Design and Fabrication of Highly Porous 2D Bimetallic Sulfide ZnS/FeS Composite Nanosheets as an Advanced Negative Electrode Material for Supercapacitors

Abstract

Metal sulfides delivered much better electrochemical performance over metal oxides due to the extended potential window with high conductivity and therefore are much investigated in the field of energy storage applications. Herein, binder-free two-dimensional bimetallic (ZnS/FeS) interconnected composite nanosheet arrays are synthesized on carbon cloth (2D-ZFS@CC) as an innovative negative electrode material for supercapacitors. The 2D-ZFS@CC exhibits improved capacitance (1367.5 F g–1/1641 C g–1 at 3 A g–1), rate-capability (58.5% at 10-fold high current density), and capacitance retention (87%) over bimetallic oxide (ZnFe2O4). This is accomplished by intelligently regulating the morphology to generate numerous pores with a wide accessible surface area and high porosity, which favors high capacitance, whereas the binder-free nature of the active material promotes fast charge transfer characteristics. Moreover, the kinetic analysis suggested that the 2D-ZFS@CC electrode stored charge based on the hybrid charge storage mechanism with b values of 0.70 and 0.72 for anodic and cathodic peaks, respectively. These results demonstrate the significant potential application of 2D-ZFS@CC as a negative electrode material for next-generation supercapacitor electrodes.

Perspective of Vanadium Disulfide: A Rising Star Finds Plenty of Room in Single and Multielectron Energy Storage

“…Meanwhile, it can alleviate the lattice stress caused by volume expansion. 197 For example, Liang et al prepared an architecture of ultrathin nanoarray 1T-VS 2 on carbon cloths (VS 2 /CC). This structure can bypass the accumulation of nanoparticles and enhance room for volume expansion.…”

“…The preparation of integrated electrode can avoid blocking the transport channel of charge carriers on the electrode due to the random distribution of conductive agents, adhesives, and active materials on the electrode. Meanwhile, it can alleviate the lattice stress caused by volume expansion . For example, Liang et al prepared an architecture of ultrathin nanoarray 1T-VS 2 on carbon cloths (VS 2 /CC).…”

Recent Advances in Synthesis and Applications of Single‐Atom Catalysts for Rechargeable Batteries

“…Current commercially available Li‐ion batteries have several shortcomings such as low specific capacity and energy density. Despite the search for new energy storage devices including other metal‐ion batteries and supercapacitors, the modifications of the Li‐ion batteries are continued in the modern research era [199–208] . Thus SACs also have been utilized to enahce the performance of Li‐ion batteries, the main explored function of SACs is reported to make alloys with alkali metals and promoting the fast transfer of ions.…”

“…Despite the search for new energy storage devices including other metal-ion batteries and supercapacitors, the modifications of the Li-ion batteries are continued in the modern research era. [199][200][201][202][203][204][205][206][207][208] Thus SACs also have been utilized to enahce the performance of Li-ion batteries, the main explored function of SACs is reported to make alloys with alkali metals and promoting the fast transfer of ions. For example, Pt SACs with uniform dispersion of active sites and large surface area was reported to alloy with Li-ion to form PtÀ Li5 during charge/discharge process.…”

Flower-like Highly Open-Structured Binder-Free Zn-Co-Oxide Nanosheet for High-Performance Supercapacitor Electrodes

“…Pseudocapacitors (PCs) have a higher capacitance and energy density than EDLC-based SCs, but it is necessary to upgrade PCs before they can be used in real-world applications [ 6 ]. The redox reactions governed by the electrode material’s multiple oxidation states significantly impact the performance of PCs [ 7 ]. Designing nanostructured electrode materials for PC with high redox-active sites and improved performance is challenging.…”