Solid Electrolytes and Photoelectrolysis
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.(1/6) 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1974
- Accession Number
- ADA009145
Entities
People
- Henry Y-p Hong
- James A. Kafalas
- John B. Goodenough
- John G. Mavroides
- Kirby Dwight Jr.
Organizations
- Massachusetts Institute of Technology