Title of Paper:Electrochemical Hydrogen Pump with SPEEK/CrPSSA SemiInterpenetrating Polymer Network Proton Exchange Membrane for H-2/CO2 Separation

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Date of Publication:2014-01-01

Journal:ACS SUSTAINABLE CHEMISTRY & ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:2

Issue:1,SI

Page Number:75-79

ISSN No.:2168-0485

Key Words:Electrochemical hydrogen pump; Hydrogen purification; Proton exchange membranes; Interpenetrating polymer networks; Sulfonated poly (ether ether ketone)

Abstract:The possibility of using a nonfluorinated proton exchange membrane for H-2/CO2 separation in an electrochemical hydrogen pump has been evaluated for the purpose of reducing cost. A sulfonated poly(ether ether ketone) (SPEEK)/cross-linked poly(styrene sulfonic acid) (CrPSSA) semi-interpenetrating polymer network membrane exhibits a much higher proton conductivity (0.09 S cm(-1) at 80 degrees C) and humidity sensitivity as compared with the pristine SPEEK membrane. Performance of the hydrogen pump with the sIPN membrane is investigated in different CO2 contents. The limiting currents are around 0.5-0.6 A and decrease with an increase in CO2 content, which indicates the transition the dominant resistance from ohmic resistance to mass transport resistance. Energy efficiency of the SPEEK/CrPSSA-based hydrogen pump is around 30%, which is only slightly lower than that of the Nafion-based hydrogen pump (around 40%) reported in the literature. The results presented here suggest that a nonfluorinated membrane-based hYdrogen pump could be promising for hydrogen purification.