Journal ArticleDOI
Defect Engineering toward Atomic Co–Nx–C in Hierarchical Graphene for Rechargeable Flexible Solid Zn-Air Batteries
TLDR
This work demonstrates the direct utilization of the intrinsic structural defects in nanocarbon to generate atomically dispersed Co-Nx -C active sites via defect engineering and provides a new concept and effective methodology for the full utilization ofnanocarbon materials with various structural features and further development of advanced energy materials.Abstract:
Rechargeable flexible solid Zn-air battery, with a high theoretical energy density of 1086 Wh kg−1, is among the most attractive energy technologies for future flexible and wearable electronics; nevertheless, the practical application is greatly hindered by the sluggish oxygen reduction reaction/oxygen evolution reaction (ORR/OER) kinetics on the air electrode. Precious metal-free functionalized carbon materials are widely demonstrated as the most promising candidates, while it still lacks effective synthetic methodology to controllably synthesize carbocatalysts with targeted active sites. This work demonstrates the direct utilization of the intrinsic structural defects in nanocarbon to generate atomically dispersed Co–Nx–C active sites via defect engineering. As-fabricated Co/N/O tri-doped graphene catalysts with highly active sites and hierarchical porous scaffolds exhibit superior ORR/OER bifunctional activities and impressive applications in rechargeable Zn-air batteries. Specifically, when integrated into a rechargeable and flexible solid Zn-air battery, a high open-circuit voltage of 1.44 V, a stable discharge voltage of 1.19 V, and a high energy efficiency of 63% at 1.0 mA cm−2 are achieved even under bending. The defect engineering strategy provides a new concept and effective methodology for the full utilization of nanocarbon materials with various structural features and further development of advanced energy materials.read more
Citations
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Journal ArticleDOI
Covalent organic frameworks derived carbon supported cobalt ultra-small particles: C O and Co-Nx complex sites activated peroxymonosulfate synergistically for efficient degradation of levofloxacin
TL;DR: In this article , covalent organic frameworks (COF) derived carbon materials with abundant CO and ultra-small Co particles were synthesized by simple hydrothermal and calcination.
Journal ArticleDOI
Rational Design of Single Atomic Co in CoNx Moieties on Graphene Matrix as an Ultra-Highly Efficient Active Site for Oxygen Reduction Reaction
Yasuhiro Shu,Koji Miyake,Javier Quílez-Bermejo,Yexin Zhu,Yuichiro Hirota,Yoshiaki Uchida,Shunsuke Tanaka,Emilia Morallón,Diego Cazorla-Amorós,Chang Yi Kong,Norikazu Nishiyama +10 more
TL;DR: In this article, the authors proposed a project called Project RTI2018-095291-B-I00, which is based on the MICIINUN and FEDER for financial support.
Journal ArticleDOI
Facile Fabrication of Nitrogen, Phosphorus and Silicon Co-Doped Porous Carbon as an Efficient Oxygen Reduction Catalyst for Primary Zn-Air Battery
TL;DR: In this article, the authors developed economical and efficient catalysts for accelerating the oxygen reduction reaction (ORR) endowed with sluggish kinetics involved in renewable energy generation, which is highly pleasurable but challenging.
Journal ArticleDOI
In situ confinement of iron-based active sites within high porosity carbon frameworks with enhanced activity for rechargeable Zn–air battery
TL;DR: In this paper , in situ confinement of FeNx active sites in high porosity carbon framework (FeNx/CMCC) derived from chelate of carboxymethylcellulose (CMC) and iron ions was synthesized.
Journal ArticleDOI
Cobalt nanoparticles-encapsulated holey nitrogen-doped carbon nanotubes for stable and efficient oxygen reduction and evolution reactions in rechargeable Zn-air batteries
TL;DR: In this article , a new, simple, and inexpensive approach for fabricating electrocatalysts is developed to optimize oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) efficiency rechargeable Zn-air batteries.
References
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Journal ArticleDOI
Nitrogen-doped carbon nanotube arrays with high electrocatalytic activity for oxygen reduction.
TL;DR: It is reported that vertically aligned nitrogen-containing carbon nanotubes (VA-NCNTs) can act as a metal-free electrode with a much better electrocatalytic activity, long-term operation stability, and tolerance to crossover effect than platinum for oxygen reduction in alkaline fuel cells.
PatentDOI
Metal-free bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions
TL;DR: A mesoporous carbon foam co-doped with nitrogen and phosphorus that has a large surface area and good electrocatalytic properties for both ORR and OER and is tested as an air electrode for primary and rechargeable Zn-air batteries.
Journal ArticleDOI
Metal–air batteries: from oxygen reduction electrochemistry to cathode catalysts
Fangyi Cheng,Jun Chen +1 more
TL;DR: The battery electrochemistry and catalytic mechanism of oxygen reduction reactions are discussed on the basis of aqueous and organic electrolytes, and the design and optimization of air-electrode structure are outlined.
Journal ArticleDOI
Metal–Air Batteries with High Energy Density: Li–Air versus Zn–Air
TL;DR: Li-air and Zn-air batteries have been studied extensively in the past decade as mentioned in this paper, with the aim of providing a better understanding of the new electrochemical systems, and metal-air battery with conversion chemistry is a promising candidate.
Journal ArticleDOI
Recent advances in zinc–air batteries
Yanguang Li,Hongjie Dai +1 more
TL;DR: The fundamentals, challenges, and latest exciting advances related to zinc-air research are presented, and the detrimental effect of CO2 on battery performance is emphasized, and possible solutions summarized.