Improvement of proton conductivity and efficiency of SPEEK-based composite membrane influenced by dual-sulfonated flexible comb-like polymers for vanadium flow battery
Journal of Membrane Science, ISSN: 0376-7388, Vol: 671, Page: 121394
2023
- 27Citations
- 10Captures
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Article Description
A sulfonated poly(ether ether ketone)-based composite membrane (S/SMA-SN) is developed by introducing dual-sulfonated flexible comb-like polymer (SMA-SN), varying from 0.1 to 1.5 wt%, which was prepared from the poly(styrene-co-maleic anhydride)-ethylenediamine through a main-/side-chain two-step sulfonation procedure. The S/SMA-SN composite membranes demonstrate ultrahigh proton conductivity and excellent cell performance at ultralow contents of SMA-SN polymers. Synergistic main-/side-chain proton channels formed by SPEEK and SMA-SN offer the highest proton conductivity (49.2 mS cm -1 ) and the lowest vanadium ion permeability (19.6 × 10 -7 cm 2 min -1 ) for S/SMA-SN-0.5, which is superior to SPEEK and Nafion membranes. Moreover, S/SMA-SN-0.5 displays its remarkable energy efficiency (72–81.3%) at 100–200 mA cm -2 current density, further illustrating the tradeoff effect of conductivity and resistance. Even at 150 mA cm -2 current density, stable coulombic efficiency (97%) and energy efficiency (80%) maintained after 500 charge-discharge cycles confirms the stable membrane structure and increased chemical stability, which originated from the main-/side-chain synergistic structure. This opens a promising method to explore the high-performance proton exchange membrane for vanadium flow battery application by the side-chain structuralized comb-like polymer at ultralow concentrations.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0376738823000509; http://dx.doi.org/10.1016/j.memsci.2023.121394; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85146700210&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0376738823000509; https://dx.doi.org/10.1016/j.memsci.2023.121394
Elsevier BV
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