EXAFS Analysis of Electrocatalytic WC Materials

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• 作者：B. Ingham ; C. D. A. Brady ; G. T. Burstein ; N. Gaston ; M. P. Ryan
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：October 8, 2009
• 年：2009
• 卷：113
• 期：40
• 页码：17407-17410
• 全文大小：144K
• 年卷期：v.113,no.40(October 8, 2009)
• ISSN：1932-7455

文摘

Tungsten carbide is an interesting non-noble metal anode electrocatalyst that can be passivated against corrosion in acidic electrolytes for use in low-temperature fuel cells. The structure of nanocrystalline WC passivated in 1.5 M H₂SO₄ at 65 °C was studied using synchrotron extended X-ray absorption fine structure spectroscopy and compared with the as-prepared material. Changes in the average local structure are noted that correspond to the development of an oxide phase in the material. This is most likely to be present as a W^IV-oxide phase on the surfaces of the particles.