English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Much work has been conducted on the substitutes for Nafion as proton exchange membrane materials. Some researches are focused on the heterogeneous multilayered membranes reported by R. Jiang (J. Electrochem. Soc. 153 (2006) A1554), B. Yang (Electrochem. Commun. 6 (2004) 231) and S. Ren (J. Membr. Sci. 247 (2005) 59). However, just as the dependence of methanol crossover upon the layer with the lowest permeability, the proton transfer ability is major confined by the layer with the poorest conductivity. Moreover, various swelling ratio and contractibility of sub-layers will make the hidden problems of separation between catalyst layer and proton exchange membrane become more obvious. We present here a multilayered membranes containing five thin layers of sulfonated poly(ether ether ketone)(SPEEK) and five thin layers of poly(vinyl alcohol)(PVA). SPEEK layers and PVA layers were located alternatively in the composite membrane. The swelling behaviors of PVA layer are restrained by both sideward SPEEK layers. Methanol crossover is ef- ficiently alleviated piece by piece without visible proton conductivity loss. The preliminary investigation in DMFC sug- gests its promising application as resisting methanol and proton exchange membrane. Keyword: Multilayered membrane, Double-layer membrane, Methanol crossover, DMFC.

Multilayer Membranes Based on Sulfonated Poly(Ether Ether Ketone) and Poly(Vinyl Alcohol) for Direct Methanol Membrane Fuel Cells