(Figure ). Applying surface heating in electrocatalytic CO2R trials, we observe an increase in activity for both CO2R and HER, which is consistent with all previous reports (Figure ). We see a 2x increase in partial current density and up to 10% increase in Faradaic efficiency at -1.03 V vs RHE for carbon-coupled products (Figure ). We observe no appreciable improvement in C2+ partial current density heating the surface from 43 to 60 °C, supporting the hypothesis from Koper et. al that other factors, such as structural changes, may be significant factors at these elevated temperatures. Unexpectedly, we do not observe a noticeable shift in onset potential for C2+ products. We suspect this may be the case due to the increase in partial current density towards hydrogen evolution dominating at more positive potentials or the high convection in the system convoluting the transport of intermediates at the surface. Temperatures above 80 °C were unable to be tested on bare copper due to the total current density exceeding the limitations of the HT-ANEC screening system. 28