CuCo₂S₄–MoS₂ nanocomposite: a novel electrode for high-performance supercapacitors

Abstract

Ternary transition metal sulfides have emerged as promising electrode materials for next-generation supercapacitors because of their potential ability to simultaneously ensure high conductivity and stability during electrochemical reactions. In the...

WITHDRAWN: Prussian blue analogue derived nitrogen‒carbon mixed metal sulfides heterostructure for asymmetric supercapacitors

“…Heterogeneous structures composed of different sul des can signi cantly improve the capacitance performance through the combination or even synergistic action of different components. In addition, by constructing bimetallic sul de electrode materials, the electron/ion migration path can be optimized to expose more active sites and further provide maximum capacitive performance [11][12][13]. For example, Anil Kumar Reddy et al prepared NiCo 2 S 4 @SnS 2 heterostructure materials by hydrothermal vulcanization, and used in situ growth method to grow NiCo 2 S 4 on SnS 2 nanosheets, which effectively limited the particle size and increased more active sites to participate in the reaction.…”

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

“…5a and e. 64 The possible reactions can be illustrated using the following eqn (8)–(14) (M stands for Cu and Mn): 20,40,65,66 MCo 2 O 4 + H 2 O + e − → 2CoOOH + MOHCoOOH + OH − → CoO 2 + H 2 O + e − MOH + x OH − → M(OH) x + e − Co(OH) 2 + OH − → CoOOH + H 2 O + e − MCo 2 S 4 + OH − + H 2 O → MS x OH + 2CoS x OH + e − MS x OH + OH − → MS x O + H 2 O + e − CoS x OH + OH − → CoS x O + H 2 O + e − …”

“…5a and e. 64 The possible reactions can be illustrated using the following eqn ( 8)-( 14) (M stands for Cu and Mn): 20,40,65,66 Nyquist plots of all electrode materials (inset shows the enlarged Nyquist plots). The C s of CuC@CuS@PPy-16/NF (g) and MnC@MnS@PPy-16/NF (h) at different current densities.…”

Encapsulation of Redox p-Benzoquinone into Microporous Carbon Frameworks by a Diamine Covalent-Grafted Strategy for Aqueous Hybrid Supercapacitors

“…Accordingly, the maximum energy density of the NiCoAl-LDH@CNT//AC-PPD-PBQ device can reach 70.9 W h kg –1 at a power density of 709 W kg –1 (Figure S16), and it still retains a high energy density of 52.2 W h kg –1 even when the power density increased to 10 439 W kg –1 . This is higher than those of NiCoAl-LDH@CNT//AC and other previously reported AHSs. − To simply investigate the cycling stability of the NiCoAl-LDH@CNT//AC-PPD-PBQ device, the charging/discharging cycling test is carried out at 6 A g –1 for 5000 cycles (Figure e), in which a capacitance retention of 84.4% and Coulombic efficiency of 100% were retained, exhibiting an excellent cycling performance.…”