Morphological transformation of perfluorinated sulfonic acid ionomer via ionic complex formation at a high entropy state

Hwang, Jin Pyo; Park, In Kee; Park, Chi Hoon; Lee, Young Moo

doi:10.1016/j.mtener.2023.101250

Cited by 1 publication

(1 citation statement)

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“…However, the lower proton conductivity of the membranes at lower temperatures is constrained by the water in PA at low ADLs. 51 PA exhibits robust inherent proton conductivity at high temperatures, 52 resulting in a significant enhancement in the proton conductivity of the 1.5% CNT-FPBI membrane, measured at 0.0817 S cm −1 at 160 °C. Conversely, with an MWNT content of 2% or higher, proton conductivity gradually decreases.…”

Section: Proton Conductivitymentioning

confidence: 99%

Enhancing Performance and Stability of High-Temperature Proton Exchange Membranes through Multiwalled Carbon Nanotube Incorporation into Self-Cross-Linked Fluorenone-Containing Polybenzimidazole

Huang,

Wei,

et al. 2024

ACS Appl. Mater. Interfaces

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Addressing critical challenges in enhancing the oxidative stability and proton conductivity of high-temperature proton exchange membranes (HT-PEMs) is pivotal for their commercial viability. This study uncovers the significant capacity of multiwalled carbon nanotubes (MWNTs) to absorb a substantial amount of phosphoric acid (PA). The investigation focuses on incorporating long-range ordered hollow MWNTs into self-cross-linked fluorenone-containing polybenzimidazole (FPBI) membranes. The absorbed PA within MWNTs and FPBI forms dense PA networks within the membrane, effectively enhancing the proton conductivity. Moreover, the exceptional inertness of MWNTs plays a vital role in reinforcing the oxidation resistance of the composite membranes. The proton conductivity of the 1.5% CNT-FPBI membrane is measured at 0.0817 S cm–1 at 160 °C. Under anhydrous conditions at the same temperature, the power density of the 1.5% CNT-FPBI membrane reaches 831.3 mW cm–2. Notably, the power density remains stable even after 200 h of oxidation testing and 250 h of operational stability in a single cell. The achieved power density and long-term stability of the 1.5% CNT-FPBI membrane surpass the recently reported results. This study introduces a straightforward approach for the systematic design of high-performance and robust composite HT-PEMs for fuel cells.

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Section: Proton Conductivitymentioning

confidence: 99%