Journal
JOURNAL OF POWER SOURCES
Volume 211, Issue -, Pages 161-168Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.03.091
Keywords
Proton exchange membranes; Polybenzimidazole; Boron phosphate; Proton conductivity; Methanol vapor permeability
Funding
- Chinese National Science Foundation [20873081, 21073118]
- Nano project of Shanghai Municipal Science & Technology Commission [0952nm01300]
- Shanghai Leading Academic Discipline Project [J50101]
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The boron phosphate-poly(2,5-benzimidazole) (or BPO4-ABPBI) nanocomposite proton exchange membranes were prepared by preblending BPO4 nanoparticles to the 3,4-diaminobenzoic acid solution before its polycondensation. The phosphoric acid doped nanocornposite membrane possesses enhanced proton conductivity compared to the phosphoric acid doped pristine ABM membrane without BPO4 nanoparticles; and a maximum proton conductivity of 27.3 mS cm(-1) was observed in the phosphoric acid doped nanocomposite membrane consisting of 25% BPO4 nanoparticles at 180 degrees C under anhydrous condition. The enhancement of proton conductivity is attributed to the dangling hydroxyl or geminal hydroxyl groups of the excess phosphoric acid molecules on surface of the BPO4 nanoparticles based on density functional theory calculations. In addition, the blending of BPO4 nanoparticles significantly decreases the methanol vapor permeability through the membrane by about two-fold. (C) 2012 Elsevier B.V. All rights reserved.
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