气候变化领域集成服务门户(CCPortal): Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage

CCPortal

DOI	10.1039/c9ee00536f
	Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage
	Yang W.; Zhou J.; Wang S.; Zhang W.; Wang Z.; Lv F.; Wang K.; Sun Q.; Guo S.
发表日期	2019
ISSN	17545692
起始页码	1605
结束页码	1612
卷号	12 期号:5
英文摘要	Potassium-ion batteries (PIBs) have drawn much attention as a replacement for lithium-ion batteries (LIBs) owing to their low cost and high safety. However, it is still an open challenge to design stable and high-capacity nanocarbon for efficient intercalation/deintercalation of large K ions. Herein, we report a class of ultra-high pyrrolic/pyridinic-N-doped necklace-like hollow carbon (NHC) material as a novel free-standing anode for enhancing PIBs in terms of their capacity, rate ability and durability. The as-made NHC film features abundant hierarchical micro/meso/macro-pores, a necklace-like hollow structure, ultra-high pyrrolic/pyridinic-N doping and a high specific surface area, which could finally promote the intercalation/deintercalation of K ions, reduce the volume expansion and improve the stability of PIBs. These new characteristics allow the NHC to deliver a high reversible specific capacity of 293.5 mA h g-1 at 100 mA g-1, outstanding rate property (204.8 mA h g-1 at 2000 mA g-1) and cycling performance (161.3 mA h g-1 at 1000 mA g-1 after 1600 cycles), which represent the best performance for carbon-based non-metal materials for PIB anode. Density functional theory (DFT) calculations demonstrate that pyrrolic and pyridinic-N doping can efficiently change the charge density distribution of carbon and promote the adsorption of K+ on the NHC electrode, which promotes K ion storage. © 2019 The Royal Society of Chemistry.
英文关键词	Anodes; Carbon; Design for testability; Ions; Lithium-ion batteries; Potassium; Semiconductor doping; Charge density distributions; Cycling performance; Freestanding films; Hierarchical pores; High specific surface area; Intercalation/deintercalation; Reversible specific capacity; Volume expansion; Density functional theory; adsorption; carbon; chemical compound; electrode; ion; performance assessment
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189903
作者单位	Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China; BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, China; Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Yang W.,Zhou J.,Wang S.,et al. Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage[J],2019,12(5).
APA	Yang W..,Zhou J..,Wang S..,Zhang W..,Wang Z..,...&Guo S..(2019).Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage.Energy & Environmental Science,12(5).
MLA	Yang W.,et al."Freestanding film made by necklace-like N-doped hollow carbon with hierarchical pores for high-performance potassium-ion storage".Energy & Environmental Science 12.5(2019).