Synthesis, characterization and water electrolyzer cell tests of poly(biphenyl piperidinium) Anion exchange membranes

The effect of the piperidinium structure on anion-exchange membranes for applications in alkaline water electrolysis cells

“…For example, Fan et al reported that the AEM comprising poly(bisarylimidazoliums), which exhibit enhanced steric hindrance at the C2 position, showed 93.6% remaining imidazolium units aer being treated with 10 M KOH at 80 °C for 240 h. 17 The AEMWE cell using this membrane and 6 M KOH was operable at 60 °C at constant current density (400 mA cm −2 ) for 48 h. Caielli et al reported that polybiphenyl-based AEMs with piperidinium groups showed almost no decomposition aer immersion in 1 M KOH at 80 °C for 360 h and the thin membrane was applicable to an AEMWE cell with good performance (1.25 A cm −2 at 2.0 V with 1 M KOH at 60 °C). 18 In addition to the higher alkaline stability, the piperidiniumbased AEMs exhibited slightly higher ion conductivity and mechanical stability than the imidazolium-based AEMs. 19 The aforementioned polybiphenyl-based AEMs with piperidinium groups reported by Caielli et al showed a high hydroxide ion conductivity of 185 mS cm −1 at 80 °C and elongation at break of 101%.…”

“…For example, Fan et al reported that the AEM comprising poly(bis-arylimidazoliums), which exhibit enhanced steric hindrance at the C2 position, showed 93.6% remaining imidazolium units after being treated with 10 M KOH at 80 °C for 240 h. 17 The AEMWE cell using this membrane and 6 M KOH was operable at 60 °C at constant current density (400 mA cm −2 ) for 48 h. Caielli et al reported that polybiphenyl-based AEMs with piperidinium groups showed almost no decomposition after immersion in 1 M KOH at 80 °C for 360 h and the thin membrane was applicable to an AEMWE cell with good performance (1.25 A cm −2 at 2.0 V with 1 M KOH at 60 °C). 18…”

“…19 The aforementioned polybiphenyl-based AEMs with piperidinium groups reported by Caielli et al showed a high hydroxide ion conductivity of 185 mS cm −1 at 80 °C and elongation at break of 101%. 18 Furthermore, Buggy et al reported that a triblock copolymer-based AEM containing piperidinium groups exhibited a high ion conductivity of 179 mS cm −1 at 80 °C and elongation at break of 61%. 20 While several piperidinium-based AEMs can be found in the literature, only a few reports are available on the systematic study of the effects of the substituents and bonding position of the piperidinium head groups on the membrane properties.…”

N‐Methylquinuclidinium‐Based Anion Exchange Membrane with Ultrahigh Alkaline Stability

“…After 80 h, the voltage maintains at ≈2.1 V with insignificant fluctuations, demonstrating the high stability of our AEM (Figure 6b). The current density or stability of our AEMWE are superior to most of state-of-the-art PGM free AEMWE, [32][33][34][35][36][37] and even some PGM AEMWE [23,38] (Table S4, Supporting Information).…”

Polyolefin‐Based Anion Exchange Membranes with Superior Performance and Long‐Term Durability for Green Hydrogen Production

“…[13][14][15] Recently, most of the research focused on the preparation of membranes starting from aryl-ether free backbones, able to confer superior mechanical properties and adequate chemical stability over time. [2,3,[16][17][18][19] One of the most common procedures is based on the radiation grafting of a mixture of vinyl benzyl chloride (VBC) and vinylbenzene onto LDPE/HDPE substrates, triggered by highly energetic X-, 𝛽or 𝛾rays. [20,21] Then, the grafted VBC is generally converted into a quaternary ammonium salt by reaction with trimethylamine (TMA) to form the anion exchange sites.…”