Journal
ADVANCED SCIENCE
Volume 9, Issue 13, Pages -Publisher
WILEY
DOI: 10.1002/advs.202200614
Keywords
high-flux plasma enhanced chemical vapor deposition (HPECVD); in situ codoping; metal-free ORR and OER catalysis; plasma diagnostics; vertical graphene crystal; zinc-air batteries
Categories
Funding
- National Natural Science Foundation of China [51602290, 91233101, 11174256, 52104314]
- Fundamental Research Program from the Ministry of Science and Technology of China [2014CB31704]
- Key R&D and Promotion Project of Henan Province [212102210600]
- Zhengzhou Materials Genome Institute
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A high-performance metal-free bifunctional catalyst was successfully synthesized for rechargeable zinc-air batteries, outperforming traditional precious-metal catalysts in terms of performance. This research provides a solid foundation for developing low-cost, resource-sustainable, and eco-friendly metal-free zinc-air batteries.
Rechargeable zinc-air batteries (ZABs) have attracted great interests for emerging energy applications. Nevertheless, one of the major bottlenecks lies in the fabrication of bifunctional catalysts with high electrochemical activity, high stability, low cost, and free of precious and rare metals. Herein, a high-performance metal-free bifunctional catalyst is synthesized in a single step by regulating radicals within the recently invented high-flux plasma enhanced chemical vapor deposition (HPECVD) system equipped with in situ plasma diagnostics. Thus-derived (N, O)-doped vertical few-layer graphene film (VGNO) is of high areal population with perfect vertical orientation, tunable catalytic states, and configurations, thus enabling significantly enhanced electrochemical kinetic processes of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) with reference to milestone achievements to date. Application of such VGNO to aqueous ZABs (A-ZABs) and flexible solid-state ZABs (S-ZABs) exhibited high discharge power density and excellent cycling stability, which remarkably outperformed ZABs using benchmarked precious-metal based catalysts. The current work provides a solid basis toward developing low-cost, resource-sustainable, and eco-friendly ZABs without using any metals for outstanding OER and ORR catalysis.
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