Guidelines for supercapacitor electrochemical analysis: A comprehensive review of methodologies for finding charge storage mechanisms

Journal of Energy Storage, Год журнала: 2024, Номер 98, С. 112833 - 112833

Опубликована: Июль 25, 2024

Язык: Английский

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Perspectives on accurately analyzing cyclic voltammograms for surface- and diffusion-controlled contributions

Electrochemistry Communications, Год журнала: 2023, Номер 159, С. 107654 - 107654

Опубликована: Дек. 21, 2023

As electrochemical energy storage continues to gain importance, researchers have been exploring novel materials and electrode designs enhance performance. While these innovations significantly improved the performance of devices, specific mechanisms responsible for their success remain unclear. One powerful tool gaining insights into how modifications can cell is cyclic voltammetry (CV). However, interpreting CV data be challenging, simple analytical relations are often inadequate accurate assessment. Moreover, different methods yield conflicting results, leading confusion within research community hindering progress in field. To address challenges, our study aims investigate contributions surface diffusion-controlled processes charge supercapacitor applications. We will employ conventional examine lead misinterpretation identify advantages limitations approaches. Our underscores importance developing models that faithfully replicate system interest mechanisms. By identifying key factors, findings could pave way development more efficient effective technologies.

Язык: Английский

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Modeling cyclic voltammetry responses of porous electrodes: An approach incorporating faradaic and non-faradaic contributions through porous model and constant phase element

Journal of Energy Storage, Год журнала: 2024, Номер 83, С. 110804 - 110804

Опубликована: Фев. 7, 2024

Язык: Английский

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Topology optimization for the full-cell design of porous electrodes in electrochemical energy storage devices

Structural and Multidisciplinary Optimization, Год журнала: 2024, Номер 67(11)

Опубликована: Ноя. 1, 2024

Язык: Английский

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Numerical Modeling and Topology Optimization for Designing the Anode Catalyst Layer in Proton Exchange Membrane Water Electrolyzers Considering Mass Transport Limitation

Journal of The Electrochemical Society, Год журнала: 2024, Номер 171(7), С. 074502 - 074502

Опубликована: Июль 1, 2024

With the escalation of global warming primarily attributed to fossil fuel and other non-renewable energy consumption, production green hydrogen emerges as a mitigation strategy reduce usage effectively harness renewable sources for storage. The proton exchange membrane water electrolyzer (PEMWE) stands out promising technology, boasting high efficiency rapid response variations in current density. Despite its stellar performance, reliance on precious materials presents cost challenge. To address this concern, we developed numerical model considering mass transport limitations temperature variation. topology optimization (TO) method is employed generate optimal structure electrode by organizing two primary constituent materials. Additionally, impact points representing low (1.73 V) (2.03 operating voltage characteristics analyzed. demonstrates maximum performance improvement up 2.7 times at an 2.03 V compared homogeneous structure. gas coverage influences rearrangement materials, particularly void fraction, creating channels facilitate reaction. Optimization yields more significant scenario.

Язык: Английский

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A method for estimating optimized porosity distribution in Reaction-Diffusion systems without reliance on topology optimization

Chemical Engineering Science, Год журнала: 2024, Номер 298, С. 120420 - 120420

Опубликована: Июнь 25, 2024

Язык: Английский

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Design principle for topography-optimized porous reactors: entropy generation minimization and equipartition of entropy production

International Journal of Heat and Mass Transfer, Год журнала: 2025, Номер 245, С. 127000 - 127000

Опубликована: Март 29, 2025

Язык: Английский

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Local and Global Entropy Generation of Topographically Optimized Porous Reactors in Reaction-Diffusion Systems Considering Coupling Effects between Heat and Mass Transfer

SAE technical papers on CD-ROM/SAE technical paper series, Год журнала: 2025, Номер 1

Опубликована: Апрель 18, 2025

<div class="section abstract"><div class="htmlview paragraph">As the automotive sector shifts towards cleaner and more sustainable technologies, fuel cells batteries have emerged as promising technologies with revolutionary potential. Hydrogen cell vehicles offer faster refueling times, extended driving ranges, reduced weight space requirements compared to battery electric vehicles, making them highly appealing for future transportation applications. Despite these advantages, optimizing electrode structures balancing various transport mechanisms are crucial improving PEFCs’ performance widespread commercial viability. Previous research has utilized topology optimization (TO) identify optimal attempted establish a connection between entropy generation topographically optimized structures, aiming strengthen TO numerical findings robust theoretical basis. However, existing studies often neglected coupling of phenomena. Typically, it is assumed that single force corresponds specific flux, such temperature gradient heat transfer (following Fourier’s law) or concentration mass Fick’s law). From non-equilibrium thermodynamics (NET) perspective, multiple forces contribute fluxes in electrochemical systems. This study aims explore local global porous reactors reaction-diffusion systems, considering effects transport. The results reveal tree-like structure design reactors. heterogeneous exhibits minimal scaled most uniform generation. Furthermore, distinguishes discusses from different mechanisms.</div></div>

Язык: Английский

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Optimal Porous Electrode Structures in All-Vanadium Redox Flow Batteries

SAE technical papers on CD-ROM/SAE technical paper series, Год журнала: 2025, Номер 1

Опубликована: Апрель 18, 2025

<div class="section abstract"><div class="htmlview paragraph">To address the pressing issue of electrical fluctuations from renewable energy technologies, an storage system (ESS) is proposed. The vanadium redox flow battery (VRFB) gaining significant attention due to its extended lifespan, durability, thermal safety, and independent power capacity, despite high cost. Key components VRFB include a membrane, carbon electrode, bipolar plate, gasket, current collector, electrolyte, pump. Among these, electrode plate are most expensive. Reducing capital costs in systems crucial for advancing clean solutions. Conventional field designs like interdigitated (IFF), serpentine (SFF), parallel (PFF) used feed electrolyte into cell, necessitating thicker plates avoid cracking during machining process. This study focuses on optimizing flow-through (FT) design, which eliminates need plates, thus allowing thinner plates. By enhancing cell performance through design porous structures when operating at 5% depth discharge (DoD), this utilizes topology optimization, rather than conventional trial-and-error methods, search optimal structures. results revealed that interdigitated-type channel created within electrodes with different both positive negative sides achieve higher overall performance. limiting was found be approximately 0.08, 0.13, 0.41 A/cm² cases homogeneous FT, IFF, optimized (OFT), respectively. peak density significantly improved by 284% 155% compared FT respectively.</div></div>

Язык: Английский

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Impacts of Pulsating Flow on Topologically Optimized Porous Reactors in Convection-Diffusion-Reaction Systems

SAE technical papers on CD-ROM/SAE technical paper series, Год журнала: 2025, Номер 1

Опубликована: Апрель 18, 2025

<div class="section abstract"><div class="htmlview paragraph">Topology optimization (TO) in electrochemical systems has recently attracted many researchers. Previous studies suggested minimal performance differences between 2D and 3D designs, indicating that models suffice to enhance performance, especially unidirectional flow scenarios. A later study found the concentration distribution an optimized system differed from a system. We posited pulsating could further of such systems. First, we initiated TO for diffusion-reaction steady state. The structure obtained this process served as foundation subsequent investigations involving source convection-diffusion-reaction introduced two different with distinct natures: one characterized by nature 1D other 2D. results demonstrated heterogeneous consistently outperformed its homogeneous counterpart both introduction had no significant effect on 1D. However, nature, significantly improved overall reaction performance. This enhancement was attributed substantial species consumption at inlet, resulting non-linear projected distribution. effectively pumped reach farthest end, enhancing reaction. degree improvement increased frequency pulse. While optimal remains undetermined, effort is needed improvement.</div></div>

Язык: Английский

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