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The total current 1S glven by I = f(J+ + J_). For different values of total current, the solution parameters rand s can be calculated by nu- mer1cal methods and, together with other parameter values such as appl1ed pressure and applied f1eld, allow the fluxes of the proton, chloride ion, and water to be calculated. One can see that the total volume flux depends on membrane charge den- sity and thickness. As those parameters change, the total volume flux will change. Status. - Measurements were made w1th static d1ffusion cells to arrive at values of concentrat1ons that would minim1ze the osmot1c pressure d1f- ference between 1nitially uncharged solutions. These results are shown in f1gure 18, where the ord1nate represents a term proportional to the volume flux. For init1ally d1scharged solutions with 1.0 NHC1, osmotic equilibrium occurs somewhere between the comb1nat1ons 1.0 MFeC12/1.0 MCrC13 and 1.2 MFeC12/0.8 MCrC13. Summary. - The comb1nation of\salt and acid concentrations that gives isoton1c Solut1ons for 1nit1ally d1scharged reactants has been determ1ned exper1mentally. However, such solutions in a stack of cells being cycled do not prevent a net transfer of solvent to the chrom1um system. The forego1ng analyses show that several factors can contribute to the phenomenon. Among these are the transport numbers for the ion1c spec1es and water, membrane charge density, th1ckness, and permeab1lity, and diffus10n coeff1cients. Addit10nal experimentat10n plus further ref1nements in the analytical ap- proach will be used to quantify the relative contributions of the various factors. This will direct the development effort for a techn1que to counter the fluid transfer. Figure 19 displays the major milestones associated with this activ1ty. Electrode Development Giner, Inc. Background. - G1ner, Inc., performed screening studies of var10US Redox couples and electrode materials during 1975 and 1976 under contract NAS3-19760. E1ght Redox couples were experimentally exam1ned for electro- chem1cal activ1ty. The solub1l1ty, ViSCOS1ty, and conductivity of the1r var10US aqueous Solut1ons were also measured. Four of the most promising couples, 1nclud1ng 1ron and chromium, were tested w1th var10US electro- catalysts. Four Redox cell des1gns were also invest1gated. During 1977 and 1978, under contract NAS3-20794, addit10nal work focused on the chemical and electrochemical propert1es of the chrom1c/chromous couple. The solub1lity and stab1lity of chromous and chrom1c Solut1ons were determined, and numerous electrocatalysts were exper1mentally investigated. Gold-lead combinations were identified 1n the sprlng of 1978 as providlng electrochem1cally revers1ble surfaces for the chromium reduction and oxida- tion react1ons. Follow-on work was begun in 1979 under contract DEN3-97 to further develop the gold-lead catalyst system by specifying substrate mater1als and catalyst application methods. Other areas of investigation included alter- 19PDF Image | NASA Redox Storage System Development Project 1980
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