| 초록 |
The ionic activity of the electrolyte is essential in the description of the cell voltage in fuel cells. We investigate the ionic activity of the electrolyte by adopting the sticky-point model. The Helmholtz energy is derived through the r-particle cavity-correlation function(CCF) for chains of sticky and charged hard spheres. The r-CCF is approximated by a product of effective nearest-neighbor two-particle CCFs; these are determined from the hypernetted-chain and mean-sperical closures(HNC/MSA) inside and outside the hard core, respectively, for the integral equation theory for electrolytes. Osmotic pressures, osmotic coefficients, and activity coefficients are calculated for model solutions with various chain lengths. In this study, we develop the ionic activity model based on the thermodynamic framework introducing both chain contribution and sticky contribution. We calculate the cell voltage with determined ionic activity model.
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