Novel double cross-linked membrane based on poly (ionic liquid) and polybenzimidazole for high-temperature proton exchange membrane fuel cells

Anchoring Highly Sulfonated Hyperbranched PBI onto oPBI: Fast Proton Conduction with Low Leaching

“…Several methods have been developed to address these issues. Covalent cross-linking could effectively retard the decline in mechanical strength at a high doping level of proton conductors. − Multilayered membranes exhibited good PA retention ability and mechanical property. , Inorganic acids are anchored onto polymers, ionic liquids, and additives such as silica, graphene oxide, and carbon nanotubes. ,− Encapsulation or intercalation of inorganic acids is also effective in alleviating acid leaching. − During recent years, insoluble organic-inorganic hybrid proton conductors such as phosphonates, sulfophenyl phosphates, and phytates were also developed by our research group. − Doping of such proton conductors could enhance the mechanical property at certain doping levels, and avoid leaching and phase separation problems due to their inorganic–organic nature and insolubility. However, during preparation of such proton conductors, the hydroxyl groups in the phosphonic acid groups partially react with metal ions to ensure the insolubility, which reduces the content of the proton-conducting groups and affects the conductivity.…”

Achieving over 1,000 mW cm−2 Power Density Based on Locally High‐Density Cross‐Linked Polybenzimidazole Membrane Containing Pillar[5]arene Bearing Multiple Alkyl Bromide as a Cross‐Linker

“…The structural superiority of locally high-density cross-linked networks based on pillar [5]arenes can be demonstrated via rational comparison with previously reported cross-linked membranes (Figure 5a). [25,[30][31][32][35][36][37] More importantly, the significantly enhanced mechanical properties of the pillar [5]arene-cross-linked membranes are helpful for comprehensive fuel cell performance.…”

High‐Performance Poly(biphenyl acetylpyridine) and Poly(ether ketone cardo) Blend Membranes for High‐Temperature Polymer Electrolyte Membrane Fuel Cells

“…Owing to the stretching vibration, the characteristic peaks of aliphatic C-H bonds from PBAP appeared at 2978 cm −1 , while the peaks at 798 cm −1 and 1056 cm −1 are caused by the deformation vibration of C-H bonds. [10,39] As to the pure PEKC, the characteristic peak at 1787 cm −1 is attributed to the stretching vibration of the lactone ring (O-C=O) in the PEKC main chain. [21] For the blend membranes, the above absorption peaks pertaining to PBAP and PEKC could be detected in their IR spectra.…”

“…8.3 MPa) was equivalent to or even better than that of other HT-PEMs. For example, the tensile strength of the PA doped imidazolium ionic liquid grafted PTP membrane (PTP-PMIM/323%PA) was 4.5 MPa [26] ; that of the double crosslinked membrane (NbPBI-TSPDO 30 ) was 6.2 MPa [10] ; that of the 1-decyl-2-methylimidazolium grafted PSU membrane (CMPSU-M-5#) achieved 7.2 MPa. [35] Figure 4B depicts the proton conductivities of different PBAP-x%PEKC/PA membranes without humidifying.…”

“…[6] Due to the superior anhydrous proton conductivity at high temperatures and good thermal stability, a series of PBI/PA-based membranes have been regarded as the most competitive HT-PEMs. [5,[7][8][9][10] As reviewed recently, kinds of PBI derivatives have been developed. [1,7] Nevertheless, PBI-based HT-PEMs suffer from limited solubility in a typical polar solvent and the carcinogenicity of 3,3′,4,4′-tetraaminobiphenyl monomer.…”