Enhancing comprehensive performance of cross-linked PBI-based high-temperature proton exchange membranes: effectively doping a tetraphosphoric acid proton conductor
Source abstract
Abstract
The zirconium ethylenediamine tetramethylene phosphonate (ZrEDTMPS) proton conductor with –PO3H2 groups which can easily form hydrogen bonds and encourage proton transfer in low RH is synthesized and doped into the PBI-based membranes. The epoxy groups of tetrafunctional N, N, N’, N’-tetraglycidy-4,4`-diaminodiphenylmethane (TGDDM) react with the NH groups in polybenzimidazole (PBI) and form a cross-linking network structure to improve the mechanical properties, oxidative stability and dimensional stability of the composite membranes. At 180 °C, the proton conductivity of the mPBI-TGDDM (10%)/ZrEDTMPS (30%) is 0.122, 0.050, and 0.029 S cm−1 at 100%, 50%, and 0 RH, respectively. Meanwhile, the mPBI-TGDDM/ZrEDTMPS membranes exhibit high oxidative stability (the mass loss of membranes is 2.1%). Compared with Nafion 117 (5.5 × 10−7 cm2 s−1), the methanol permeability of mPBI- TGDDM/ZrEDTMPS membrane at 70 °C (6.38 × 10–8 cm2 s−1) is one order of magnitude lower. The mPBI-TGDDM/ZrEDTMPS membranes have good comprehensive performance and can be used in proton exchange membrane fuel cells.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fuel Cells and Related Materials · Membrane-based Ion Separation Techniques · Electrocatalysts for Energy Conversion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (66)
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