A study on current overshoot during start-ups and optimal start-up strategy of proton exchange membrane fuel cells

Jia, Fei; Guo, Liejin; Liu, Hongtan

doi:10.1016/j.ijhydene.2015.01.051

Cited by 21 publications

(3 citation statements)

References 33 publications

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“…While studying PEMFCs, Jia et al reported that the degree of overshoot was significantly reduced with increasing relative humidity of the anode. 81 Therefore, in the case of AEMFCs, the degree of overshoot would similarly be reduced if the cathode RH is maintained close to 100 %. In this paper, a fixed RH of 90 % was used.…”

Section: Dynamic Water Distributionmentioning

confidence: 99%

Transient Distribution of Water in an Anion Exchange Membrane Fuel Cell Monitored by Operando Coherent Anti-Stokes Raman Scattering Spectroscopy

WAKOLO,

MIYATAKE,

INUKAI

2024

Electrochemistry

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The hydration condition of an anion exchange membrane (AEM) in an operating fuel cell significantly affects its performance as well as its lifespan. In this paper, an in-house build coherent anti-Stokes Raman scattering (CARS) vibrational spectroscopy is used to establish the hydration of an AEM in an anion exchange membrane fuel cell (AEMFC) while it generates power. During steady-state operation, water on the anode side increased with current density. On the cathode side and at the center of the membrane, water initially decreased with current density and then started increasing at a slower pace than on the anode side. A deconvolution of the OH peak in the recorded CARS spectra into nine species revealed that only the H-bonded water species underwent variation. The rest of the species experienced a negligible change. A transient study revealed that maximum disturbance to the water distribution was achieved after 5 s of applying a current jump. The distribution of water became stable within 20 s after applying the current jump. The response to the current jump on the anode side was opposite to that on the cathode. These results open the way for a widespread dynamic study of water distribution in different AEMFCs. The technique could also be directly used to evaluate the dynamic degradation of AEMs.

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Section: Dynamic Water Distributionmentioning

confidence: 99%

Transient Distribution of Water in an Anion Exchange Membrane Fuel Cell Monitored by Operando Coherent Anti-Stokes Raman Scattering Spectroscopy

WAKOLO,

MIYATAKE,

INUKAI

2024

Electrochemistry

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“…A current distribution measurement gasket [29][30][31] was placed between the gas diffusion layer and the flow field plate at the anode side to measure transient responses of local current densities along the flow direction, as shown in Figure 1, and the anode gas diffusion layer was segmented along the center of each channel to minimize the effect of lateral current 32,33 on the measured local current densities. 29 Meanwhile, since the internal current is much smaller than the operating current density, the wire is wound on hall sensor twenty times in order to improve the measurement accuracy. Thus, the value of internal current can be calculated from measured local current density divided by twenty is one twentieth of the measured value.…”

Section: Experimental System and The Fuel Cell Assemblymentioning

confidence: 99%

Dynamic characteristics of internal current during startups/shutdowns in proton exchange membrane fuel cells

2019

Self Cite

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Summary Studying dynamic characteristics of proton exchange membrane fuel cells (PEMFCs) during startups/shutdowns is of great importance to proposing strategies to improve fuel cell performance and durability. In this study, internal current during startup and shutdown processes in PEMFC is investigated, and effects of gas supply/shutoff sequences and backpressure are analyzed by measuring local current densities and the cell voltage in situ. The experimental results show that when reactants were fed/shut off, internal current occurs and variation patterns of local current densities along the flow channel are different. During startups, local current densities in the downstream drop to negative values and internal current can be eliminated when air is first supplied into the cell. While during shutdowns, the results show that negative currents occur in the upstream, and if hydrogen is shut off first, all local current densities remain constant at zero, indicating the effectiveness of gas shutoff sequence in eliminating/mitigating internal current in PEM fuel cells. Further experimental results show that the magnitude of internal current increases with the pressure difference between the anode and the cathode.

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“…Therefore, many people have also explored experimentally the effect of working conditions on the dynamic response of PEMFC under conditions of load changes [19][20][21][22][23][24][25][26][27][28][29][30][31]. Flow channel design has an important impact on the steady-state performance and dynamic response of PEMFC.…”

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confidence: 99%

An innovative 3D wave channel design for boosting the dynamic response of proton exchange membrane fuel cell stack

Fan

Xie²

2023

Preprint

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The dynamic response of proton exchange membrane fuel cell (PEMFC) is an appropriate metric for evaluating the vehicle’s PEMFC system. In this study, we compare the experimental results of two stacks, each with an effective area of 102.66 cm2 (14.5cm×7.08cm), and bipolar plates featuring parallel two-dimensional straight channel (2D) and three-dimensional wave channel (3D). We specifically investigate the effects of load mode, load change, stoichiometric ratio, temperature, back pressure, and humidity on the output performance of both stacks, using polarization curve and electrochemical impedance spectroscopy (EIS). The 3D wave channel outperforms the 2D straight channel in terms of reaction gas dispersion, enhancement of diffusion and mass transfer to the diffusion layer, reduction of concentration polarization in the PEMFC, and improved self-humidification under low humidity conditions. More importantly, our results show that the implementation of a 3D wave channel results in both an enhanced steady-state performance and improved dynamic response for the PEMFC.

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A study on current overshoot during start-ups and optimal start-up strategy of proton exchange membrane fuel cells

Cited by 21 publications

References 33 publications

Transient Distribution of Water in an Anion Exchange Membrane Fuel Cell Monitored by Operando Coherent Anti-Stokes Raman Scattering Spectroscopy

Transient Distribution of Water in an Anion Exchange Membrane Fuel Cell Monitored by Operando Coherent Anti-Stokes Raman Scattering Spectroscopy

Dynamic characteristics of internal current during startups/shutdowns in proton exchange membrane fuel cells

An innovative 3D wave channel design for boosting the dynamic response of proton exchange membrane fuel cell stack

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