Dielectric properties of a single nanochannel investigated by high-frequency impedance spectroscopy

Gamby, Jean; Delapierre, François-Damien; Pallandre, Antoine; Tribollet, Bernard; Deslouis, C.; Haghiri‐Gosnet, A. M.

doi:10.1016/j.elecom.2016.02.011

Cited by 6 publications

(13 citation statements)

References 29 publications

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“…After Ce-doped, the time constant was decreased (τ = 1/ω*), indicating fast surface redox reaction. 25,26 According to the above results, we concluded that Ce-doped MnO 2 not only increased the specific capacitance but also optimized the electron and ion transfer/diffusion.…”

Section: ■ Introductionmentioning

confidence: 73%

Phase Transformation of Ce³⁺-Doped MnO₂ for Pseudocapacitive Electrode Materials

2016

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Doping is one of the important methods to modify the physical and chemical properties of functional materials, which can be used to synthesize mixed ionic and electronic conducting metal oxides. Herein, the phase transformation of MnO2 from β- to α-phase has been proven by doping Ce3+ ions. With the increase of the amount of Ce3+ ions, the sizes of MnO2 nanorods were first decreased to 10–20 nm, then increased to 70 nm. The capacitive performance indicated that the specific capacitance of Ce-doped MnO2 electrode materials increased 10-fold compared with undoped MnO2, while the charge transfer resistance of Ce-doped MnO2 decreased. The present results show that rare earth ions can be used as a promising dopant to modify the crystallization behavior and electrochemical performance of MnO2 electrode materials.

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Section: ■ Introductionmentioning

confidence: 73%

Phase Transformation of Ce³⁺-Doped MnO₂ for Pseudocapacitive Electrode Materials

2016

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“…As the height of the nanochannel, hn, is very small (a hundred nanometers), the EDL thickness may become not negligible and affects the total conductance. Indeed, if λD < h/2, the nanochannel conductance [29], [34], [36], is governed by its bulk conductance expression defined as follows,…”

Section: The Simplified Nanochannel Conductance Modelmentioning

confidence: 99%

“…Indeed, as we mentionned previously, several studies already exist on nanochannel conductance but they either involve even unique nanochannel length due to long micro nanofabrication process or time consuming for an experimental characterization [34]. It thus should be interesting to investigate the role played by the nanochannel length and its connected microchannels to contribute on the improvement of the models for conductance laws proposed in the literature.…”

Section: Introductionmentioning

confidence: 98%

Modeling the role played by nanoslit lengths on conductance changes into micro nano microfluidics devices

Ngom

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Haghiri‐Gosnet

et al. 2021

Electrochimica Acta

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“…The frequency range used for HFEIS measurements was varied from 10 MHz to 1 Hz. The sinusoidal AC signal excitation between Ag|AgCl wires is set to 100 mV peak to peak since DC was fixed to 0 V. 40 Experimental Protocols. To measure the global MNM conductance, the procedure described below was followed for various concentrations of the supporting electrolyte.…”

Section: ■ Introductionmentioning

confidence: 99%

Influence of Lanthanum on Stern Layer Conductance in the Nanochannel

et al. 2023

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In this report, high-frequency electric impedance spectroscopy was performed to investigate ionic transport through nanochannels. Special attention was focused on (i) conductance behaviors depending on the role of cation valence in three background electrolytes (XCln): monovalent 1-1 (K + and Cl − ), divalent 2-1 (Mg 2+ and 2Cl − ), and trivalent 3-1 (La 3+ and 3Cl − ), (ii) the effects of proton and bicarbonate ions on bulk and surface conductance, and (iii) the connected microchannel dimension (surface/height ratio aspect) within the nanochannel apparent conductance. The results highlight a net quantitative increase in surface silanol density and a strong decrease in surface ionization degree when lanthanum cations are employed. The results also demonstrate that La 3+ strongly interacts with the silica surface, leading to negative values of standard free energy for ion-site interactions and chemical potential for ion−ion correlations in the Stern layer of −0.8 and −10.2 kT, respectively. We ascribed the evolution of surface charge density to the balance between the mole ratios of water molecules and adsorbed cations at equilibrium. We found that La 3+ behaves as an acidic cation (Lewis conceptualization) that neutralizes the negative silica surface accompanying water molecule expulsion due to steric hindrance. This study constitutes a new contribution to ion-site interactions and to ion−ion correlation phenomena on the planar silica surface to explain charge inversion observation in micro-nanofluidic devices.

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Dielectric properties of a single nanochannel investigated by high-frequency impedance spectroscopy

Cited by 6 publications

References 29 publications

Phase Transformation of Ce³⁺-Doped MnO₂ for Pseudocapacitive Electrode Materials

Phase Transformation of Ce³⁺-Doped MnO₂ for Pseudocapacitive Electrode Materials

Modeling the role played by nanoslit lengths on conductance changes into micro nano microfluidics devices

Influence of Lanthanum on Stern Layer Conductance in the Nanochannel

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Dielectric properties of a single nanochannel investigated by high-frequency impedance spectroscopy

Cited by 6 publications

References 29 publications

Phase Transformation of Ce3+-Doped MnO2 for Pseudocapacitive Electrode Materials

Phase Transformation of Ce3+-Doped MnO2 for Pseudocapacitive Electrode Materials

Modeling the role played by nanoslit lengths on conductance changes into micro nano microfluidics devices

Influence of Lanthanum on Stern Layer Conductance in the Nanochannel

Contact Info

Product

Resources

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Phase Transformation of Ce³⁺-Doped MnO₂ for Pseudocapacitive Electrode Materials

Phase Transformation of Ce³⁺-Doped MnO₂ for Pseudocapacitive Electrode Materials