature. This study performs cyclic voltammetry of octahedral iron, manganese, and cobalt spin-crossover materials to relate the electrochemical properties of the spincrossover complex with the Seebeck performance. The diffusion coefficient, which is determined by cyclic voltammetry, determines the magnitude and sign of the Seebeck coefficient. From the results, the higher Seebeck iron complex in 3-Methoxypropionitrile solvent compared to the iron complex in Dimethyl sulfoxide solvent, is due to its high diffusion ratio, high total diffusion and high conductivity. Thus, this study shows that, the selectivity of transition metal type for spin crossover material and solvent affects Seebeck coefficient significantly by the diffusion that is extracted from cyclic voltammetry analysis.