The role of the transported entropy of lead ions in partially thermostatedand adiabatic cells

The Seebeck coefficient of a cell with lead electrodes and electrolyte of m olten lead chloride and alkali chloride is investigated experimentally and theoretically for mole fractions of PbCl2 between l and 0.3 in alkali chlor ides. An equation is derived from irreversible thermodynamics linking the t ransported entropy of lead ion to the chemical potential of the polarized l ead at the surface. The path across the cell is taken to be adiabatic in th is derivation. Experimental results indicate that the transported entropy o f lead ions depends on the radius of the alkali ion. (C) 2001 The Electroch emical Society.