Sulfonated poly(2,5-benzimidazole) (ABPBI)/ MMT/ ionic liquids composite membranes for high temperature PEM applications

Bao, Xujin; Zhang, Fan; Liu, Qingting

doi:10.1016/j.ijhydene.2015.07.127

Cited by 36 publications

(26 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conductivity value is reasonably good in anhydrous condition . Many systems with PBIs were reported with high proton conductivity, but oxidative stability of most of the PBIs was not investigated/known . In 30 LMP, a reduction in proton conductivity was observed at temperature > 100 °C.…”

Section: Resultsmentioning

confidence: 99%

Polybenzimidazole as proton conducting filler in polydimethylsiloxane: Enhanced oxidative stability and membrane properties

Kumar

Sana

Unnikrishnan

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this work, pyridine‐based low‐molecular‐weight polybenzimidazole (LMP) was synthesized (inherent viscosity: 0.52 dL g−1) by controlling the reaction time. The synthesized LMP was incorporated into polydimethylsiloxane (PDMS) matrix to impart proton conductivity. The composite membrane containing 30 wt % of LMP exhibited proton conductivity of 16 mS cm−1 at 100–120 °C. The LMP chains were bundled and formed clusters (aggregates) in the PDMS matrix as observed in field emission scanning electron microscopy. This is attributed to nonpolar (siloxane)–polar (polybenzimidazole) repulsion. An impressive weight loss of 8.6% was observed after 120 h Fenton's test that indicates the high oxidative stability of composite membranes. However, elongation of composite membranes was decreased compared to that of pristine PDMS, which is attributed to the incorporation of rigid LMP chains. The resultant composite membranes exhibited moderate proton conductivity, low moisture absorption, and good thermal stability. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48151.

show abstract

Section: Resultsmentioning

confidence: 99%

Polybenzimidazole as proton conducting filler in polydimethylsiloxane: Enhanced oxidative stability and membrane properties

Kumar

Sana

Unnikrishnan

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Trapping heteropolyacid (HPA) in clay and doping with ILs are other approaches to increase the proton conductivity of clay without destroying the silicate layers.…”

Section: Organic‐inorganic Polymer Composite Pemsmentioning

confidence: 99%

“…ILs are salts comprised of organic cations such as pyridinium, pyrrolidinium, imidazolium, ammonium, sulfonium etc., and soft anions such as trifluoromethanesulfonate (CF 3 SO 3 − ), bis(trifluorometanesulfonyl) imide (N(CF 3 SO 2 ) 2 − ), tetrafluoroborate (BF 4 − ) and hexafluorophosphate (PF 6 − ) . They exist in a liquid state at room temperature . Figure S12 shows some ions frequently used in ILs.…”

Section: Organic‐inorganic Polymer Composite Pemsmentioning

confidence: 99%

“…PILs with high proton conductivity have often been used, while AILs with low conductivity have received less attention . PILs are attractive for use in composite PEMs as an excellent proton conductor with low volatility, non‐flammability, high thermal stability and attractive electrochemical properties, particularly at high temperature and under anhydrous conditions . Solution casting and the IL swelling method have been applied to IL‐based composite membranes .…”

Section: Organic‐inorganic Polymer Composite Pemsmentioning

confidence: 99%

See 1 more Smart Citation

Non‐Fluorinated Polymer Composite Proton Exchange Membranes for Fuel Cell Applications – A Review

2019

View full text Add to dashboard Cite

The critical component of a proton exchange membrane fuel cell (PEMFC) system is the proton exchange membrane (PEM). Perfluorosulfonic acid membranes such as Nafion are currently used for PEMFCs in industry, despite suffering from reduced proton conductivity due to dehydration at higher temperatures. However, operating at temperatures below 100 °C leads to cathode flooding, catalyst poisoning by CO, and complex system design with higher cost. Research has concentrated on the membrane material and on preparation methods to achieve high proton conductivity, thermal, mechanical and chemical stability, low fuel crossover and lower cost at high temperatures. Non‐fluorinated polymers are a promising alternative. However, improving the efficiency at higher temperatures has necessitated modifications and the inclusion of inorganic materials in a polymer matrix to form a composite membrane can be an approach to reach the target performance, while still reducing costs. This review focuses on recent research in composite PEMs based on non‐fluorinated polymers. Various inorganic fillers incorporated in the PEM structure are reviewed in terms of their properties and the effect on PEM fuel cell performance. The most reliable polymers and fillers with potential for high temperature proton exchange membranes (HTPEMs) are also discussed.

show abstract

“…well as dimensional, thermal, and chemical stability, these composites are expected to produce more dimensionally stable membranes at low cost [32]. In relevant studies, natural minerals with micro-or nano-size porous, laminar, or channeled structures, such as sepiolite [33][34][35][36][37], bentonite [38], laponite [32,39], montmorilonite [40,41], and palygorskite [42] have been reported for the preparation of PEMs. The results indicate that high proton conductivities can be achieved by additional proton transfer through the absorbed or bound water molecules in clays via vehicle and/or Grotthuss mechanisms.…”

Section: Pamentioning

confidence: 99%

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

Zhang

Liu

Xia

et al. 2019

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

To broaden the operating temperature range of phosphoric acid (PA) doped polybenzimidazole membrane-based proton exchange membrane fuel cells (PEMFCs) toward low temperatures, a novel series of poly(2,5-benzimidazole) (ABPBI)/sulfonated sepiolite (S-Sep) composite membranes (ABPBI/S-Sep) with low PA doping levels (DLs) were prepared via in-situ synthesis. The desirably enhanced mechanical, thermal, and oxidative stabilities of ABPBI/S-Sep composite membranes were achieved by constructing ABPBI chains arranged along the sepiolite (Sep) fibers 2 and acid-base crosslinks formed between S-Sep fibrous particles and ABPBI chains. Benefiting from the richness of high temperature stable bound water and the excellent water absorbability of Sep particles that enable the formation of additive proton conducting paths, the composite membranes retained bounded PA and achieved much higher proton conductivities under both anhydrous and hydrous conditions compared to PA-doped ABPBI membranes. Proton conductivity values above 0.01 S/cm at 40-90 °C/20-98% RH conditions and 90-180 °C/anhydrous conditions as well as peak power density of 0.13 and 0.23 W/cm 2 at 80 and 180 °C with 0% RH, respectively from the ABPBI/2S-Sep composite membrane are more holistic compared to Nafion at low temperatures and polybenzimidazole-based membranes at high temperatures, respectively. The excellent properties of ABPBI/S-Sep composite membranes suggest them as prospective candidates for PEMFCs applications in a wide temperature range.

show abstract

Sulfonated poly(2,5-benzimidazole) (ABPBI)/ MMT/ ionic liquids composite membranes for high temperature PEM applications

Cited by 36 publications

References 20 publications

Polybenzimidazole as proton conducting filler in polydimethylsiloxane: Enhanced oxidative stability and membrane properties

Polybenzimidazole as proton conducting filler in polydimethylsiloxane: Enhanced oxidative stability and membrane properties

Non‐Fluorinated Polymer Composite Proton Exchange Membranes for Fuel Cell Applications – A Review

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

Contact Info

Product

Resources

About