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
Citations
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A novel iron-based composite flocculant for enhanced wastewater treatment and upcycling hazardous sludge into trifunctional electrocatalyst
Yinglin Zhang,Yulin Shi,Yulin Shi,Bo Yan,Fuping Zhang,Shengting Wang,Changchun Fan,Long Chen,Xiaolin Xu,Xiaolin Xu,Xuhong Guo,Xuhong Guo +11 more
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Porous carbon nanofibers confined NiFe alloy nanoparticles as efficient bifunctional electrocatalysts for Zn-air batteries
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Highly Dispersed Co Atoms Anchored in Porous Nitrogen-Doped Carbon for Acidic H2o2 Electrosynthesis
Jingjing Zhang,Wei Liu,Feng He,Min-Jin Song,Xiaoming Huang,Tao Shen,Jingwen Li,Chang Zhang,Jian Zhang,Deli Wang +9 more
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Bifunctional Single-Atom Cobalt Electrocatalysts with Dense Active Sites Prepared via a Silica Xerogel Strategy for Rechargeable Zinc–Air Batteries
TL;DR: In this paper , a facile silica xerogel strategy is designed to synthesize uniformly dispersed and dense Co-Nx active sites on N-doped highly porous carbon networks (Co-N-C SAC) using economic biomass materials.
Journal ArticleDOI
ZIF‐Mediated Anchoring of Co species on N‐doped Carbon Nanorods as an Efficient Cathode Catalyst for Zn‐Air Batteries
Qiang Yu,Jianshuai Lv,Jiantao Li,Ruohan Yu,Jinsong Wu,Shibo Xi,Xinyuan Li,Nuo Xu,Liang Zhou,Li Mai +9 more
TL;DR: In this article , a zeolitic imidazolate framework (ZIF) mediated strategy to anchor Co species on N-doped carbon nanorods for efficient oxygen reduction reaction (ORR) was developed.
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.