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首页> 外文期刊>Journal of power sources >Analysis of cerium-composite polymer-electrolyte membranes during and after accelerated oxidative-stability test
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Analysis of cerium-composite polymer-electrolyte membranes during and after accelerated oxidative-stability test

机译:铈复合聚合物电解质膜在加速氧化稳定性试验期间和之后的分析

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The oxidative stability of membranes constructed from a composite of pristine sulfonated poly(arylene ether sulfone) and cerium was investigated by conducting an accelerated oxidative-stability test at the open-circuit voltage (OCV). The membranes were analyzed in situ through OCV and impedance measurements, cyclic voltammetry, and linear-sweep voltammetry to monitor the electrochemical properties during the stability test. Although the high-frequency resistance of a composite membrane was slightly higher than that of a pristine membrane because of the exchange of protons from the sulfonic acid with cerium ions, the composite membrane maintained its potential for much longer than the pristine membrane. The effect of the cerium ions as radical scavengers was confirmed by analyzing the drain water and chemical structure after operation. These post operation analyses confirmed that cerium ions improved the oxidative stability of the hydrocarbon-based polymer during fuel-cell operation. It is clear that the cerium-based radical scavengers prevented chemical degradation of the polymer membrane as well as the electrode in terms of hydrogen cross-over, polymer-chain scission, and the electrochemical surface area, while they rarely diffused outward from the membrane.
机译:通过在开路电压(OCV)下进行加速的氧化稳定性测试,研究了由原始磺化聚亚芳基醚砜和铈的复合材料制成的膜的氧化稳定性。通过OCV和阻抗测量,循环伏安法和线性扫描伏安法对膜进行原位分析,以监测稳定性测试期间的电化学性能。尽管由于磺酸与铈离子交换质子,复合膜的高频电阻略高于原始膜,但复合膜的电势比原始膜要长得多。铈离子作为自由基清除剂的作用已通过分析操作后的排水和化学结构得到了证实。这些操作后分析证实,铈离子改善了燃料电池操作过程中烃基聚合物的氧化稳定性。显然,基于铈的自由基清除剂在氢交叉,聚合物链断裂和电化学表面积方面阻止了聚合物膜以及电极的化学降解,而它们很少从膜向外扩散。

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