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首页> 外文期刊>RSC Advances >Chemical state changes of Nafion in model polymer electrolyte fuel cell under oxygen/hydrogen gas atmosphere observed by S-K XANES spectroscopy
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Chemical state changes of Nafion in model polymer electrolyte fuel cell under oxygen/hydrogen gas atmosphere observed by S-K XANES spectroscopy

机译：通过S-K XANES光谱观察到氧气/氢气气氛下模型聚合物电解质燃料电池中Nafion的化学状态变化

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Changes in the chemical states of the sulfonic groups of Nafion in a model polymer electrolyte fuel cell under an oxygen/hydrogen gas atmosphere were studied using sulfur K-edge XANES spectroscopy. First, the chemical state changes in the sulfonic acid groups of both cathode and anode electrodes due to humidity under oxygen/hydrogen gas flow were observed. Reversible spectral changes ascribed to the hydration and dehydration of the sulfonic acid group were observed at both electrodes. This result is similar to the experimental results obtained without introducing oxygen (helium/hydrogen). On the anode, some of the sulfonic acid groups were decomposed to atomic sulfur adsorbed on platinum (S _(ad) ) and the amount increased with time. On the cathode, the formation of S _(ad) was suppressed under the oxygen atmosphere. Next, the effects of oxygen gas introduction onto S _(ad) were examined. S _(ad) was at once formed on both electrodes under dry conditions without an oxygen supply. By supplying oxygen gas, S _(ad) on the cathode disappears. Therefore, the catalyst of the cathode has the ability to recover against the poisoning S _(ad) , while that on the anode accumulates.
机译：使用硫K边缘XANES光谱研究了在氧气/氢气气氛下模型聚合物电解质燃料电池中Nafion磺酸基化学状态的变化。首先，观察在氧气/氢气流下由于湿度引起的阴极和阳极的磺酸基团中的化学状态变化。在两个电极上均观察到归因于磺酸基的水合和脱水的可逆光谱变化。该结果类似于不引入氧气（氦/氢）而获得的实验结果。在阳极上，一些磺酸基团分解为吸附在铂上的原子硫（S _（ad）），其数量随时间增加。在阴极上，在氧气气氛下抑制了S _（ad）的形成。接下来，检查了氧气引入到S_（ad）上的影响。在没有氧气供应的干燥条件下，两个电极上都立即形成了S_（ad）。通过提供氧气，阴极上的S_（ad）消失。因此，阴极的催化剂具有抵抗中毒S _（ad）的能力，而阳极上的催化剂则积累。

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