James B Day Jianjun Wu Eric Oldfield Andrzej Wieckowski

Contents

1 Introduction 292

2 Instrumentation 293

2.1 The electrochemical NMR cell 293

2.2 The mini-cell 294

2.3 The NMR probes 295

2.4 The NMR spectrometer 297

3 Experimental results 298

4 Conclusions 299

5 Future research 300

6 References 300

Summary. We describe the design, construction, and operation of two types of nuclear magnetic resonance (NMR) sample probes for use in electrocatalysis/surface NMR studies. The first is an electrochemical NMR cell, which permits observation of NMR signals of surface-adsorbed species under external potential control. This cell also permits conventional voltammograms to be recorded from the actual NMR sample. The second or mini-cell has a long, thin sample region and better sensitivity than the electrochemical NMR cell, but is not capable of voltammetry. Spectra have been obtained for 13CO, 13CN and C15N" adsorbed on polycrystalline platinum black, as a function of applied potential, demonstrating the feasibility of multinuclear NMR studies at electrified interfaces.

0 0

Post a comment