Ni-Co sulfide hollow nanoboxes with enhanced lattice interfaces for high performance hybrid supercapacitors

Flower-like Heterogeneous Phosphorus-Doped Co3S4@Ni3S4 Nanoparticles as a Binder-free Electrode for Asymmetric All-Solid-State Supercapacitors

“…The recombination of different transition metal sulfides can form heterogeneous structures, optimize the electron/ion migration path, fully expose the surface active sites, and greatly improve the electrochemical energy storage performance . In particular, the capacitance of nickel-cobalt sulfide is much higher than that of other binary metal sulfides due to the perfect synergy between Ni and Co elements. , Wu et al reported a strategy to obtain nickel-cobalt sulfide, which has rich lattice interfaces and widespread mesopores . The unique structure can effectively improve the ion diffusion rate and shorten the electron transport path.…”

“…19,20 Wu et al reported a strategy to obtain nickel-cobalt sulfide, which has rich lattice interfaces and widespread mesopores. 21 The unique structure can effectively improve the ion diffusion rate and shorten the electron transport path. The synergistic effect between the bimetals further improves the electrochemical performance, with a high specific capacitance of 1578 F g −1 at 1 A g −1 .…”

Enhancement of the capacitive performance of Ni2CoS4 by incorporation of graphitized carbon dots

“…The deconvolution peaks at binding energies of 853.3 eV and 870.1 eV are attributed to the Ni 2p 3/2 and Ni 2p 1/2 of Ni 2+ , while the peaks at 857.0 eV and 874.8 eV are derived from Ni 3+ . 47 The Co 2p spectrum in Fig. 3(d) also presents two different spin–orbit doublets and two oscillating satellites, similar to the Ni 2p spectrum.…”

“…S1(a To explore elemental compositions and valence states of a substance, XPS is a useful technique. The XPS survey spectrum 47 The Co 2p spectrum in Fig. 3(d) also presents two different spin-orbit doublets and two oscillating satellites, similar to the Ni 2p spectrum.…”

CoNi2S4 Electrode with High Mass‐Loading for High‐Energy‐Density Supercapacitor: Role of S‐Containing Anions Exchange

“…It should be pointed out that there were different affiliations of such peaks in the literatures [31–34] . In this work, the peaks at 161.5 eV for S 2p 3/2 and 162.7 eV for S 2p 1/2 are indexed to metal‐S bonds (Ni−S or Co−S), and the peak at 164.2 eV is related to the low‐valence S species (S 8 molecules or polysulfide ions) [35–37] . The peak at 167–171 eV is assigned to the surface S species in higher oxidation state, mostly coming from sulfate or sulfite‐like species from surface oxidation [38] .…”