Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (5): 757-760.DOI: 10.12068/j.issn.1005-3026.2015.05.032

• 化学 • Previous Articles    

Measurement of the Methanol Permeability of Polybenzimidazole Membrane Electrolytes with Cyclic Voltammetry

YANG Jing-shuai, LI Xue-yuan, XU Yi-xin, HE Rong-huan   

  1. School of Sciences, Northeastern University, Shenyang 110819, China.
  • Received:2014-04-04 Revised:2014-04-04 Online:2015-05-15 Published:2014-11-07
  • Contact: HE Rong-huan
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Abstract: A method for measuring the methanol permeability of phosphoric acid doped polybenzimidazole (PBI) membranes was developed by using cyclic voltammetry (CV). The methanol permeability of PA doped PBI membranes at different acid doping levels was investigated under a voltage range of -0.2~1.2V and at a potential sweep rate of 100mV/s using phosphoric acid solutions as electrolytes. The results indicated that using the PA solution with a suitable concentration as the electrolyte could maintain the acid doping level of the PBI membrane and ensure a precise and reliable result. Compared with that of the pure PBI membrane (1.34×10-8cm2/s), the methanol permeability of acid doped PBI membranes increased, i.e., 3.2×10-8~14×10-8cm2/s, corresponding to the acid doping level of 2.5~3.2.

Key words: methanol permeability, cyclic voltammetry, polybenzimidazole membrane, phosphoric acid, fuel cell

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