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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Journal ArticleDOI
Silk-Derived Highly Active Oxygen Electrocatalysts for Flexible and RechargeableZn–Air Batteries
Chunya Wang,Nan-Hong Xie,Yelong Zhang,Zheng-Hong Huang,Kailun Xia,Huimin Wang,Shaojun Guo,Bo-Qing Xu,Yingying Zhang +8 more
TL;DR: Flexible and rechargeable Zn-air batteries, because of their high energy density, low cost, and environmental and human benignity, are one kind of the most attractive energy systems for future wear as discussed by the authors.
Journal ArticleDOI
3D Hierarchical Porous Graphene-Based Energy Materials: Synthesis, Functionalization, and Application in Energy Storage and Conversion
Cheng Tang,Cheng Tang,Hao-Fan Wang,Hao-Fan Wang,Jia-Qi Huang,Weizhong Qian,Fei Wei,Shi-Zhang Qiao,Qiang Zhang +8 more
TL;DR: In this article, a review of 3D hierarchical porous graphene (hpG)-based materials with micro-, meso-, and macroporous features has been presented, including controllable and facile synthesis through chemical vapor deposition on 3D porous templates, post-assembly/treatment of graphene oxide nanosheets, and templated polymerization.
Journal ArticleDOI
Identifying the structure of Zn-N 2 active sites and structural activation
Feng Li,Yunfei Bu,Gao-Feng Han,Hyuk-Jun Noh,Seok-Jin Kim,Ishfaq Ahmad,Yalin Lu,Peng Zhang,Hu Young Jeong,Zhengping Fu,Qin Zhong,Jong-Beom Baek +11 more
TL;DR: The authors demonstrate the synthesis and structural identification of Zn based active sites, as well as the related structural activation for oxygen species.
Journal ArticleDOI
Self‐Catalyzed Growth of Co–N–C Nanobrushes for Efficient Rechargeable Zn–Air Batteries
Hao Luo,Hao Luo,Wen-Jie Jiang,Shuai Niu,Xing Zhang,Yun Zhang,Lu-Pan Yuan,Chuanxin He,Jin-Song Hu +8 more
TL;DR: Benefiting from the increase of accessible highly active sites and enhanced mass transfer and electron transportation, the present Co-N-C nanobrush exhibits superior electrocatalytic activity and durability when used as a bifunctional oxygen catalyst and enables a rechargeable Zn-air battery with a high peak power density and excellent cycling stability.
Journal ArticleDOI
Electronic-Structure Tuning of Water-Splitting Nanocatalysts
TL;DR: In this article, the authors highlight recent fundamental and experimental progress on tuning the electronic structure of electrocatalysts for enhanced electrochemical water splitting (EWS), including alloying, doping, interfacing, incorporating oxygen vacancies, and edge defect engineering.
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.