“…The reason was that N-doped carbon reduced the signal value of the peak, which further indicated the successful N-doped carbon coating layer formation outside CoO x clusters. , The Raman spectra of the composites of NC@CoO x @GF, CoO x @GF, CoO x , NC@CoO x , and NC@GF are investigated in Figure b and Figure S2b. The intensity of the D and G band of NC@CoO x @GF was 1.53, which is higher than that of PANI@Co-MOF@GO (1.09), showing successful graphene oxide reduction, superior graphitic crystallinity, and enhanced electrical conductivity. , The spectral D and G peaks in the NC@CoO x @GF can be matched as visible I, D, D″, and G bands at ∼1368, ∼1352, ∼1605, and ∼1603 cm –1 , separately, which denoted the existence of conjugated polyene and graphitic lattice disconcertment or sp 2 –sp 3 bonds. , The peak at 686 cm –1 in both CoO x @GF and pure CoO x samples was due to the stretching vibration of Co–O, further indicating that Co-MOF was converted into cobalt oxide after calcination, while it was too weak in NC@CoO x @GF due to N-doped carbon coating outside of the clusters. − …”