用于燃料电池的芳香族聚合物电解质中正电子素的形成。

Positronium formation in aromatic polymer electrolytes for fuel cells.

作者信息

Kobayashi Y, Mohamed Hamdy F M, Ohira A

出版信息

J Phys Chem B. 2009 Apr 30;113(17):5698-701. doi: 10.1021/jp901471m.

PMID:19351120

Abstract

We measured the yield of positronium (Ps) in sulfonated aromatic proton conducting membranes for the polymer electrolyte fuel cell (PEFC) with and without -SO(2)- in their chemical structures by positron annihilation lifetime spectroscopy (PALS). It was observed that Ps formation is almost totally inhibited in the polymers without -SO(2)- such as sulfonated poly(ether ether ketone) (SPEEK). On the other hand Ps favorably forms in those with -SO(2)- as sulfonated polyether sulfone (SPES), which is due to the anti-inhibition effect of -SO(2)-. The high probability of Ps formation in these polymers enables the study of the free volume and the mechanism of gas permeation by PALS.

摘要

我们通过正电子湮没寿命谱（PALS）测量了用于聚合物电解质燃料电池（PEFC）的、化学结构中含有和不含有-SO(2)-的磺化芳族质子传导膜中正电子素（Ps）的产率。据观察，在没有-SO(2)-的聚合物如磺化聚（醚醚酮）（SPEEK）中，Ps的形成几乎完全受到抑制。另一方面，在含有-SO(2)-的聚合物如磺化聚醚砜（SPES）中，Ps易于形成，这是由于-SO(2)-的抗抑制作用。这些聚合物中Ps形成的高概率使得能够通过PALS研究自由体积和气体渗透机制。