Honeycomb-like metallic nickel selenide nanosheet arrays as binder-free electrodes for high-performance hybrid asymmetric supercapacitors

Abstract

Hybrid asymmetric supercapacitors based on Ni0.85Se nanosheet arrays and activated carbon show remarkable energy-storage characteristics and promising applicable value.

Ni(OH)2 Nanoflakes Supported on 3D Ni3Se2 Nanowire Array as Highly Efficient Electrodes for Asymmetric Supercapacitor and Ni/MH Battery

“…According to the phase diagram, these three materials have stable phases, and their physical–chemical properties strongly depend on their composition, phase structure and morphology. Substantial effort was made to transform Ni 1– x Se and NiSe 2 into high capacitance electrode materials for energy storage, such as Ni 0.85 Se nanosheets (3105 F g −1 at 1 A g −1 ), NiSe nanowires (1790 F g −1 at 5 A g −1 ), and NiSe 2 (1044F g −1 at 3A g −1 ) . However, there are only few reported synthesis procedures of Ni 3 Se 2 which theoretically has better conductivity than NiSe.…”

Hierarchical MnCo2O4/NiMn Layered Double Hydroxide Composite Nanosheet Arrays on Nickel Foam for Enhanced Electrochemical Storage in Supercapacitors

“…Figure c presents the CV curves from the MnCo 2 O 4 /Ni 3 Mn LDH composite electrode at different scan rates. As shown, the peak currents increased with increasing the scan rates, meaning that a fast redox reaction occurred in the composite electrode ,. Moreover, the anodic and cathodic peaks shifted towards more positive and negative potentials, respectively, as the scan rates were increased.…”

One‐Pot Synthesis of Sulfur and Nitrogen Co‐Functionalized Graphene Material using Deep Eutectic Solvents for Supercapacitors

“…The vertical line at low frequencies signifies the governance of ideal double-layer charge/discharge behaviors. [62] The energy densities and power densities were calculated for SN-rGO according to Equations (4) and (5) (Experimental Section), and their Ragone plot is given in Figure 7d.W ec an conclude that the SN-rGO electrode exhibits good electrochemical properties and adsorption of ions onto the electrode surface and contact at the electrode/ electrolyte interface is good. [42] Electrochemical characterization was also performed by using as ymmetrical two-electrode system.…”

“…The half semicircle occurred for SN-rGO in the high-frequency region,a nd the straight line in the lowfrequency region is caused by the formation of the electric double layer at the electrode/electrolyte boundary. [62] In the high-frequency region, the intercept at the real impedance axis is correlated with the internal resistance. From the inset of (Figure 6e), it can be assumed that SN-rGO can provide a lower interfacial charge transfer resistance( R ct ), indicating good conductivity of the test system.…”

“…[65] From the pattern showni n ( Figure 7c), it is observed that the specific capacitance values decrease with increasing current densities;t his occurs because of the reduced flow of ions into the layered and porous structure of the SN-rGO electrode at higher current densities. [62] The energy densities and power densities were calculated for SN-rGO according to Equations (4) and (5) (Experimental Section), and their Ragone plot is given in Figure 7d.W ec an conclude that the SN-rGO electrode exhibits good electrochemical properties and adsorption of ions onto the electrode surface and contact at the electrode/ electrolyte interface is good.…”