Proton exchange nanohybrid membranes with high phosphotungstic acid loading within metal-organic frameworks for PEMFC applications

Bei Zhang, Ying Cao, Zhen Li, Hong Wu, Yongheng Yin, Li Cao, Xueyi He, Zhongyi Jiang

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

A novel approach to in-situ synthesize and encapsulate phosphotungstic acid into the cavity of MIL-101(Cr) using Na2WO4·2H2O and Na2HPO4 as precursors is presented to increase the acid loading content (31.4 wt.%). The phosphotungstic acid-encapsulating MIL-101(Cr) (HPW@MIL101) is introduced in sulfonated poly(ether ether ketone) (SPEEK) to prepare SPEEK/HPW@MIL101 nanohybrid membranes for PEMFC applications. Due to the introduction of HPW@MIL101, proton-conducting nanochannels are constructed both in the cavity of MIL101 and at the interface between HPW@MIL101 and SPEEK. Meanwhile, due to the hygroscopicity of phosphotungstic acid, the membrane dehydration at elevated temperatures is alleviated. The proton conductivity at low relative humidity is remarkably enhanced. The nanohybrid membrane with 9 wt.% HPW@MIL101 exhibits proton conductivity of 272 mS cm−1 at 65 °C, 100% RH and 6.51 mS cm−1 at 60 °C, 40% RH, which are 45.5% and 7.25 times higher than those of pristine SPEEK membrane (187 mS cm−1 and 0.898 mS cm−1), respectively. The single H2/O2 fuel cell with SPEEK/HPW@MIL-9 membrane acquires the power density of 383 mW cm−2 at 100% RH, which is 27.2% higher than that of pristine SPEEK membrane. The peak power density of SPEEK/HPW@MIL-9 membrane at 55% RH is 2.97 times higher than that of pristine SPEEK membrane (79 mW/cm2).
Original languageEnglish (US)
Pages (from-to)186-194
Number of pages9
JournalElectrochimica Acta
Volume240
DOIs
StatePublished - Jun 20 2017
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-20

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry

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