SPEEK Membrane of Ultrahigh Stability Enhanced by Functionalized Carbon Nanotubes for Vanadium Redox Flow Battery

Frontiers in Chemistry
Mei DingChuankun Jia

Abstract

Proton exchange membrane is the key factor of vanadium redox flow battery (VRB) as their stability largely determine the lifetime of the VRB. In this study, a SPEEK/MWCNTs-OH composite membrane with ultrahigh stability is constructed by blending sulfonated poly(ether ether ketone) (SPEEK) with multi-walled carbon nanotubes toward VRB application. The carbon nanotubes disperse homogeneously in the SPEEK matrix with the assistance of hydroxyl group. The blended membrane exhibits 94.2 and 73.0% capacity retention after 100 and 500 cycles, respectively in a VRB single cell with coulombic efficiency of over 99.4% at 60 mA cm-2 indicating outstanding capability of reducing the permeability of vanadium ions and enhancing the transport of protons. The ultrahigh stability and low cost of the composite membrane make it a competent candidate for the next generation larger-scale vanadium redox flow battery.

References

Aug 11, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Abed M AffouneMinoru Umeda
Mar 8, 2011·Chemical Reviews·Zhenguo YangJun Liu
Mar 7, 2014·Nature·Richard Van Noorden
Apr 5, 2016·Nature Nanotechnology·Ramya H TunuguntlaAleksandr Noy
Sep 1, 2016·ACS Applied Materials & Interfaces·Lihong Yu, Jingyu Xi

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Citations

Feb 2, 2021·Frontiers in Chemistry·Shangzhuo WuZhangxing He

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Methods Mentioned

BETA
scanning electron microscopy
AFM

Software Mentioned

ZEISS

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