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- Title
Hierarchical porous yolk-shell Co-N-C nanocatalysts encaged ingraphene nanopockets for high-performance Zn-air battery.
- Authors
Liu, Yisi; Li, Zongxu; Wang, Shizhu; Xuan, Jinnan; Xiong, Dongbin; Zhou, Lina; Zhou, Jianqing; Wang, Jun; Yang, Yahui; Du, Yue
- Abstract
The rational design and preparation of promising cathode electrocatalysts with excellent activity and strong stability for metal-air batteries is a huge challenge. In this work, we innovate an approach of combining solvothermal with high-temperature pyrolysis utilizing zeolitic imidazolate framework (ZIF)-8 and ZIF-67 as the template to synthesize a novel hybrid material of hierarchical porous yolk-shell Co-N-C polyhedron nanocatalysts engaged in graphene nanopocket (yolk-shell Co-N-C@GNP). The obtained catalyst exhibits prominent bifunctional electrocatalytic performance for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in the alkaline condition, in which the half-wave potential is 0.86 V for ORR, and the over-potential for OER is 0.42 V at 10 mA·cm−2. The rechargeable aqueous Zn-air battery fabricated with yolk-shell Co-N-C@GNP cathode deliveries an open circuit voltage (OCV) of 1.60 V, a peak power density of 236.2 mW·cm−2, and excellent cycling stability over 94 h at 5 mA·cm−2. The quasi-solid-state Zn-air battery (ZAB) using yolk-shell Co-N-C@GNP displays a high OCV of 1.40 V and a small voltage gap of 0.88 V in continuous cycling tests at 2 mA·cm−2. This work provides a valuable thought to focus attention on the design of high-efficient bifunctional catalysts with hierarchical porous yolk-shell framework and high-density metal active sites for metal-air battery technologies.
- Subjects
NANOPARTICLES; OPEN-circuit voltage; OXYGEN evolution reactions; METAL-air batteries; HYBRID materials; FORMYLATION; SOLID-state fermentation
- Publication
Nano Research, 2023, Vol 16, Issue 7, p8893
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-023-5593-2