Strategy for constructing highly stable supercapacitors: Channeling of thin-layer polyaniline to enhance pseudo-capacitance of the CuS/polyaniline@MoS2 composites

Dai, Juguo; Tang, Zhenbin; Lv, Yan; Xie, Hongmei; Zuo, Haiyan; Yang, Chang‐Fa; Wang, Xiaohong; Fan, Mizi; Xu, Yiting; Dai, Lizong

doi:10.1016/j.compscitech.2021.109240

Cited by 37 publications

(4 citation statements)

References 61 publications

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“…The high specific capacitance of a-MoS 2 -PANI also exceeds that of MoS 2 -based electrode materials reported in the literature (Figure 4e). [11,29,[39][40][41][42][43][44][45][46][47] In contrast, a-MoS 2 and PANI exhibit capacitance retention rates of 86.7% and 52.5%, respectively. Moreover, SEM measurements and XPS spectra (Figure S8, Supporting Information) show no significant change in the morphology of a-MoS 2 -PANI before and after the cycling test, further revealing its long-term cycling stability.…”

Section: Resultsmentioning

confidence: 99%

“…Nearly 90.13% of the initial capacitance is retained after the cycling test, considerably exceeding the capacitance retentions of previously reported supercapacitor devices (Table S3, Supporting Information). [29,42,44,51,52] The R s and R p values of the device obtained from the EIS plot before cycling are 1.8 and 4.92 Ω, respectively (Figure S10b, Supporting Information). After the cycling test, the resistance values estimated from the Nyquist plots slightly increase, possibly due to the loss of adhesion of the active materials on the current collector, which impedes ion diffusion.…”

Section: Electrochemical Performance Of A-mos 2 -Pani//ac Hybrid Devicementioning

confidence: 99%

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Covalently Interlayer‐Confined Organic–Inorganic Heterostructures for Aqueous Potassium Ion Supercapacitors

Chen

Liu

Cai

et al. 2022

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application, and the key challenge lies in the search for suitable electrode materials. Among the available electrode materials for supercapacitors, 2D transition-metal dichalcogenides are superior owing to their higher energy density compared to electric double-layer capacitor-type materials and higher power density compared to battery-type materials. [4] As an alternative, 2H MoS 2 with its good intercalation pseudocapacitive behavior has been extensively used, because its charging/ discharging process occurs not only at the electrode/electrolyte interface but also within the bulk of the material. [5,6] However, its limited interlayer spacing, inferior electrical conductivity, and large volume change upon cycling inevitably cause inferior pseudocapacitance and rapid electrochemical degradation, thus hindering its application in electrochemical energy storage.Recently, hybrid materials formed by assembling electroactive inorganic 2D materials with conducting organic polymers such as polyaniline (PANI), polypyrrole, and poly(3,4-ethylenedioxythiophene) have demonstrated great potential for electrochemical charge storage. [7][8][9] For example, the hybrid of 2H MoS 2 and PANI yielded better specific capacitance and cycling stability than 2H MoS 2 for supercapacitors through the synergistic effect of storing electrolyte ions of different compositions. [10,11] In particular, the electrical potential difference of different Artificial assembly of organic-inorganic heterostructures for electrochemical energy storage at the molecular level is promising, but remains a great challenge. Here, a covalently interlayer-confined organic (polyaniline [PANI])inorganic (MoS 2 ) hybrid with a dual charge-storage mechanism is developed for boosting the reaction kinetics of supercapacitors. Systematic characterizations reveal that PANI induces a partial phase transition from the 2H to 1T phases of MoS 2 , expands the interlayer spacing of MoS 2 , and increases the hydrophilicity. More in-depth insights from the synchrotron radiation-based X-ray technique illustrate that the covalent grafting of PANI to MoS 2 induces the formation of MoN bonds and unsaturated Mo sites, leading to increased active sites. Theoretical analysis reveals that the covalent assembly facilitates cross-layer electron transfer and decreases the diffusion barrier of K + ions, which favors reaction kinetics. The resultant hybrid material exhibits high specific capacitance and good rate capability. This design provides an effective strategy to develop organic-inorganic heterostructures for superior K-ion storage. The K-ion storage mechanism concerning the reversible insertion/extraction upon charge/discharge is revealed through ex situ X-ray photoelectron spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Performance Of A-mos 2 -Pani//ac Hybrid Devicementioning

confidence: 99%

Covalently Interlayer‐Confined Organic–Inorganic Heterostructures for Aqueous Potassium Ion Supercapacitors

Chen

Liu

Cai

et al. 2022

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“…High‐resolution TEM (HRTEM) analysis of the MoS 2 @PANI sample showed the presence of both trigonal and hexagonal atomic‐scale crystalline ordering corresponding to the 1T and 2H phases of MoS 2 , respectively (Figure 1k). [ 16 ] Besides, numerous defects can be found in MoS 2 @PANI composites, as marked with red circles in Figure 1k. The selected‐area electron diffraction (SAED) patterns of MoS 2 @PANI display the Debye–Scherrer rings associated with (002), (103), and (110) plane families of the MoS 2 2H phase (Figure 1l).…”

Section: Resultsmentioning

confidence: 99%

MoS₂@Polyaniline for Aqueous Ammonium‐Ion Supercapacitors

Dai

Yang

et al. 2023

Advanced Materials

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Ammonium‐ion aqueous supercapacitors are raising notable attention owing to their cost, safety, and environmental advantages, but the development of optimized electrode materials for ammonium‐ion storage still lacks behind expectations. To overcome current challenges, here, a sulfide‐based composite electrode based on MoS2 and polyaniline (MoS2@PANI) is proposed as an ammonium‐ion host. The optimized composite possesses specific capacitances above 450 F g−1 at 1 A g−1, and 86.3% capacitance retention after 5000 cycles in a three‐electrode configuration. PANI not only contributes to the electrochemical performance but also plays a key role in defining the final MoS2 architecture. Symmetric supercapacitors assembled with such electrodes display energy densities above 60 Wh kg−1 at a power density of 725 W kg−1. Compared with Li+ and K+ ions, the surface capacitive contribution in NH4+‐based devices is lower at every scan rate, which points to an effective generation/breaking of H‐bonds as the mechanism controlling the rate of NH4+ insertion/de‐insertion. This result is supported by density functional theory calculations, which also show that sulfur vacancies effectively enhance the NH4+ adsorption energy and improve the electrical conductivity of the whole composite. Overall, this work demonstrates the great potential of composite engineering in optimizing the performance of ammonium‐ion insertion electrodes.

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“…MoS 2 nanosheets were used as a conductive package to protect the internal active material from damage during charging/discharging and improve the structural integrity and stability of the material through three-dimensional conductive cladding. Dai et al [ 97 ] used hollow CuS nanocages on polyaniline (PANI) nanolayers coated on the surface. Subsequently, they prepared a MoS 2 conductive cladding layer by using a hydrothermal method, and the CuS/PANI@MoS 2 composites were developed.…”

Section: Copper–sulfur Composite With Other Materials In Scmentioning

confidence: 99%

Application of Copper–Sulfur Compound Electrode Materials in Supercapacitors

Lu,

Jiang,

Guo

et al. 2024

Molecules

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Supercapacitors (SCs) are a novel type of energy storage device that exhibit features such as a short charging time, a long service life, excellent temperature characteristics, energy saving, and environmental protection. The capacitance of SCs depends on the electrode materials. Currently, carbon-based materials, transition metal oxides/hydroxides, and conductive polymers are widely used as electrode materials. However, the low specific capacitance of carbon-based materials, high cost of transition metal oxides/hydroxides, and poor cycling performance of conductive polymers as electrodes limit their applications. Copper–sulfur compounds used as electrode materials exhibit excellent electrical conductivity, a wide voltage range, high specific capacitance, diverse structures, and abundant copper reserves, and have been widely studied in catalysis, sensors, supercapacitors, solar cells, and other fields. This review summarizes the application of copper–sulfur compounds in SCs, details the research directions and development strategies of copper–sulfur compounds in SCs, and analyses and summarizes the research hotspots and outlook, so as to provide a reference and guidance for the use of copper–sulfur compounds.

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Strategy for constructing highly stable supercapacitors: Channeling of thin-layer polyaniline to enhance pseudo-capacitance of the CuS/polyaniline@MoS2 composites

Cited by 37 publications

References 61 publications

Covalently Interlayer‐Confined Organic–Inorganic Heterostructures for Aqueous Potassium Ion Supercapacitors

Covalently Interlayer‐Confined Organic–Inorganic Heterostructures for Aqueous Potassium Ion Supercapacitors

MoS₂@Polyaniline for Aqueous Ammonium‐Ion Supercapacitors

Application of Copper–Sulfur Compound Electrode Materials in Supercapacitors

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Strategy for constructing highly stable supercapacitors: Channeling of thin-layer polyaniline to enhance pseudo-capacitance of the CuS/polyaniline@MoS2 composites

Cited by 37 publications

References 61 publications

Covalently Interlayer‐Confined Organic–Inorganic Heterostructures for Aqueous Potassium Ion Supercapacitors

Covalently Interlayer‐Confined Organic–Inorganic Heterostructures for Aqueous Potassium Ion Supercapacitors

MoS2@Polyaniline for Aqueous Ammonium‐Ion Supercapacitors

Application of Copper–Sulfur Compound Electrode Materials in Supercapacitors

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MoS₂@Polyaniline for Aqueous Ammonium‐Ion Supercapacitors