In Situ Growth of Core–Shell Heterostructure CePO₄@CuCo₂S₄ As Advanced Electrodes for High-Performance Supercapacitor

Abstract

The design of multicomponent core–shell heterostructures is considered to be an efficacious way to develop excellent performance supercapacitor electrode materials. A new strategy CePO4@CuCo2S4 core–shell heterogeneous structure is devised by preparing porous CePO4 nanosheets as cores via hydrothermal reaction and solid-state phosphating methods and electrochemically deposited CuCo2S4 nanosheets as shells. Binder-free three-dimensional (3D) porous CePO4@CuCo2S4 nanosheets grown on foam nickel substrate can provide an ordered porous nanoframe, promote electrode/ion transport, and generate the effective synergy of good conductivity from CePO4 and excellent redox activity from CuCo2S4. As a consequence, the CePO4@CuCo2S4 electrode exhibits an outstanding specific capacitance (2897.8 F g–1 at 0.5 A g–1), a superb capacity retention rate (70.1% at 20 A g–1), and excellent cycle stability (after 10,000 cycles or maintain 94.4%), superior to those of bare CePO4 and CuCo2S4 electrodes. In addition, an asymmetric hybrid supercapacitor is assembled by CePO4@CuCo2S4 and activated carbon, when the energy density is 80.4 Wh kg–1 and the corresponding power density is 799.5 W kg–1.

Facial Synthesis of Fe3O4/PPy Core–Shell Composite Electrode Material for Boosted Supercapacity

“…Especially, NCS/CNT shows an excellent capacity of 603 C g –1 . CePO 4 @CuCo 2 S 4 exhibits an outstanding capacitance (2897.8 F g –1 at 0.5 A g –1 ) . CuO/CF@NiCoMn-OH exhibits a high capacitance of 26.8 F cm –2 at 8 mA cm –2 .…”

“…35 CePO 4 @CuCo 2 S 4 exhibits an outstanding capacitance (2897.8 F g −1 at 0.5 A g −1 ). 36 CuO/CF@NiCoMn-OH exhibits a high capacitance of 26.8 F cm −2 at 8 mA cm −2 . 37 NiMoO 4 /V 2 CTx@rGO shows a capacitance of 1022 F g −1 at 1 A g −1 .…”

CuCoNi–S anchored CoMoO4/MoO3 forming core–shell structure for high-performance asymmetric supercapacitors

“…31,32 To further realize their commercial application, introducing transition metal sulfides with high electrical conductivity to enhance the electrochemical properties of CoMoO 4 and MoO 3 may be a promising strategy. Transition metal sulfides are regarded as auspicious electrode materials for supercapacitors, 33 which possess outstanding electrochemical behavior, such as excellent conductivity, low electronegativity, better cycling stability, higher energy density and ionic diffusivity. 34,35 Additionally, some reports indicated that the electrochemical performance of multi-component transition metal sulfides is better than that of individual sulfides.…”

Performance evaluation of Zr(CUR)/NiCo2S4/CuCo2S4 and Zr(CUR)/CuCo2S4/Ag2S composites for photocatalytic degradation of the methyl parathion pesticide using a spiral-shaped photocatalytic reactor

“…Among them, the construction of composite structures is well-known as an effective modification approach for boosting photocatalytic performance. CuCo 2 S 4 is a typical thiospinel compound that is used in many fields such as the preparation of solar cells, 7 construction of supercapacitors, 8 and production of lithium-ion batteries. 9 Several properties of CuCo 2 S 4 including the electronic band structure, thermal stability, and controllable morphology make it a unique photocatalyst.…”