Dynamic response study of air-cooled proton exchange membrane fuel cell stack

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Progress in Natural Science: Materials International Pub Date : 2024-12-01 Epub Date: 2024-12-12 DOI:10.1016/j.pnsc.2024.11.006

Houchang Pei , Zhangda Liu , Jibing Chen , Liangbo Sun , Beihai Wang , Lu Xing , Shanshan Cai , Zhengkai Tu

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Abstract

The dynamic response is a critical performance indicator of air-cooled fuel cells, directly affecting their operation's stability and reliability. This paper experimentally investigated the impact of different operating conditions on the dynamic response characteristics of the air-cooled proton exchange membrane fuel cell (PEMFC) stack. The overvoltage of fuel cells at higher ambient temperatures is smaller after loading, and it takes a shorter time for fuel cells to recover to a stable level. Different air supply modes were investigated, results show that increasing the cathode gas flow rate helps reduce the overshoot voltage of the air-cooled PEMFC stack. A higher cathode flow rate enhances the oxygen concentration at the catalyst layer, helping to supplement the local gas shortage. In addition, as the gas pressure inside the stack is slightly lower than the ambient pressure when the air-cooled PEMFC operates with the exhaust mode, the overshoot voltage of the exhaust air supply mode is 15.8 % higher than that of the blow airflow mode under the same air fan speed (4500r/min). Increasing the load change rate leads to insufficient local gas supply without enough time to replenish, causing the cell's overshoot voltage to rise; the more significant the load change rate, the greater the cell's overshoot voltage. Reducing the anode pulse purging interval can reduce the cell output voltage fluctuation with limited effect.

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气冷质子交换膜燃料电池堆的动态响应研究

动态响应是气冷燃料电池的一项重要性能指标，直接影响其运行的稳定性和可靠性。实验研究了不同工作条件对气冷质子交换膜燃料电池（PEMFC）堆动态响应特性的影响。负载后燃料电池在较高环境温度下的过电压更小，燃料电池恢复稳定所需的时间更短。对不同送风方式进行了研究，结果表明，增加阴极气体流量有助于降低气冷式PEMFC堆的过调电压。较高的阴极流速提高了催化剂层的氧浓度，有助于补充局部气体短缺。此外，风冷式PEMFC在排风模式下运行时，由于堆内气体压力略低于环境压力，因此在相同风机转速（4500r/min）下，排风送风模式的过调电压比吹风送风模式的过调电压高15.8%。增加负荷变化率导致局部供气不足，没有足够的时间补充，导致电池的过调电压升高；负载变化率越显著，电池的超调电压越大。减小阳极脉冲吹扫间隔可以减少电池输出电压波动，但效果有限。

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来源期刊

Progress in Natural Science: Materials International 综合性期刊-综合性期刊

CiteScore

8.60

自引率

2.10%

发文量

2812

审稿时长

49 days

期刊介绍： Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.