Sub-5 nm Graphene Oxide Nanofilm with Exceptionally High H+/V Selectivity for Vanadium Redox Flow Battery
- Authors
- Park, Seul Chan; Lee, Tae Hoon; Moon, Gi Hyeon; Kim, Byung Su; Roh, Jong Min; Cho, Young Hoon; Kim, Hyo Won; Jang, Jaeyoung; Park, Ho Bum; Kang, Yong Soo
- Issue Date
- Jul-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Graphene oxide membrane; molecular-sieving nanochannel; kinetic desorption method; thin film composite membrane; vanadium redox flow battery
- Citation
- ACS APPLIED ENERGY MATERIALS, v.2, no.7, pp.4590 - 4596
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED ENERGY MATERIALS
- Volume
- 2
- Number
- 7
- Start Page
- 4590
- End Page
- 4596
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2889
- DOI
- 10.1021/acsaem.9b00474
- ISSN
- 2574-0962
- Abstract
- Highly H+/V selective membranes are desired in high-performance vanadium redox flow batteries (VFRBs) to overcome the crossover phenomena of vanadium species. Herein, we demonstrate the molecular-sieving nanochannels (similar to 0.84 nm) inside a graphene oxide (GO) laminate efficiently blocked the transport of vanadium ions, while allowing the transport of Fit Furthermore, an ultrathin (sub-5 nm) and highly selective GO nanofilm was successfully coated on a porous substrate to improve the H+ flux using a facile spin-coating method. The GO-coated thin-film composite (TFC) membrane showed much higher H+ flux with an exceptionally high H+/V selectivity (H+ permeation rate/VO2+ permeation rate, up to 850) due to the molecular-sieving nanochannels inside the GO nanofilm, leading to a much more enhanced VRFB performance in terms of energy efficiency (EE, 84.7%) compared to the benchmark Nafion membrane (EE, 69.2%), at 20 mA cm(-2).
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