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Sulfonated NbS2-based proton-exchange membranes for vanadium redox flow batteries
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- Beydaghi, Hossein (författare)
- Ist Italiano Tecnol, Graphene Labs, Via Morego 30, I-16163 Genoa, Italy.;BeDimens SpA, Via Lungotorrente Secca 30R, I-16163 Genoa, Italy.
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- Bellani, Sebastiano (författare)
- BeDimens SpA, Via Lungotorrente Secca 30R, I-16163 Genoa, Italy.
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- Najafi, Leyla (författare)
- BeDimens SpA, Via Lungotorrente Secca 30R, I-16163 Genoa, Italy.
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- Ist Italiano Tecnol, Graphene Labs, Via Morego 30, I-16163 Genoa, Italy;BeDimens SpA, Via Lungotorrente Secca 30R, I-16163 Genoa, Italy. BeDimens SpA, Via Lungotorrente Secca 30R, I-16163 Genoa, Italy. (creator_code:org_t)
- 2022
- 2022
- Engelska.
- Ingår i: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3364 .- 2040-3372. ; 14:16, s. 6152-6161
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
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- In this work, novel proton-exchange membranes (PEMs) based on sulfonated poly(ether ether ketone) (SPEEK) and two-dimensional (2D) sulfonated niobium disulphide (S-NbS2) nanoflakes are synthesized by a solution-casting method and used in vanadium redox flow batteries (VRFBs). The NbS2 nanoflakes are produced by liquid-phase exfoliation of their bulk counterpart and chemically functionalized with terminal sulfonate groups to improve dimensional and chemical stabilities, proton conductivity (sigma) and fuel barrier properties of the as-produced membranes. The addition of S-NbS2 nanoflakes to SPEEK decreases the vanadium ion permeability from 5.42 x 10(-7) to 2.34 x 10(-7) cm(2) min(-1). Meanwhile, it increases the membrane sigma and selectivity up to 94.35 mS cm(-2) and 40.32 x 10(4) S min cm(-3), respectively. The cell assembled with the optimized membrane incorporating 2.5 wt% of S-NbS2 nanoflakes (SPEEK:2.5% S-NbS2) exhibits high efficiency metrics, i.e., coulombic efficiency between 98.7 and 99.0%, voltage efficiency between 90.2 and 73.2% and energy efficiency between 89.3 and 72.8% within the current density range of 100-300 mA cm(-2), delivering a maximum power density of 0.83 W cm(-2) at a current density of 870 mA cm(-2). The SPEEK:2.5% S-NbS2 membrane-based VRFBs show a stable behavior over 200 cycles at 200 mA cm(-2). This study opens up an effective avenue for the production of advanced SPEEK-based membranes for VRFBs.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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