Moisture dehumidification and its application to a 3 kW proton exchange membrane fuel cell stack

Chen, Ben; Wang, Minmin; Tu, Zhengkai; Gong, Xuan; Zhang, Haining; Pan, Mu; Cai, Yonghua; Wan, Zhongmin

doi:10.1016/j.ijhydene.2014.11.076

Cited by 32 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The homogeneous distribution of oxygen among cells is severely damaged despite the increase in oxygen concentration, resulting in an uneven voltage distribution and a slight increase in C V at high inlet pressures . At the operating temperature of 75 °C, the lower saturation vapor pressure of water results in less water in the gas phase and more liquid water in the stack, further increasing the inhomogeneity between its voltages under conditions of increased inlet pressures …”

Section: Resultsmentioning

confidence: 99%

“…42 At the operating temperature of 75 °C, the lower saturation vapor pressure of water results in less water in the gas phase and more liquid water in the stack, further increasing the inhomogeneity between its voltages under conditions of increased inlet pressures. 43 4.2. Impact of Inlet Gas Humidities and Stoichiometric Ratios on Fuel Cell Stack Performance.…”

Section: Impact Of Operating Temperature and Inletmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical and Experimental Study of a Fuel Cell Stack Based on Perfluoro-sulfonic Acid Membranes Facing High Temperature Application Environments

Lu,

Wu,

Yang

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

Elevating the operating temperature of fuel cell stacks based on perfluorosulfonic acid (PFSA) membranes is crucial for simplifying their cooling system and enhancing power density. In this study, we used a semiempirical model to correct the conductivity of the PFSA membrane at high temperatures and analyzed the impact of elevating the operating temperature and inlet pressure on the output performance, voltage consistency, internal water content, and dynamic response of a 10 kW rated power fuel cell stack. The results show that increasing the operating temperature leads to a significant decrease in the output performance of the stack, resulting in poor voltage consistency, large voltage fluctuations, and overshooting during the dynamic response. To mitigate the impact of higher temperatures on the saturated vapor pressure, increasing the inlet pressure of the stack can effectively improve the output and dynamic performance. Similarly, the net water drag coefficient (α NWD ) can be used to characterize and monitor the water transport process within the fuel cell. Its value is positively correlated to the operating temperature and inlet pressure. Increasing humidity on the cathode side promotes water back-diffusion, thereby improving the high-temperature operation of the stack.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Impact Of Operating Temperature and Inletmentioning

confidence: 99%

Theoretical and Experimental Study of a Fuel Cell Stack Based on Perfluoro-sulfonic Acid Membranes Facing High Temperature Application Environments

Lu,

Wu,

Yang

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…If the semiconductor cooler were applied, a large amount of vapor in the stack would rapidly condense into liquid water under a higher partial pressure of vapor, resulting in liquid accumulation and excessive flooding at the outlet. 33 It was also…”

Section: Effect Of Cathode Moisture Condensation On the Output Perfor...mentioning

confidence: 98%

“…29 The saturated vapor pressure of water also increases, leading to more water in the vapor phase and less liquid water in the stack. 33 Thus, the flooding was reduced, and the temperature distribution became more uniform. Moreover, it was found that the highest temperature always appeared at point 4, that is, near the outlet of the cooling water, and the lowest temperature always appeared at point 7, which was close to the semiconductor cooler.…”

Section: Effect Of Cathode Moisture Condensation On the Temperature D...mentioning

confidence: 99%

Effect of cathode moisture condensation on temperature distribution characteristics of dead‐ended proton‐exchange membrane fuel cell stack

Pei

Chang

et al. 2021

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

Thermal and water management are crucial factors affecting the performance of proton-exchange membrane fuel cells (PEMFCs). In this study, a semiconductor cooler was installed at the cathode outlet of a dead-ended fuel cell stack, to condense the water vapor in the stack, and subsequently realize efficient thermal and water management. The temperature distribution characteristics were experimentally studied using a self-built dead-ended PEMFC stack test platform. The effects of operating temperature, current density, and condensation temperature were analysed in detail. The results showed that the output performance of the dead-ended fuel cell stack could be efficiently improved by cathode moisture condensation. The temperature difference in the stack with cathode moisture condensation was much smaller than that without it. The output voltage of the stack could be increased by up to 6.02% with cathode moisture condensation, at an operating temperature of 70 C; and the maximum temperature difference could be reduced by 92.8% upon applying the semiconductor cooler with a condensation temperature of 5 C. Furthermore, the current density significantly affected the temperature distribution. Upon increasing the current density from 0.3 to 0.7 A/cm 2 , the temperature difference increased from 1.37 C to approximately 3 C, due to the large amount of water generated by electrochemical reaction at high current density.

show abstract

“…Water flooding would reduce the accessibility of oxygen to the reaction sites and thus decrease the cell performance. In fuel cell stacks, it was reported that the transmission of the liquid water close to the outlet by moisture dehumidification is able to improve the cell performance near the outlet , .…”

Section: Introductionmentioning

confidence: 99%

A Slope Right‐angle Turn Applied in the Flow Channel Promotes Water Management in Proton Exchange Membrane Fuel Cells

et al. 2018

View full text Add to dashboard Cite

Effective water removal and transport in the flow field is significantly important to the critical water management in proton exchange membrane fuel cells (PEMFCs). In this work, a slope turn was proposed in the hydrophobic channel of the multi‐serpentine flow field, and the transport and dynamics of water in the modified flow channel were numerically investigated with the volume‐of‐fluid method. The simulation results indicated that, with the presence of the slope turn, the water droplet can be effectively detached from the surface of the gas diffusion layer although the channel walls are hydrophobic. Meanwhile, the hydrophobic channel walls are beneficial to decrease interfacial resistance of water transport, avoiding water accumulation in the flow channel. The wall contact angle, slope angle and gas flow velocity are three important factors which significantly affect water behavior and pressure drop in the flow channel. For considered cases in this work, the appropriate wall contact angle, slope angle, and gas flow velocity were proved to be 140°, 110°, and higher than 2 m s−1, respectively.

show abstract

Moisture dehumidification and its application to a 3 kW proton exchange membrane fuel cell stack

Cited by 32 publications

References 25 publications

Theoretical and Experimental Study of a Fuel Cell Stack Based on Perfluoro-sulfonic Acid Membranes Facing High Temperature Application Environments

Theoretical and Experimental Study of a Fuel Cell Stack Based on Perfluoro-sulfonic Acid Membranes Facing High Temperature Application Environments

Effect of cathode moisture condensation on temperature distribution characteristics of dead‐ended proton‐exchange membrane fuel cell stack

A Slope Right‐angle Turn Applied in the Flow Channel Promotes Water Management in Proton Exchange Membrane Fuel Cells

Contact Info

Product

Resources

About