A Facile and Scalable Strategy for Fabrication of Superior Bifunctional Freestanding Air Electrodes for Flexible Zinc–Air Batteries,Advanced Functional Materials

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A Facile and Scalable Strategy for Fabrication of Superior Bifunctional Freestanding Air Electrodes for Flexible Zinc–Air Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-06-29 , DOI: 10.1002/adfm.202003407
Ting Liu ₁ , Jirong Mou ₁ , Ziping Wu ₂ , Chao Lv ₂ , Jianlin Huang ₁ , Meilin Liu ₃

Affiliation

The large‐scale fabrication of efficient and inexpensive bifunctional catalysts is highly desirable but very challenging for oxygen reduction reaction and oxygen evolution reaction (ORR–OER) in metal–air batteries. Here, a facile and scalable approach for the fabrication of hierarchically porous air electrode consisting of cobalt nanoparticles embedded in bamboo‐like nitrogen‐rich carbon nanotubes (Co/N@CNTs), which are in situ grown onto the surface of carbon nanotube macrofilm (CNMF) through a catalytic growth of crosslinked carbon nanotubes is reported. The resulting hybrid macrofilm (Co/N@CNTs@CNMF) can be directly used as a freestanding air electrode without adding any binder or addivities. More importantly, when incorporated in a zinc–air battery (ZAB), the Co/N@CNTs@CNMF electrode demonstrates drastically enhanced ORR and OER activity while maintaining excellent durability during cycling. Further, when it is used to assemble an all‐solid‐state ZAB, the cell also displays excellent mechanical flexibility, implying promising perspectives as power sources for wearable electronics.

中文翻译：

一种用于柔性锌空气电池的优质双功能独立式空气电极制造的简便且可扩展的策略

高效且廉价的双功能催化剂的大规模生产是非常可取的，但对于金属-空气电池中的氧还原反应和氧释放反应（ORR-OER）却非常具有挑战性。在这里，一种简便而可扩展的方法用于制造分层多孔空气电极，该电极由嵌入纳米碳纳米管宏观膜表面上的竹状富氮碳纳米管（Co / N @ CNTs）中嵌入的钴纳米颗粒组成（已经报道了通过交联碳纳米管的催化生长而产生的CNMF。所得的混合大分子膜（Co / N @ CNTs @ CNMF）可以直接用作独立式空气电极，而无需添加任何粘合剂或添加剂。更重要的是，当安装在锌空气电池（ZAB）中时，Co / N @ CNTs @ CNMF电极在循环过程中具有出色的ORR和OER活性，同时保持了出色的耐久性。此外，当用于组装全固态ZAB时，该电池还具有出色的机械柔韧性，这暗示了其作为可穿戴电子设备电源的前景。

更新日期：2020-09-03

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