Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202003407
Keywords
bifunctional catalysts; carbon nanotube macrofilms; flexible Zinc-air batteries; integrated electrodes; N-doped carbon nanotubes
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Funding
- National Natural Science Foundation of China [21403274, 11474101, 91745203]
- Fundamental Research Funds for the Central University of China [2015ZM151, 2018PY11, D2191120]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
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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.
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