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Improved Methanol Oxidation Activity Through Oxidation-Induced Phase Separation of PtRu Electrocatalysts

Published online by Cambridge University Press:  02 July 2020

R.M. Stroud ,
J.W. Long ,
K.E. Swider  and
D.R. Rolison
R.M. Stroud
Affiliation:
Surface Modification Branch, Naval Research Laboratory, Washington, DC20375
J.W. Long
Affiliation:
Surface Chemistry Branch, Naval Research Laboratory, Washington, DC20375
K.E. Swider
Affiliation:
Surface Chemistry Branch, Naval Research Laboratory, Washington, DC20375
D.R. Rolison
Affiliation:
Surface Chemistry Branch, Naval Research Laboratory, Washington, DC20375
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Extract

Direct methanol fuel cells (DMFCs) offer a simpler, safer technology for point-of-use power sources compared to other hydrogen fuel cells, by avoiding the need to store hydrogen fuel or to carry out the reformation of hydrocarbons. The direct methanol oxidation electrocatalyst of choice is a nanoscale black consisting of a 50:50 atom % mixture of Pt and Ru. It has recently become known that these presumed bimetallic alloys in fact contain an array of metal, oxide and hydrous phases, which are easily misidentified in routine x-ray diffraction measurements due to particle size-broadening and poor crystallinity. By combining transmission electron microscopy, electrochemistry and thermogravimetric studies, we demonstrate here that the route to improved catalytic activity is not by phase purification of the bimetallic alloys, but instead phase engineering of hydrous ruthenium oxide and Pt mixtures.

Type
Sir John Meurig Thomas Symposium: Microscopy and Microanalysis in the Chemical Sciences
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 24 - 25
Copyright
Copyright © Microscopy Society of America

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References

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