Journal ArticleDOI
Defect Engineering toward Atomic Co–Nx–C in Hierarchical Graphene for Rechargeable Flexible Solid Zn-Air Batteries
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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
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Journal ArticleDOI
Defective/Doped Graphene‐Based Materials as Cathodes for Metal–Air Batteries
TL;DR: In this article , the relationship between graphene defects/doping and electrocatalytic mechanisms is clarified, and future directions are also prospected for the development of graphene-based MAB cathodes.
Journal ArticleDOI
Outstanding Platinum Group Metal-free Bifunctional Catalysts for Rechargeable Zinc-Air Batteries
Kaur Muuli,Xiang Lyu,Marek Mooste,Maike Käärik,Barr Zulevi,Jaan Leis,Haoran Yu,David A. Cullen,Alexey Serov,Kaido Tammeveski +9 more
TL;DR: In this article , the effect of synthesis conditions on the catalyst performance at ZAB air electrode was investigated and the results show that the PA-450-HT exhibits excellent electrocatalytic activity toward oxygen reduction reaction (ORR) and it is the most suitable catalyst for primary ZAB with the galvanostatic polarization discharge peak power density of 149 mW cm−2, outperforming commercial Pt-Ru/C catalysts.
Journal ArticleDOI
Manipulating the Electronic Structure of Graphite Intercalation Compounds for Boosting the Bifunctional Oxygen Catalytic Performance.
TL;DR: In this article , a few-layer FeCl3 -NiCl2 -GIC catalyst was designed as bifunctional oxygen catalysts for future zinc air batteries (ZABs) for the oxygen reduction and oxygen evolution reaction (ORR/OER).
Journal ArticleDOI
Atomic CoN3S1 sites for boosting oxygen reduction reaction via an atomic exchange strategy
TL;DR: In this paper, an A-CoN3S1@C electrocatalyst with atomic CoN 3S1 active sites loaded on N, S-codoped porous carbon was produced by an atomic exchange strategy.
Journal ArticleDOI
Electronic Delocalization Regulates the Occupancy and Energy Level of Co 3dz2 Orbitals to Enhance Bifunctional Oxygen Catalytic Activity
Yun-Long Zhang,Bob Liu,Yun-Kun Dai,Yun-Fei Xia,Pan Guo,Yang Liu,Fantao Kong,Qianyu Zhang,Li Zhao,Zhenbo Wang +9 more
TL;DR: In this article , a robust electrostatic selfassembly strategy is developed to engineer penta-coordinated Co sites by introducing axial O ligands with atomic-level precision to form CoN4O1 configurations on MXene nanosheets (CoN4•O/MX).
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.