Sulfonated graphene oxide-decorated block copolymer as a proton-exchange membrane: improving the ion selectivity for all-vanadium redox flow batteries

Aziz, Md. Abdul; Shanmugam, Sangaraju

doi:10.1039/c8ta06717a

Cited by 69 publications

(30 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The vanadium‐deficient side limits the capacity, which can be regenerated either with periodic remixing of the negative and positive electrolyte once the capacity reaches a critical level or continuous reflow . Increasing the membrane's barrier properties towards vanadium ions only slows down this effect . The cost of remixing for a 6 MWh battery that loses 1.8 % of its discharge capacity per cycle at 60 % discharge capacity is estimated to be >8 $ MWh −1 , which translates to 350 000 $ over the expected lifetime of 20 years (see the Supporting Information for details).…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7] Increasing the membrane's barrierp roperties towards vanadium ions only slows down this effect. [8][9][10][11] The cost of remixing for a6MWh battery that loses 1.8 %o fi ts discharge capacity per cycle at 60 %d is-charge capacity is estimated to be > 8$MWh À1 ,w hich translates to 350 000 $o ver the expected lifetimeo f2 0years (see the SupportingI nformation for details). Furthermore, continuous reflow translatesi nto ac ontinuous discharge, causing an efficiency loss of up to 10 %a tl ow current densities.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tackling Capacity Fading in Vanadium Redox Flow Batteries with Amphoteric Polybenzimidazole/Nafion Bilayer Membranes

et al. 2019

View full text Add to dashboard Cite

Vanadium flow batteries are among the most promising technologies for stationary energy storage applications if their cost of storage can be further decreased. Capacity fading resulting from imbalanced vanadium crossover is a key operating cost component. Herein, a new approach is reported to avoid this cost by balancing electrolyte transport with amphoteric bilayer Nafion/meta‐polybenzimidazole membranes. Within this system, the anion‐ and cation‐exchange capacity can be tuned in a straightforward manner by changing the thickness of the respective polymer layer to balance electrolyte transport for a given current density. At high current densities, a net migrative flux of vanadium directed towards the positive side is observed owing to the higher average charge of vanadium ions present at the negative side. The coulombic repulsion between the vanadium ions and the positive charges in the membrane counteracts this migrative transport and can reverse the direction of the net vanadium flux. For a technically relevant current density of 120 mA cm−2, a PBI thickness of 3–4 μm is required to balance the vanadium crossover and to minimize capacity fading.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tackling Capacity Fading in Vanadium Redox Flow Batteries with Amphoteric Polybenzimidazole/Nafion Bilayer Membranes

et al. 2019

View full text Add to dashboard Cite

show abstract

“…This is possibly due to the uniform dispersion of hydrophilic SGO in the S-Chitosan surface as well as their hydrogen bonding. 33,34 As depicted in Table 1, it is obviously seen that the nanocomposite membranes showed a lower contact angle due to the increase in surface hydrophilicity. The addition of SGO increases hydrophilicity possibly due to the increase in sulfonic acid content and thus facilitates a higher affinity with water molecules.…”

Section: Afm and Contact Anglementioning

confidence: 98%

Highly selective custom‐made chitosan based membranes with reduced fuel permeability for direct methanol fuel cells

Divya

Rana

Rameesha

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

Custom-made nanocomposite proton exchange membranes (PEMs) are fabricated using the blends of sulfonated chitosan (S-Chitosan) and sulfonated graphene oxide (SGO) nanosheets for direct methanol fuel cells (DMFCs). Sulfonation of chitosan and GO are carried out by 1,3-propane sultone and sulfanilic acid, respectively. Scanning electron microscope (SEM) with energy dispersive X-ray investigation revealed that the thick, folded and wrinkled sheet-like morphology of SGO and the existence of elemental sulfur. SEM and atomic force microscopy images showed the uniform dispersion of hydrophilic SGO nanosheets. Besides the S-Chitosan/SGO membranes showed higher water uptake, swelling ratio and ion exchange capacity due to the enhancement in hydrophilicity. The modified PEMs displayed improvement in proton conductivity since the ion-exchangeable sulfonic acid groups facilitate the proton conduction and effectively resist the methanol permeability by forming a strong hydrogen bond network with chitosan and thus diminish the void volume. Particularly, S-Chiotsan-1 membrane showed superior proton conductivity of 4.86 Â 10 À3 Scm À1 at (25 C), selectivity of 1.89 Â 10 5 Scm À3 s and lesser methanol permeability of 2.57 Â 10 À8 cm 2 s À1 . Overall results suggest that the S-Chitosan/ SGO membranes found to be a suitable alternate for Nafion ® in DMFCs.

show abstract

“…Usually, organic solvents are inevitable in membrane synthesis. Common organic solvents used for synthesis include acetone [25], methanol [26], dimethylformamide (DMF) [27], dimethylacetamide (DMAc) [28], toluene [29], Nmethyl-2-pyrrolidone (NMP) [30], dimethyl sulfoxide (DMSO) [31], and tetrahydrofuran (THF) [32]. Among these solvents, many are toxic to human health and hazardous to the environment.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of polymeric membranes: Recent advances and future prospects

Jiang

Ladewig

2020

Current Opinion in Green and Sustainable Chemistry

View full text Add to dashboard Cite

Polymeric membranes are widely used in gas separations, liquid separations, and other processes such as fuel cells. However, methods and processes for manufacturing these membranes are usually harmful to the environment and/or human health. Although many new materials and synthesis methods are reported every year, green synthesis only makes up a small proportion. Therefore, more efforts are necessary to raise researchers' awareness to green synthesis of membranes. One popular strategy to greenly synthesize membranes is to avoid toxic organic solvents or use water to replace organic solvents completely. However, many reported green methods could only realize green synthesis partly. The ultimate goal is to synthesize membranes in a completely eco-friendly way, where raw materials, membrane preparation, post-treatment, and other involved procedures are all "green".

show abstract

Sulfonated graphene oxide-decorated block copolymer as a proton-exchange membrane: improving the ion selectivity for all-vanadium redox flow batteries

Abstract: A SPEKS/sGO composite membrane with superior ion selectivity and chemical stability was synthesized. The composite and pristine SPEKS membranes exhibited a 10.4- and 6.5-times greater self-discharge time compared with the commercial Nafion-212 membrane.

Cited by 69 publications

References 55 publications

Tackling Capacity Fading in Vanadium Redox Flow Batteries with Amphoteric Polybenzimidazole/Nafion Bilayer Membranes

Tackling Capacity Fading in Vanadium Redox Flow Batteries with Amphoteric Polybenzimidazole/Nafion Bilayer Membranes

Highly selective custom‐made chitosan based membranes with reduced fuel permeability for direct methanol fuel cells

Green synthesis of polymeric membranes: Recent advances and future prospects

Contact Info

Product

Resources

About