Construction of high-performance asymmetric supercapacitor based on the hierarchical Ni3S2/CoFe LDH/Ni foam hybrid

Ternary FeCo2Mo5 Oxyhydroxide Nanosheets Integrate on the Surface-Vulcanized Ni Foam for Excellent Electrocatalytic Oxygen Evolution

“…The binding energy of Co 2p 3/2 in the FeCo 2 Mo 5 /Ni 3 S 2 /NF is located at 783.3 eV, which can be fitted into two peaks that are located at 781.3 and 784.3 eV, according to Co 3+ and Co 2+ , respectively. Meanwhile, the Co 2p 1/2 is located at 799.1 eV, and the binding energies of Co 3+ and Co 2+ are 797.4 and 799.3 eV, respectively. , As for the high resolution of the Mo 3d XPS spectrum (Figure d), the peaks from FeCo 2 Mo 5 /Ni 3 S 2 /NF can be matched with two feature peaks at 232.4 and 235.6 eV attributed to Mo 5+ , and 233.1 and 236.2 eV assigned to Mo 6+ . In the S 2p spectrum of Ni 3 S 2 /NF (Figure e), two peaks are noticed, the peaks at 162.7 and 163.5 eV, corresponding to S 2– 2p 3/2 and S 2– 2p 1/2 , prove the successful sulfidation of Ni foam to form Ni 3 S 2 /NF heterojunction .…”

“…Meanwhile, the Co 2p 1/2 is located at 799.1 eV, and the binding energies of Co 3+ and Co 2+ are 797.4 and 799.3 eV, respectively. 25,27 As for the high resolution of the Mo 3d XPS spectrum (Figure 3d), the peaks from FeCo 2 Mo 5 /Ni 3 S 2 /NF can be matched with two feature peaks at 232.4 and 235.6 eV attributed to Mo 5+ , and 233.1 and 236.2 eV assigned to Mo 6+ . In the S 2p spectrum of Ni 3 S 2 /NF (Figure 3e), two peaks are noticed, the peaks at 162.7 and 163.5 eV, corresponding to S 2− 2p 3/2 and S 2− 2p 1/2 , prove the S1.…”

Designing of Kirkendall effect assisted CoFe : WS 2 nanoboxes for dye‐sensitized solar cell and supercapacitor applications

“…From Figure 9C, we could observe conspicuous cobalt peaks positioned at 781.93 and 785.50 eV corresponding to Co2p 3/2 spin‐orbit in an oxidation state of Co 2+ and Co 3+ followed by 797.59 eV peak denoting Co2p 1/2 spin‐orbit in Co 3+ oxidation state. And two more peaks exist at 788.67 eV, and 804.31 eV referred to as satellite peaks representing Co2p 3/2 and Co2p 1/2 spin‐orbit, respectively 47,48 . In the case of iron, two spin‐orbit doublets are representing Fe2p 3/2 , Fe2p 1/2 peaks positioned around 708.62 eV and 721.39 eV representing Fe 2+ bonded with sulfur ions, and an additional shakeup satellite peaks located at 716.06 eV, as shown in Figure 9D.…”

“…As a consequence, we could observe a shift in the peak with additional peaks at (632, 674, 753 cm À1 ), (618, 669, 741 cm À1 ) and (615, 668, 726 cm À1 ) for the composites CoFe: WS 2 -1, CoFe: WS 2 -2, and CoFe: WS 2 -3, respectively. 46 47,48 In the case of iron, two spin-orbit doublets are representing Fe2p 3/2 , Fe2p 1/2 peaks positioned around 708.62 eV and 721.39 eV representing Fe 2+ bonded with sulfur ions, and an additional shakeup satellite peaks located at 716.06 eV, as shown in Figure 9D. Furthermore, two peaks positioned at 713.02 and 723.24 eV accords to Fe2p 3/2 and Fe2p 1/2 spin-orbit due to the presence of Fe 3+ energy state.…”

Sandwich-like NiCo-LDH/rGO with rich mesopores and high charge transfer capability for flexible supercapacitors

“…And the as-obtained Ni 3 S 2 /CoFe/NF exhibits a remarkable areal capacitance of 1397 mF cm −2 at 2 mA cm −2 . 17 Another report loaded ternary NiCo 2 Al LDHs on carbon cloth, and the supercapacitor performance of the as-prepared complex can achieve 1137 F g −1 at 0.5 A g −1 . 18 However, in practical applications, either foamed nickel or carbon fabric substrates have their limitations.…”