Combined step potential electrochemical spectroscopy and electrochemical impedance spectroscopy analysis of the glassy carbon electrode in an aqueous electrolyte

Davey, Sofia B.; Cameron, Amanda P.; Latham, Kenneth G.; Donne, Scott W.

doi:10.1016/j.electacta.2021.139220

Cited by 12 publications

(10 citation statements)

References 42 publications

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“…These results support previous work indicating a thick electrolyte charge storage layer (∼500 μm). [35][36][37][38] The cathodic capacitance is shown in Fig. 1c, together with the anodic-to-cathodic capacitance ratio (efficiency).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, we have used advanced techniques to probe the electrified interface between planar non-porous glassy carbon and common aqueous and non-aqueous electrolytes [35][36][37][38] to show that mass transport of ions to the interface boosted charge storage, and that the diffuse layer was quite thick (∼500 μm). To provide additional supporting data, we report here on the use of a glassy carbon rotating disk electrode (RDE) to examine interfacial capacitance.…”

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confidence: 99%

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Communication—Demonstrating the Role of Mass Transport in Double Layer Formation

Cameron¹,

Davey²,

Callahan³

et al. 2022

J. Electrochem. Soc.

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Herein we present insight into the structure and behaviour of the electrified interface formed between a planar non-porous glassy carbon electrode and an aqueous solution of 0.5 M Na2SO4. Specifically, a glassy carbon rotating disk electrode was used to show correspondence between a decreasing rotation rates, and hence a decreasing boundary layer thickness, with a decreasing interfacial capacitance. The implication is that electrolyte counter charge is being dissipated by convective flow outside of the boundary layer. With the boundary layer thickness being macroscopic, it is clear that electrolyte counter-charge extends a substantial distance into the electrolyte.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Communication—Demonstrating the Role of Mass Transport in Double Layer Formation

Cameron¹,

Davey²,

Callahan³

et al. 2022

J. Electrochem. Soc.

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“…In this section, we studied the effect of the penalties 𝑃 and 𝑃 added in ℒ (𝜽) to handle DRTs with negative peaks. More precisely, we investigated for 𝑁 = 10 𝑀 𝑃 and each component of 𝑃 in (11) to assess how well these functions could suppress oscillations and minimize the errors 𝜀 , and 𝜀 , . Interestingly, 𝑃 alone was not sufficient to suppress the oscillations created during RR, and we found in this case that 𝜀 , and 𝜀̅ , were close to the case without penalties (Table S25).…”

Section: Discontinuous Drtsmentioning

confidence: 99%

“…Electrochemical impedance spectroscopy (EIS) is an experimental technique widely used for the analysis of electrochemical energy devices (e.g., batteries [1][2][3][4][5], fuel cells [6][7][8][9][10], and supercapacitors [11][12][13][14]), medical [15,16], and biological [17][18][19] systems. The major appeals of this technique are that it can be carried out over a wide range of frequencies (from mHz to MHz) [20] and that modern equipment allows us to measure EIS spectra quickly and efficiently with limited user expertise.…”

Section: Introductionmentioning

confidence: 99%

Deconvolution of Electrochemical Impedance Spectroscopy Data Using the Deep-Neural-Network-Enhanced Distribution of Relaxation Times

Quattrocchi

Maradesa

et al. 2022

Preprint

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Electrochemical impedance spectroscopy (EIS) is a characterization technique widely used to evaluate the properties of electrochemical systems. The distribution of relaxation times (DRT) has emerged as a model-free alternative to equivalent circuits and physical models to circumvent the inherent challenges of EIS analysis. Deep neural networks (DNNs) can be used to deconvolve DRTs, but several issues remain, e.g., the long training time, the DNN accuracy, and the deconvolution of DRTs with negative peaks. The DNN-DRT model was developed here to address these fundamental limitations. Specifically, a pretraining step was included to decrease the computation time. A thorough error analysis was also conducted to evaluate the different components of the DRT and impedance errors to ultimately decrease them. Lastly, the training loss function was modified to handle DRTs with negative peaks. These different advances were validated with an array of synthetic EIS spectra and real EIS spectra from a lithium-ion battery, a solid oxide fuel cell, and a proton exchange membrane fuel cell. Moreover, this new model outperformed in most cases the previously developed DRTtools and deep-DRT model. Overall, we envision that this research will open the venue for more DNN-based analyses of EIS data for electrochemical systems.

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“…20 The authors associate the term with delayed reactions, where charge transfer is the ratelimiting step but do not rule out the possibility that the transient current minimum over long times is due to slower diffusion processes caused by the high ionic concentration of electrolytes or to the degradation of the electrolyte itself. Recently, the parameters of Equation 4have been intensely discussed for porous electrodes 21 or intercalation reactions, 22 in addition to glassy carbon 23 and metal oxides 24 in liquid cells.…”

Section: Introductionmentioning

confidence: 99%

Investigation of diffusivity in nanometer‐thick yttria‐stabilized zirconia by chronoamperometry and its formalism

et al. 2023

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This work aims to demonstrate that chronoamperometry is a valuable tool for determining diffusivities in all‐solid‐state nanometer‐thick cells. The transient current in chronoamperometry of electrochemical cells under constant voltage is described by firstly considering purely capacitive processes, defined by RC circuit equations, and then purely diffusive processes, by Cottrell's equations. The physical meaning of the equations has been amply described in liquid cells with porous electrodes but scarcely in solid‐state cells. We studied Ru/YSZ/Au and Ru/YSZ/Ru parallel nano‐cells at temperatures between 50°C and 170°C and voltages between 0.5 V and 1.5 V, where non‐faradaic processes occur. The calculated diffusive and capacitive contributions at different temperatures obey the Arrhenius law. The activation energy was associated with vacancies, the major carrier during electrical transport. The analysis discusses other parameters, such as capacitance, effective concentration, and leakage current. The experimental diffusivity of YSZ electrolytes was compared with diffusivity values obtained by the statistical moment method.This article is protected by copyright. All rights reserved

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Combined step potential electrochemical spectroscopy and electrochemical impedance spectroscopy analysis of the glassy carbon electrode in an aqueous electrolyte

Cited by 12 publications

References 42 publications

Communication—Demonstrating the Role of Mass Transport in Double Layer Formation

Communication—Demonstrating the Role of Mass Transport in Double Layer Formation

Deconvolution of Electrochemical Impedance Spectroscopy Data Using the Deep-Neural-Network-Enhanced Distribution of Relaxation Times

Investigation of diffusivity in nanometer‐thick yttria‐stabilized zirconia by chronoamperometry and its formalism

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