XPS and EXAFS studies of the reactions of cobalt(III) ammine complexes with gallium arsenide surfaces

Synthesis and characterization of ferromagnetic Zn1−Co O films

“…Previous XPS studies reported a Co p 3/2 at 777.7 eV for Co clusters [31], but Co 3 þ and Co 2 þ were indistinguishable [32]. The parent peak splitting DEC16:0 eV corresponds to the expected splitting of 16.1 eV for Co 2 þ [22,32]. The clear shake-up satellite peaks are further evidence that the chemical valence state of Co ions in the films is þ 2 rather than þ3 [32].…”

“…The peak positions were independent of the Co concentration. Previous XPS studies reported a Co p 3/2 at 777.7 eV for Co clusters [31], but Co 3 þ and Co 2 þ were indistinguishable [32]. The parent peak splitting DEC16:0 eV corresponds to the expected splitting of 16.1 eV for Co 2 þ [22,32].…”

“…The parent peak splitting DEC16:0 eV corresponds to the expected splitting of 16.1 eV for Co 2 þ [22,32]. The clear shake-up satellite peaks are further evidence that the chemical valence state of Co ions in the films is þ 2 rather than þ3 [32]. XRD does not reveal any CoO phase in the films.…”

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

“…The Co(phen) 3 Cl 2 complex shows a band at 781.9 eV and a band at 780.2 eV. 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.…”

Selective synthesis of pure cobalt disulfide on reduced graphene oxide sheets and its high electrocatalytic activity for hydrogen evolution reaction

“…2 a) [ 10 ]. The peaks around 786 and 803 eV are associated with the shake-up type peaks of the 2p 3/2-1/2 and peaks at 782.3 and 798 eV are associated with Co 3+ from the mixture of cobalt sulfides without GO [ 28 ]. For the case of S 2p 3/2-1/2 , doublet peaks appear at 162.9 and 164 eV for the CoS 2 /rGO with 1 mg/mL GO sample and at 162.6 and 163.9 eV for the CoS 2 /rGO with 2.3 mg/mL GO sample, indicating the presence of S 2 2− (Fig.…”