微流控电化学流动电容器中附面层对浆液电极充电的影响

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION
Brandon Stacks, Haoxiang Luo, Deyu Li
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引用次数: 0

摘要

流动浆液电极在电化学流动电容器(EFCs)和电容去离子等能源和水系统中发挥着重要的作用。浆液电极的电化学性能取决于浆液中作为单个电容器的多孔颗粒的流体动力学行为,它们与固定电极以及彼此之间的动态相互作用对于将电荷扩散到浆液中必不可少。活性炭是浆料中典型的颗粒材料,由于其不透明,目前尚难以直接观察浆料流动和颗粒相互作用。我们之前报道了一种微流体电化学流动电容器(µ-EFC),它由透明材料制成,可以在连续流动条件下同时对浆液电极进行电化学表征和光学观察。然而,在μ -EFC的顶部和底部放置固定的氧化铟锡(ITO)电极,使得直接观察ITO电极边界层中的颗粒动力学具有挑战性。在这里,我们报道了在微efc通道中包含三维(3D)金电极,这可以更好地可视化固定电极边界层中的粒子行为。结果表明,颗粒在不同长度的三维电极上流动和相互作用时具有独特的行为,这对浆料电极的电化学性能具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observing boundary layer effects on slurry electrode charging in a microfluidic electrochemical flow capacitor

Flowable slurry electrodes play important roles in a few promising technologies for energy and water systems including electrochemical flow capacitors (EFCs) and capacitive deionization. The electrochemical performance of slurry electrodes depends on the hydrodynamic behavior of the porous particles in the slurry that serve as individual capacitors, whose dynamic interactions with the stationary electrodes and between each other are essential for spreading charges to the bulk of the slurry. So far, it has been difficult to directly observe the slurry flow and particle interactions because of the opacity of the activated carbon, a typical particle material in slurries. We previously reported a microfluidic electrochemical flow capacitor (µ-EFC), which is made of transparent materials and allows for simultaneous electrochemical characterization and optical observation of slurry electrodes under continuous flow conditions. However, the placement of the stationary Indium Tin Oxide (ITO) electrodes at the top and bottom of the µ-EFC renders it challenging to directly observe the particle dynamics in the boundary layer of the ITO electrode. Here we report on inclusion of three-dimensional (3D) gold electrodes in the µ-EFC channels, which allows for better visualization of the particle behavior in the boundary layer of stationary electrodes. The results show unique particle behaviors as they flow along and interact with the 3D electrodes of different lengths, which have important implications to the electrochemical performance of slurry electrodes.

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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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