Carbon-coated WS<sub>2</sub> nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors

Geng, Shitao; Zhou, Tong; Jia, Minyu; Shen, Xiangyan; Gao, Peibo; Tian, Shuang; Zhou, Pengfei; Liu, Bo; Zhuo, Shuping; Li, Feng

doi:10.1039/d1ee00193k

Cited by 124 publications

(104 citation statements)

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“…[17,18] Among various kinds of anode materials, transition-metal dichalcogenides (TMDs) (e.g., MoS 2 , FeS 2 , NiS 2 , and CoS 2 ) have attracted much interest because of their high theoretical capacity, strong redox reversibility as well as weak metal-S bond that is beneficial to conversion reactions. [19][20][21][22] As typical TMDs anodes, nickel sulfides (NiS x ) and cobalt sulfides (CoS x ) with much richer electrochemical activities are regarded as very promising materials for PIBs. [23][24][25][26][27] For instance, Wu et al designed the anode of α-NiS coated with the reduced graphene oxide (α-NiS/rGO), which achieved high reversible capacity of 426 mAh g -1 after 500 cycles at 0.5 A g -1 .…”

Section: Introductionmentioning

confidence: 99%

An Open‐Ended Ni₃S₂–Co₉S₈ Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

et al. 2022

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Sulfides are perceived as promising anode materials for potassium‐ion batteries (PIBs) due to their high theoretical specific capacity and structural diversity. Nonetheless, the poor structural stability and sluggish kinetics of sulfides lead to unsatisfactory electrochemical performance. Herein, Ni3S2–Co9S8 heterostructures with an open‐ended nanocage structure wrapped by reduced graphene oxide (Ni‐Co‐S@rGO cages) are well designed as the anode for PIBs via a selective etching and one‐step sulfuration approach. The hollow Ni‐Co‐S@rGO nanocages, with large surface area, abundant heterointerfaces, and unique open‐ended nanocage structure, can reduce the K+ diffusion length and promote reaction kinetics. When used as the anode for PIBs, the Ni‐Co‐S@rGO exhibits high reversible capacity and low capacity degradation (0.0089% per cycle over 2000 cycles at 10 A g–1). A potassium‐ion full battery with a Ni‐Co‐S@rGO anode and Prussian blue cathode can display a superior reversible capacity of 400 mAh g–1 after 300 cycles at 2 A g–1. The unique structural advantages and electrochemical reaction mechanisms of the Ni‐Co‐S@rGO are revealed by finite‐element‐simulation in situ characterizations. The universal synthesis technology of bimetallic sulfide anodes for advanced PIBs may provide vital guidance to design high‐performance energy‐storage materials.

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Section: Introductionmentioning

confidence: 99%

An Open‐Ended Ni₃S₂–Co₉S₈ Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

et al. 2022

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“…Through a conversion process involving four K + per WS 2 to form W and K 2 S with full potassiation, WS 2 can deliver a high theoretical capacity of 431.6 mAh g –1 . Recently, Geng et al designed carbon-coated WS 2 supported on carbon nanofibers (denoted as C-WS 2 @CNFs) as a freestanding anode for KICs. They performed in situ measurements to clarify the electrochemical reaction mechanism between WS 2 and K + .…”

Section: Battery-type Anode Materialsmentioning

confidence: 99%

“…Recently, Geng et al designed carbon-coated WS 2 supported on carbon nanofibers (denoted as C-WS 2 @CNFs) as a freestanding anode for KICs. They performed in situ measurements to clarify the electrochemical reaction mechanism between WS 2 and K + . The Raman spectra showed a pronounced blue shift at 0.88 V vs K/K + during the initial discharge process (Figure a).…”

Section: Battery-type Anode Materialsmentioning

confidence: 99%

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Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

et al. 2021

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Potassium ion energy storage devices are competitive candidates for grid-scale energy storage applications owing to the abundancy and cost-effectiveness of potassium (K) resources, the low standard redox potential of K/K+, and the high ionic conductivity in K-salt-containing electrolytes. However, the sluggish reaction dynamics and poor structural instability of battery-type anodes caused by the insertion/extraction of large K+ ions inhibit the full potential of K ion energy storage systems. Extensive efforts have been devoted to the exploration of promising anode materials. This Review begins with a brief introduction of the operation principles and performance indicators of typical K ion energy storage systems and significant advances in different types of battery-type anode materials, including intercalation-, mixed surface-capacitive-/intercalation-, conversion-, alloy-, mixed conversion-/alloy-, and organic-type materials. Subsequently, host–guest relationships are discussed in correlation with the electrochemical properties, underlying mechanisms, and critical issues faced by each type of anode material concerning their implementation in K ion energy storage systems. Several promising optimization strategies to improve the K+ storage performance are highlighted. Finally, perspectives on future trends are provided, which are aimed at accelerating the development of K ion energy storage systems.

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“…Particularly, tungsten disulfide (WS 2 ) and molybdenum disulfide (MoS 2 ), which belong to the 2D-TMD group, have received considerable attention, especially in the field of hydrogen evolution reaction (HER) electrocatalysts owing to their desirable electrochemical properties 2 . Based on theoretical and empirical research, the S-edges of 2H-MoS 2 and 2H-WS 2 with semiconductor properties, play an essential role in the catalytic reaction rather than the inert (0001) basal planes 3 , 4 . 2H-TMD need to increase the number of active sites that exhibit favorable adsorption of hydrogen ions dissolved in the acidic solution.…”

Section: Introductionmentioning

confidence: 99%

Activation of nitrogen species mixed with Ar and H2S plasma for directly N-doped TMD films synthesis

Cho

Seok

Lee

et al. 2022

Sci Rep

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Among the transition metal dichalcogenides (TMD), tungsten disulfide (WS2) and molybdenum disulfide (MoS2) are promising sulfides for replacing noble metals in the hydrogen evolution reaction (HER) owing to their abundance and good catalytic activity. However, the catalytic activity is derived from the edge sites of WS2 and MoS2, while their basal planes are inert. We propose a novel process for N-doped TMD synthesis for advanced HER using N2 + Ar + H2S plasma. The high ionization energy of Ar gas enabled nitrogen species activation results in efficient N-doping of TMD (named In situ-MoS2 and In situ-WS2). In situ-MoS2 and WS2 were characterized by various techniques (Raman spectroscopy, XPS, HR-TEM, TOF–SIMS, and OES), confirming nanocrystalline and N-doping. The N-doped TMD were used as electrocatalysts for the HER, with overpotentials of 294 mV (In situ-MoS2) and 298 mV (In situ-WS2) at a current density of 10 mA cm−2, which are lower than those of pristine MoS2 and WS2, respectively. Density functional theory (DFT) calculations were conducted for the hydrogen Gibbs energy (∆GH) to investigate the effect of N doping on the HER activity. Mixed gas plasma proposes a facile and novel fabrication process for direct N doping on TMD as a suitable HER electrocatalyst.

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Carbon-coated WS₂ nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors

Abstract: Potassium-ion capacitors (PICs) have received increasing attention because of their high energy/power densities and the abundance of potassium. However, achieving high-rate battery-type anode to match the capacitor-type cathode is still...

Cited by 124 publications

References 60 publications

An Open‐Ended Ni₃S₂–Co₉S₈ Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

An Open‐Ended Ni₃S₂–Co₉S₈ Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

Activation of nitrogen species mixed with Ar and H2S plasma for directly N-doped TMD films synthesis

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Carbon-coated WS2 nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors

Abstract: Potassium-ion capacitors (PICs) have received increasing attention because of their high energy/power densities and the abundance of potassium. However, achieving high-rate battery-type anode to match the capacitor-type cathode is still...

Cited by 124 publications

References 60 publications

An Open‐Ended Ni3S2–Co9S8 Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

An Open‐Ended Ni3S2–Co9S8 Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

Activation of nitrogen species mixed with Ar and H2S plasma for directly N-doped TMD films synthesis

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Product

Resources

About

Carbon-coated WS₂ nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors

An Open‐Ended Ni₃S₂–Co₉S₈ Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries

An Open‐Ended Ni₃S₂–Co₉S₈ Heterostructures Nanocage Anode with Enhanced Reaction Kinetics for Superior Potassium‐Ion Batteries