Effect of fluorine doping and sulfur vacancies of CuCo2S4 on its electrochemical performance in supercapacitors

Lee, Kang; Huang, Chen‐Hung; Zhang, Jian; Zhang, Mengyao; Zhang, Nan; Liu, Shude; Yan, Yunjun; Luo, Chen; Gong, Zhiwei; Wang, Chaolun; Zhou, Xiaofeng; Wu, Xing‐Long

doi:10.1016/j.cej.2020.124643

Cited by 158 publications

(80 citation statements)

References 60 publications

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“…Previous density functional theory and experimental investigations have shown that substituting F − for S 2− can facilitate the rate of electron transfer because of the generation of defect levels and the reduced band gap. [9,10] Thus, we anticipated that increased electronic conductivity could be achieved for F-2 after F − doping compared with F-0, and it would contribute to the regulation of EM parameters and dielectric loss. Other than F − doping, another aspect of F − introduction is the ability to produce multiple phases and multiple-component heterointerfaces.…”

Section: The Role Of In Situ F − Regulation Engineering On the Interf...mentioning

confidence: 99%

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

Liu

Zhang

2021

Adv Funct Materials

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Fluorine ion (F − ) regulation engineering rarely has been presented as a promising strategy for obtaining high-performance electromagnetic wave (EMW) absorbing materials, and the related EMW attenuation mechanism has never been elucidated. Herein, a new F − regulation strategy is demonstrated for the first time, giving rise to broad low-/middle-frequency EMW attenuation by synergistically manipulating multiple factors, such as the morphology, composition, interface, defects, and conductivity. It is found that both the F − concentration and its introduction method (i.e., in situ or post-treatment) are significant. Because of the in situ introduced heterointerfaces, the enriched defects, appropriate composition, and electronic conductivity, improvements in impedance matching and F − -regulated dielectric loss are simultaneously achieved. Accordingly, the optimized NiCo 2 S 4 /Co 1−x S/Co(OH)F composite delivered an effective absorption band of 6.03 GHz (4.57-10.60 GHz), which is five times higher than the pure counterpart, making it the only sulfidebased absorber with a broad absorption feature toward the low frequency (from 4 GHz) with a small thickness (<3 mm) to date. In short, this work not only expounds on the unique roles of F − in chemical synthesis, microstructure design, and EMW absorption but also offers a viable strategy for solving the low-/middle-frequency EM interference issues through F − regulation engineering.

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Section: The Role Of In Situ F − Regulation Engineering On the Interf...mentioning

confidence: 99%

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

Liu

Zhang

2021

Adv Funct Materials

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“…[37] S vacancies are in favor of improving the electrochemical redox reaction and enhancing the electrical conductivity of metal sulfides. [38] X-ray photoelectron spectroscopy (XPS) is used to verify the chemical composition and valence of the CoNi 2 S 4 /NF-0.5 and PA-CoNi 2 S 4 /NF-6h samples. The XPS spectrum of PA-CoNi 2 S 4 / NF-6h indicates the existence of Ni, Co, and S elements (Figure S8, Supporting Information), and the corresponding molar ratios are 66.46%, 21.94%, and 11.60%, respectively.…”

Section: Resultsmentioning

confidence: 99%

From Crystalline to Partially Amorphous: A Facile Strategy toward Sulfur Vacancy‐Enriched CoNi₂S₄ Nanosheets with Improved Supercapacitor Performance

Peng

Zhang

et al. 2021

Advanced Sustainable Systems

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fossil fuels and avoiding further environmental pollution. [4,5] To date, a variety of EES devices have been developed. In addition to the lithium-ion battery, some new energy storage devices, including zinc-ion batteries (ZIBs), dual-ion batteries (DIBs), lithium-sulfur batteries (LSBs), and supercapacitors (SCs), have sprung up. [6][7][8][9] Among them, SCs deliver superior power density (>10 kW kg -1 ), long cyclic stability (>10 4 cycles), and fast reversible charge/ discharge process (within seconds), which make them the leading force in EES devices. [10] For SCs, appropriate electrode materials are in favor of improving their electrochemical performances. Thus, it is a crucial demand for choosing cathode materials with excellent electrochemical properties. [11] Transition metal sulfides (cobalt sulfide, molybdenum sulfide, vanadium sulfide, nickel sulfide, manganese sulfide, etc.) are explored for their striking electrochemical properties. [12][13][14][15][16] They possess rich redox activities and thus produce high specific capacitances. [17] Nickel sulfide and cobalt sulfide are the most prominent in the alkaline system among them. Also, the electrochemical contributions from metal ions in the multi-metal sulfides can provide richer redox reactions than that of the single-metal sulfides, leading to better EES properties. [18] Therefore, cobalt-nickel sulfides are commonly used as battery-type faradaic electrode materials of SCs. [19] However, the practical application of bulky cobalt-nickel sulfides has been limited by their low specific capacitance and poor cyclic stability owing to relatively low available specific surface area. [20] Therefore, these bulky materials urgently need to be designed for more efficient utilization, such as improving surface area and increasing intrinsic conductivity.The effective design for optimizing available surface area is to control the morphology and structure of cobalt-nickel sulfides (nanotubes, nanourchins, nanosheets, nanocubes, and nanoflowers), which has been widely applied in EES. [21][22][23][24][25] Among them, well-defined cobalt-nickel sulfides nanosheets have been widely concerned owing to the shorten ion diffusion path and the enlarged surface area. [26] In addition, the effective method to increase conductivity is compositing cobalt-nickel sulfides with carbon materials. Nevertheless, the prepared materials are Supercapacitors (SCs) are considered to be a promising energy storage technology due to their superior electrochemical properties. However, to meet the continuously rising demands of energy density,

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“…Thus, due to a lack of enough intrinsic HER sites and sluggish transfer kinetics of the photoexcited electrons and holes, the pure ZIS photocatalyst exhibits unsatisfactory photocatalytic activity for HER which is far below the expectation [16][17][18]. Subsequently, a vast number of strategies have been proposed to activate the inert basal plane for more reaction sites and further improve the photocatalytic activity of ZIS, such as elements doping [16,19] and co-catalysts loading [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic H2 evolution over sulfur vacancy-rich ZnIn2S4 hierarchical microspheres under visible light

Jiang

Cai

et al. 2021

J Mater Sci

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In this work, the sulfur vacancies were successfully introduced into the ZnIn 2 S 4 (ZIS) lattice through two facile approaches, plasma etching and annealing, for enhancing the photocatalytic performance. The optimized plasma-etched ZIS exhibited an enhanced H 2 generation rate of 706 lmol g -1 h -1 , which was 5 and 1.2 times higher than that of pure ZIS and annealed ZIS, respectively. Theoretical calculation demonstrated that surface S vacancy could arouse the catalytic activity of the adjacent S atoms in inert (001) basal plane, serving as the active site for hydrogen evolution reaction (HER). Although annealing could produce much more S vacancies than the plasma etching, a majority of bulk S vacancies usually acted as charge recombination center to lower the photocatalytic activity. Hence, even plasma-etched ZIS presented poor light absorption capacity, plasma etching showed a better effect on the HER improvement of ZIS than annealing. This work presents a simple and promising pathway for optimization of 3D ZIS photocatalysts to improve photocatalytic hydrogen evolution.

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Effect of fluorine doping and sulfur vacancies of CuCo2S4 on its electrochemical performance in supercapacitors

Cited by 158 publications

References 60 publications

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

From Crystalline to Partially Amorphous: A Facile Strategy toward Sulfur Vacancy‐Enriched CoNi₂S₄ Nanosheets with Improved Supercapacitor Performance

Photocatalytic H2 evolution over sulfur vacancy-rich ZnIn2S4 hierarchical microspheres under visible light

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Effect of fluorine doping and sulfur vacancies of CuCo2S4 on its electrochemical performance in supercapacitors

Cited by 158 publications

References 60 publications

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F− Regulation Engineering

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F− Regulation Engineering

From Crystalline to Partially Amorphous: A Facile Strategy toward Sulfur Vacancy‐Enriched CoNi2S4 Nanosheets with Improved Supercapacitor Performance

Photocatalytic H2 evolution over sulfur vacancy-rich ZnIn2S4 hierarchical microspheres under visible light

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Product

Resources

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Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

Enhancing the Low/Middle‐Frequency Electromagnetic Wave Absorption of Metal Sulfides through F⁻ Regulation Engineering

From Crystalline to Partially Amorphous: A Facile Strategy toward Sulfur Vacancy‐Enriched CoNi₂S₄ Nanosheets with Improved Supercapacitor Performance