Macromol. Chem. Phys. 21/2007

Kim, Tae‐Ho; Lim, Tae‐Wook; Park, Yong‐Su; Shin, Kyusoon; Lee, Jong‐Chan

doi:10.1002/macp.200790040

Cited by 8 publications

(12 citation statements)

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“…2). ABPBI has been studied by Litt et al, 61 Akita et al, 62 by our group, [63][64][65] Kim et al, 55, 66 Krishnan et al, 67 J.-H. Lee et al, 68,69 J.-C. Lee et al, 70,71 Wannek et al, 72,73 Corti et al 74,75 and Bozkurt, 76 doped with PA. All have found that ABPBI absorbs much more acid than PBI when treated with identical phosphoric acid solutions. Furthermore, ABPBI membranes have the same performance as PBI under the same conditions 60 and can be produced easily and more safely from a single cheap monomer.…”

Section: Alternative Pem Polymers Of the Benzimidazole Familymentioning

confidence: 99%

Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest

2010

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The development of high-temperature PEM fuel cells (working at 150-200 degrees C) is pursued worldwide in order to solve some of the problems of current cells based on Nafion (CO tolerance, improved kinetics, water management, etc.). Polybenzimidazole membranes nanoimpregnated with phosphoric acid have been studied as electrolytes in PEMFCs for more than a decade. Commercially available polybenzimidazole (PBI) has been the most extensively studied and used for this application in membranes doped with all sorts of strong inorganic acids. In addition to this well-known polymer we also review here studies on ABPBI and other polybenzimidazole type membranes. More recently, several copolymers and related derivatives have attracted many researchers' attention, adding variety to the field. Furthermore, besides phosphoric acid, many other strong inorganic acids, as well as alkaline electrolytes have been used to impregnate benzimidazole membranes and are analyzed here. Finally, we also review different hybrid materials based on polybenzimidazoles and several inorganic proton conductors such as heteropoly acids, as well as sulfonated derivatives of the polymers, all of which contribute to a quickly-developing field with many blooming results and useful potential which are the subject of this critical review (317 references).

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Section: Alternative Pem Polymers Of the Benzimidazole Familymentioning

confidence: 99%

Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest

2010

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“…Poly(2,5-benzimidazole) (ABPBI) has a similar structure and properties to PBI-ph [21,22] , and the monomer system for ABPBI synthesis is much simpler and cheaper. However, compared to PBI-ph, ABPBI is hard to be dissolved except in the strong acid such as sulfuric acid, etc.…”

Section: Introductionmentioning

confidence: 99%

Proton Conducting Membranes Based on Poly(2,2′‐imidazole‐5,5′‐bibenzimidazole)

Guan

Jin

et al. 2012

Fuel Cells

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Poly(2,2′‐imidazole‐5,5′‐bibenzimidazole) (PBI‐imi) was synthesized via the polycondensation between 3,3′,4,4′‐tetraaminobiphenyl and 4,5‐imidazole‐dicarboxylic acid. Effects of the reaction conditions on the intrinsic viscosity of the synthesized polymers were studied. The results show that the molecular weight of the polymers increases with increasing monomer concentration and reaction time, and then levels off. With higher reaction temperature, the molecular weight of the polymer is higher. With the additional imidazole group in the backbone, PBI‐imi shows improved phosphoric acid doping ability, as well as a little higher proton conductivity when compared with widely used poly[2,2′‐(m‐phenylene)‐5,5′‐bibenzimidazole] (PBI‐ph).Whereas, PBI‐imi and PBI‐ph have the similar chemical oxidation stability. PBI‐imi/3.0 H3PO4 composite membranes exhibit a proton conductivity as high as 10–4 S cm–1 at 150 °C under anhydrous condition. The temperature dependence of proton conductivity of acid doped PBI‐imi can be modeled by an Arrhenius equation.

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“…[17,18] The effect of various amounts of LiHzS on the mechanical properties It is possible that the use of 10 wt.-% of LiHzS in the composite membrane produced some phase separated domains, resulting in poorer mechanical properties as reported previously. [17,27] Other mechanical properties of PBI-LiHzS2.5 and PBI-LiHzS5, such as elongation at break and Young's modulus, are also close to those of PBI. These mechanical properties indicate that the PBI-LiHzS composite membranes have good mechanical stability that is suitable for use in high-temperature fuel cell membranes.…”

Section: Resultsmentioning

confidence: 72%

“…[19][20][21][22][23][24][25][26] Furthermore, some of the PBI composite membranes showed higher mechanical stability in comparison to PBI membranes with the same acid content. The inorganic compounds used for the composite membranes include phosphotungstic acid (H 3 PW 12 O 40 Á nH 2 O), [20] zirconium phosphate [Zr(HPO 4 ) 2 Á nH 2 O], [20] zirconium pyrophosphate (ZrP 2 O 7 ), [27] silicotungstic acid (H 4 SiW 12 O 40 Á nH 2 O), [20] zirconium tricarboxybutylphosphonate {Zr[O 3 PC(CH 2 ) 3 (-COOH) 3 ] 2 }, [21] boron phosphate (BPO 4 ), [22] silica nanoparticles, [23,24,28] and Cs 2.5 H 0.5 PMo 12 O 40 . [25] Lithium hydrazinium sulfate (LiN 2 H 5 SO 4 , LiHzS) has been known as a proton-conducting solid.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polybenzimidazole/Lithium Hydrazinium Sulfate Composite Membranes for High‐Temperature Fuel Cell Applications

Jung

Kim

Lee

2010

Macro Chemistry & Physics

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PBI‐LiHzS composite membranes were prepared by casting N,N'‐DMAc solutions containing PBI and LiHzS, where the LiHzS contents in the membranes were between 2.5 and 10 wt.‐%. LiHzS was obtained by reacting hydrazine sulfate and lithium carbonate in water. PBI‐LiHzS composite membranes were thermally stable up to approximately 300 °C and their acid‐absorbing capabilities were comparable to those of the pure PBI membranes. The proton conductivity of PBI‐LiHzS composite membranes (2.12 × 10−2 S · cm−1 at 180 °C and 0% RH) was higher than that of pure PBI membranes when used at the same acid doping levels. The mechanical stability of the composite membranes having less than 5 wt.‐% of LiHzS was found to be close to that of pure PBI membranes.magnified image

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Macromol. Chem. Phys. 21/2007

Cited by 8 publications

References 0 publications

Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest

Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest

Proton Conducting Membranes Based on Poly(2,2′‐imidazole‐5,5′‐bibenzimidazole)

Preparation of Polybenzimidazole/Lithium Hydrazinium Sulfate Composite Membranes for High‐Temperature Fuel Cell Applications

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