Accession Number:

AD0647788

Title:

INVESTIGATION OF MECHANISMS FOR ELECTROCHEMICAL CATALYSIS

Descriptive Note:

Quarterly rept. no. 2, 1 Aug-31 Oct 1966

Corporate Author:

PRATT AND WHITNEY AIRCRAFT GROUP EAST HARTFORD CT

Personal Author(s):

Report Date:

1967-02-01

Pagination or Media Count:

20.0

Abstract:

A program is being conducted to investigate the mechanisms of electrocatalysis with respect to the anodic oxidation of selected fuels by novel electrocatalysts in acid electrolyte at temperatures below 150C and at ambient pressure. Most of the effort is on select transition metal silicides surface- doped with trace amounts of platinum andor gold. Some additional materials transition metal borides were screened for use as possible electrocatalysts. The electrochemical behavior of TaSi2 in acid electrolyte was studied by measuring the polarization via triangular potential sweep and steady-state methods. The catalytic activity of TiSi2 and MoSi2 surface-doped with platinum and gold by various techniques was investigated. None of the new materials screened showed sufficient corrosion resistance in acid for use as catalysts or supports. TaSi2 in the absence of fuel gave a relatively high cathodic current in the potential range from zero to 200 mV which is difficult to explain on the basis of known reactions. MoSi2 was not amenable to surface-doping but this technique applied to TiSi2 gave promising catalytic activity for the oxidation of hydrogen. Platinum and gold deposited simultaneously in trace amounts on TiSi2, resulted in higher catalytic activity for hydrogen oxidation than the deposition of platinum alone or gold deposition followed by platinum deposition.

Subject Categories:

  • Physical Chemistry
  • Electric Power Production and Distribution

Distribution Statement:

APPROVED FOR PUBLIC RELEASE