Se-doped nickel-cobalt sulfide nanotube arrays with 3D networks for high-performance hybrid supercapacitor

Influence of Mo concentration on the structural and electrochemical properties of double-doped Mo–Co–Ni3S2/NF composites

“…4b exhibit two primary spin-orbit doublets with binding energies of 776.2 and 793 eV, respectively, attributed to Co 3+ 2p 3/2 and Co 2p 1/2 . 43,44 In a similar vein, Co 2p 3/2 and Co 2p 1/2 of the Co 2+ oxidation state are associated with the recorded peaks at 781.6 and 797 eV, respectively. The remaining two peaks, positioned at 787.3 eV and 807.3 eV are the shakeup satellite peaks.…”

“…Previous studies indicate that these two main split-orbit peaks are indicative of the hexavalent Mo 6+ oxidation state. 9,43,44…”

“…Previous studies indicate that these two main splitorbit peaks are indicative of the hexavalent Mo 6+ oxidation state. 9,43,44 The S 2p spectrum resolution is high (Fig. 4d), showing two signals at 163.1 eV and 164.7 eV, corresponding to S 2p 3/2 and S 2p 1/2 states, 34,[45][46][47] and the peak at 169.8 eV is correlated with SO 4 2− , which is caused by surface oxidation.…”

NiCo-compounds inside and outside N-doped carbon nanotubes to construct a double-enhanced hierarchical structure for high energy density supercapacitors

“…26–28 Transition metal selenides exhibit higher electrical conductivity and lower electronegativity than metal oxides and sulphides, thereby facilitating redox reactions. 29,30 Notably, the synergistic effect observed in Ni–Co bimetallic selenides, as opposed to monometallic (Ni, Co) selenides, contributes to electrode materials with lower charge transfer resistance. 31 Li et al 32 successfully synthesized N-doped nanocarbon hybrids ((Ni 0.75 Co 0.25 )Se 2 @NC) using bimetallic organic frameworks of Ni and Co (NiCo-MOFs) through an ethylene glycol solvothermal method.…”