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
Achieving high energy density and efficiency through integration: progress in hybrid zinc batteries
TL;DR: In this article, three types of hybrid Zn batteries (Zn−Ni/air, Zn−Co/air and Zn-Ag/air) are introduced in detail, based on the positive electrode materials.
Journal ArticleDOI
Co/CoNx decorated nitrogen-doped porous carbon derived from melamine sponge as highly active oxygen electrocatalysts for zinc-air batteries
TL;DR: In this paper, a Co/CoNx decorated N-doped porous carbon hybrid with two different morphologies were prepared using commercially available melamine sponge as the precursor, and the assembled Co/HMSC-based Zn-air battery showed excellent rechargeability with a small 0.2-V drop in its continuous charge-discharge cycles for 51.6
Journal ArticleDOI
Non-precious metal electrocatalysts design for oxygen reduction reaction in polymer electrolyte membrane fuel cells: Recent advances, challenges and future perspectives
TL;DR: In this paper, the development in non-precious nanomaterial-based electrocatalysts and emphasis on the several kinds of non-noble electrocatalyst with enhanced ORR efficiency is discussed.
Journal ArticleDOI
Encapsulating sodium deposition into carbon rhombic dodecahedron guided by sodiophilic sites for dendrite-free Na metal batteries
Yangyang Xie,Junxian Hu,Zexun Han,Wang Taosheng,Jingqiang Zheng,Lang Gan,Yanqing Lai,Zhian Zhang +7 more
TL;DR: In this article, a porous nitrogen-anchored carbon rhombic dodecahedron (CoNC) embedded with Co nanoparticles is designed to uniform Na nucleation and deposition for sodium metal anodes, integrating high surface area and high conductivity.
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.