Temperature distribution on anodic surface of membrane electrode assembly in proton exchange membrane fuel cell with interdigitated flow bed

Guo, Hang; Wang, Mao Hai; Liu, Jia Xing; Nie, Zhihua; Ye, Fang; Fang, Chong

doi:10.1016/j.jpowsour.2014.09.159

Cited by 56 publications

(21 citation statements)

References 34 publications

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“…Several reports indicate that the appearance of ceria turns from yellow to ad arker color (in the visible region)w hen it is reduced. [26,27) However,t he changes we observe in the NIR imaging experiments are not as straightforward to interpret because the changesi no ptical properties in the region of interest are subtle and the observed intensity changes depend on the experimental geometry. [31] Exposing ceria to reducing conditions has been reportedt or esult in small changes in the bandgapo fc eria [32] [at highere nergies (> 3.5 eV) than those directly pertinent to our emission wavelengths, > 720 nm, < 1.72 eV].T he most pertinent change is an increased index of refraction, [32,33]~2 .2 to 2.7, which is consistent with the reduced emission intensity observed under reducing conditions for ceria.…”

Section: Discussionmentioning

confidence: 99%

“…APXPS provides unique atomistic insight into operating electrochemical systems but the experiment involves expensive instrumentation and typically requires the use of model cells and conditions that only approximatea uthentic SOC devices.C omplementary techniques, such as operando Ramans pectroscopy [12][13][14][15][16][17][18] and near-infrared( NIR) imaging [19][20][21][22][23][24][25][26] are more widely accessible and cost-effective,b ut they provide different spectroscopic information and probe different properties of the electrode (e.g. vibrational modes,t hermal signatures).I na ddition, NIR imaging is ab ulk probe whereas APXPSi sasurface characterization tool and the combination can provide complementaryi nformation on an operating electrode.…”

Section: Introductionmentioning

confidence: 99%

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Operando Tracking of Electrochemical Activity in Solid Oxide Electrochemical Cells by using Near‐Infrared Imaging

et al. 2015

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Near‐infrared (NIR) imaging is used in conjunction with near ambient pressure X‐ray photoelectron spectroscopy (APXPS) to study chemical and electrochemical redox processes on a ceria‐based solid oxide electrochemical cell (SOC). Electrochemical water electrolysis tests conducted in ambient operating conditions on standard SOCs show that NIR imaging can be used to spatially resolve the electrochemically active regions associated with an accumulation of Ce3+. These effective emissivity changes are attributed to changes in optical properties (e.g. the index of refraction) of ceria that occur upon reduction. These data correlate strongly with APXPS measurements, simultaneously supporting the model (near ambient conditions and single‐sided cell setup required by APXPS experiments) and the ability to elucidate mechanistic details on an operating SOC using an inexpensive, convenient NIR imaging technique.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Operando Tracking of Electrochemical Activity in Solid Oxide Electrochemical Cells by using Near‐Infrared Imaging

et al. 2015

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“…The effect of operating current densities was examined with small non-uniform temperature distributions being visible at 0.424 A·cm −2 ; these heterogeneities were seen to increase with increasing current densities. Water formation also inhibited the imaging of the cathode temperature distribution in a study reported by Guo et al [46]. Despite this the authors were able to successfully image the anode (fuel side) of a PEMFC using a BaF 2 window.…”

Section: Single Frame Imagingmentioning

confidence: 95%

“…Water formation also inhibited the imaging of the cathode temperature distribution in a study reported by Guo et al [46]. Despite this the authors were able to successfully image the anode (fuel side) of a PEMFC using a BaF2 window.…”

Section: Single Frame Imagingmentioning

confidence: 96%

Thermal Imaging of Electrochemical Power Systems: A Review

2016

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The performance and durability of electrochemical power systems are determined by a complex interdependency of many complex and interrelated factors, temperature and heat transfer being particularly important. This has led to an increasing interest in the use of thermal imaging to understand both the fundamental phenomena and effects of operation on the temperature distribution and dynamics in these systems. This review describes the application thermal imaging and related techniques to the study of electrochemical power systems with the primary focus on fuel cells and batteries. Potential opportunities and directions for future research are also highlighted, indicating the wide scope for further insights to be gleaned using infrared thermal imaging techniques.

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“…After comparison, it is found that there are advantages and disadvantages of each form of flow channels. Some studies have been carried out with different channel designs, such as serpentine channel, [6][7][8] labyrinth channel, 8 bionic channel, 9,10 parallel channel, 6,8,11 spiral channel, 11 inter-digital channel, [12][13][14] channel with blocks, 15 and wavy shape channel. [16][17][18][19][20] Meenakshi and Ghosh 21 even reported a versatile flow field which is capable of facilitating five different flow modes: serpentine, interdigitated, counter, serpentineinterdigitated hybrid, and dead-end mode.…”

Section: Introductionmentioning

confidence: 99%

A parametric comparison of temperature uniformity and energy performance of a PEMFC having serpentine wavy channels

2018

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Summary Proton exchange membrane fuel cells (PEMFCs) are regarded as alternative energy sources because they are environment friendly and deliver no harmful emission. As its reliability and power generating efficiency is largely influenced by the temperature distribution, it is necessary to improve the temperature uniformity which is crucial in PEMFCs. To this end, this numerical study presents an attempt to optimize the flow channels via introducing wavy shape flow channels at the ribs. The numerical model is validated by experimental data available in the open literature. Two kinds of wavy shape flow channels are designed while straight flow channel is set as a reference. In the PEMFCs with wavy shape flow channels, the effects of the amplitude and wavelength on the thermal performance are simulated and analyzed. Results show that wavy shape flow channels provide better performance not only for thermal uniformity but also for PEMFC output power and efficiency. With lower amplitude and wavelength of wavy shape flow channels, the power can be promoted up to 3.69% and 7.26% for two kinds of wavy shaped flow channels compared with straight flow channel, respectively. The influences of amplitude and wavelength on the thermal uniformity and the output power are also analyzed. This paper provides a new insight to PEMFC flow channel designers.

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Temperature distribution on anodic surface of membrane electrode assembly in proton exchange membrane fuel cell with interdigitated flow bed

Cited by 56 publications

References 34 publications

Operando Tracking of Electrochemical Activity in Solid Oxide Electrochemical Cells by using Near‐Infrared Imaging

Operando Tracking of Electrochemical Activity in Solid Oxide Electrochemical Cells by using Near‐Infrared Imaging

Thermal Imaging of Electrochemical Power Systems: A Review

A parametric comparison of temperature uniformity and energy performance of a PEMFC having serpentine wavy channels

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