Metal-organic frameworks derived low-crystalline NiCo2S4/Co3S4 nanocages with dual heterogeneous interfaces for high-performance supercapacitors

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu2S/Cu7S4/NC Anode for Hybrid Supercapacitors

“…The S 2p 3/2 peak is located at 161.65 eV, and the S 2p 1/2 peak is at about 162.7 eV. The peaks indicate that the main form of sulfur element in the composites is S 2– . , The peak centered at about 163.5 eV could be attributed to the C–S–C bonds. As shown in Figure e, the C 1s spectrum could be fitted into two peaks at 284.8 and 286.0 eV, corresponding to the sp 2 C–C and C–O bonds. , As shown in Figure f, the high-resolution XPS spectrum of N 1s could be fitted into two peaks.…”

“…The peaks indicate that the main form of sulfur element in the composites is S 2– . 31 , 32 The peak centered at about 163.5 eV could be attributed to the C–S–C bonds. As shown in Figure 2 e, the C 1s spectrum could be fitted into two peaks at 284.8 and 286.0 eV, corresponding to the sp 2 C–C and C–O bonds.…”

Crystalline phase transformation of Co-MOF derivatives on ordered mesoporous carbons for high-performance supercapacitor applications

“…He et al 8 prepared a NiCoP/C nanocomposite by the phosphating treatment of Ni/Co-based MOFs and obtained an increased specific capacitance. Jia et al 9 used Co-MOFs as the precursor to prepare NiCo-LDH, and then NiCo-LDH was converted into NiCo 2 S 4 /Co 3 S 4 via sulfidation. Obtained NiCo 2 S 4 /Co 3 S 4 displays enhanced specific capacitance and cycling stability when compared with its precursors.…”

Review of NiCo2S4-Based Electrode Nanomaterials for Supercapacitors

“…To achieve the "1 + 1 > 2" effect, Chen et al 121 similarly adopted a heterogeneous core−shell structure by combining highly sulfur vacancy-modified NiCo 2 S 4 with amorphous NiCoS 2 as the shell, yielding a specific capacitance of 3200 F g −1 (Figure 6(f)). Jia et al 122 used ZIF-67 as a template to create low-crystalline heterogeneous NiCo 2 S 4 / Co 3 S 4 nanocages. Because heterogeneous electrodes can reduce the internal resistance during charge transfer, the resulting composite electrode had a superior capacity of 1023 C g −1 at 1 A g −1 and exceptional cycling stability, and the capacitance retention reached 89.6% after 5000 cycles (Figure 6(g, h)).…”