Desalination, Год журнала: 2024, Номер unknown, С. 118414 - 118414
Опубликована: Дек. 1, 2024
Язык: Английский
Advanced Energy Materials, Год журнала: 2025, Номер unknown
Опубликована: Фев. 14, 2025
Abstract Non‐fluorinated polymer membranes offer a commercially feasible solution for redox flow batteries (RFBs), yet their practical applications have been hampered by inherent challenges such as chemical instability and low ionic conductivity. In this study, the development of series ether‐bond‐free poly(aryl piperidine) that address these limitations introducing enhanced disorder in chain packing through supramolecular interactions with organic acids, is presented. These effectively disrupt densely packed chains, transforming proton‐inaccessible crystalline regions into accessible amorphous ones. By eliminating chemically unstable aryl ether bonds avoiding additional modifications, exhibit remarkable long‐term stability. The presence abundant interchain gaps further facilitates rapid proton‐selective transport. As result, engineered demonstrate sustained performance vanadium RFBs, maintaining stable operation over 1000 charge/discharge cycles, achieving an impressive energy efficiency 80% at high current density 280 mA cm − 2 . combination experimental data theoretical modeling suggests membrane's outstanding arises from interconnected widely distributed gaps, which pore‐limiting diameter ≈8 Å. findings robust design strategy developing stable, high‐performance non‐fluorinated RFBs related conversion devices.
Язык: Английский
Процитировано
0
ACS Applied Polymer Materials, Год журнала: 2025, Номер unknown
Опубликована: Март 5, 2025
Язык: Английский
Процитировано
0
Macromolecular Rapid Communications, Год журнала: 2025, Номер unknown
Опубликована: Март 29, 2025
Abstract The high conductivity of anion exchange membrane (AEM) remains a great challenge in achieving high‐performance vanadium flow batteries. In this work, is achieved by designing series microporous crosslinked quaternary ammonium membranes (QDTTB‐Xs), which synthesized situ reacting iodomethane with novel Tröger base (DTTB‐Xs) that prepared condensation 2, 6 (7)‐diamino‐triptycene and (7)‐13‐triamino‐triptycene through crosslinking. Compared linear QDTTB‐0, the QDTTB‐X showed higher conductivity. QDTTB‐35 displays both coulombic efficiency voltage efficiency, 80% energy realized at 200 mA cm −2 . Outperforming N117 other reported membranes. This due to increased triamino‐triptycene molar ratio resulting N + concentration improved micropores concentration. Moreover, positively charged groups combined low swelling also help restricting ions permeation. These results give perspectives AEMs for VRFB applications.
Язык: Английский
Процитировано
0
Journal of Membrane Science, Год журнала: 2025, Номер unknown, С. 124139 - 124139
Опубликована: Апрель 1, 2025
Язык: Английский
Процитировано
0
Advanced Energy Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 30, 2025
Abstract Poly(4,4′‐diphenylether‐5,5′‐bibenzimidazole), OPBI, is sulfonated at different conditions to reach degrees of sulfonation (DOS 35, 54, 102, and 133%). The membrane with a DOS 102% shows the most balanced properties. tensile strength 55 MPa elongation break 130%. Conductivity in 3 m sulfuric acid exceeds that Nafion 212 (58 mS cm −1 ) reaches 70 . resistance 23 µm thick 33 mΩ 2 , energy efficiencies 91.8% 80 mA −2 90.4% 100 are achieved. OPBI showed highest stability contact VO + because ions cannot enter membrane. Sulfonated swells more acid, therefore has lower stability. However, it found increases DOS. This indicates attack by occurs preferentially positions activated for electrophilic aromatic substitution reactions.
Язык: Английский
Процитировано
0
ACS Applied Energy Materials, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 15, 2024
Redox flow batteries (RFBs) are one of the hopes for grid energy storage applications. Among various RFBs, vanadium redox battery (VRFB) has specific advantage deploying same element, i.e., in different oxidation states both negolyte and posolyte. However, its major unmet concern is poor charge retention during cycling, attributed to cross-contamination across separator. Perfluorosulfonic acid-based cation exchange membranes (CEMs) preferred separators VRFB. Nevertheless, negatively charged matrix CEMs, redox-active species counterions easily diffuse through, leading capacity decay. To counter crossover, benefit Donnan exclusion been considered. For this reason, anion (AEMs) encouraged The positive on AEMs can effectively exclude ions, but have limitation low ionic conductivity questionable chemical stability a highly oxidative environment. In recent years, membrane research community adopted strategies ions between electrodes boost overall performance battery. review, we will focus approaches developed advancement VRFB membranes.
Язык: Английский
Процитировано
2
Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 158925 - 158925
Опубликована: Дек. 1, 2024
Язык: Английский
Процитировано
2
Journal of Membrane Science, Год журнала: 2024, Номер unknown, С. 123651 - 123651
Опубликована: Дек. 1, 2024
Язык: Английский
Процитировано
2
Journal of Membrane Science, Год журнала: 2024, Номер unknown, С. 123618 - 123618
Опубликована: Дек. 1, 2024
Язык: Английский
Процитировано
1
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Дек. 29, 2024
Abstract As the demand for scalable electrochemical energy storage increases, vanadium redox flow batteries (VRFBs) offer multiple advantages due to their inherent safety, environmental friendliness, and power‐to‐capacity decoupling capability. However, intrinsic structural limitations of electrodes, coupled with deficiencies in surface properties, significantly impede practical implementation VRFBs. The systematic optimization electrodes through precursor engineering represents a forward‐thinking approach significant potential advancing field. In this paper, recent advances VRFB are comprehensively reviewed from perspective engineering. To begin with, based on different types precursors processing methods elucidated. Next, focus is additive modification design various strategies optimize properties. Lastly, review also discusses current dilemmas faced by four explores future directions. It hoped that will contribute further innovation production application electrode materials.
Язык: Английский
Процитировано
1