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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, PEMFC, metal-air batteries, Metal-CO2 system

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Monolithic heteronanomat paper air cathodes toward origami-foldable/rechargeable Zn-air batteries

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Title
Monolithic heteronanomat paper air cathodes toward origami-foldable/rechargeable Zn-air batteries
Author
Lee, DonggueLee, HansolGwon, OhhunKwon, OhhunJeong, Hu YoungKim, GuntaeLee, Sang-Young
Issue Date
2019-11
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.42, pp.24231 - 24238
Abstract
The ongoing surge in demand for flexible/wearable electronics spurs us to explore high-performance power sources with various form factors. Here we demonstrate monolithic heteronanomat (MH) paper air cathodes as a new electrode platform to enable the fabrication of origami-foldable zinc (Zn)-air batteries with reliable electrochemical rechargeability. The MH paper air cathodes consist of one-dimensional (1D) bifunctional catalyst mixtures (NdBa0.5Sr0.5Co1.5Fe0.5O5+delta double perovskite (NBSCF) nanofibers for the oxygen evolution reaction and nitrogen-doped carbon nanotubes (N-CNTs) for the oxygen reduction reaction), cellulose nanofibers (CNFs), and polytetrafluoroethylene (PTFE) nanoparticles, without the incorporation of conventional current collectors and gas diffusion layers. The CNFs and PTFE nanoparticles act as hydrophilic and hydrophobic binders, respectively, to construct three-dimensional (3D) bicontinuous electrolyte/air channels in the MH paper air cathodes. The well-developed electrolyte/air transport pathways, in combination with the rational design of the 1D bifunctional catalyst mixtures, enables the resultant Zn-air batteries (MH paper air cathode vertical bar CNF separator membrane vertical bar Zn-foil anode) to exhibit highly efficient charge/discharge performance and cyclability. In addition, the highly entangled network structure (based on a fibrous mixture of NBSCFs, N-CNTs, and CNFs) of the MH paper air cathode substantially improves its mechanical flexibility under various deformation modes, enabling the resultant Zn-air battery to be folded into a paper-airplane shape via origami folding.
URI
https://scholarworks.unist.ac.kr/handle/201301/30611
URL
https://pubs.rsc.org/en/content/articlelanding/2019/TA/C9TA07681F#!divAbstract
DOI
10.1039/c9ta07681f
ISSN
2050-7488
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UCRF_Journal Papers
ECHE_Journal Papers
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