Oct 13, 2015 N-doped graphene was prepared by ball milling of graphite with melamine. It was found that ball-milling reduced the size of graphite particles from 30 to 1 μm and facilitated the exfoliation of the resultant small particles into few-layer N-doped graphene nanosheets under ultrasonication.The as-prepared N-doped graphene nanoplatelets (NGnPs) exhibited a nitrogen content as high as 11.4 at

Jul 26, 2017 @article{osti_1425062, title = {Nitrogen-doped graphene catalysts: High energy wet ball milling synthesis and characterizations of functional groups and particle size variation with time and speed}, author = {Zhuang, Shiqiang and Nunna, Bharath Babu and Boscoboinik, Jorge Anibal and Lee, Eon Soo}, abstractNote = {Nitrogen-doped graphene (N-G) catalyst emerges as one of the promising

Abstract: N-doped graphene was prepared by ball milling of graphite with melamine. It was found that ball-milling reduced the size of graphite particles from 30 to 1 m and facilitated the exfoliation of the resultant small particles into few-layer N-doped graphene nanosheets under ultrasonication

Jan 10, 2018 Boron and nitrogen co-doped graphene-like carbon (BNG) is a metal-free catalyst that has been synthesized by combining ball-milling with thermal treatment. Firstly, the edge-selectively-functionalized graphene nanoplatelets (EFGnPs) were prepared by ball milling of the pristine graphite, which can facilitate boron incorporation

N-doped graphene was shown to possess a nitrogen content as high as 11.4 at.% as well as good electrical and electrochemical properties attractive for energy storageandconversion.Asfarasweareaware,thepre-paration of N-doped graphene by ball-milling gra-phite with N-containing organic compounds has not beenpreviouslyreported. Resultsanddiscussion

Ju et al. [49] found that N in forms of pyrrolic-N and pyridinic-N can be successfully doped on the surface of graphite by ball-milling (500 rpm and 48 h) in N 2 atmosphere, due to the exothermic

A doable, low cost, green and scalable method is demonstrated to synthesize N-doped graphene/CNTs composite using humic acid (HA) and urea via ball mill technique

Ball-milled sulfur-doped graphene materials obtained from two types of ball-milling apparatus, specifically made up of stainless steel and zirconium dioxide, were investigated. Zirconium dioxide-based ball-milled sulfur-doped graphene materials contain a drastically lower amount of metallic impurities than stainless steel-based ball-milled

Jul 12, 2016 The results show that the electron transfer number of the N‐G catalyst with 23.2 at% nitrogen doping content, synthesized by the high‐energy wet ball milling method, has attained a value of 3.87, which is close to the number (3.95) of Pt/C catalysts, and the grinding time was found to be a significant factor in the properties of N‐G catalysts in the experiments

Jul 15, 2019 Recently, a ball-milling method has been devised to eco-friendly produce N-doped carbon materials (e.g., graphene) , , . Ball milling uses the kinetic energy of moving balls to break chemical bonding and produce new surfaces by fracturing feedstock particles [22] , [23]

Mar 30, 2018 Preparation of N-doped graphene-like carbon. In a typical preparation process, 5 g of pristine graphite was put into a ball-milling apparatus containing 200 g stainless steel balls of 5 mm in diameter. Then, the apparatus was sealed and fixed in the planetary ball-milling machine, and agitated with 750 rpm for 48 h

Jan 15, 2020 Here, novel Fe-N-doped graphene is successfully synthesized via a one-step in situ ball milling method. Pristine graphite, ball milling graphene, N-doped graphene and Fe-N-doped graphene are applied in air cathodes, and enhanced performance is observed in microbial fuel cells with graphene-based catalysts

Sep 19, 2018 Nitrogen-doped graphene wrapped MnO 2 nanoflowers (N-G-MnO 2) have been successfully synthesized via a simple scalable method.N-graphene nanosheets were prepared first by ball milling graphite and urea followed by mixing of N-graphene and MnO 2 nanoflowers that was microwaved for only a few minutes to form N-G-MnO 2 nanoflowers. The self-assembled layer of N-G

Feb 28, 2020 Second, ball milling is an effective method to uniformly cover the precursor on the surface of KCl. The as-synthesized sample presents the carbon nanocage structure doped with N and Co elements and exhibits a considerably improved electrocatalytic activity with an onset potential of 0.924 V (vs. RHE). Experiment Material synthesis

May 22, 2015 (a) Schematic of mechanochemical ball-milling-driven doping antimony (Sb) to the edges of graphene nanoplatelets (GnPs). SEM images

May 31, 2018 Herein, we have developed a rapid mechanical ball milling approach to synthesize highly-dispersed Fe/Co/N on graphene as OER electrocatalyst, which displays high OER performance with overpotential of 288 mV at 10 mA cm −2 and no obvious decay after 9 h of continuous operation at 10 mA cm −2. This excellent electrocatalytic performance originates from atomic-scale accessible

Xue et al. improved the graphene exfoliation process by ball milling graphite with melamine to produce nitrogen-doped graphene, which they effectively employed in supercapacitors’ electrodes. The nitrogen concentration of the resulting N-doped graphene was found to be 11.4%, with good electrical and chemical features that make it suitable for

Sep 01, 2015 Abstract. N-doped carbon materials are promising metal-free catalysts for a number of applications. In this work, a cost effective and easy method to prepare N-doped carbon nanotubes by ball milling was developed, which avoids the use of solvents and production of wastes. Melamine and urea were used as nitrogen precursors

3N [email protected]) produced by ball milling g-C 3N 4 prepared from pyrolysis of cyanamide under a flow of argon gas and N-doped graphene from modified Hummer’s method. 2. Experimental section 2.1. Synthesis of graphitic carbon nitride from cyanamide The graphitic carbon nitride was prepared by pyrolysis of cya-namide under a flow of argon gas

16 hours ago Heteroatom-doped carbon materials, such as P-doped carbon xerogel [], N-doped nanotube [11,12], S-doped carbon [13,14] and B-doped graphene [], are among the most promising electrocatalysts for ORR due to their advantages of relatively low cost, abundant reserves, good electronic conductivity and environmental friendliness [16,17].Among them, N-doping has been

Ball milling has been widely used for mechano-chemical synthesis. 8,10 We have shown that nitrogen can be effectively doped with materials by ball milling in the presence of nitrogen gas. 25,26 It was demonstrated that mechanical energy of ball milling can break the chemical bonds in solid materials and produce dangling bonds, which are very