Pore-Size-Tuned Graphene Oxide Frameworks as Ion-Selective and Protective Layers on Hydrocarbon Membranes for Vanadium Redox-Flow Batteries

Soohyun Kim, Junghoon Choi, Chanyong Choi, Jiyun Heo, Daewoo Kim, Jang Yong Lee, Young Taik Hong, Hee Tae Jung, Hee Tak Kim

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The laminated structure of graphene oxide (GO) membranes provides exceptional ion-separation properties due to the regular interlayer spacing (d) between laminate layers. However, a larger effective pore size of the laminate immersed in water (∼11.1 Å) than the hydrated diameter of vanadium ions (>6.0 Å) prevents its use in vanadium redox-flow batteries (VRFB). In this work, we report an ion-selective graphene oxide framework (GOF) with a d tuned by cross-linking the GO nanosheets. Its effective pore size (∼5.9 Å) excludes vanadium ions by size but allows proton conduction. The GOF membrane is employed as a protective layer to address the poor chemical stability of sulfonated poly(arylene ether sulfone) (SPAES) membranes against VO 2 + in VRFB. By effectively blocking vanadium ions, the GOF/SPAES membrane exhibits vanadium-ion permeability 4.2 times lower and a durability 5 times longer than that of the pristine SPAES membrane. Moreover, the VRFB with the GOF/SPAES membrane achieves an energy efficiency of 89% at 80 mA cm -2 and a capacity retention of 88% even after 400 cycles, far exceeding results for Nafion 115 and demonstrating its practical applicability for VRFB.

Original languageEnglish
Pages (from-to)3962-3968
Number of pages7
JournalNano letters
Volume18
Issue number6
DOIs
Publication statusPublished - 2018 Jun 13

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Vanadium
Graphite
Hydrocarbons
Oxides
Graphene
vanadium
Pore size
electric batteries
graphene
hydrocarbons
Ions
membranes
Membranes
porosity
Sulfones
sulfones
oxides
Ether
Ethers
ethers

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Kim, Soohyun ; Choi, Junghoon ; Choi, Chanyong ; Heo, Jiyun ; Kim, Daewoo ; Lee, Jang Yong ; Hong, Young Taik ; Jung, Hee Tae ; Kim, Hee Tak. / Pore-Size-Tuned Graphene Oxide Frameworks as Ion-Selective and Protective Layers on Hydrocarbon Membranes for Vanadium Redox-Flow Batteries. In: Nano letters. 2018 ; Vol. 18, No. 6. pp. 3962-3968.
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abstract = "The laminated structure of graphene oxide (GO) membranes provides exceptional ion-separation properties due to the regular interlayer spacing (d) between laminate layers. However, a larger effective pore size of the laminate immersed in water (∼11.1 {\AA}) than the hydrated diameter of vanadium ions (>6.0 {\AA}) prevents its use in vanadium redox-flow batteries (VRFB). In this work, we report an ion-selective graphene oxide framework (GOF) with a d tuned by cross-linking the GO nanosheets. Its effective pore size (∼5.9 {\AA}) excludes vanadium ions by size but allows proton conduction. The GOF membrane is employed as a protective layer to address the poor chemical stability of sulfonated poly(arylene ether sulfone) (SPAES) membranes against VO 2 + in VRFB. By effectively blocking vanadium ions, the GOF/SPAES membrane exhibits vanadium-ion permeability 4.2 times lower and a durability 5 times longer than that of the pristine SPAES membrane. Moreover, the VRFB with the GOF/SPAES membrane achieves an energy efficiency of 89{\%} at 80 mA cm -2 and a capacity retention of 88{\%} even after 400 cycles, far exceeding results for Nafion 115 and demonstrating its practical applicability for VRFB.",
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Pore-Size-Tuned Graphene Oxide Frameworks as Ion-Selective and Protective Layers on Hydrocarbon Membranes for Vanadium Redox-Flow Batteries. / Kim, Soohyun; Choi, Junghoon; Choi, Chanyong; Heo, Jiyun; Kim, Daewoo; Lee, Jang Yong; Hong, Young Taik; Jung, Hee Tae; Kim, Hee Tak.

In: Nano letters, Vol. 18, No. 6, 13.06.2018, p. 3962-3968.

Research output: Contribution to journalArticle

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AU - Kim, Hee Tak

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