Micron-sized particles of CeO2-δ (f) overlay the FTO surface (g). Size and morphology of CeO2-δ particles were variable, resulting in a nominally rougher surface relative to the FTO substrate. Due to the comparable contrast of the Cu K and Ce L emissions, particles of Cu are challenging to discern for Cu/CeO2-δ. EDS map results for Cu K emission (e) suggest Cu deposits uniformly over the surface, though the absolute counts for Cu K are ~one-tenth those of Ce L (f) or Sn L (g). We note that SEM-EDS is not capable of excluding the possibility of Cu being deposited within or beneath the potentially tortuous CeO2-δ particles, nor is it particularly sensitive to low-coverages or small, highly-dispersed particles.