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Sub-5 nm Graphene Oxide Nanofilm with Exceptionally High H+/V Selectivity for Vanadium Redox Flow Battery

Title
Sub-5 nm Graphene Oxide Nanofilm with Exceptionally High H+/V Selectivity for Vanadium Redox Flow Battery
Author
장재영
Keywords
Graphene oxide membrane; molecular-sieving nanochannel; kinetic desorption method; thin film composite membrane; vanadium redox flow battery
Issue Date
2019-07
Publisher
AMER CHEMICAL SOC
Citation
ACS Applied Energy Materials, v. 2, no. 7, Page. 4590-4596
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).
URI
https://pubs.acs.org/doi/10.1021/acsaem.9b00474https://repository.hanyang.ac.kr/handle/20.500.11754/152112
ISSN
2574-0962
DOI
10.1021/acsaem.9b00474
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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