Arylether-type polybenzimidazoles bearing benzimidazolyl pendants for high-temperature proton exchange membrane fuel cells

Li, Xiaobai; Wang, Peng; Liu, Zhenchao; Peng, Jinwu; Shi, Chengying; Hu, Wei; Jiang, Zhenhua; Liu, Baijun

doi:10.1016/j.jpowsour.2018.05.011

Cited by 79 publications

(40 citation statements)

References 62 publications

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“…For example, different PEMs based on BaZrO 3 nanoparticles, SrCeO 3 nanoparticles, and Fe 2 TiO 5 nanoparticles have been introduced by our groups. Furthermore, PBI is a basic polymer with low cost, which can be doped with strong acids to form PEMs with high proton conductivity . In recent years, PA‐PBI–based PEMs are extensively used in PEM fuel cells.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, PBI is a basic polymer with low cost, which can be doped with strong acids to form PEMs with high proton conductivity. 17,18 In recent years, PA-PBI-based PEMs are extensively used in PEM fuel cells. The interesting features of the PA-PBIbased PEMs for application in elevated temperatures include excellent endurance and good thermal/chemical properties due to its rigid aromatic backbone at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…10,15 The perovskite-type materials are mainly absorbing as inorganic fillers for PEMs at high temperatures due to the high thermal stability and suitable proton conductivity. 18,28 The perovskites with wide range of chemical and physical properties possess a chemical formula of ABO 3 , where A (A cations are 12-coordinated by oxygen and have a large ionic radius with similar size as the oxygen ion) and B (B cations are 6-coordinated by oxygen and have a small ionic radius, which situated in the octahedral holes between the closed pack AO-layers) are cations that are appropriate in these structures. The stable structure of perovskite oxides is because of their balanced geometry of basic atoms and their valences.…”

Section: Introductionmentioning

confidence: 99%

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Novel nanocomposite membranes based on PBI and doped‐perovskite nanoparticles as a strategy for improving PEMFC performance at high temperatures

2020

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Summary In this work, Sr2+ dopant effects of Ba0.9Sr0.1TiO3 and La0.9Sr0.1CrO3‐δ doped‐perovskite nanoparticles on increasing proton conductivity, fuel cell performance, and mechanical and thermal stability of polybenzimidazole‐based nanocomposite membranes were studied. The Sr2+ dopant creates cation vacancies in Ba0.9Sr0.1TiO3 doped‐perovskite nanoparticles and oxygen vacancies in La0.9Sr0.1CrO3‐δ doped‐perovskite nanoparticles. The oxygen vacancies, which decrease columbic repulsion between protons and positive ions, have a more important role than the cation vacancies. They provide high surface area and high interfacial interaction between La0.9Sr0.1CrO3‐δ doped‐perovskite nanoparticles, phosphoric acid, and polybenzimidazole for proton transfer and increase the proton conductivity of the nanocomposite membranes. In addition, the results of relative humidity effects showed that the ordered arrangement of oxygen vacancies of the La0.9Sr0.1CrO3‐δ doped‐perovskite nanoparticles creates a specific pathway in the nanocomposite membranes for increasing proton transfer in the presence of relative humidity. Furtheremore, at phosphoric acid doping level of 13 mol phosphoric acid per monomer unit, proton conductivity of the nanocomposite membranes containing 8 wt.% La0.9Sr0.1CrO3‐δ doped‐perovskite nanoparticles was obtained as 126 mS cm‐1 at 180°C and 6% relative humidity. The nanocomposite membrane showed the best performance and the power density of 0.62 W cm‐2 at 180°C and 0.5 V.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel nanocomposite membranes based on PBI and doped‐perovskite nanoparticles as a strategy for improving PEMFC performance at high temperatures

2020

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“…The PEM has a vital role in a fuel cell assembly by performing various functions such as being a carrier path for proton transport from the anode to the cathode side, a dense separation layer to block the mixing of the reactants, and an electric insulation layer between the anode and cathode. Many studies in the past few years have reported the enhancement of various functions of PEMs [26][27][28][29][30]. One of the key objectives for the PEMs' development is to reduce the cells' total fabrication cost and improve their electrochemical performance and durability [31,32].…”

Section: Desirable Properties Of Pemsmentioning

confidence: 99%

“…In the 'Grotthuss' mechanism known as the 'hopping' mechanism, a vehicle or proton solvent is not essential. Protons could simply jump from one site to another alongside the proton acceptor sites in the PEMs backbone [27,98]. Figure 4 displays a schematic diagram illustrating both the 'vehicular' and 'hopping' mechanisms for proton conduction paths in PEMs [99,100].…”

Section: Proton Conduction Mechanismmentioning

confidence: 99%

A Review of Recent Developments and Advanced Applications of High-Temperature Polymer Electrolyte Membranes for PEM Fuel Cells

et al. 2021

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This review summarizes the current status, operating principles, and recent advances in high-temperature polymer electrolyte membranes (HT-PEMs), with a particular focus on the recent developments, technical challenges, and commercial prospects of the HT-PEM fuel cells. A detailed review of the most recent research activities has been covered by this work, with a major focus on the state-of-the-art concepts describing the proton conductivity and degradation mechanisms of HT-PEMs. In addition, the fuel cell performance and the lifetime of HT-PEM fuel cells as a function of operating conditions have been discussed. In addition, the review highlights the important outcomes found in the recent literature about the HT-PEM fuel cell. The main objectives of this review paper are as follows: (1) the latest development of the HT-PEMs, primarily based on polybenzimidazole membranes and (2) the latest development of the fuel cell performance and the lifetime of the HT-PEMs.

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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

Peng

Wang

et al. 2022

Adv Funct Materials

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Cross-linking is widely accepted as an effective method to improve the mechanical strength and durability of phosphoric acid (PA) doped polybenzimidazole (PBI) membranes. However, the cross-linked membranes generally exhibit compromised overall performance since their compact network structures decrease the free volumes of membranes, leading to poor proton conductivity. In this study, a locally high-density cross-linked polybenzimidazole network based on pillar[5]arene bearing multiple alkyl bromide is constructed for the first time to achieve high proton conductivity, desired mechanical properties, and excellent fuel cell performance. The pillar[5]arene-crosslinked network considerably enhances the mechanical strength of membrane (14.6 MPa), particularly with high PA uptake, and provides loose PBI chain segment packing to retain PA (315.9%). Surprisingly, the pillar[5]arene-crosslinked PBI membrane displays a high-power density of 1,084.1 mW cm −2 at 180 °C and 0.6 mg cm −2 Pt loading without backpressure and humidification, that is the highest value reported in cross-linked membranes for high-temperature proton exchange membrane fuel cells.

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Arylether-type polybenzimidazoles bearing benzimidazolyl pendants for high-temperature proton exchange membrane fuel cells

Cited by 79 publications

References 62 publications

Novel nanocomposite membranes based on PBI and doped‐perovskite nanoparticles as a strategy for improving PEMFC performance at high temperatures

Novel nanocomposite membranes based on PBI and doped‐perovskite nanoparticles as a strategy for improving PEMFC performance at high temperatures

A Review of Recent Developments and Advanced Applications of High-Temperature Polymer Electrolyte Membranes for PEM Fuel Cells

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

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Arylether-type polybenzimidazoles bearing benzimidazolyl pendants for high-temperature proton exchange membrane fuel cells

Cited by 79 publications

References 62 publications

Novel nanocomposite membranes based on PBI and doped‐perovskite nanoparticles as a strategy for improving PEMFC performance at high temperatures

Novel nanocomposite membranes based on PBI and doped‐perovskite nanoparticles as a strategy for improving PEMFC performance at high temperatures

A Review of Recent Developments and Advanced Applications of High-Temperature Polymer Electrolyte Membranes for PEM Fuel Cells

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

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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