The single electrode peltier heats of Li⁺/Li, H ₂/H^- and Li⁺/Pd-Li couples in molten LiCl-KCl systems

The thermoelectric power of the Li⁺/Li couple was measured in a LiCl-KCl eutectic melt at 633-773 K. The obtained value, 0.089 mV K ^-1, gives the single electrode Peltier heat for the reaction Li ⁺+e^- ⇌ Li as - 5.8 kJ F^-1 at 673 K (endothermic cathodic reaction). The single electrode Peltier heat for the reaction 1/2 H₂ + e^- ⇌ H^- in a molten LiCl-KCl-LiH system has been calculated using the temperature dependence of the equilibrium potential of the H₂/H^- couple measured with reference to the Li⁺/Li potential, which gives 5.8 kJ F^-1 (exothermic cathodic reaction) under the condition of hydrogen pressure of 1.0 atm, H^- ion concentration of 0.01 (anion fraction) and 673 K. The single electrode Peltier heats for formation of Pd-Li alloys have been also evaluated.