The C 1s spectrum in Fig. 4e originates
from both rGO and CO3
2
anions in the LDH interlayer space. The
peak at 284.8 eV represents non-oxygenated carbon (C¼C) from
rGO nanosheets. The carbonyl carbon at 286.2 eV and the
carboxylate carbon (OC¼O) at 288.7 eV may come from
CO3
2
or rGO