Gravimetric and dynamic deconvolution of global EQCM response of carbon nanotube based electrodes by Ac-electrogravimetry

Escobar-Teran, Freddy; Arnau, Antonio; García, José Manuel Miralles; Jiménez, Yolanda; Perrot, Hubert; Sel, Ozlëm

doi:10.1016/j.elecom.2016.07.005

Cited by 40 publications

(90 citation statements)

References 26 publications

(34 reference statements)

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“…Electrochemical quartz-crystal microbalance (EQCM) and its coupling with electrochemical impedance spectroscopy (the so-called ac-electrogravimetry) have proved themselves as baseline analytical tools to probe electrochemical processes, with tremendous benefits in in situ capturing ionic fluxes in various electrodes, including 3 carbon based electrodes [24][25][26] and CPEs [27,28]. Considerable amount of work has focused on the exploration of electrochemical properties of CPEs, which has been regarded as a prerequisite for improving performances of electrochemical devices [29,30].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Gao

Sel

Perrot

2017

Electrochimica Acta

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To cite this version:Wanli Gao, Ozlem Sel, Hubert Perrot. Electrochemical and viscoelastic evolution of dodecyl sulfatedoped polypyrrole films during electrochemical cycling. Electrochimica Acta, Elsevier, 2017, 233, pp.262 -273. 10 ABSTRACT:The correlation between electrochemical and viscoelastic properties of electrodeposited dodecylsulfate-doped polypyrrole (PPy-DS) during electrochemical cycling process was described through combining electrochemical quartz-crystal microbalance (EQCM), ac-electrogravimetric characterizations and electroacoustic measurements. As the PPy-DS electrode evolves during the course of consecutive cycling in aqueous NaCl electrolyte, the film exhibits (i) an obvious ion-selective transition from cations to anions in the charge compensation process; (ii) an inferior electrochemical performance accompanied with increased stiffness (increased storage moduli, G´); and (iii) depleted capability of ionic exchange through film/electrolyte interface. PPy-DS conducting polymer electrodes (CPEs) are of interest in energy storage and the relationship between electrochemical and viscoelastic properties during electrochemical cycling process is essential for promoting the performance of these devices. In this perspective, ac-electrogravimetry combined with electroacoustic measurements can be suggested as an alternative method to synchronously probe the electrochemical and mechanical evolution and has the potential to offer a generalized route to study aging mechanism of CPEs.

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Section: Introductionmentioning

confidence: 99%

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Gao

Sel

Perrot

2017

Electrochimica Acta

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“…[28][29][30][31] Further information about these parameters is given in the Supporting Information. K i represents the transfer kinetics of each species while G i is the reciprocal of the transfer resistance (Rt i = 1/FG i ), exhibiting the ease or difficulty in the species transfer at the film/electrolyte interface.…”

Section: Resultsmentioning

confidence: 99%

“…Both EQCM and ac-electrogravimetry measurements were performed in 0.25 m Na 2 SO 4 containing aqueous electrolyte under nitrogen atmosphere, where a ZnO-or ZnO@ERGO-loaded quartz resonator was used as the working electrode, Ag/AgCl (3 m KCl saturated with AgCl) as the reference electrode and a platinum grid as the counter electrode. [28][29][30][31]) were fitted where a good agreement between the experimental and the theoretical functions in terms of both the shape and the frequencies should be achieved, to consider that these parameters (M i , K i , and G i ) are unique. The mass change (Δm) of the electrode during electrochemical process can be estimated by the microbalance frequency change (Δf) through Sauerbrey equation, [34] i.e., Δf = −C f × Δm, where C f is the experimental sensitivity factor of the quartz crystal resonator (C f = 16.3 × 10 7 Hz g −1 cm 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…[3,4] Currently, tremendous efforts have been devoted into the hybridization of ZnO nanostructures monitored during an electrochemical process. [28][29][30] Herein, a thin electrochemically reduced graphene oxide (ERGO) sheltering incorporated onto 1D ZnO nanorods (ZnO@ ERGO) was prepared as the electrode via a bottom-up approach, showing an advancement in the synthesis of novel nanostructured electrode materials for supercapacitors. [25][26][27] To further explore the transfer dynamics and exact identity of each participant during electrochemical process, a nonconventional complementary technique, electrogravimetric impedance, or the so-called ac-electrogravimetry was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Then, these TFs are fitted with an appropriate model to scrutinize the identity of the species involved in the charge transfer mechanism, along with the kinetics and the relative concentration changes associated with each species. [28][29][30] Herein, a thin electrochemically reduced graphene oxide (ERGO) sheltering incorporated onto 1D ZnO nanorods (ZnO@ ERGO) was prepared as the electrode via a bottom-up approach, showing an advancement in the synthesis of novel nanostructured electrode materials for supercapacitors. The electrochemical processes involved at the ZnO@ERGO electrode/electrolyte interface were investigated by a complementary methodology comprising EQCM and electrogravimetric impedance spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemically Reduced Graphene Oxide‐Sheltered ZnO Nanostructures Showing Enhanced Electrochemical Performance Revealed by an In Situ Electrogravimetric Study

Gao

Demir‐Cakan

Perrot

et al. 2019

Adv Materials Inter

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with various functional nanomaterials offering synergic properties, such as metal oxides, [5] conducting polymers [2] or carbon materials. [6][7][8][9][10][11][12] The combination of carbon materials with ZnO offers the benefits of both the electrical double layer (EDL) capacitance of the carbon materials with large specific surface area (SSA) and the faradaic contribution of the ZnO, thereby optimizing the electrochemical performance of the ZnO-based SCs. [8] Among carbon materials, graphene has spurred significant interest in electrochemical energy storage due to its high SSA, superior electronic conductivity and chemical resilience. [13][14][15] Therefore, an integration of 1D ZnO nanostructures and graphene is desirable for electrode materials. Besides, the rational design and synthesis of 1D ZnO and graphene nanostructures with a 3D interconnected morphology is another consideration for a promising SC device. Compared with the ZnO nanostructures grown on the graphene, where only upper graphene surface is available to electrolyte, a thin layer of graphene covered ZnO nanostructures is postulated to provide higher number of electroactive sites for charge storage due to the accessibility of both surfaces (upper and lower) to electrolyte, allowing for more effective charge and mass exchange. However, this unique ZnO/graphene heterostructure has rarely been studied, and rare examples include the reduced graphene oxide (rGO)/ZnO nanorods composites synthesized on graphene coated poly(ethylene terephthalate) (PET) flexible substrates, leading to the rGO/ZnO/rGO sandwich structures [16,17] and 3D ZnO (zinc oxide)/rGO/ZnO structures where the ZnO nanostructures are sandwiched or intercalated between the graphene sheets. [3] However, fundamental importance of the ionic flux into the electrode, which plays an essential role in understanding the charge-storage mechanism of a specific electrochemical system is generally underestimated. The study of such architectures with coupled methods such as coupling electrochemistry with gravimetric analysis, i.e., quartz crystal microbalance (QCM) can significantly contribute to their further development.Electrochemical quartz crystal microbalance (EQCM) has developed into a powerful in situ technique to measure ionic fluxes in different electrochemical systems, [18][19][20][21][22][23][24] in which not only the current response (ΔI) but also the in situ capturing of global gravimetric change (Δm) at the electrode/electrolyte interface is The present work is on the synthesis and characterization of vertically aligned ZnO nanostructures sheltered by electrochemically reduced graphene oxide (ERGO), i.e., ZnO@ERGO, which are directly generated on quartz resonators of microbalance sensors. The vertical orientation of the ZnO nanorods is achieved by a two-step synthesis method involving an electrochemically grown seed layer and a subsequent hydrothermal growth. Deposited ERGO thin layer turns out to be highly effective to enhance the electrochemical performances of vertically oriented Z...

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Mechanisms of Porous Carbon‐based Supercapacitors

Cao

et al. 2021

ChemNanoMat

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Supercapacitors are electrochemical energy storage devices that function by the adsorption of ions from an electrolyte onto an electrode with a high surface area. Due to the advantages such as high‐power density and a longer life span, supercapacitors bearing nanoscale porous carbon‐based electrodes, have gained special interest. The high specific surface area of nano‐scale porous carbon‐based electrodes could substantially increase the energy density of supercapacitors. Here we review the research pertaining to the energy storage of supercapacitors and the mechanism regulating the microscopic energy storage within nanopores. The advantages and challenges of various in situ characterization techniques and simulation techniques in the energy storage mechanism were discussed. The effective combination of in situ characterization techniques and computer simulations has been highlighted since it provides a useful means to understand the intrinsic properties of the electrode/electrolyte interface and various physicochemical reactions that take place during charging/discharging. This understanding is valuable for the design and development of next‐generation supercapacitors with the high power density and high energy density.

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Gravimetric and dynamic deconvolution of global EQCM response of carbon nanotube based electrodes by Ac-electrogravimetry

Abstract: metric and dynamic deconvolution of global EQCM response of carbon nanotube based electrodes by Ac-electrogravimetry. Electrochemistry Communications, Elsevier, 2016, 70, pp.73 -77

Cited by 40 publications

References 26 publications

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Electrochemical and viscoelastic evolution of dodecyl sulfate-doped polypyrrole films during electrochemical cycling

Electrochemically Reduced Graphene Oxide‐Sheltered ZnO Nanostructures Showing Enhanced Electrochemical Performance Revealed by an In Situ Electrogravimetric Study

Mechanisms of Porous Carbon‐based Supercapacitors

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