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

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.

Subject Categories:

  • Physical Chemistry
  • Electrochemical Energy Storage
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE