Modifications on Promoting the Proton Conductivity of Polybenzimidazole-Based Polymer Electrolyte Membranes in Fuel Cells

Chen, Junyu; Cao, Jiamu; Zhang, Rongji; Zhou, Jing; Wang, Shimin; Liu, Xu; Zhang, Tinghe; Tao, Xinyuan; Zhang, Yufeng

doi:10.3390/membranes11110826

Cited by 16 publications

(10 citation statements)

References 130 publications

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“…Besides, their mechanical strength is also suitable as electrolytes for high-temperature PEMFC. However, the PBI and PEI based membranes obtained poor conductivity, which led to low cell performance [50], [51]. Thus, advanced modifications are required to enhance its conductivity and the PEMFC performance.…”

Section: Hydrocarbon Polymermentioning

confidence: 99%

Fabrication, Properties, and Performance of Polymer Nanocomposite Ion Exchange Membranes for Fuel Cell Applications: A Review

Daud

Norddin

Jaafar

et al. 2022

AMST

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The membrane in a fuel cell plays an essential role in permeating the ionic charges of positive and negative ions without passing the fuels and electrons through it. The membrane's common materials are perfluorinated polymer, non-fluorinated or hydrocarbon polymer, and natural polymer. The physicochemical properties of the membrane have the most significant influence on the performance of fuel cells in terms of mechanical stability, ionic conductivity, power output, and cell operation longevity. The incorporation of nanoparticles into polymeric-based materials improved the membrane's properties by suppressing fuel crossover, improving water retention, and increasing ionic mobility across the membrane. The effect of incorporating nanoparticles is determined by their type, size, shape, surface acidity, and relationship to the polymer matrix. The blending, sol-gel, and infiltration methods are used to develop the nanocomposite membrane. Compared to a commercial membrane in a fuel cell application, most of these membranes demonstrated superior cell performance. Based on published literature, this review briefly described the design and influence of specific advanced nanomaterials incorporated in polymer matrix toward membrane performance.

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Section: Hydrocarbon Polymermentioning

confidence: 99%

Fabrication, Properties, and Performance of Polymer Nanocomposite Ion Exchange Membranes for Fuel Cell Applications: A Review

Daud

Norddin

Jaafar

et al. 2022

AMST

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“…Proton conductors suitable for anhydrous conditions are crucial for medium-temperature PEMFC operation. Conventional polymer proton exchange membranes like Nafion cannot be used at temperatures exceeding 100 °C due to the requirement for humidification. , …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structure-Electrochemical Property Relationships of Hybrid Imidazole-Based Proton Conductors for Medium-Temperature Anhydrous Fuel Cells

Maegawa,

Wlazło,

Huy Phuc

et al. 2023

Chem. Mater.

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Medium-temperature anhydrous operation (above 120 °C) of polymer electrolyte membrane fuel cells (PEMFCs) has been extensively investigated, particularly for heavy-duty fuel cell applications. In this context, inorganic–organic composites based on acid–base reactions emerge as essential candidates for medium-temperature PEMFC applications. This study aims to develop a proton-conductive salt by simultaneously coordinating multiple acid species with heterocyclic imidazole (Imi), which possesses basic sites capable of reacting with acids. The goal is to create a highly proton-conductive composite suitable for anhydrous conditions. The mechanochemical milling method was employed to incorporate SiO2 as a second material into imidazole hydrochloride (ImiHCl). As a result, the addition of SiO2 to ImiHCl led to an enhancement in proton conductivity compared with imidazole (Im), imidazole hydrochloride (ImiHCl), and imidazole–SiO2 (Imi–SiO2). Furthermore, a method based on density functional theory (DFT) was proposed to predict the high/low proton conductivity, which exhibited good correlation with the experimentally obtained conductivity values. This DFT approach provided insights into the proton conduction mechanism. Through comprehensive physical characterizations (FT-IR, NMR, XRD, and TGA) and DFT calculations, it was revealed that the high proton conductivity observed in the corresponding xImiHCl-(100 – x)SiO2 composites (composition ratio of ImiHCl: x = 40–100) can be attributed to an increased number of proton species, accelerated proton dissociation facilitated by SiO2, and promotion of proton diffusion. Particularly, the xImiHCl-(100 – x)SiO2 (x = 60) electrolyte demonstrated the highest proton conductivity of 1.4 × 10–2 S cm–1. Subsequently, a PBI-based electrolyte membrane prepared using 60ImiHCl-40SiO2 significantly enhanced the fuel cell performance to 521 mW cm–2 under anhydrous conditions at 150 °C.

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“…[28,29]. However, more often, an empirical approach is used, where the modifying layer nature and thickness are determined by the trial-and-error method [32,33]. The deposition on the membrane surface of a thin layer with fixed ions charged opposite to the charge of the substrate membrane makes it possible to obtain asymmetric bipolar membranes.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Description of the Increase in Selectivity of an Anion-Exchange Membrane Due to Its Modification with a Perfluorosulfonated Ionomer

Kozmai

Pismenskaya

Nikonenko

2022

IJMS

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In this paper, we simulate the changes in the structure and transport properties of an anion-exchange membrane (CJMA-7, Hefei Chemjoy Polymer Materials Co. Ltd., China) caused by its modification with a perfluorosulfonated ionomer (PFSI). The modification was made in several stages and included keeping the membrane at a low temperature, applying a PFSI solution on its surface, and, subsequently, drying it at an elevated temperature. We applied the known microheterogeneous model with some new amendments to simulate each stage of the membrane modification. It has been shown that the PFSI film formed on the membrane-substrate does not affect significantly its properties due to the small thickness of the film (»4 µm) and similar properties of the film and substrate. The main effect is caused by the fact that PFSI material “clogs” the macropores of the CJMA-7 membrane, thereby, blocking the transport of coions through the membrane. In this case, the membrane microporous gel phase, which exhibits a high selectivity to counterions, remains the primary pathway for both counterions and coions. Due to the above modification of the CJMA-7 membrane, the coion (Na+) transport number in the membrane equilibrated with 1 M NaCl solution decreased from 0.11 to 0.03. Thus, the modified membrane became comparable in its transport characteristics with more expensive IEMs available on the market.

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Modifications on Promoting the Proton Conductivity of Polybenzimidazole-Based Polymer Electrolyte Membranes in Fuel Cells

Cited by 16 publications

References 130 publications

Fabrication, Properties, and Performance of Polymer Nanocomposite Ion Exchange Membranes for Fuel Cell Applications: A Review

Fabrication, Properties, and Performance of Polymer Nanocomposite Ion Exchange Membranes for Fuel Cell Applications: A Review

Synthesis and Structure-Electrochemical Property Relationships of Hybrid Imidazole-Based Proton Conductors for Medium-Temperature Anhydrous Fuel Cells

Mathematical Description of the Increase in Selectivity of an Anion-Exchange Membrane Due to Its Modification with a Perfluorosulfonated Ionomer

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