Coelectrodeposition of NiSe/ZnSe Hybrid Nanostructures as a Battery-Type Electrode for an Asymmetric Supercapacitor

Abstract

A NiSe/ZnSe (NZSe) hybrid nanostructure was fabricated via the coelectrodeposition method on nickel foam substrate as a binder-free electrode for asymmetric supercapacitors. The Ni/Zn ratio has a great impact on the morphologies and electrochemical properties of NZSe composites. Under an optimal Ni/Zn ratio, the resultant NZSe hybrid electrode exhibits excellent electrochemical performance with a high specific capacity of 651.5 mAh g–1 at 1 A g–1, which is noteworthy higher than that of pure NiSe (267.5 mAh g–1) and ZnSe (211.1 mAh g–1) at the same current density. Moreover, the NZSe electrode exhibits a satisfying cyclic stability of 2000 cycles (97.6% retention of its initial capacity value). The noticeable performance improvement is attributable to the synergetic effect of NiSe and ZnSe, and the unique hierarchical nanostructure of NZSe also plays an essential role in providing high conductivity, rich redox reactions, short ion diffusion, and efficient charge transport. An asymmetric supercapacitor assembled by utilizing the NZSe hybrid electrode as a positive electrode and active carbon (AC) electrode as the negative electrode delivers a high specific energy of 44.4 Wh kg–1 and superior cycling stability (98.7% capacitance retention after 10 000 cycles).

Hybrid ZnSe‐SnSe2 Nanoparticles Embedded in N‐doped Carbon Nanocube Heterostructures with Enhanced and Ultra‐stable Lithium‐Storage Performance

“…Two main peaks fitted at 53.3 and 54.3 eV belongs to Se 3d 5/2 and Se 3d 3/2 (Figure 5c) [20,27] . The detail peaks of Zn 2p situated at 1022.3 and 1045.4 eV in Figure 5d related to Zn 2p 3/2 and Zn 2p 1/2 confirm the Zn 2+ state in ZSS⊂NCNs [46,47] . The high‐resolution XPS spectrum in Figure S3a displays two peaks located at 284.6 and 286.6 eV, corresponding to C−C/C=C and C−N bonds, respectively [20] .…”

“…[20,27] The detail peaks of Zn 2p situated at 1022.3 and 1045.4 eV in Figure 5d related to Zn 2p 3/2 and Zn 2p 1/2 confirm the Zn 2 + state in ZSS�NCNs. [46,47] The high- resolution XPS spectrum in Figure S3a displays two peaks located at 284.6 and 286.6 eV, corresponding to CÀ C/C=C and CÀ N bonds, respectively. [20] Figure S3b exhibits two fitted peaks at 398.3 and 400.4 eV indicate pyridinic N and pyrrolic N doping in the carbon layer and thus adsorb more Li + and improve the electronic conductivity to exhibit higher specific capacity.…”

A self-templating scheme for the synthesis of NiCo2Se4 and BiSe hollow microspheres for high-energy density asymmetric supercapacitors

“…4a displays the cyclic voltammetry (CV) curves of the NiCo 2 Se 4 HMSs electrode at different scan rates ranging from 5 to 60 mV s −1 in the potential windows of −0.2-0.8 V, which exhibit a pair of obvious redox peaks, indicating reversible and rich redox reactions of Co 2+ /Co 3+ and Ni 2+ /Ni 3+ . [78][79][80] It is worth noting that the shapes of CV curves are maintained as the scan rates increase from 5 to 60 mV s −1 , implying that the NiCo 2 Se 4 HMS electrode has a superior rate capability and remarkable electrochemical kinetics. The charge-discharge (GCD) curves at different current densities from 1 to 20 A g −1 in the potential range of 0.0 and 0.5 V are shown in Fig.…”

Nanostructure Nickel-Based Selenides as Cathode Materials for Hybrid Battery-Supercapacitors

“… Ye et al (2020b) prepared NiSe/ZnS hybrid nanostructured materials on the surface of nickel foam by co-electrodeposition. Subsequently, the influence of the ratio of Zn to Ni on the morphology and electrical properties of the material during the preparation process was studied.…”

“…This kind of heterogeneous interface material not only effectively prevents the agglomeration of 2D MoSe 2 nanosheets, but also acts as an ion buffer layer to protect the electrodes during charge and discharge. Ye et al (2020b) prepared NiSe/ZnS hybrid nanostructured materials on the surface of nickel foam by co-electrodeposition. Subsequently, the influence of the ratio of Zn to Ni on the morphology and electrical properties of the material during the preparation process was studied.…”