Partial modification of flow-through porous electrodes in microfluidic fuel cell

Li, Li; Zheng, Keqing; Ni, Meng; Leung, Michael K. H.; Xuan, Jin

doi:10.1016/j.energy.2015.05.085

Cited by 35 publications

(23 citation statements)

References 46 publications

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“…Therefore, modified-CP electrodes can be selectively employed in the layers, in turn leading to a noticeable reduction in the capital and operating cost of the MFC. The above findings are in agreement with our previous studies regarding the general working principles of MFC with flow-through porous electrodes [63].…”

Section: Multi-layer Porous Electrodesupporting

confidence: 93%

“…effective transport parameters) as well as empirical equations for the involved parameters (e.g. Brinkman correlation for the effective diffusion coefficient) when compared with previous simplified dimensionless models with flow-through porous electrodes developed from our group [63,70]. A schematic of the fuel cell indicating the modeling domain is given in Fig.…”

Section: Modelingmentioning

confidence: 99%

“…It is essential to determine the reaction rate distribution for optimizing the porous electrode since the distribution is non-uniform [63]. Fig.…”

Section: Reaction Rate and Fuel Concentration Distributions In Mfc Wimentioning

confidence: 99%

“…Regarding the operation of the MFC, a balance between performance and cost is imperative when taking into account the novel catalyst materials and the energy consumed by the modification processes. It is thus intriguing to realize whether it is necessary to modify every part of the porous electrode operating with nonuniform reaction rates [61][62][63]. Research on optimal electrode structures for other fuel cell types has been reported in the literature [64][65][66][67][68][69].…”

Section: Introductionmentioning

confidence: 98%

“…For instance, functionally graded electrodes have been investigated for solid oxide fuel cells [64,68,69]. However, limited literature is available on optimal structure of porous electrodes for MFC [63].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Vanadium microfluidic fuel cell with novel multi-layer flow-through porous electrodes: Model, simulations and experiments

Nikiforidis

Leung

et al. 2016

Applied Energy

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Section: Multi-layer Porous Electrodesupporting

confidence: 93%

Section: Modelingmentioning

confidence: 99%

“…It is essential to determine the reaction rate distribution for optimizing the porous electrode since the distribution is non-uniform [63]. Fig.…”

Section: Reaction Rate and Fuel Concentration Distributions In Mfc Wimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Vanadium microfluidic fuel cell with novel multi-layer flow-through porous electrodes: Model, simulations and experiments

Nikiforidis

Leung

et al. 2016

Applied Energy

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In‐Depth Analysis of Electrochemical Reaction Rate Distribution in Microfluidic Fuel Cell with Flow‐Through Electrodes

Ling

Shan

et al. 2022

Energy Tech

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Nonuniform reaction rate distributions are commonly observed in the microfluidic fuel cell (MFC) systems, which bring a significant limit to the cell output. Herein, systematic analyses are performed to explore the electrochemical reaction rate distributions in the flow‐through electrodes of MFCs, and in‐depth understanding of the distribution mechanisms under various operating conditions is presented via a MFC performance simulation model. The results demonstrate that the high‐reaction‐rate regions locate at the inner parts of the flow‐through electrodes in the high flow rate and high‐reactant concentration cases which are ohmic‐resistance dominated, while moving toward the outer parts of the electrodes with the decreasing of flow rate and/or reactant concentration due to the increased concentration‐related activation resistance. A series of performance enhancement strategies are also proposed and examined. It is found that smaller electrode aspect ratio, reduced electrode distance, excess supporting electrolyte, and larger specific surface area are desirable in the high flow rate and high‐reactant concentration cases, which can boost the cell performances significantly. This work can contribute to the optimal designs of microfluidic fuel cells under various application scenarios in the future.

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Role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells

Bei

Xü

et al. 2017

Int J Energy Res

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Summary Significant electrical resistance is observed in porous electrodes of microfluidic fuel cell due to the size limitation of this energy system. In this work, role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells is studied with a three‐dimensional numerical model. Parametric simulations are performed to find proper ways to reduce the electrical resistance, including increasing the electrical conductivity of the electrode, changing the electrode geometry, and optimizing the current collector design. The results indicate that the cell cannot fully get rid of the negative influences of the electrical resistance by increasing the electrical conductivity due to the material restriction. Decreasing the electrode length or increasing the electrode width is also not feasible due to the trade‐off between current and current density. Optimization of the aspect ratio of the electrode active region is proved effective in realizing the enhancement of both current and current density. Extending the current collector area from the exposed end to the active region of the porous electrode is also promising as it can decrease the electrical resistance and boost the cell performance simultaneously. The present findings are generally applicable to various miniaturized fuel cell types using porous electrodes.

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Partial modification of flow-through porous electrodes in microfluidic fuel cell

Cited by 35 publications

References 46 publications

Vanadium microfluidic fuel cell with novel multi-layer flow-through porous electrodes: Model, simulations and experiments

Vanadium microfluidic fuel cell with novel multi-layer flow-through porous electrodes: Model, simulations and experiments

In‐Depth Analysis of Electrochemical Reaction Rate Distribution in Microfluidic Fuel Cell with Flow‐Through Electrodes

Role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells

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