Temperature effects on electrical double layer at solid‐aqueous solution interface

Alizadeh, Amer; Wang, Moran

doi:10.1002/elps.201900354

Cited by 21 publications

(10 citation statements)

References 44 publications

(77 reference statements)

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“…In a recent experiment [1], the reversible heat flowing into and the electric work applied to a supercapacitor during isothermal charging were measured. This experiment is one of several recent studies, both experimental [1][2][3][4] and theoretical [5][6][7][8][9][10], on the intricate interplay between the electrolyte's temperature and the properties of the electric double layer (EDL). Until now, however, no comparison has been made between the experimental findings of Ref.…”

Section: Introductionmentioning

confidence: 99%

Reversible heat production during electric double layer buildup depends sensitively on the electrolyte and its reservoir

Glatzel

Janssen

Härtel

2021

The Journal of Chemical Physics

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Several modern technologies for energy storage and conversion are based on the screening of electric charge on the surface of porous electrodes by ions in an adjacent electrolyte. This so-called electric double layer (EDL) exhibits an intricate interplay with the electrolyte's temperature that was the focus of several recent studies. In one of them, Janssen et al. [Phys. Rev. Lett. 119, 166002 (2017)] experimentally determined the ratio Qrev/W el of reversible heat flowing into a supercapacitor during an isothermal charging process and the electric work applied therein. To rationalize that data, here, we determine Qrev/W el within different models of the EDL using theoretical approaches like density functional theory (DFT) as well as molecular dynamics simulations. Applying mainly the restricted primitive model, we find quantitative support for a speculation of Janssen et al. that steric ion interactions are key to the ratio Qrev/W el . Here, we identified the entropic contribution of certain DFT functionals, which grants direct access to the reversible heat. We further demonstrate how Qrev/W el changes when calculated in different thermodynamic ensembles and processes. We show that the experiments of Janssen et al. are explained best by a charging process at fixed bulk density, or in a "semi-canonical" system. Finally, we find that Qrev/W el significantly depends on parameters as pore and ion size, salt concentration, and valencies of the cat-and anions of the electrolyte. Our findings can guide further heat production measurements and can be applied in studies on, for instance, nervous conduction, where reversible heat is a key element.

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Section: Introductionmentioning

confidence: 99%

Reversible heat production during electric double layer buildup depends sensitively on the electrolyte and its reservoir

Glatzel

Janssen

Härtel

2021

The Journal of Chemical Physics

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“…In Figure 2a, it can be seen from the schematic diagram that a large number of PTFE/PSAN microspheres are coagulated on the surface of T-spirulina by electrostatic attraction, forming hetero-coagulation products with core-shell structure. The mechanism of hetero-coagulation is mainly based on diffuse electrical double layer model 33 . With assist of formic Observed from zeta potentials in Figure 2b, the zeta potential values increase significantly after adding T-spirulina and formic acid.…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

“…The mechanism of hetero-coagulation was mainly based on a diffuse electrical double layer model. 33 With the assistance of formic acid, the TTAB on the T-spirulina surface completely destroyed the electrical double-layer structure of the PTFE/PSAN microspheres, so that the PTFE/PSAN microspheres were adsorbed on the T-spirulina surface.…”

Section: Papermentioning

confidence: 99%

Removal of highly dispersive microspheres from wastewater using modified spirulina hetero-coagulation and their application in flame retardancy

et al. 2022

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“…Although the ETL model proved to be a great step forward in figuring out the surface charge and electric potential at the chemically active solid surface and the aqueous solution interface based on the properties of the solid surface, it cannot explain some experimental observations such as the impact of solution temperature on the zeta potential [50] or the concentration-dependent electrical conductivity of ultranarrow channels (approximately 2 nm) [17]. With this aim, Alizadeh et al [17] further developed the ETL model in which an extra layer was added between the zeta potential (ZP) plane and the OHP, called the buffer layer (BL) (Fig.…”

Section: Models To Explain the Charged Solid-liquid Interfacementioning

confidence: 99%

“…Equation (50) indicates that the induced pressure gradient owing to the applied external electric field is solely a function of the effective pore diameter and the electrochemical properties of the porous medium.…”

Section: Eof Through Microporous Mediamentioning

confidence: 99%

Electroosmotic flow: From microfluidics to nanofluidics

et al. 2021

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Electroosmotic flow (EOF), a consequence of an imposed electric field onto an electrolyte solution in the tangential direction of a charged surface, has emerged as an important phenomenon in electrokinetic transport at the micro/nanoscale. Because of their ability to efficiently pump liquids in miniaturized systems without incorporating any mechanical parts, electroosmotic methods for fluid pumping have been adopted in versatile applications—from biotechnology to environmental science. To understand the electrokinetic pumping mechanism, it is crucial to identify the role of an ionically polarized layer, the so‐called electrical double layer (EDL), which forms in the vicinity of a charged solid–liquid interface, as well as the characteristic length scale of the conducting media. Therefore, in this tutorial review, we summarize the development of electrical double layer models from a historical point of view to elucidate the interplay and configuration of water molecules and ions in the vicinity of a solid–liquid interface. Moreover, we discuss the physicochemical phenomena owing to the interaction of electrical double layer when the characteristic length of the conducting media is decreased from the microscale to the nanoscale. Finally, we highlight the pioneering studies and the most recent works on electro osmotic flow devoted to both theoretical and experimental aspects.

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Temperature effects on electrical double layer at solid‐aqueous solution interface

Cited by 21 publications

References 44 publications

Reversible heat production during electric double layer buildup depends sensitively on the electrolyte and its reservoir

Reversible heat production during electric double layer buildup depends sensitively on the electrolyte and its reservoir

Removal of highly dispersive microspheres from wastewater using modified spirulina hetero-coagulation and their application in flame retardancy

Electroosmotic flow: From microfluidics to nanofluidics

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