期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 14, 页码 16512-16520出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01603
关键词
helical carbon nanotubes; high yield and purity; oxygen reduction reaction; Al-air battery; binder-free electrode
资金
- Natural Sciences and Engineering Research Council of Canada, Canada Research Chair Program
- National Nature Science Foundation of China [21471054, 21878340]
- Nature Science Foundation of Hubei Province [2019CFB364]
- Hubei Key Laboratory Analysis AMP
- Reuse Technology (Hubei Normal University) [PA180103]
Efficient and stable electrocatalysts for oxygen reduction reaction and freestanding electrode structure were developed to reduce the use of polymer binders in the cathode of metalair batteries. Considering the unique geometrical configurations of helical carbon nanotubes (CNTs) and improved properties compared with straight CNTs, we prepared high-purity Co@CoOx/helical nitrogen-doped carbon nanotubes (Co@CoOx/HNCNTs) on a carbon fiber paper by hydrothermal and single-step in situ chemical vapor deposition strategies. Under an optimized growth time (1 h), the synthesized Co@CoOx/HNCNTs provide richer edge defects and active sites and show prominent electrocatalytic performance toward oxygen reduction reaction (ORR) under alkaline media compared with Co@CoOx/HNCNTs-0.5 h and Co@CoOx/HNCNTs-2 h. The soft X-ray absorption spectroscopy technique is used to investigate the influences of different growth times on the electronic structure and local chemical configuration of Co@CoOx/HNCNTs. Furthermore, the Alair coin cell employing Co@CoOx/HNCNTs-1 h as the binder-free cathode exhibits an open-circuit voltage of 1.48 V, a specific capacity of 367.31 mA h g1 at the discharge current density of 1.0 mA cm(2), and a maximum power density (Pmax) of 3.86 mW cm(2), which are superior to those of Co@CoOx/HNCNTs-0.5 h and Co@CoOx/HNCNTs-2 h electrodes. This work provides valuable insights into the development of scalable binder-free cathodes, exploiting HNCNT composite materials with an outstanding electrocatalytic performance for ORR in Alair systems.
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