Hierarchically Nanocoral Reefs-like ZnCo2S4 Deposited on Ni Foam as an Electrode Material for High-Performance Battery-type Symmetric Supercapacitor

Abstract

The target for developing electrode materials with unique architecture and tailored composition is essential for influencing their electrochemical properties. The innovative porous zinc cobalt sulfide (ZnCo2S4/ Ni foam (NF)) nanocoral reef-like structure supported by 3D NF is fabricated by the hydrothermal method. Here is an advanced electrode for supercapacitors (SCs), which demonstrates the notable electrochemical performance of the electrode in terms of the specific capacity of 2055.2 C g -1 (specific capacitance of 1957.4 F g -1 ) at 1 A g -1 and excellent cyclic stability of 89.2% capacity retention and 98% coulombic efficiency after 5000 cycles. Furthermore, the battery-type symmetric supercapacitors based on ZCS/NF have an ultrahigh energy density of 39.1 Wh kg -1 at a power density of 1637 W kg -1 with excellent cyclic stability, 93.3% capacity retention, and 100% coulombic efficiency after 6000 cycles. The outstanding characteristics can be attributed to the synergistic contribution of the ZnCo2S4/NF coral reef hierarchical architecture and the bimetallic sulfide with great valence states for rich redox reactions. Therefore, the nano coral reef ZnCo2S4/NF is promising electrode material for battery-type supercapacitors.

Improving the Electrochemical Performance of Zinc Sulfides by Iron Doping Toward Supercapacitor Applications

“…Two binding energies at 1045 and 1022 eV, which are attributed to Zn 2p 1/2 and Zn 2p 3/2 , can be seen in the spectra of Zn 2p ( Figure a), demonstrating the existence of the Zn 2+ ion. [ 28,29 ] According to Figure 5b, Fe 2+ is indexed to the appropriate peaks of Fe 2p at 710.4 and 722.2 eV, while Fe 3+ is indexed to the Fe 2p peaks at 716.1 and 726.2 eV, showing the existence of both Fe 3+ and Fe 2+ cations in Zn 0.7 Fe 0.3 S. [ 30 ] Two deconvoluted peaks were observed in the S 2p spectrum (Figure 5c). The sulfur‐metal bonds (Zn‐S and Fe‐S) were attributed to the binding energy of S 2p 3/2 (161.2 eV); also, S 2− with low numbers of coordination on the surface were assigned the binding energy of S 2p 1/2 at 162.5 eV.…”

Animal- and Human-Inspired Nanostructures as Supercapacitor Electrode Materials: A Review

“…The construction and design of 1D nanoarchitecture and the flexibility of binder-free electrode material have shown great interest for electrode fabrication. The practical capacitance and stability of the metal oxide greatly depend on the composition, synthesis condition, and morphology of the structure [43,63,112,113,114,115,116,117]. Manikandan et al [118] designed binder-free vanadium oxide spider web-like nanostructure by using facile in situ hydrothermal technique for SSC devices.…”

Preparation of Perovskite-type ZnSnO3 nanoparticles and enhancing their behavior as a positive electrode for supercapacitor applications

“…Great efforts of green energy devices and researchers have been made to overcome the ever-growing energy crisis and environmental pollution by converting environmental waste into useful material for energy storage systems such as supercapacitors [1][2][3][4][5][6]. Electrochemical energy storage devices are classified into electrochemical double-layer capacitors (EDLCs), Pseudocapacitors, and hybrid capacitors [7][8][9]. Currently, most of the research focuses on supercapacitors to obtain advanced electrode materials with higher specific capacitance and more extended cycling stability, as an essential ternary semiconducting oxide, mostly ABO3 type (ZnSnO3), has been attracting most of the studies due to its different applications in various fields, such as gas sensor [10,11], photo-catalyst [12], and lithium-ion batteries [13].…”