Future Research

Studies using the present electrochemical NMR cell designs are practical for many

1 i if I'j types of adsorbates containing magnetically active nuclei such as H, H, "C, 1DN, "O, 103Rh, 195Pt, etc. Plans are under way in this laboratory for studies of the static and dynamic structure of CO on binary and ternary alloys (e.g., ruthenium/platinum/tin) in methanol for fuel-cell applications. Such alloys display enhanced resistance to CO poisoning, and the nature of this resistance is appropriate for NMR investigation. For example, Pt-CO bonding information such as Pt-C connectivities, CO orientation and clustering, are accessible by T\, T2, isotope dilution, and related techniques. In fact, essentially all of the techniques used in the past 20 years to study the solid-gas interface should now be applicable to NMR-electrochemistry, with the added bonus of potential control.

Work in this area is, of course, not limited to using Pt black as the electrocatalyst. Virtually any electroactive catalyst, such as gold, rhodium, or palladium, which can be prepared with a particle size small enough to provide the necessary surface area and RF penetration, can be investigated.

Acknowledgments. The authors acknowledge the Department of Defense under grant number DAAH04-95-0581, the Department of Energy under grant number DE-AC02-76ER01198, and the National Science Foundation under grant number CHE 94-11184.

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