A General Equivalent Electrical Circuit Model for the characterization of MXene/graphene oxide hybrid-fiber supercapacitors by electrochemical impedance spectroscopy – Impact of fiber length

Mainka, Julia; Gao, Wei; He, Nanfei; Dillet, Jérôme; Lottin, Olivier

doi:10.1016/j.electacta.2021.139740

Cited by 26 publications

(6 citation statements)

References 46 publications

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“…9d) in the low-frequency zone is characteristic of an ion-diffusion process at the electrode/electrolyte interface, known as the Warburg diffusion line. 53 The higher slope of the line for the crGO–Mo 2 VW 9 nanocomposite compared with the prGO–Mo 2 VW 9 represents a decrease in mass transfer resistance, indicating a more capacitive nature. The semicircular arch in the high-frequency region shows a lower R s with a transfer resistance of 0.82 and 14.1 Ω.…”

Section: Resultsmentioning

confidence: 99%

Waste dry cell derived photo-reduced graphene oxide and polyoxometalate composite for solid-state supercapacitor applications

Maity,

Biradar,

Srivastava

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

Waste dry cell derived photo-reduced graphene oxide and polyoxometalate composite for solid-state supercapacitor applications

Maity,

Biradar,

Srivastava

et al. 2023

Phys. Chem. Chem. Phys.

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“…To further verify this mechanism, the impedance spectra and the corresponding equivalent circuit of the boron/MXene composite with different mass ratios are given in Figure b. The equivalent circuit comprises a series connection of the bulk resistance and the interface impedance, and the interface impedance consists of a parallel connection of a resistance ( R ) and a capacitance ( C ) at the interface. − In the equivalent circuit shown in Figure b, R s represents the solution resistance and electrode resistance, R ct represents the charge transfer resistance between active materials, CPE is a constant phase angle element associated with double-layer capacitance, and Z w is the Warburg impedance, related to the diffusion process of ions or carriers at the sensing film/electrode interface . In addition, R 1 and C 1 refer to the interface resistance and capacitance between the materials and the solution, respectively.…”

Section: Resultsmentioning

confidence: 99%

Boron/MXene Hollow Spheres for Humidity Sensing and Respiration Monitoring

Zhang,

Dong,

Dong

et al. 2024

ACS Appl. Nano Mater.

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Boron nanosheets with high surface hydrophilicity and proton conductivity are promising for ionic devices. However, their poor electrical conductivity has severely limited their applications in resistive-type electronic devices. Herein, electrically conductive three-dimensional boron/MXene hollow spheres were prepared by a freeze-drying-assisted self-assembly method. The composites were fabricated into resistive-type humidity sensors, which showed high sensitivity with a three-orders-of-magnitude variation in resistance, a wide detection range (11−97%), fast response and recovery time (4 s/3.8 s), and long-term stability. The excellent humidity sensing performance can be attributed to the abundant hydrophilic groups on both the inner and outer surfaces of open spheres as well as to a coupled hole/proton conducting process. As a proof of concept, real-time remote monitoring of human respiration was achieved by integrating our humidity sensor with a Bluetooth module, enabling differentiation of breathing frequency as rapid as 0.8 s.

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“…The semicircle size is relevant to the charge transfer impedance (Rct) of the redox reaction on the interface of electrode material. In the low-frequency region, the slash slope was determined by the Warburg impedance (W) generated from ion diffusion in the electrolyte [ 45 , 46 ]. According to the test results, the charge transfer resistances (Rct) in the high-frequency region were 14.6 Ω sample C1), 18.8 Ω (sample C2), and 26.9 Ω (sample C3), respectively, proving that sample C1 presents a fast electron transfer capacity during the electrochemical process.…”

Section: Resultsmentioning

confidence: 99%

Facile Solid-State Chemical Synthesis of CoMoO4 Nanorods for High-Performance Supercapacitors

Yu,

Lu,

et al. 2024

Molecules

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The development of electrode materials with excellent performance serves as the key for researchers to enhance the energy density of supercapacitors. Cobalt molybdate (CoMoO4) nanomaterials have been regarded as one of the most prospective electrode materials for supercapacitors due to their high theoretical capacitance and excellent electrical conductivity. In this paper, three kinds of CoMoO4 nanorods were prepared directly via simple and environmentally friendly solid-phase chemical reactions with solid inorganic salts as raw materials. According to X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) test results, different reagents had certain effects on the size and morphology of CoMoO4, and these affected its electrochemical performance. In particular, the samples prepared with Co(NO3)2·6H2O as raw material took on a more uniform micromorphology, with a better crystallinity. Simultaneously, electrochemical test results showed that the samples synthesized with Co(NO3)2·6H2O presented relatively good electrical conductivity and a large specific capacitance (177 F g−1). This may be due to the nitrates reacting more slowly during the reaction and the crystals having difficulty aggregating during growth. Therefore, the structure of the prepared CoMoO4 nanomaterial was more uniform, and it was resistant to collapse during the charging and discharging process; thus, the capacitor presents the best performance.

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A General Equivalent Electrical Circuit Model for the characterization of MXene/graphene oxide hybrid-fiber supercapacitors by electrochemical impedance spectroscopy – Impact of fiber length

Cited by 26 publications

References 46 publications

Waste dry cell derived photo-reduced graphene oxide and polyoxometalate composite for solid-state supercapacitor applications

Waste dry cell derived photo-reduced graphene oxide and polyoxometalate composite for solid-state supercapacitor applications

Boron/MXene Hollow Spheres for Humidity Sensing and Respiration Monitoring

Facile Solid-State Chemical Synthesis of CoMoO4 Nanorods for High-Performance Supercapacitors

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