Effect of Water Flooding at Different Positions of Cathode Side on the Performance of Proton Exchange Membrane Fuel Cell

doi:10.7503/cjcu20230003

Abstract

Abstract:

The discharge of the water generated by the cathode of the fuel cell is mainly related to the catalytic layer， carbon paper， microporous layer and flow channel. The accumulation of generated water in these four parts will cause flooding. However， it is difficult to distinguish which part of the water flooding is caused by the accumulation during the operation of the fuel cell. In this paper， hydrophilic and hydrophobic treatment was carried out on different parts of the cathode side（catalytic layer， carbon paper， microporous layer， flow passage） to obtain local flooding in different parts. Then， the flooding situation of fuel cells was analyzed under different stoich， humidity， back pressure and other conditions. The test results show that with the decrease of stoich， the performance of the battery without hydrophobic treatment in carbon paper is the most serious decline， and the impedance arc radius of the battery is increased by 1.5 times. When the cathode was humidified at 10%， the performance of the cells without hydrophobic treatment in carbon paper and flow passage was poor， and the impedance are radius of the two cells was 50% larger than that of the cathode humidified at 60%； when the cathode is 100% humidified， the performance of the cell without hydrophobic treatment in carbon paper is the best， while that of the cell without hydrophobic treatment in the catalytic layer is the worst， and the impedance arc radius of the cell without hydrophobic treatment in the catalytic layer is twice as large as that of the cell with 10% humidification. With the decrease of back pressure， the performance of the cell without hydrophobic treatment of carbon paper decreased the most seriously， and the impedance arc radius of the cell under high back pressure was 50% smaller than that under low back compression.

Key words: Proton exchange membrane fuel cell, Electrochemical impedance spectroscopy, Flooding

CLC Number:

O646

TrendMD:

CHEN Yafeng, ZENG Liuli, GUO Wei. Effect of Water Flooding at Different Positions of Cathode Side on the Performance of Proton Exchange Membrane Fuel Cell[J]. Chem. J. Chinese Universities, 2023, 44(6): 20230003.

Figures/Tables 8

References 26

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Cell	Treatment	Catalyst layer	Carbon paper	Microporous layer	Channel
Cell 1	Catalyst layer without hydrophobic treatment	Catalyst layer A	Carbon paper B	Microporous layer B	Channel B
Cell 2	Carbon paper without hydrophobic treatment	Catalyst layer B	Carbon paper A	Microporous layer B	Channel B
Cell 3	Microporous layer low hydrophobic treatment	Catalyst layer B	Carbon paper B	Microporous layer A	Channel B
Cell 4	Channel without hydrophobic treatment	Catalyst layer B	Carbon paper B	Microporous layer B	Channel A

Cell	Treatment	Catalyst layer	Carbon paper	Microporous layer	Channel
Cell 1	Catalyst layer without hydrophobic treatment	Catalyst layer A	Carbon paper B	Microporous layer B	Channel B
Cell 2	Carbon paper without hydrophobic treatment	Catalyst layer B	Carbon paper A	Microporous layer B	Channel B
Cell 3	Microporous layer low hydrophobic treatment	Catalyst layer B	Carbon paper B	Microporous layer A	Channel B
Cell 4	Channel without hydrophobic treatment	Catalyst layer B	Carbon paper B	Microporous layer B	Channel A

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