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S. Figure, left column) after 3 h of CA at 2 V vs RHE in NaOH and (right column) after 130 h of CA at 2.3 V vs RHE in Li/K borate at several magnifications: a) 50 000x times, b) 20 000x, c) 10 000x and d, SEM images recorded on n-Siplanar/Fe(2s), vol.5, p.0