Investigation of bubble effect in microfluidic fuel cells by a simplified microfluidic reactor

Shyu, Jin‐Cherng; Wei, Chung Sheng; Lee, Ching Jiun; Wang, Chi-Chuan

doi:10.1016/j.applthermaleng.2010.04.029

Cited by 41 publications

(18 citation statements)

References 19 publications

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“…However, under such circumstances, the path of the formic acid flow would be winding and would cause the anode flow to touch the cathode, as is the case in Figure 7. This reduced the current output of the fuel cell, and thus resulted in both a lower bubble growth rate due to the lower current output [18] and a longer bubble resident time. In addition, the bubble would also grow very slowly in the microfluidic fuel cell with a formic acid concentration of 0.3 M at a flow rate of 0.3 mL/min because of the inferior cell performance, as shown in Figure 8a.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Test of an Air-Breathing Microfluidic Fuel Cell

et al. 2015

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An air-breathing direct formic acid microfluidic fuel cell, which had a self-made anode electrode of 10 mg/cm 2 Pd loading and 6 mg/cm 2 Nafion content, was fabricated and tested. The microfluidic fuel cell was achieved by bonding a PDMS microchannel that was fabricated by a soft-lithography process and a PMMA sheet that was machined by a CO2 laser for obtaining 50 through holes of 0.5 mm in diameter. Formic acid of 0.3 M, 0.5 M, and 1.0 M, mixed with 0.5-M H2SO4, was supplied at a flow rate ranging from 0.1 to 0.7 mL/min as fuel. The maximum power density of the fuel cell fed with 0.5-M HCOOH was approximately 31, 32.16, and 31 mW/cm 2 at 0.5, 0.6, and 0.7 mL/min, respectively. The simultaneous recording of the flow in the microchannel and the current density of the fuel cell at 0.2 V, within a 100-s duration, showed that the period and amplitude of each unsteady current OPEN ACCESSEnergies 2015, 8 2083 oscillation were associated with the bubble resident time and bubble dimension, respectively. The effect of bubble dimension included the longitudinal and transverse bubble dimension, and the distance between two in-line bubbles as well.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Test of an Air-Breathing Microfluidic Fuel Cell

et al. 2015

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“…Additionally, microfl uidic fuel cells have been widely studied from a modeling approach [238,261,262] . More recently, the Kjeang group [239,241,242,263] , the Alonso-Vante group [131, 264 -266] , the H. Wang group [263,267,268] and the C. Wang group [269] have also contributed signifi cantly to the development of microfl uidic fuel cells.…”

Section: Laminar Fl Ow Fuel Cells 53mentioning

confidence: 99%

Tailoring nanostructured catalysts for electrochemical energy conversion systems

Gago¹,

Habrioux

Alonso-Vante

2012

Nanotechnology Reviews

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This review covers topics related to the synthesis of nanoparticles, the anodic and cathodic electrochemical reactions and low temperature electrochemical energy devices. The thermodynamic aspects of nucleation and growth of nanoparticles are discussed. Different methods of chemical synthesis such as w/o microemulsion, B ö nnemann, polyol and carbonyl are presented. How the electrochemical reactions take place on the surface of the catalytic nanoparticles and the importance of the substrate is put in evidence. The use of nanomaterials in low temperature energy devices such as H 2 /O 2 polymer electrolyte or proton exchange membrane fuel cell (PEMFC) and micro-direct methanol fuel cell ( μ DMFC), as well as recent progress and durability, is discussed. Special attention is given to the novel laminar fl ow fuel cell (LFFC). This review starts with the genesis of catalytic nanoparticles, continues with the surface electrochemical reactions that occur on them, and fi nally it discusses their application in electrochemical energy devices such as low temperature fuel cells or Li-air batteries.

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“…Buildup of carbon dioxide over the anode may results in bubble generation. Carbon dioxide bubbles generated in the channel can create two main problems [28]. Firstly, they can fill the channel and change the interface of the two streams, or even mix up the two streams completely, which results in a crossover phenomenon.…”

Section: Fuel Cell Performance With 1 M Formic Acidmentioning

confidence: 99%

Air-breathing membraneless laminar flow-based fuel cell with flow-through anode

Shaegh

Nguyen

Chan

et al. 2012

International Journal of Hydrogen Energy

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This paper describes a detailed characterization of laminar flow-based fuel cell (LFFC) with air-breathing cathode for performance (fuel utilization and power density). The effect of flow-over and flow-through anode architectures, as well as operating conditions such as different fuel flow rates and concentrations on the performance of LFFCs was investigated. Formic acid with concentrations of 0.5 M and 1 M in a 0.5 M sulfuric acid solution as supporting electrolyte were exploited with varying flow rates of 20, 50, 100 and 200 µl/min. Because of the improved mass transport to catalytic active sites, the flow-through anode showed improved maximum power density and fuel utilization per single pass compared to flow-over planar anode. Running on 200 µl/min of 1 M formic acid, maximum power densities of 26.5 mW/cm 2 and 19.4 mW/cm 2 were obtained for the cells with flow-through and flow-over anodes, respectively. In addition, chronoamperometry experiment at flow rate of 100 µl/min with fuel concentrations of 0.5 M and 1 M revealed average current densities of 34.2 mA/cm 2 and 52.3 mA/cm 2 with average fuel utilization of 16.3 % and 21.4 % respectively for flow-through design. The flow-over design had the corresponding values of 25.1 mA/cm 2 and 35.5 mA/cm 2 with fuel utilization of 11.1% and 15.7% for the same fuel concentrations and flow rate.

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Investigation of bubble effect in microfluidic fuel cells by a simplified microfluidic reactor

Cited by 41 publications

References 19 publications

Fabrication and Test of an Air-Breathing Microfluidic Fuel Cell

Fabrication and Test of an Air-Breathing Microfluidic Fuel Cell

Tailoring nanostructured catalysts for electrochemical energy conversion systems

Air-breathing membraneless laminar flow-based fuel cell with flow-through anode

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