Graphene-based non-noble-metal Co/N/C catalyst for oxygen reduction reaction in alkaline solution

Cobalt and Iron Complexes with N-heterocyclic Ligands as Pyrolysis Precursors for Oxygen Reduction Catalysts

“…A signal centered at 781.6 eV has been observed in the [Co(III)(NH 3 ) 6 ](Br) 3 complex [40], while a binding energy at 780.4 eV was measured for the Co 2p 3/2 level in the [Co(II)(terpyridine)(bipyridine)Cl]Cl complex [41]. Bands assignable to metallic Co (778 eV) [47][48][49][50] were not detected in any sample. From these findings, we conclude that the CoO and metallic particles observed in the diffractograms must be covered with different amounts of oxides, being these compounds partially or totally coordianted on their surfaces to nitrogen (pyridinic-N).…”

“…Signals from the precursor complex could be detected after thermal treatment at 300 C in agreement with the TGA analysis. [47][48][49]. Pyridinic-N refers to the nitrogen atom on the edge of graphite planes with two adjacent carbon atoms.…”

“…5, correspond to the Co 2p 3/2 binding energy spectra. They were deconvoluted into the following sub-spectra centered at: 779.3 AE 0.3 eV, 780.0 AE 0.3 and 781.8 AE 0.4 eV, which can be assigned to Co 3 O 4 (779.4 eV), CoO (780 eV) and Co coordinated to N respectively (781.8 eV), according to literature data [47][48][49][50]. The Co(phen) and Co(TPTZ) derived catalysts displayed a band at 781 eV which is tentatively assigned to CoO.…”

Facile synthesis of N-doped carbon nanosheet-encased cobalt nanoparticles as efficient oxygen reduction catalysts in alkaline and acidic media

“…With the typical spinel crystalline structure, cobaltosic oxide (Co 3 O 4 ) is widely known as the ORR electrocatalytic active form among non-precious metal catalysts [28] Strong interactions between the supported nanoparticles and graphene sheets play the key role in dominating the final ORR activity and stability [29]. Great efforts have been made to develop various cobalt catalysts for ORR, but most of them often involved highly toxic reagents [30] or tedious multistep treatments [31,32]. So, their complex preparation method and general performance is still not suitable for mass production [33].…”

An overview of the electrochemical performance of modified graphene used as an electrocatalyst and as a catalyst support in fuel cells

“…In addition to Pt, NG was incorporated with other metals, namely as Co and Fe, by Niu et al [77] and Hung et al [78], respectively. The transition metals could coordinate easily with nitrogen to form an M-N x structure, which is a highly active site for facilitating the ORR.…”