Bipyridine polybenzimidazole ionomer with optimized electrochemical boundaries enhanced power density of high-temperature proton exchange membrane fuel cells by 2.5 times

Wu, Aogui; Liu, Jianfa; Wei, Gongyi; Liu, Dong; Wang, Lei

doi:10.1016/j.jpowsour.2022.231925

Cited by 9 publications

(15 citation statements)

References 47 publications

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“…Absorption bands K (1012 cm −1 ) and L(947 cm −1 ) are attributed to benzene vibration and in‐plane deformation of benzene, respectively. Absorption bands C (3050 cm −1 ),J (1162 cm −1 ), and M (812 cm −1 ) are attributed to aromatic C─H stretching, ─O─stretching, and heterocyclic vibration, respectively, and absorption band D (2230 cm −1 ) is attributed to ─CN vibration [ 8,17,18,19 ] These results confirm that PBPBI‐3CN was successfully prepared.…”

Section: Resultsmentioning

confidence: 68%

“…[ 7 ] However, unlike in the HT‐PEM, PA cannot be effectively adsorbed on Pt in the CL, limiting the key proton conductivity. [ 8 ] The reaction primarily occurs on the thin boundary layer between the CL and HT‐PEM. If more mobile H + is kept around Pt within the CL; then, active sites on the surface of Pt can be sufficiently utilized, and the electrochemical performance of HT‐PEMFCs can be optimized.…”

Section: Introductionmentioning

confidence: 99%

“…However, only a few studies have focused on preparing and applying a binder with high electrochemical performance and good solubility in an environmentally friendly solvent. In our previous study, [ 8 ] a pyridine‐containing PBI (PyPBI) was synthesized. This increased the peak power density of HT‐PEMFC to 614 mW·cm −2 compared with that of commercial PTFE of 244 mW·cm −2 , and PyPBI was easy to dissolve in concentrated PA solutions that did not require removal.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen‐Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High‐Temperature Proton Exchange Membrane Fuel Cells

Gao

Wang

et al. 2023

Adv Funct Materials

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Polybenzimidazoles (PBIs) are the most promising binders for the catalyst layer (CL) in high‐temperature proton exchange membrane fuel cells (HT‐PEMFC). However, traditional commercial PBIs are not applied in binders because they do not enhance the electrochemical performance and because the related solvents are not environmentally friendly. In addition, proton transfer channels in PBIs are not investigated at the microscopic and atomic scales to date. In this study, a nitrogen‐rich rigid PBI binder containing pyridine, diazofluorene, and partially grafted nitrile (PBPBI‐3CN) is prepared with a functionalized structure, good thermal stability, and good solubility in an environmentally friendly solvent. A membrane electrode assembly (MEA) is fabricated with the PBPBI‐3CN binder, providing a high peak power density, low resistance, and good stability. The protonation, hydrogen bond networks, and platform for proton transfer are confirmed in the CLs. The protonation of PBPBI‐3CN occurs in two steps. First, some phosphoric acid (PA) molecules bind to nitrogen‐containing acidophilic groups via preliminary protonation; second, multiple PA molecules then interact with nitrogen‐containing acidophilic groups via further protonation. With protonation as the foundation, a sufficient amount of PA molecules form a hydrogen bond network, and proton transfer channels are established.

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Section: Resultsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrogen‐Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High‐Temperature Proton Exchange Membrane Fuel Cells

Gao

Wang

et al. 2023

Adv Funct Materials

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“…Fuel cells comprising TMG/PBI-10 and PBI membranes exhibited peak power density values of 545.49 and 196.15 mW cm –2 , respectively. A comparison with previous reports indicates that the performance of the single cells proposed here requires further improvement. ,,,, The different components of PEM fuel cells (i.e., membrane electrode assembly, carbon paper, and catalysts) affect their performance. Therefore, considering these parameters, the performance of fuel cells comprising the as-synthesized membranes will be extensively investigated and optimized in future studies.…”

Section: Resultsmentioning

confidence: 76%

Guanidinium/Hydroxyl-Functionalized Polybenzimidazole for High-Temperature Proton Exchange Membrane Fuel Cell Applications

Ji,

Han,

et al. 2023

ACS Appl. Energy Mater.

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In this study, polybenzimidazole (PBI) functionalized with hydroxyl groups (OH-PBI) is synthesized by the polycondensation of 3,3′diaminobenzidine, 4,4′-dicarboxydiphenyl ether, and 2,5-dihydroxyterephthalic acid. To enhance the phosphoric acid uptake and proton conductivity of PBIbased membranes, tetramethylguanidinium-functionalized PBI (TMG/PBI) is synthesized by introducing guanidinium salts into OH-PBI. The as-prepared TMG/PBI-based membranes show good oxidization and thermal and dimensional stability. Owing to guanidinium functionalization, the TMG/ PBI-based membranes show higher PA uptake, PA retention, and proton conductivity values than pure PBI and OH-PBI-based membranes. Additionally, single fuel cells comprising TMG/PBI-10 exhibit a significantly higher maximum power density (545.49 mW cm −2 ) at 120 °C than those comprising pure PBI membranes (196.15 mW cm −2 ). Thus, the as-prepared TMG/PBI-X membranes are promising materials for high-temperature proton exchange membrane fuel cell applications.

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“…This result was attributed to the improved proton conductivity achieved in CQD-cNafion-0.75. Next, the effect of the CQD coating on the membrane–electrode interfacial activity was evaluated by measuring their charge transfer resistance. , At 1.6 and 1.8 V, a smaller semi-circle was observed in CQD-cNafion-0.75 than in Nafion-212. This observation confirmed that applying a CQD coating increased the membrane–electrode interfacial activity.…”

Section: Resultsmentioning

confidence: 99%

Development of High-Performance Polymer Electrolyte Membranes through the Application of Quantum Dot Coatings to Nafion Membranes

Min

Munsur²,

Paek

et al. 2023

ACS Appl. Mater. Interfaces

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Proton exchange membrane water electrolysis (PEMWE) generates oxygen and hydrogen at the anode and cathode, respectively, by conducting protons generated at the anode to the cathode through a proton exchange membrane (PEM). The performance of PEMWE can be improved with faster catalytic reactions at each electrode; thus, the development of a PEM with excellent ionic conductivity and physicochemical stability is essential. Nafion, a type of perfluoro-sulfonic acid polymer, is the most widely used PEM material. However, despite its excellent conductivity and chemical stability, it exhibits high hydrogen permeability due to its structural characteristics. Quantum dots (QDs) have a hydrophilic functional group that can act as an ion conductor and are extremely compatible with the hydrophilic cluster of Nafion due to their characteristic nanosized structure. In this study, various compositions of N-doped carbon quantum dots (CQDs) containing hydrophilic functional groups were coated on a Nafion-212 membrane. The resulting series of CQD-coated Nafion membranes exhibited improvements in morphology and ionic conductivity as well as reductions in hydrogen permeability. In particular, the Nafion membrane coated with 0.75 wt % of N-doped CQD (CQD-cNafion-0.75) exhibited improved mechanical properties and higher oxidation stability compared to Nafion-212. It also displayed higher ionic conductivity of 240.3 mS cm‑1 at 80 °C and reduced hydrogen permeability (about 10% reduction) compared to Nafion-212. In addition, the performance of single-cell PEMWE using the CQD-cNafion-0.75 membrane was found to be approximately 1.2 times higher than Nafion-212.

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Bipyridine polybenzimidazole ionomer with optimized electrochemical boundaries enhanced power density of high-temperature proton exchange membrane fuel cells by 2.5 times

Cited by 9 publications

References 47 publications

Nitrogen‐Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High‐Temperature Proton Exchange Membrane Fuel Cells

Nitrogen‐Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High‐Temperature Proton Exchange Membrane Fuel Cells

Guanidinium/Hydroxyl-Functionalized Polybenzimidazole for High-Temperature Proton Exchange Membrane Fuel Cell Applications

Development of High-Performance Polymer Electrolyte Membranes through the Application of Quantum Dot Coatings to Nafion Membranes

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