Figure 4.

KIE and temperature dependence studies. a) KIE of EIS where water (filled black squares) was replaced with deuterium (open blue squares). b) Temperature dependence of EIS across the X = 0.75 mm junction. c) The activation energy of the process in (b) by fitting to an Arrhenius equation ($G\propto \exp \left(-E_{\mathrm{a}}/k_{\mathrm{B}}T\right)$). The graphs in (a) and (b) are displayed on an isometric scale.