Accession Number:
ADA009145
Title:
Solid Electrolytes and Photoelectrolysis
Descriptive Note:
Semiannual technical summary rept. 1 Mar-31 Dec 1974
Corporate Author:
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
Personal Author(s):
Report Date:
1974-12-31
Pagination or Media Count:
30.0
Abstract:
Three classes of cubic skeleton structures are explored for fast Na- ion transport for use as solid electrolytes in Na-S batteries. The cubic KSbO3 structure consists of an SbO3- skeleton having 111 tunnels intersecting at origin and body-center positions. NaSbO3 and NaSbO3.16 NaF disks of ca. 95 percent theoretical density give a Na-ion resistivity at 300C of rho 300 approximately equal 13 ohm-cm and an activation energy E sub a approximately equal 0.35 eV. Preliminary investigations of alumino-silicates having the carnegieite structure show promise, but a rho 300 approximately equal 610 ohm-cm is the best that has been achieved to date. The authors investigated the use of inexpensive, n-type hot-pressed TiO2 powders as the working photocatalytic electrode for achieving photoelectrolysis of water. TiO2 was selected because it is the lowest gap n-type semiconductor that, under illumination at an interface with water, evolves O2 and does not decompose. A study of the physics and electrochemistry of a photoelectrolysis cell consisting of TiO2 as the anode and platinized-platinum as the cathode led to an optimization of the parameters of the system.
Descriptors:
- *ELECTRIC BATTERIES
- *SOLID ELECTROLYTES
- *ELECTROLYSIS
- SODIUM
- ELECTROCHEMISTRY
- SEMICONDUCTORS
- TRANSPORT PROPERTIES
- ELECTRODES
- QUANTUM EFFICIENCY
- CATALYSIS
- SULFUR
- FLUORIDES
- RELIABILITY(ELECTRONICS)
- BATTERY COMPONENTS
- POTASSIUM COMPOUNDS
- TITANIUM OXIDES
- SODIUM COMPOUNDS
- WATER
- ANTIMONATES
- CRYSTAL STRUCTURE
- PHOTOLYSIS
Subject Categories:
- Physical Chemistry
- Electrochemical Energy Storage
- Solid State Physics