Finally, the SA can be estimated and is relatively constant for the different samples with values of 43 ± 6, 52 ± 6, 48 ± 6, 58 ± 4, 47 ± 1 and 50 ± 2 A mAu -2 for samples A-F, as reported in Figure . These result suggest that there is not much specific effect of the different sizes of the NPs when it comes to the EOR. There is potentially a trend to reach slightly higher SAs when the NP size increases which could