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@ARTICLE{Hou:907595,
      author       = {Hou, Hui and Mariani, Alessandro and Suo, Yanpeng and Gao,
                      Xinpei and Giffin, Jürgen and Rodenbücher, Christian and
                      Passerini, Stefano and Korte, Carsten},
      title        = {{T}uning {P}olybenzimidazole {M}embrane by {I}mmobilizing a
                      {N}ovel {I}onic {L}iquid with {S}uperior {O}xygen
                      {R}eduction {R}eaction {K}inetics},
      journal      = {Chemistry of materials},
      volume       = {34},
      number       = {10},
      issn         = {0897-4756},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2022-02099},
      pages        = {acs.chemmater.1c03819},
      year         = {2022},
      abstract     = {Protic ionic liquid (PIL) is a promising nonaqueous
                      electrolyte alternative to replacing phosphoric acid for
                      fuel cells operating at temperatures above 100 °C. In this
                      study, the physical and electrochemical properties of
                      stoichiometric and nonstoichiometric PILs are investigated
                      focusing on their acid/base ratio. The study involves a
                      series of PILs, generically indicated as
                      N,N-diethyl-3-sulfopropane-1-ammonium
                      trifluoromethanesulfonate ([DESPA+][TfO–]), varying from
                      an excess of the proton acceptor
                      (N,N-diethyl-3-aminopropane-1-sulfonic acid) to an excess of
                      the proton donor (trifluoromethanesulfonic acid, TfOH).
                      Compared to a state-of-the-art electrolyte, i.e.,
                      concentrated phosphoric acid, the nonstoichiometric
                      [DESPA+][TfO–] shows superior oxygen reduction reaction
                      kinetics on the investigated Pt catalysts and oxygen
                      permeation ability (DO2·cO2). [DESPA+][TfO–] with a
                      base-to-acid molar ratio of 1:2 achieves a current density
                      ∼10 times larger than that of concentrated phosphoric acid
                      at 110 °C and 0.8 V. Membranes including polybenzimidazole
                      as a host polymer and stoichiometric and nonstoichiometric
                      [DESPA+][TfO–] as the conductive electrolyte exhibit
                      promising properties in terms of thermal stability and
                      conductivity. At 120 °C and $40\%$ relative humidity,
                      conductivities of 2 and 16 mS cm–1 are achieved by the
                      membranes employing stoichiometric and excess acid
                      [DESPA+][TfO–], respectively.},
      cin          = {IEK-14},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000805874800005},
      doi          = {10.1021/acs.chemmater.1c03819},
      url          = {https://juser.fz-juelich.de/record/907595},
}