Construction of reliable ion-conducting channels based on the perfluorinated anion-exchange membrane for high-performance pure-water-fed electrolysis

Zheng, Shuhong; Zhao, Shengqiu; Tan, Hongyun; Wang, Rui; Zhai, Miaoyan; Zhang, Haining; Qin, Hua‐Li; Tang, Haolin

doi:10.1007/s42114-023-00657-w

Cited by 17 publications

(6 citation statements)

References 54 publications

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“…The ionic conductivity, as a data reflecting the ion transport capacity of AEMs, visualizes the potential of the membranes to be used in fuel cell applications. ,, To start with, Figure a shows the OH – transport mechanism of AEMs for fuel cell applications. When AEMs start to work in the fuel cell, O 2 and H 2 O on the cathode undergo a reduction reaction to generate OH – , and OH – then moves through the AEMs and reaches the anode, where oxidation reaction occurs to generate electrons and H 2 O, and the generated electrons are returned to the cathode through the external circuit, thus achieving the effect of power supply.…”

Section: Resultsmentioning

confidence: 99%

“…A series of QPTPTMT- x AEMs were further prepared by introducing TMTE monomers into ether-bond-free polyaryl piperidine backbones via the ultrastrong acid-catalyzed reaction. What is more, the multiple forces of the strong hydrophobicity of the –CF 3 groups, − the electron withdrawal on the thiophene groups, − and the dual ion–dipole interactions generated by the cation on the fluorine and oxygen atoms synergistically drive the intramembrane thermodynamic self-assembly. , This facilitates the induction of cation cluster aggregation and the construction of continuous ion transport channels, which is expected to improve all aspects of the polymer membrane properties. Finally, a series of AEMs containing different levels of TMTE were systematically measured for macro- and micromorphology, thermal stability, mechanical properties, ionic conductivity, alkali resistance stability, and other properties to validate the rationality of the strategy.…”

Section: Introductionmentioning

confidence: 99%

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Fluorinated Poly(thiophene-based aryl piperidinium) Anion-Exchange Membranes Containing Dual Cation–Dipole Interactions for Alkaline Fuel Cells

Li,

Gao,

et al. 2024

ACS Sustainable Chem. Eng.

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At present, in order to expand and extend the application scope of anion-exchange membrane fuel cells (AEMFCs) in response to the global development of green energy, the design and development of anion exchange membranes (AEMs) that combine high electrochemical performance and long life is a matter of great urgency. In this paper, a series of QPTPTMT-x AEMs with different contents of 2,2,2-trifluoro-1-(5-methoxythiophen-2-yl)ethan-1-one (TMTE) were prepared by first synthesizing TMTE monomers and then introducing them into the polyaryl piperidine skeleton via an ultrastrong acid-catalyzed reaction. With the introduction of TMTE monomers, the F atom provides strong hydrophobicity, while the S heteroatom is present to facilitate intermolecular interactions. On the other hand, –CF3 and O atoms interact together with cations to produce dual cation–dipole interactions. The comprehensive performance of QPTPTMT-x AEMs produces great improvement. Particularly, QPTPTMT-20 AEM with the lowest ion-exchange capacity and swelling ratio achieved the best ionic conductivity of 180.1 mS cm–1 at 80 °C while possessing a tensile strength of 72 MPa. After immersion in 3 M NaOH for 1080 h, the conductivity retention of the AEMs was still 94.4%. Last, the membranes were prepared into membrane electrode assemblies for single-cell performance testing. The QPTPTMT-20 AEM demonstrated a peak power density of 416 mW cm–2 at 80 °C.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluorinated Poly(thiophene-based aryl piperidinium) Anion-Exchange Membranes Containing Dual Cation–Dipole Interactions for Alkaline Fuel Cells

Li,

Gao,

et al. 2024

ACS Sustainable Chem. Eng.

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“…MEA preparation: MEAs were produced with a conventional Decal transfer method [ 32 ]. Pt/C and Nafion 115 were used as the cathode catalyst and membrane.…”

Section: Methodsmentioning

confidence: 99%

“…Single-cell test: All the single-cell performances of the MEAs were investigated using an IPS PTC-05100E large current electrochemical workstation [ 32 ]. Deionized water was used as a reactant.…”

Section: Methodsmentioning

confidence: 99%

Structure–Performance Correlation Inspired Platinum-Assisted Anode with a Homogeneous Ionomer Layer for Proton Exchange Membrane Water Electrolysis

Cheng,

Tian,

Wang

et al. 2024

Polymers

Self Cite

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PEMWE is becoming one of the most promising technologies for efficient and green hydrogen production, while the anode OER process is deeply restricted by the now commercially used iridium oxide with sluggish reaction kinetics and super high cost. Deeply exploring the essential relationship between the underlying substrate materials and the performance of PEMWE cells while simultaneously excavating new practical and convenient methods to reduce costs and increase efficiency is full of challenges. Herein, two representative kinds of iridium oxide were studied, and their performance difference in PEMWE was precisely analyzed with electrochemical techniques and physical characterization and further linked to the ionomer/catalyst compound features. A novel anode with a uniform thin ionomer coating was successfully constructed, which simultaneously optimized the ionomer/catalyst aggregates as well as electrical conductivity, resulting in significantly enhanced PEMWE performance. This rigorous qualitative analysis of the structure–performance relationship as well as effective ionomer-affinitive optimization strategies are of great significance to the development of next-generation high-performance PEM water electrolyzers.

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“…high ion conductivity and physical stability in an alkaline environment [7][8][9][10]. Nevertheless, unreliable PfCPs with zero anion-exchange capacities and no AEMs were generated when exposed to alkaline conditions based on PfSO2F because of the cleavage of the weak sulfone-cation linkage [11,12].…”

Section: Introductionmentioning

confidence: 99%

Ion-Exchange Strategy Enabling Direct Reformation of Unreliable Perfluorinated Cationic Polymer for Robust Proton Exchange Membrane towards Hydrogen Fuel Cells

Xie,

Jia,

Liu

et al. 2024

Energies

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Perfluorosulfonated anionic ionomers are known for their robust ion conductivity and chemical and mechanical stability. However, the structure and transport property degradation of perfluorinated cationic polymers (PfCPs) are not well understood. Herein, we propose an ion-exchange strategy to identify the structural degradation, ion transport mechanisms, and architectural reformation of PfCPs. Particularly, we demonstrate that the utility of a –SO2–N+ strategy employing the Menshutkin reaction cannot yield reliable PfCPs and anion-exchange membranes, but can yield an unreliable zwitterionic intermediate (cations–anions molar ratio is approximately 7.6%). Moreover, the degradation products were efficiently reformed as proton exchange membranes (PEMs), and the as-reformed PEMs achieved an ion-exchange capacity (IEC) value (0.89 mmol g−1), meanwhile retaining more than 94.7% of their initial capacity. Furthermore, the fuel cell assembled with reformed PEMs displayed a power density of 0.91 Wcm−2 at 2.32 A cm−2, which was 90.1% of that of the robust perfluorosulfonic acid PEMs. Our combined findings shed some fresh light on the state of understanding of the structure–property relationship in PfCPs.

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Construction of reliable ion-conducting channels based on the perfluorinated anion-exchange membrane for high-performance pure-water-fed electrolysis

Cited by 17 publications

References 54 publications

Fluorinated Poly(thiophene-based aryl piperidinium) Anion-Exchange Membranes Containing Dual Cation–Dipole Interactions for Alkaline Fuel Cells

Fluorinated Poly(thiophene-based aryl piperidinium) Anion-Exchange Membranes Containing Dual Cation–Dipole Interactions for Alkaline Fuel Cells

Structure–Performance Correlation Inspired Platinum-Assisted Anode with a Homogeneous Ionomer Layer for Proton Exchange Membrane Water Electrolysis

Ion-Exchange Strategy Enabling Direct Reformation of Unreliable Perfluorinated Cationic Polymer for Robust Proton Exchange Membrane towards Hydrogen Fuel Cells

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