双功能
析氧
过电位
电催化剂
材料科学
纳米纤维
纳米颗粒
电解质
化学工程
碳纳米纤维
碳化
催化作用
静电纺丝
双功能催化剂
聚丙烯腈
纳米技术
电极
化学
电化学
复合材料
碳纳米管
有机化学
聚合物
扫描电子显微镜
物理化学
工程类
作者
Mingxing Wu,Xiyao Tian,Wenlu Yang,Bingran Guo,Jianing Guo
标识
DOI:10.1016/j.electacta.2022.140090
摘要
Developing high-efficiency, low-cost and durable bifunctional catalysts for oxygen evolution and reduction reaction (OER and ORR) is paramount yet challenging for the application of rechargeable Zn-air batteries (ZABs). Herein, we prepared an unique wheat-like porous carbon nanofibers embedded with Co nanoparticles as a bifunctional oxygen electrocatalyst for ORR and OER, which was obtained by carbonizing the zeolitic imidazolate frameworks-Co and polyacrylonitrile electrospun nanofibers. The unique wheat-like porous structure not only provides a large specific surface area for the catalyst, but also facilitates the transport of electrolyte and oxygen during the electrocatalytic process, improving its catalytic activity. Meanwhile, the unique wheat-like structure with metal nanoparticles wrapped into the carbon nanofibers can avoid corrosion caused by alkaline electrolyte. The bifunctional catalyst displays excellent electrocatalytic performance for OER with a positive overpotential of 440 mV at 10 mA·cm−2 and ORR with a positive half-wave potential of 825 mV. Furthermore, the maximum power density of the assembled ZABs with catalyst [email protected] serving as the air electrode is 118.41 mW·cm−2, and this ZABs are able to cycle 200 h in galvanostatic discharge test. This work can offer some interesting design concepts for the construction of outstanding bifunctional catalysts toward rechargeable Zn-air batteries.
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