Comparison of lifetime performance of PEMFC stacks with two cooling strategies under different humidity

Yang，Yunjie1; Bai，Minli1; Zhou，Zhifu2; Wu，Wei Tao3; Wei，Lei4; Lyu，Jizu5; Hu，Chengzhi1; Li，Yang1; Li，Yubai1; Song，Yongchen1

2024-10-01

10.1016/j.ijheatmasstransfer.2024.125870

International Journal of Heat and Mass Transfer   影响因子和分区

0017-9310

While reducing the size and Pt loading can achieve a lower proton exchange membrane fuel cell (PEMFC) stack cost, it is also very important to focus on the performance changes of the PEMFC stack during the long-term operation. A 3D PtCo catalysts long-term performance model is established in this study, and PEMFC stacks with one cooling unit per cell (1-cell stack) and three cells (3-cell stack) are employed as the computational domains, respectively. The effective area of each cell is 50 cm, and the changes in current density as well as effective catalytic area of PEMFC stacks with two cooling strategies before and after long-term operation under different humidity conditions are investigated at low Pt loadings. The results show that there are large differences in the output voltage and current density distributions between the three cells due to the poor membrane hydration affected by the non-uniform temperature distribution, although the 3-cell stack can significantly reduce the size. Localized catalyst degradation in both 3-cell and 1-cell stacks is closely related to the geometry of the cathodic flow field, and non-uniform catalyst degradation is found to increase the activation and mass transfer losses and change the distribution of current density within the membrane. In addition, the 3-cell stack is found to perform even better in terms of durability, especially under high humidity conditions, which provides a potential solution to improve the durability of PEMFC stacks operating in harsh conditions.

Cooling strategy Degradation PEMFC PtCo catalysts Stack

EI

英语

其他

20242516282961

Binary alloys ; Catalysts ; Cobalt alloys ; Cooling ; Current density ; Mass transfer ; Platinum ; Platinum alloys ; Proton exchange membrane fuel cells (PEMFC)

Precious Metals:547.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Heat Transfer:641.2 ; Mass Transfer:641.3 ; Electricity: Basic Concepts and Phenomena:701.1 ; Fuel Cells:702.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804

ENGINEERING

2-s2.0-85196210462

Scopus

1.Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian,116024,China
2.State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an,710049,China
3.School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing,210094,China
4.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.School of Mechanical Engineering,Guangdong Ocean University,Zhanjiang,524088,China

Yang，Yunjie,Bai，Minli,Zhou，Zhifu,et al. Comparison of lifetime performance of PEMFC stacks with two cooling strategies under different humidity[J]. International Journal of Heat and Mass Transfer,2024,231.

Yang，Yunjie.,Bai，Minli.,Zhou，Zhifu.,Wu，Wei Tao.,Wei，Lei.,...&Song，Yongchen.(2024).Comparison of lifetime performance of PEMFC stacks with two cooling strategies under different humidity.International Journal of Heat and Mass Transfer,231.

Yang，Yunjie,et al."Comparison of lifetime performance of PEMFC stacks with two cooling strategies under different humidity".International Journal of Heat and Mass Transfer 231(2024).