Water-based asymmetric supercapacitors with 2.5 V wide potential and high energy density based on Na0.6CoO2 nanoarray formed via electrochemical oxidation

3D nanoflower-like and core–shell structured MCo2O4@MCo2S4@polypyrrole (M = Cu, Mn) composites as supercapacitor electrode materials with ultrahigh specific capacitances

“…4a and d, CV curves of different electrode materials have pairs of redox peaks, which are caused by different faradaic reversible reactions of different electrode materials. 61 And the closed areas of MC@MS@PPy-16/ NF (M = Cu, Mn) are larger than those of other electrode materials (CV curves of all as-prepared samples are displayed in Fig. S9(b, e, h, k, n) and S10(b, e, h, k, n) †), which should be caused by the synergic effect between different metal ions of electrode materials.…”

Construction of Cu7KS4@NixCo1–x(OH)2 Nano-Core–Shell Structures with High Conductivity and Multi-Metal Synergistic Effect for Superior Hybrid Supercapacitors

“…However, to realize the large-scale application of SCs, the problem of low energy density needs to be solved urgently. According to the calculation formula of SCs E = 1/2 C s Δ U 2 , the improvement of energy density ( E ) of SCs can be achieved by increasing their specific capacitance ( C s ) or potential window ( U ) …”

“…According to the calculation formula of SCs E = 1/ 2C s ΔU 2 , the improvement of energy density (E) of SCs can be achieved by increasing their specific capacitance (C s ) or potential window (U). 12 Among many ternary copper sulfides (Cu 7 XS 4 , X is a monovalent cation), Cu 7 KS 4 (CKS) is an ideal supercapacitor electrode material due to its good electrical conductivity. 13 The crystalline structure of CKS consists of a three-dimensional Cu-S framework containing tunneling structures where K + ions reside.…”

Spectator-metal-ion-guided redox-dominant cobalt oxyhydroxide as a high-performance supercapacitor

“…1,2 However, the low energy density levels of SCs restrict the range of their applicability. [3][4][5] The power and energy densities of a supercapacitor are critically influenced by two parameters, namely the potential window at which a supercapacitor operates and the specific capacitance, which is dependent on the active surface area and electro-redox properties of the electrode material. 6,7 Supercapacitors are mainly classified as electric double-layer capacitors (EDLCs) and pseudo-capacitors.…”