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@INPROCEEDINGS{Bostrm:1037739,
      author       = {Boström, Oskar and Choi, Seung-Young and Xia, Lu and
                      Lohmann-Richters, Felix and Jannasch, Patric},
      title        = {({P}oster {A}ward - {H}onorable {M}ention) {D}urable
                      {P}olybenzimidazole {A}nion {E}xchange {M}embranes for
                      {A}lkaline {W}ater {E}lectrolyzers},
      issn         = {2151-2043},
      reportid     = {FZJ-2025-00899},
      year         = {2023},
      abstract     = {Water electrolysis under alkaline conditions allows the use
                      of inexpensive non-platinum-group catalysts such as
                      nickel.1, 2 Conventional alkaline electrolyzers usually
                      employ a highly concentrated aq. KOH solution as electrolyte
                      (5-7 M) with a porous diaphragm as separator. Alternatively,
                      protolysable polymers such as polybenzimidazole (PBI) may be
                      swollen with electrolyte and used as ion-solvating
                      membranes.2, 3 However, the chemical stability of the
                      polymers can become a serious issue under these harsh
                      conditions. Operation under more dilute conditions, e.g., up
                      to 2 M KOH, may bring the benefits of the alkaline
                      conditions combined with a longer cell lifetime. Under these
                      conditions, aliphatic cyclic quaternary ammonium (QA)
                      cations, such as piperidinium, have shown excellent
                      stability.In the present work, performed as part of the EU
                      project "NEXTAEC", we have designed and synthesized m-PBI
                      grafted with mono- and bis-piperidinium functionalized side
                      chains, respectively (Figure 1a-b). AEMs were prepared from
                      polymers with varying ion exchange capacities and studied at
                      80 °C containing KOH solutions in the concentration range
                      0.5-2 M KOH. The membranes were characterized with respect
                      to, e.g., electrolyte solution uptake, alkaline stability,
                      and electrolyser performance (Figure 1c). The uptake showed
                      a strong inverse correlation with KOH concentration, which
                      also affected the electrochemical performance. The stability
                      as evaluated by 1HNMR spectroscopy was excellent showing, in
                      the worst case, less than 8 $\%$ ionic loss after 6 months
                      storage in 2 M KOH at 80 °C.},
      month         = {Oct},
      date          = {2023-10-08},
      organization  = {244th ECS Meeting, Gothenburg
                       (Sweden), 8 Oct 2023 - 12 Oct 2023},
      cin          = {IEK-14 / IET-4},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-14-20191129 / I:(DE-Juel1)IET-4-20191129},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)1},
      doi          = {10.1149/MA2023-02391889mtgabs},
      url          = {https://juser.fz-juelich.de/record/1037739},
}