Degradation behavior of proton exchange membrane fuel cells under hydrogen starvation in freezing conditions
Degradation behavior of proton exchange membrane fuel cells under hydrogen starvation in freezing conditions
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DOI：
10.1016/j.jpowsour.2021.230898
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发表时间：
2022-02
影响因子：
9.2
通讯作者：
Tao Wei;Wei Song;Xiaokang Yang;Endao Zhang;Ziyi Huang;Hongjie Zhang;Hongmei Yu;Z. Shao
中科院分区：
文献类型：
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作者：
Tao Wei;Wei Song;Xiaokang Yang;Endao Zhang;Ziyi Huang;Hongjie Zhang;Hongmei Yu;Z. Shao
质子交换膜燃料电池由于氢饥饿而遭受电池反转，这可能由于在冷冻条件下大量冰形成之后的氢通道堵塞而加剧。研究了传统阳极和耐反转阳极（RTA）在零下温度（−30 °C至−5 °C）下的电池反转退化。在冷冻电池反转期间，在低反转电压下观察到水电解平台，但不存在通常在零度以上温度下观察到的典型后续碳腐蚀平台。制冷试验表明，在冻结温度下的RTA的反转时间显着短于在零上温度。由于质子交换膜中水分扩散能力的降低，使电池的反转电压和内阻的变化趋势一致，从而证明了在冷冻电池反转过程中会发生局部缺水现象。300分钟累积的长期循环冻结逆转的RTA显示出低降解率。低温对碳载体和铂-碳催化剂氧化的抑制以及催化剂层中水含量对电池反转的影响解释了冷冻电池反转中的低降解速率。
Proton exchange membrane fuel cells suffer from cell reversal due to hydrogen starvation, which can be exacerbated by hydrogen channel blockage after extensive ice formation under freezing conditions. The cell reversal degradation of conventional anodes and reversal-tolerant anodes (RTAs) at sub-zero temperature (−30 °C to −5 °C) is investigated. During freezing cell reversal, a water electrolysis plateau is observed with a low reversal voltage, but the typical subsequent carbon corrosion plateau usually observed at above-zero temperature is absent. Reversal tests indicate that the reversal time of RTAs at freezing temperature is significantly shorter than that at above-zero temperature. Local water starvation can occur in freezing cell reversal, as evidenced by the consistent changing trend of the reversal voltage and internal resistance because of the reduced water diffusion capacity in the proton exchange membrane. The 300 min accumulated long-term cyclic freezing reversal of RTAs reveals a low degradation rate. The suppression of the sub-zero temperature on the oxidation of the carbon support and the platinum–carbon catalyst and the influence of the water content in the catalyst layer on cell reversal explain the low degradation rate in freezing cell reversal.