Capacitive Charge Storage at the Glassy Carbon Electrode: Comparison Between Aqueous and Non-Aqueous Electrolytes

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

doi:10.1149/1945-7111/ac2a7d

Cited by 7 publications

(3 citation statements)

References 35 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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“…25 This has since been shown to be the case in both aqueous and non-aqueous electrolytes. 26 Most recently, this was again validated by rotating disk electrode voltammetry, in which case the thickness of the stagnant layer, as determined by the electrode rotation rate, influenced interfacial capacitive charge storage. 27 If the diffuse layer was as thin as predicted by Eq.…”

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confidence: 89%

Electrode Spacing Effects on the Capacitance of Glassy Carbon Electrodes in Aqueous Electrolytes

Wilson,

Callahan,

Cameron

et al. 2024

J. Electrochem. Soc.

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Matched glassy carbon electrodes in aqueous K2SO4 electrolytes were used to examine the effects of opposing electrode spacing on capacitive performance. Planar non-porous glassy carbon electrodes were used to avoid complications with porosity and roughness. Electrode spacing effects were examined in terms of device and individual electrode performance, using cyclic voltammetry, coupled with its deconvolution into residual, diffusional, and capacitive processes. Decreasing the spacing between electrodes led to a decrease in capacitive contributions, and a relative increase in diffusional and residual contributions, implying that individual electrodes were influencing the behaviour of each other. This is also consistent with the use of more dilute electrolytes. Electrode behaviour was modelled using the Poisson-Boltzmann equation, together with its integrated outputs of electric field and potential difference. For electrodes with the same amount of charge and a similar diffuse layer thickness, the electric field and potential drop was diminished because of their charge interaction. Conversely, it is shown that for a similar potential drop across the electrodes, the variable controlled in a cyclic voltammetry experiment, more charge accumulation is needed at the electrode-electrolyte interface to compensate for the counter charge generate from the opposing electrode.

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Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials

Qorbani,

Chen,

Chen

2024

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An electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative electrodes. Beyond harnessing capacitive, pseudocapacitive, or Faradaic energy storage mechanisms and enhancing electrochemical performance at high rates, achieving a balance of stored charge across electrodes poses a significant challenge over a wide range of charge–discharge currents or sweep rates. Consequently, fabricating hybrid and asymmetric supercapacitors demands precise electrochemical evaluations of electrode materials and the development of a reliable methodology. This work provides an overview of fundamental aspects related to charge‐storage mechanisms and electrochemical methods, aiming to discern the contribution of each process. Subsequently, the electrochemical properties, including the working potential windows, rate capability profiles, and stabilities, of various families of electrode materials are explored. It is then demonstrated, how charge balancing between electrodes falters across a broad range of charge–discharge currents or sweep rates. Finally, a methodology for achieving charge balance in hybrid and asymmetric supercapacitors is proposed, outlining multiple conditions dependent on loaded mass and charge–discharge current. Two step‐by‐step tutorials and model examples for applying this methodology are also provided. The proposed methodology is anticipated to stimulate continued dialogue among researchers, fostering advancements in achieving stable and high‐performance supercapacitor devices.

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Capacitive Charge Storage at the Glassy Carbon Electrode: Comparison Between Aqueous and Non-Aqueous Electrolytes

Cited by 7 publications

References 35 publications

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

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

Electrode Spacing Effects on the Capacitance of Glassy Carbon Electrodes in Aqueous Electrolytes

Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials

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