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Conformal Cu Coating on Electrospun Nanofibers for 3D Electro‐Conductive Networks
Author(s) -
Jiang Fuze,
Ju Wenbo,
Pan Zhengyuan,
Lin Luchan,
Yue Yang,
Zhao YiBo,
Li Congju,
Clemens Frank,
Battaglia Corsin,
Wang Jing
Publication year - 2020
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201900767
Subject(s) - materials science , nanofiber , conformal coating , coating , electrospinning , membrane , composite material , carbon nanofiber , conductivity , polymer , electrical conductor , nanotechnology , carbon nanotube , chemistry , biology , genetics
Electro‐conductive nanofiber networks have potential applications as gas diffusion electrodes (GDEs) operating at solid–liquid–gas three‐phase interfaces. Flexible GDEs are developed, based on a versatile method of conformally coating a Cu layer on membranes consisting of stacked electrospun nonconductive polymer nanofibers. The Cu coating, comprising fine‐grained Cu crystals, has an average thickness of circa 50 nm and a root‐mean‐square roughness of circa 5.3 nm, maintaining the topography of polymer nanofibers. For nanofiber membranes with a thickness ranging in a few micrometers, the conformal Cu layer coats all nanofibers in the outermost layers as well as in the bulk of the membrane. All demonstrated Cu‐coated nanofiber networks have sheet resistance <2.4 Ω ◽ , and gas permeability in the order of 10 −13 to 10 −15 m 2 , which are comparable to some commercialized carbon based micro‐/nanofiber GDEs. Particularly, these conductive nanofiber networks have excellent bending durability, with negligible conductivity degradation after 10 000 bending test cycles. The high conductivity, gas permeability, and flexibility of these 3D nanofiber networks allow for applications as GDEs into various flexible electrochemical devices.