caa a22 4500 477050026 CHVBK 20180405111338.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00242105 doi (NATIONALLICENCE)springer-10.1007/BF00242105 Performance and thermodynamic properties of Na-Sn and Na-Pb molten alloy electrodes for alkali metal thermoelectric converter (AMTEC) [Elektronische Daten] [Q. Fang, H. Wendt] An alkali metal thermoelectric converter (AMTEC) testing cell was set up, and run with molten sodium-tin (Na-Sn) and sodium-lead (Na-Pb) alloy cathodes. The Na activity, the partial molar enthalpy and partial molar entropy of sodium in molten Na-Sn and Na-Pb alloys have been determined, using a Na concentration cell: Na(1) I beta″-alumina Na-Me(1), where Me= Sn or Pb. The thermodynamic results of these investigations agree with those of other authors. The electric performance of these Na-Me alloy electrodes of different Na concentration and temperatures is described, measuring current-voltage characteristics and a.c. impedance in the AMTEC test cell. The power density of the AMTEC cell with molten alloy cathodes decreases with increasing Na concentration, with the Na concentrations in molten alloys varying from 0.5 to 15 mol%. Maximum power densities of 0.21 to 0.15 W cm−2 at 700°C for Na-Sn molten electrodes, and 0.30 to 0.15 W cm−2 for Na-Pb molten electrodes have been obtained. The a.c. impedance data demonstrated that the molten alloy electrodes have a smaller cell resistance, 0.3-0.35 S2 cm−2 at 700°C after 10-20 h. Comparison with the sputtered thin, porous film electrodes, showed that the contact resistance between electrode and surface of beta″-alumina plays an important role on enhancing cell power density. At 700°C the power density of an AMTEC cell with the molten Na-Pb alloy electrode can be raised to values of about 0.2 W cm eat current densities of 0.8 A cm−2, but at cell voltages not exceeding 0.2V. A model for the theoretical efficiency of the AMTEC cell with molten Na metal electrodes is also presented. Chapman & Hall, 1996 Fang Q. Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei Anhui, China aut Wendt H. Institut für Chemische Technologie, Technische Hochschule Darmstadt, Petersen Str. 20, 64287, Darmstadt, Germany aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/3(1996-03-01), 343-352 0021-891X 26:3<343 1996 26 10800 https://doi.org/10.1007/BF00242105 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00242105 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fang Q. Department of Materials Science and Engineering, University of Science and Technology of China, 230026, Hefei Anhui, China aut NATIONALLICENCE 700 1- Wendt H. Institut für Chemische Technologie, Technische Hochschule Darmstadt, Petersen Str. 20, 64287, Darmstadt, Germany aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/3(1996-03-01), 343-352 0021-891X 26:3<343 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer