Conformal Cu Coating on Electrospun Nanofibers for 3D Electro‐Conductive Networks,Advanced Electronic Materials

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Conformal Cu Coating on Electrospun Nanofibers for 3D Electro‐Conductive Networks
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2019-12-23 , DOI: 10.1002/aelm.201900767
Fuze Jiang _{1,

2} , Wenbo Ju ₂ , Zhengyuan Pan _{1,

2,

3} , Luchan Lin ₂ , Yang Yue _{1,

2} , Yi‐Bo Zhao _{1,

2} , Congju Li ₄ , Frank Clemens ₂ , Corsin Battaglia ₂ , Jing Wang _{1,

2}

Affiliation

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 m², 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.

中文翻译：

用于3D导电网络的静电纺纳米纤维上的保形铜涂层

导电纳米纤维网络作为气体扩散电极（GDE）在固-液-气三相界面上运行具有潜在的应用。基于通用的方法，在将堆叠的电纺非导电聚合物纳米纤维组成的膜上共形涂覆铜层的基础上，开发出了柔性GDE。包含细晶粒铜晶体的铜涂层的平均厚度约为50纳米，均方根粗糙度约为5.3纳米，从而保持了聚合物纳米纤维的形貌。对于厚度在几微米范围内的纳米纤维膜，保形铜层覆盖了最外层以及整个膜中的所有纳米纤维。所有已证明的涂有铜的纳米纤维网络的薄层电阻< _2.4Ω◽，气体渗透率约为10^-13至10 ^-15 m ²，与某些商业化的碳基微纤维/纳米纤维GDE相当。特别地，这些导电纳米纤维网络具有优异的弯曲耐久性，在10000次弯曲测试循环后，导电性的降低可忽略不计。这些3D纳米纤维网络的高电导率，透气性和灵活性允许将GDE用作各种柔性电化学装置。

更新日期：2020-02-13

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