Fig. 3: Oxidoreduction of STEMPO•/STEMPO+, monitored with in situ FE-EPR.
a, CV scan recorded at 5 mV s−1, simultaneously with EPR measurements, in the FE-EPR cell placed inside the EPR cavity. The scan direction is indicated with arrows. Peak separation, 19 mV, E(non-catalytic, CV) = +830 mV. b, EPR spectra at the potentials highlighted on the CV scan in a during the forward (blue) and reverse (red) CV scans (Extended Data Fig. 3 presents a complete set of EPR spectra). c, Double integrals of the EPR spectra (normalised to the maximum data point) plotted against potential and fitted with a 1e− Nernst equation during forward (blue, Eforward(non-catalytic, FE-EPR) = +831 mV) and reverse (red, Ereverse(non-catalytic, FE-EPR) = +830 mV) CV scans. Grey open circles are from all EPR spectra collected (Extended Data Fig. 3), and coloured circles correspond to the EPR data shown in b.
