气候变化领域集成服务门户(CCPortal): Defect-rich and ultrathin N doped carbon nanosheets as advanced trifunctional metal-free electrocatalysts for the ORR, OER and HER

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DOI	10.1039/c8ee03276a
	Defect-rich and ultrathin N doped carbon nanosheets as advanced trifunctional metal-free electrocatalysts for the ORR, OER and HER
	Jiang H.; Gu J.; Zheng X.; Liu M.; Qiu X.; Wang L.; Li W.; Chen Z.; Ji X.; Li J.
发表日期	2019
ISSN	17545692
起始页码	322
结束页码	333
卷号	12 期号:1
英文摘要	Rational design and facile preparation of non-noble trifunctional electrocatalysts with high performance, low cost and strong durability for the oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are highly demanded, but remain as a big challenge. Herein, we report a spontaneous gas-foaming method to prepare nitrogen doped ultrathin carbon nanosheets (NCNs) by simply pyrolysing a mixture of citric acid and NH 4 Cl. Under the optimized pyrolysis temperature (carbonized at 1000 °C) and mass ratio of precursors (1:1), the synthesized NCN-1000-5 sample possesses an ultrathin sheet structure, an ultrahigh specific surface area (1793 m 2 g -1 ), and rich edge defects, and exhibits low overpotential and robust stability for the ORR, OER and HER. By means of density functional theory (DFT) computations, we revealed that the intrinsic active sites for the ORR, OER and HER are the carbon atoms located at the armchair edge and adjacent to the graphitic N dopants. When practically used as a catalyst in rechargeable Zn-air batteries, a high energy density (806 W h kg -1 ), a low charge/discharge voltage gap (0.77 V) and an ultralong cycle life (over 330 h) were obtained at 10 mA cm -2 for NCN-1000-5. This work not only presents a versatile strategy to develop advanced carbon materials with ultrahigh specific surface area and abundant edge defects, but also provides useful guidance for designing and developing multifunctional metal-free catalysts for various energy-related electrocatalytic reactions. © 2019 The Royal Society of Chemistry.
英文关键词	Carbon; Design for testability; Doping (additives); Electrocatalysis; Electrocatalysts; Electrolytic reduction; Gas foaming; Nanosheets; Oxygen; Specific surface area; Electrocatalytic reactions; High energy densities; Hydrogen evolution reactions; Metal-free catalysts; Metal-free electrocatalysts; Oxygen evolution reaction; Oxygen reduction reaction; Pyrolysis temperature; Density functional theory; catalysis; catalyst; citric acid; design; equipment component; hydrogen; nitrogen; optimization; oxygen; performance assessment; pyrolysis; reduction; zinc
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/190035
作者单位	School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China; College of Materials and Chemical Engineering, Hunan City University, Yiyang, 413000, China; Department of Chemistry, University of Puerto Rico Rio Piedras Campus, San Juan, PR 00931, United States; Hefei National Laboratory for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, China; Institute of Super-microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha, Hunan, China; School of Materials Science and Engineering, Central South University, Changsha, Hunan, China; Hunan Provincial Key Laboratory of Chemical Power Sources, Central South University, Changsha, Hunan, 410083, China
推荐引用方式 GB/T 7714	Jiang H.,Gu J.,Zheng X.,et al. Defect-rich and ultrathin N doped carbon nanosheets as advanced trifunctional metal-free electrocatalysts for the ORR, OER and HER[J],2019,12(1).
APA	Jiang H..,Gu J..,Zheng X..,Liu M..,Qiu X..,...&Li J..(2019).Defect-rich and ultrathin N doped carbon nanosheets as advanced trifunctional metal-free electrocatalysts for the ORR, OER and HER.Energy & Environmental Science,12(1).
MLA	Jiang H.,et al."Defect-rich and ultrathin N doped carbon nanosheets as advanced trifunctional metal-free electrocatalysts for the ORR, OER and HER".Energy & Environmental Science 12.1(2019).