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A Review on Ionic Liquids-Based Membranes for Middle and High Temperature Polymer Electrolyte Membrane Fuel Cells (PEM FCs).

Int J Mol Sci · 2021 · PMC8196583 · PMID 34063925

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an increasing trendno p-value reported
It was found that the proton conductivity of composite membranes containing PA/PBI, PA/PMC 6 /PBI, and PA/PDC 3 /PBI demonstrated an increasing trend by increasing the temperature up to 180 °C.

also in 63,971 other papers

a decreasing trendno p-value reported
The results illustrated that the conductivity of membranes was increased by raising the temperature from 30 to 90 °C, although pristine SPEEK membrane showed a decreasing trend by increasing temperature.

also in 47,180 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.