Electrospun Nafion/PVDF single-fiber blended membranes for regenerative H2/Br2 fuel cells

Park, Jun Woo; Wycisk, Ryszard; Lin, Guangyu; Chong, Pau Ying; Powers, Devon; Nguyen, Trung Van; Dowd, Regis Paul; Pintauro, Peter N.

doi:10.1016/j.memsci.2017.06.086

Cited by 48 publications

(25 citation statements)

References 23 publications

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“…[ 36–38 ] Meanwhile, Although no macrophase separation in well miscible blends is observed, microscopic phase separation of PVDF and PFSA in PVDF/PFSA blend would also took place at the nanometer scale. [ 26,39 ] TEM images of PVDF 5130/PFSA blend and pure PFSA membrane are shown in Figure S3a,b, Supporting Information. Before testing, the membranes were stained with a saturated lead acetate solution to obtain clear visualization of Nafion's ionic domains.…”

Section: Resultsmentioning

confidence: 99%

“…[ 23 ] Pintauro et al fabricated single‐fiber Nafion/PVDF (reinforcing polymer) membranes by electrostatic spinning for H 2 /Br 2 fuel cells. [ 26 ] The single‐fiber Nafion/PVDF (80 wt%/wt%) membrane (thickness of 18 μm) shows low Br 2 /Br 3 − crossover and outputted 1.31 W cm −2 power, 46% higher than that of Nafion 212. However, the nanofiber composite membrane has inferior mechanical property with addition of PVDF up to 40 wt%.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimizing the Molecular Weight of Poly(vinylidene Fluoride) for Competitive Perfluorosulfonic Acid Membranes

Dong

Zhong

Chen

et al. 2021

Physica Rapid Research Ltrs

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Homogeneous proton exchange membrane with high mechanical strength and low gas permeation is of paramount importance for the application of proton exchange membrane fuel cells (PEMFCs). Herein, the impact of different molecular weight of poly(vinylidene fluoride) (PVDF, Mw = 350 000–1 100 000 g mol−1) on the performance of the perfluorosulfonic acid (PFSA)/PVDF blend membrane is studied systematically for the first time. The mechanical strength of the PFSA/PVDF blend membrane increases and the H2 crossover of PFSA/PVDF blend membrane is decreased with increasing molecular weight of PVDF. Due to the fact that ultra‐high molecular weight PVDF has more long‐chain molecules which can enhance the adhesive strength between PVDF and PFSA, the tensile strength of 25 wt% PVDF5130–PFSA (Mw = 1 100 000) membrane reaches 33.5 MPa with the thickness of 15 μm, 200% higher than that of pure PFSA membrane and 60% higher than that of commercial Nafion 211. The H2 crossover of the blend membrane is 0.69 mA cm−2, much lower than that of commercial Nafion 211 (2.05 mA cm−2). When applied in PEMFCs, the blend membrane shows comparable power density to Nafion 211 with an output of 1.17 W cm−2.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing the Molecular Weight of Poly(vinylidene Fluoride) for Competitive Perfluorosulfonic Acid Membranes

Dong

Zhong

Chen

et al. 2021

Physica Rapid Research Ltrs

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“…Recently, also composite PFSA membranes have been developed [33][34][35]. Promising in this respect are composite membranes prepared via electrospinning using blends of PFSA and e.g., PVDF.…”

Section: Membranementioning

confidence: 99%

“…Another challenge is to develop a more selective ion-exchange membrane to reject bromine species that are highly corrosive towards the electrocatalyst. On this matter, some efforts to fine-tune the ionic channels are also being pursued [31,34,35]. It is expected that with such approaches, the electrocatalyst loading can be as low as in proton exchange membrane (PEM) fuel cell applications (i.e., 0.05 mg Pt/cm 2 ).…”

Section: Hbfb Stack Component Costsmentioning

confidence: 99%

Techno-Economic Analysis of a Kilo-Watt Scale Hydrogen-Bromine Flow Battery System for Sustainable Energy Storage

Hugo

Kout²,

Dalessi³

et al. 2020

Processes

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Transitioning to a renewable energy economy requires the widespread integration of solar and wind power, which are intermittent, into the electricity grid. To this goal, it is paramount to develop cost-competitive, reliable, location-independence, and large-scale energy storage technologies. The hydrogen bromine flow battery (HBFB) is a promising technology given the abundant material availability and its high power density. Here, the aim is to perform a comprehensive techno-economic analysis of a 500 kW nominal power/5 MWh HBFB storage system, based on the levelized cost of storage approach. Then, we systematically analyze stack and system components costs for both the current base and a future scenario (2030). We find that, for the base case, HBFB capital investments are competitive to Li-ion battery technology, highlighting the potential of large-scale HBFB market introduction. Improving the stack performance and reducing the stack and system costs are expected to result in ~62% reduction potential in capital investments. The base-case levelized cost of storage, $0.074/kWh, is sufficiently low for a wind-solar storage system to compete with a fossil-based power plant, with potential for reduction to $0.034/kWh in the future scenario. Sensitivity analysis indicates that the levelized cost of storage is most sensitive towards the stack lifetime, which motivates research efforts into advanced electrocatalysts with higher durability and ion-exchange membranes with improved selectivity.

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“…[ 43–45 ] The latest research shows that the spatial organization of ionic clusters and hydrophobic skeleton of nanophase can be formed in the NF electrospun nanofibers, which provides natural nanophysical geometric adjustment for proton transport nanochannels. [ 22,32,46–49 ] Moreover, an order of magnitude increase in humidity sensitivity on the NF nanofibers compared with the bulk NF film, causes protons to combine rapidly with H 2 O molecule and transport along the nanofiber axial direction at relatively low humidity. [ 50–52 ] These unique structural characteristics provide the possibility to design long‐range interconnected continuous ionic nanochannels and the optimal spatial adjustment for the modulation of the ordered arrangement of sulfonic acid group clusters of the NF.…”

Section: Introductionmentioning

confidence: 99%

Surface Enriched Sulfonic Acid Ionic Clusters of Nafion Nanofibers as Long‐Range Interconnected Ionic Nanochannels for Anisotropic Proton Transportation: Phenomenon and Molecular Mechanism

Jin

Yan

Zhao

et al. 2020

Adv Materials Inter

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Construction of long‐range interconnected ionic channels in proton exchange membranes (PEMs) is the key to realize anisotropic proton transportation. But, how to effectively modulate ionic channels at the molecular level still remains a great challenge for modern nanoenergy technology. Here, surface enriched sulfonic acid ionic clusters in Nafion (NF)/ZnO nanofibers are successfully designed and fabricated as long‐range interconnected ionic channels, in which the ZnO nanofiller (nano‐ZnO) act as an inducer to enable the spatial deformation and inversion of sulfonic acid groups in NF molecule from the inside to the surface of the NF/ZnO nanofibers, due to the strong intermolecular electrostatic interactions between nano‐ZnO and the CF2 of NF backbones. The phenomenon and molecular mechanism are visually confirmed by physicochemical analysis. Ultimately, the NF/ZnO nanofibers demonstrate the relative higher of proton conductivity up to 253.2 mS cm‐1 and power density of 115.72 mW cm‐2 than that of reported NF‐based PEMs. This study, for the first time, reveals that the surface enrichment of sulfonic acid ionic clusters is an efficient strategy to construct long‐range interconnected ionic channels in the NF‐based PEMs, proves that the formation of the ionic channels could be efficiently modulated by controlling the molecular activity and morphology of nanofiller.

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Electrospun Nafion/PVDF single-fiber blended membranes for regenerative H2/Br2 fuel cells

Cited by 48 publications

References 23 publications

Optimizing the Molecular Weight of Poly(vinylidene Fluoride) for Competitive Perfluorosulfonic Acid Membranes

Optimizing the Molecular Weight of Poly(vinylidene Fluoride) for Competitive Perfluorosulfonic Acid Membranes

Techno-Economic Analysis of a Kilo-Watt Scale Hydrogen-Bromine Flow Battery System for Sustainable Energy Storage

Surface Enriched Sulfonic Acid Ionic Clusters of Nafion Nanofibers as Long‐Range Interconnected Ionic Nanochannels for Anisotropic Proton Transportation: Phenomenon and Molecular Mechanism

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