Figs. ) and S1(b) also show the results for 100 nm thick electrodes. Again, the plasma-treated Ag100P36 electrode shows higher current densities than the Ag100. However, the FE drops for both electrodes very fast, with the fastest decrease (from 80 to 20% after 4.5 h) for the untreated electrode. The plasma-treated one retains a FE of ~60% after the same operation time.