Reactant recirculation in electrochemical co-laminar flow cells

被引:47
作者
Goulet, Marc-Antoni [1 ]
Kjeang, Erik [1 ]
机构
[1] Simon Fraser Univ, Sch Mech Syst Engn, Surrey, BC V3T 0A3, Canada
基金
加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词
co-laminar flow cell; microfluidic; laminar; fuel cell; flow battery; MICROFLUIDIC FUEL-CELL; THROUGH POROUS-ELECTRODES; MEMBRANELESS; BATTERY; STACK; CHIP;
D O I
10.1016/j.electacta.2014.03.092
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Co-laminar electrochemical cells utilize hydrodynamic engineering rather than a physical separator to prevent mixing of reactants. Commonly known as microfluidic fuel cells and batteries, these cells are based on stratified laminar flow of reactants in a microfluidic channel. The objective of the present work is to evaluate the feasibility and effectiveness of reactant recirculation in co-laminar flow cells with flow-through porous electrodes. Two representative device architectures are fabricated with separate outlets for reactant recirculation in Y-junction and dual-pass configurations. It is found that crossover at the electrodes reduces the open circuit potential of both cells and serves as a useful diagnostic method for assessing the degree of crossover at the outlets. Outlet concentration is monitored at a range of flow rates and indicates that asymmetric splitting of the co-laminar interface can lead to a constant 2% loss of state of charge, while the loss due to diffusion ranges from 0-40%. The dual-pass cell is shown to have greater diffusive loss due to deceleration at the splitting junction but also demonstrates better performance due to its higher convective velocity through the porous electrodes. These effects are observed during a series of discharge operations with recirculating reactants, in which the dual-pass cell results in greater reactant utilization despite its higher crossover rates. Overall, the present results demonstrate reactant recirculation as a useful strategy to combine high reactant utilization and high power density in membraneless co-laminar flow cells. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:217 / 224
页数:8
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