Methanol oxidation on single-phase Pt-Ru-Os ternary alloys
Journal Article
·
· Journal of the Electrochemical Society
- Illinois Inst. of Tech., Chicago, IL (United States)
Methanol oxidation was studied on arc-melted Pt-Ru-Os alloys and on fuel cell catalysts prepared by the NaBH{sub 4} reduction of metal chloride salts. Both the arc-melted alloys and the high surface area catalysts have x-ray diffraction patterns indicative of single-phase face-centered cubic lattices. Hydrogen adsorption/desorption measurements on the polished alloy electrodes, in the presence of adsorbed CO (25 C), show that selected ternary alloys have significant hydrogen adsorption/desorption integrals at adsorption potentials where Pt:Ru (1:1) was fully blocked and higher integrals at all adsorption potentials studied up to 400 mV vs. the reference hydrogen electrode. In situ diffuse reflection Fourier transform infrared spectroscopy of the fuel cell anodes showed that the alloy catalysts had reduced CO coverage relative to Pt, with the ternary catalyst showing the least coverage. Steady-state voltammetry of the arc-melted alloys at 25 C confirmed that Pt-Ru-Os (65:25:10) is more active than Pt-Ru (1:1), particularly above 0.6 V. Pt-Ru-Os (65:25:10) methanol fuel cell performance curves were consistently superior to those of Pt-Ru (1:1) (e.g., typically at 90 C, 0.4 V; 340 mA/cm{sup 2} with Pt-Ru-Os vs. 260 mA/cm{sup 2} with Pt-Ru).
- Sponsoring Organization:
- Department of the Army, Washington, DC (United States); Advanced Research Projects Agency, Washington, DC (United States)
- OSTI ID:
- 511937
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Potential-dependent infrared absorption spectroscopy of adsorbed CO and X-ray photoelectron spectroscopy of arc-melted single-phase Pt, PtRu, PtOs, PtRuOs, and Ru electrodes
A coulometric normalization procedure for comparing high surface area methanol anode catalysts by rotating disk electrode voltammetry
The effect of the surface composition of Ru-Pt bimetallic catalysts for methanol oxidation
Journal Article
·
Thu Apr 20 00:00:00 EDT 2000
· Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
·
OSTI ID:20030677
A coulometric normalization procedure for comparing high surface area methanol anode catalysts by rotating disk electrode voltammetry
Journal Article
·
Sun Jun 01 00:00:00 EDT 1997
· Journal of the Electrochemical Society
·
OSTI ID:516886
The effect of the surface composition of Ru-Pt bimetallic catalysts for methanol oxidation
Journal Article
·
Mon Feb 22 19:00:00 EST 2016
· Electrochimica Acta
·
OSTI ID:1326766