Correlation of structure–performance in mesoporous Zn₁₋ₓNiₓCo₂O₄ microspheres: Toward design of more efficient electrodes for asymmetric supercapacitors

Ni,Zn-codoped MgCo2O4 electrodes for aqueous asymmetric supercapacitor and rechargeable Zn battery

Highly efficient and stable negative electrode for asymmetric supercapacitors based on graphene/FeCo2O4 nanocomposite hybrid material

Controlled synthesis of unique Co9S8 nanostructures with carbon coating as advanced electrode for solid-state asymmetric supercapacitors

Herein, we report a nanoarchitectured nickel molybdate/carbon fibers@pre-treated Ni foam (NiMoO4 /CF@PNF) electrode for supercapacitors. The synthesis of NiMoO4 /CF@PNF mainly consists of a direct chemical vapor deposition (CVD) growth of dense carbon fibers (CFs) onto pre-treated Ni foam (PNF) as the substrate, followed by in situ growth of NiMoO4 nanosheets (NSs) on the CF@PNF substrate by means of a hydrothermal process. The NiMoO4 /CF@PNF electrode exhibits a high areal capacitance (5.14 F cm(-2) at 4 mA cm(-2) ) and excellent cycling stability (97 % capacitance retention after 2000 cycles at 10 mA cm(-2) ). Furthermore, we have successfully assembled NiMoO4 NSs//activated carbon (AC) asymmetric supercapacitors, which can achieve an energy density of 45.6 Wh kg(-1) at 674 W kg(-1) , and excellent stability with 93 % capacitance retention after 2000 cycles at 5 mA cm(-2) . These superior properties hold great promise for energy-storage applications.

Super-conductive silver nanoparticles functioned three-dimensional CuxO foams as a high-pseudocapacitive electrode for flexible asymmetric supercapacitors

Interconnected Co 0.85 Se nanosheets as cathode materials for asymmetric supercapacitors

Fabricating hierarchical core-shell nanostructures is currently the subject of intensive research in the electrochemical field owing to the hopes it raises for making efficient electrodes for high-performance supercapacitors. Here, we develop a simple and cost-effective approach to prepare CuO@MnO2 core-shell nanostructures without any surfactants and report their applications as electrodes for supercapacitors. An asymmetric supercapacitor with CuO@MnO2 core-shell nanostructure as the positive electrode and activated microwave exfoliated graphite oxide (MEGO) as the negative electrode yields an energy density of 22.1 Wh kg−1 and a maximum power density of 85.6 kW kg−1; the device shows a long-term cycling stability which retains 101.5% of its initial capacitance even after 10000 cycles. Such a facile strategy to fabricate the hierarchical CuO@MnO2 core-shell nanostructure with significantly improved functionalities opens up a novel avenue to design electrode materials on demand for high-performance supercapacitor applications.

CaMoO4 nanoparticles/graphene oxide (CaMoO4/GO) composites are prepared by a facile hydrothermal method. CaMoO4 nanoparticles are adsorbed on the GO sheets by in situ reduction. Along with the synergistic effect between the CaMoO4 and GO sheets, the CaMoO4/GO nanocomposites exhibited high performances as electrodes for supercapacitors. The specific capacity ([Formula: see text] of the CaMoO4/GO electrodes could be up to 571.82[Formula: see text]F[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] at 0.5[Formula: see text]A[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text]. Furthermore, asymmetric supercapacitors (ASCs) are mainly composed of CaMoO4/GO composite and activated carbon (AC), respectively. The fabricated CaMoO4/GO//AC devices display an energy density of 25.18[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]h[Formula: see text][Formula: see text][Formula: see text]kg[Formula: see text] at 1710.3[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]kg[Formula: see text]. A blue LED is powered using two series-connected two ASC devices. These results indicate the considerable potential of CaMoO4/GO for use in high-performance energy storage devices.

Hierarchical CuCo2S4@NiMn-layered double hydroxide core-shell hybrid arrays as electrodes for supercapacitors

Hierarchical Fe2O3 and NiO nanotube arrays as advanced anode and cathode electrodes for high-performance asymmetric supercapacitors

Hierarchical Mo9Se11 nanoneedles on nanosheet with enhanced electrochemical properties as a battery-type electrode for asymmetric supercapacitors

Porous TMP nanosheets have been prepared by the phosphorization of a sheet-like NiCo hydroxide precursor, and can be used as efficient and stable positive electrodes for advanced asymmetric supercapacitors with high specific capacitance, good rate performance and long-term stability.

Introduction of defects and engineering of structure play significant roles in improvement on electrochemical performances of copper sulfide (Cu9S5) as a supercapacitors (SCs) electrode. Herein, a hierarchical rose-shaped Cu9S5 is synthesized by using a facile one-step hydrothermal method and subsequently annealed under different atmospheres and time. X-ray photoelectron spectroscopy (XPS) spectra and scanning electron microscopy (SEM) confirm the presence of sulfur vacancies and changes of morphology in Cu9S5 annealed under argon (Ar) for 2 h (Cu9S5-Ar-2h), which exhibit an effective promotion to the surface redox reactions and ion transition ability proved by the electrochemical measurements. Thus, when the Cu9S5-Ar-2h is used as an SCs electrode, it performs the highest specific capacity of 337 C/g at a scanning rate of 5 mV/s, which is nearly four times that of the pristine Cu9S5 (92 C/g). Moreover, an asymmetric supercapacitor using Cu9S5-Ar-2h as a positive electrode and activated carbon as a negative electrode is designed and assembled, which demonstrates a good energy density of 13.2 Wh/kg at a power density of 789.5 W/kg and an outstanding cycling stability of near 100% after 2000 cycles. This work will provide a feasible strategy to construct advanced electrodes based on transition metal sulfides by annealing treatments.

Porous cobalt sulfide (Co9S8) nanostructures with tunable morphology directly nucleated over carbon fiber are evaluated as electrodes for asymmetric hybrid supercapacitors.

Novel core-shell multi-dimensional hybrid nanoarchitectures consisting of Co(OH)2 nanoparticles/Ni3S2 nanosheets grown on SiC nanowire networks for high-performance asymmetric supercapacitors