The EpO2- diagram is very instructive for the selection of corrosion-resistant materials. In the molten hydroxide system, the equilibrium constant K1 of the reaction 2 OH- = H2O + O2- is one of the basic data for the EpO2- diagram. In order to obtain the constant K1, we determined the chemical potential of Na2O(μ°(Na2O)) dissolved in molten sodium hydroxide at 623 K (350°C) to be -4.71 × 105 J mol-1, by the use of the following cell: Na/beta-alumina/NaOH(Na2O)/ZrO2Y2O3/O2(Pt) K1 calculated from the above experimental data is then 1.0 × 10-10 atm.
|Number of pages||7|
|Journal||Journal of Electroanalytical Chemistry|
|Publication status||Published - Jul 10 1981|
ASJC Scopus subject areas
- Analytical Chemistry
- Chemical Engineering(all)