High-performance solid-state supercapacitor based on Ni-Co layered double hydroxide@Co3O4 nanocubes and spongy graphene electrodes

“Salt-in-Fiber” Electrolyte Enables High-Voltage Solid-State Supercapacitors

“…Figure a shows the CVs at 20 mV/s for the CAC/LCNF/CAC device in the potential range of 1.7–2.3 V. Upon enlarging the potential window, the CV exhibits a rectangular shape without any noticeable parasitic reactions. Moreover, Figure b illustrates the GCD curves, which reveal stable charge/discharge behavior upon extending the potential window to 2.3 V with distortion in the ideal EDL performance that is usually ascribed to handling issues usually seen during the fabrication of solid-state devices . The assembled aqueous and hydrogel electrolyte-based devices showed limited working potential windows of 1.8 and 2 V, respectively (see Figures S1 and S2).…”

“…Moreover, Figure 3b illustrates the GCD curves, which reveal stable charge/discharge behavior upon extending the potential window to 2.3 V with distortion in the ideal EDL performance that is usually ascribed to handling issues usually seen during the fabrication of solid-state devices. 31 The assembled aqueous and hydrogel electrolyte-based devices showed limited working potential windows of 1.8 and 2 V, respectively (see Figures S1 and S2). The effect of enlarging the potential window of the solid-state device on both capacitance and energy density is shown in Figure 3c.…”

Progress of layered double hydroxide-based materials for supercapacitors

“…239 However, the direct use of ZIFs as electrode materials has limited exposure to electroactive sites, poor chemical stability, slow charging kinetics and unsatisfactory electrochemical performances. 240 How to combine their advantages and give full play to their performance becomes a key issue. Liao et al 241 demonstrated the in situ transformation of ZnCo-ZIFs modified on ZnCo nanorod arrays (ZnCo-NA) into 3D spatially distributed ZnCo-LDHs/ZnCo-NA heterostructures (Fig.…”

Mixed solvent-assisted synthesis of high mass loading amorphous NiCo-MOF as a promising electrode material for supercapacitors

“…However, despite the above-mentioned great advances, MOF materials still face numerous difficulties when directly employed as electrodes such as poor conductivity, poor rate capability and limited cycle stability. 16–18…”

“…However, despite the above-mentioned great advances, MOF materials still face numerous difficulties when directly employed as electrodes such as poor conductivity, poor rate capability and limited cycle stability. [16][17][18] Thus, to overcome these shortcomings, researchers have adopted various strategies such as tuning the proportion of metal ions, 19 adjusting the pH value 20 and altering the reaction temperature and time during the synthesis of MOFs. 21,22 Additionally, regulating the solvent in the reaction system is considered to be a simple and effective method to modify MOF materials.…”