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Inducing microstructural changes in Nafion by incorporating graphitic carbon nitride to enhance the vanadium-blocking effect

Abstract

Two-dimensional graphitic carbon nitride (g-C3N4) nanosheets are introduced into Nafion matrix to prepare a ‘vanadium-blocking’ recast Nafion membrane for vanadium redox flow batteries (VRFBs) application. After 0.2 wt. % g-C3N4 nanosheets are incorporated, the vanadium ion permeability of composite membrane decrease from 3.310-7 cm2/min to 3.810-9 cm2/min, which is a reduction of two orders of magnitude in comparison to the pristine recast Nafion membrane. This satisfactory result contributes to the physical blocking effect as well as the Donnan effect from the 2D morphology and functional amino groups of g-C3N4 nanosheets. Notably, this work reveals that the g-C3N4 nanosheets can help reinforce the vanadium-blocking effect by changing the microstructure of Nafion in addition to the well-known effects mentioned above. The g-C3N4 nanosheets induce shrinkage on the original spherical structure of ion cluster and generate a new lamellar structure. Correspondingly, the amorphous phase of Nafion is interrupted, and the membrane crystallinity is reduced. VRFB with optimized composite membrane achieves a high coulombic efficiency of 97% and an energy efficiency of 83% at current density of 160 mA/cm2. Meanwhile, the battery exhibited excellent lifetime stability during a 100 charge-discharge cycling test.

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Publication details

The article was received on 16 Nov 2017, accepted on 09 Feb 2018 and first published on 09 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP07744K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Inducing microstructural changes in Nafion by incorporating graphitic carbon nitride to enhance the vanadium-blocking effect

    C. Wu, S. Lu, J. Zhang and Y. Xiang, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP07744K

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