Fig. 7
Microscopy and elemental distribution of indium, and catalytic activity for CO and H2 evolution over structured In/OD Cu electrodes. a Representative SEM micrographs and EDX chemical map of indium of (top) as-prepared electrodes (d = 12.5 μm) after 6 days stored under ambient conditions and (bottom) upon reaction. Scale bars: 5 μm (main images), 200 nm (insets). b Partial current density for CO (jCO) and for H2 (jHER) in eCO2RR electrolyses as a function of the interfacial density (ρint). The corresponding island diameter (d) is also indicated and the trendlines are added as a visual aid. The reaction was carried out in CO2-saturated 0.1 M KHCO3 (pH 6.7) at −0.6 V vs. RHE
