A single-step synthesis and direct growth of microspheres containing the nanoflakes-like structure of Zn0.76Co0.24S as a high-performance electrode for supercapacitors

Attia, Sayed Y.; Barakat, Yosry F.; Hassan, Hamdy H.; Mohamed, Saad G.

doi:10.1016/j.est.2020.101349

Cited by 46 publications

(10 citation statements)

References 56 publications

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“…Peak deconvolution was performed using a Gaussian fitting method based on the Shirley background correction. Figure 2b displays the highresolution spectrum of Zn 2p, in which two pronounced peaks appeared at binding energies of 1044.5 and 1021.5 eV, corresponding to Zn 2p1/2 and Zn 2p3/2, proving the presence of Zn 2+ ion [39]. From the XPS results, the chemical composition of the ZnCo2S4 included Zn 2 + , Co 2+ , Co 3 + , and S 2− .…”

Section: X-ray Photoelectron Spectroscopic Of Znco2s4/nfmentioning

confidence: 94%

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

Elsaid

Sayed²,

Ashmawy³

et al. 2022

The Bulletin Tabbin Institute for Metallurgical Studies (TIMS)

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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.

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Section: X-ray Photoelectron Spectroscopic Of Znco2s4/nfmentioning

confidence: 94%

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

Elsaid

Sayed²,

Ashmawy³

et al. 2022

The Bulletin Tabbin Institute for Metallurgical Studies (TIMS)

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“…For a two-electrode system, the specific power ( P d ) and specific energy ( E d ) can be calculated using the following equations, respectively. 29,30 …”

Section: Methodsmentioning

confidence: 99%

Li₂Mn_0.8Ni_0.2SiO₄/MnO₂ nanocomposite for high-performance supercapacitor applications

et al. 2023

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“…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 5a), 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.…”

Section: Characterizationmentioning

confidence: 97%

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

Mohamed,

Morad,

Siddiqui

et al. 2023

Adv Materials Inter

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The rational design of heterostructured Fe‐doped ZnS microspheres (FeZnS‐MS) and their use as electrode materials for supercapacitors (SCs) is proposed. FeZnS‐MS are mounted on a Ni foam substrate to develop high‐activity positive electrodes for SCs. The morphological and electrochemical performances of the hydrothermally synthesized FeZnS‐MS are investigated, revealing the formation of microspherical Fe‐doped ZnS nanocubes. Different Fe ratios (0.1, 0.2, and 0.3) are successfully introduced to ZnS without impurities, whereas two phases are produced when the percentage is increased to 0.4. Notably, under a current density of 2 A g−1, the Zn0.7Fe0.3S nanocomposite showed an exceptional specific capacitance of 575 F g−1, compared to the moderate value (200 F g−1) achieved by ZnS. At 0.5 and 1 A g−1, the Zn0.7Fe0.3S electrode presented an even better specific capacitance of 700 and 604.5 F g−1, respectively. Using this electrode, a hybrid supercapacitor system is developed and delivered 11 Wh kg−1 and a high specific power of 591.2 W kg−1.

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A single-step synthesis and direct growth of microspheres containing the nanoflakes-like structure of Zn0.76Co0.24S as a high-performance electrode for supercapacitors

Cited by 46 publications

References 56 publications

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

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

Li₂Mn_0.8Ni_0.2SiO₄/MnO₂ nanocomposite for high-performance supercapacitor applications

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

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A single-step synthesis and direct growth of microspheres containing the nanoflakes-like structure of Zn0.76Co0.24S as a high-performance electrode for supercapacitors

Cited by 46 publications

References 56 publications

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

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

Li2Mn0.8Ni0.2SiO4/MnO2 nanocomposite for high-performance supercapacitor applications

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

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Li₂Mn_0.8Ni_0.2SiO₄/MnO₂ nanocomposite for high-performance supercapacitor applications