The present work demonstrates a facile route for the large-scale, catalyst free, and green synthesis approach of boron doped graphene (B-G) and its use as high performance anode material for Li ion battery (LIB) application. Boron atoms were doped into graphene framework with an atomic percentage of 5.93% via hydrogen induced thermal reduction technique using graphite oxide and boric acid as precursors. Various characterization techniques were used to confirm the boron doping in graphene sheets. B-G as anode material shows a discharge capacity of 548 mAh g-1 at 100 mA g-1 after 30th cycles. At high current density value of 1 A g-1, B-G as anode material enhances the specific capacity by about 1.7 times compared to pristine graphene. The present study shows a simplistic way of boron doping in graphene leading to an enhanced Li ion adsorption due to the change in electronic states. © 2014 Elsevier B.V. All rights reserved.

Sundara Ramaprabhu

Department Of Physics

K. P. Sreena

Anodes

Boric acid

boron

Characterization

Electronic states

Graphene oxide

Ionic liquids

Ions

Electric batteries

Electrodes

Graphene

lithium

BORON-DOPED GRAPHENE

BORON-DOPING

Characterization techniques

Discharge capacities

High current densities

HIGH-PERFORMANCE ANODE MATERIALS

Specific capacities

THERMAL REDUCTION

Lithium-ion battery

Lithium-ion batteries

Lithium batteries

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Materials Research Bulletin

Zero-dimensional graphene quantum dots have attractive properties but the synthesis of graphene quantum dots in a simple and scalable technique is tedious, which limits its utilization in different energy storage application. In this study, we present a simple and scalable approach to produce graphene quantum dots and heteroatom doped graphene quantum dots using chemical vapor deposition technique. Graphene quantum dots are prepared using alloy-based catalyst and methane as a carbon source. Boron-doped and nitrogen-doped graphene quantum dots are prepared at low temperature using graphite oxide without the use of dialysis bag. Here, the electrochemical lithium and sodium ion storage properties of doped and undoped graphene quantum dots are studied without being used as a supporting material for the performance enhancement as reported in previous reports. Boron doped GQD (B-GQD) exhibits a high specific capacity of 1097 mAh g−1 and 310 mAh g−1 at a specific current of 50 mA g−1 for lithium and sodium ion batteries respectively. B-GQD exhibits high volumetric energy density of 537 Ah L−1 and 214 Ah L−1 with an average voltage of 0.43 V and 0.57 respectively for lithium ion and sodium ion batteries. Also, the cells observe a satisfactory cyclic performance for 500 cycles with good capacity retention. Detailed investigations show that the edge defects present in GQD and doped GQDs help to enhance the electrochemical storage performance of lithium and sodium ions. © 2019 Elsevier B.V.

Applied Surface Science

Facile synthesis of heteroatom doped and undoped graphene quantum dots as active materials for reversible lithium and sodium ions storage

Boron doped graphene (BG) has been prepared using a facile technique and platinum (Pt) nanoparticles has been deposited on BG using different methods like sodium borohydride, polyol and modified polyol reduction method and used as oxygen reduction reaction (ORR) electrocatalyst in hydrogen fuel cell. The identification of crystal phases through X-ray diffraction (XRD) and the dispersion of the electrocatalyst by the Transmission Electronic Microscopy (TEM) have been studied. The electrochemically active surface area has been investigated by Cyclic Voltammetry (CV). The ORR activity has been evaluated by polarization studies using fuel cell fixture. Stability test also conducted in fuel cell mode for 50 h. This study revealed the superior ORR activity and stability of platinum nanoparticles decorated BG, which is synthesized by modified polyol reduction technique. Hence it can be considered as the alternative electrocatalyst for replacing contemporary electrocatalysts. © 2015 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

International Journal of Hydrogen Energy

Platinum on boron doped graphene as cathode electrocatalyst for proton exchange membrane fuel cells

A 1-D monohybrid of multiwalled carbon nanotubes and graphene sheets, graphene wrapped multiwalled carbon nanotubes (gC) structure, synthesized in a template-free simple chemical vapor deposition technique without any chemical functionalization, was employed as efficient anode material for Li ion battery. Graphene nanosheets affixed to the multiwalled carbon nanotubes (MWNTs) surface by van der Waal's attraction gives a wrinkled surface to the final 1-D gC configuration. The protrusions on the surface of the tube enhances the porosity of the system and also acts as defects, enhancing lithium adsorption sites while the inner MWNT core gives high electrical conductivity, resulting enhanced electrochemical performance of 373 mAh g-1 at 100 mA g-1 current density after 150 cycles. © 2015 Elsevier Ltd. All rights reserved.

Electrochimica Acta

Effect of wrinkles on electrochemical performance of multiwalled carbon nanotubes as anode material for Li ion battery

We report a facile strategy to synthesize SnO2 nanoparticles dispersed nitrogen doped graphene (SnO2/NG). Nitrogen doping of graphene was carried out by the pyrolysis of polypyrrole coated poly(sodium 4-styrenesulfonate) functionalized graphene. The SnO2 nanoparticles are dispersed over nitrogen doped graphene by a modified polyol reduction method. The dispersed SnO2 nanoparticles are 2-3 nm in size with homogeneous dispersion and good crystallinity. The SnO2/NG as an anode material in Li ion batteries displays superior reversible capacity, very good rate capability and excellent cyclic performance (1220 mA h g-1 after 100th cycle). The impedance measurements show that nitrogen doping can significantly reduce the charge transfer resistance of graphene based electrodes. The factors contributing to the excellent electrochemical performance of the SnO2/NG anode material is discussed. The present work opens a new pathway for the development of metal or metal oxide nanoparticle-nitrogen doped carbon nanostructure based nanocomposites for high performance electrochemical energy devices. © 2013 The Royal Society of Chemistry.

Fulltext

Journal of Materials Chemistry A

Facile synthesis of SnO2 nanoparticles dispersed nitrogen doped graphene anode material for ultrahigh capacity lithium ion battery applications

We report a novel way of synthesizing graphene-carbon nanotube hybrid nanostructure as an anode for lithium (Li) ion batteries. For this, graphene was prepared by the solar exfoliation of graphite oxide, while multiwalled carbon nanotubes (MWNTs) were prepared by the chemical vapor deposition method. The graphene-MWNT hybrid nanostructure was synthesized by first modifying graphene surface using a cationic polyelectrolyte and MWNT surface with acid functionalization. The hybrid structure was obtained by homogeneous mixing of chemically modified graphene and MWNT constituents. This hybrid nanostructure exhibits higher specific capacity and cyclic stability. The strengthened electrostatic interaction between the positively charged surface of graphene sheets and the negatively charged surface of MWNTs prevents the restacking of graphene sheets that provides a highly accessible area and short diffusion path length for Li-ions. The higher electrical conductivity of MWNTs promotes an easier movement of the electrons within the electrode. The present synthesis scheme recommends a new pathway for large-scale production of novel hybrid carbon nanomaterials for energy storage applications and underlines the importance of preparation routes followed for synthesizing nanomaterials. © 2012 The Royal Society of Chemistry.

Journal of Materials Chemistry

Synthesis of graphene-multiwalled carbon nanotubes hybrid nanostructure by strengthened electrostatic interaction and its lithium ion battery application

Small

Graphene and Graphene-Based Materials for Energy Storage Applications

Facile synthesis of boron and nitrogen-doped graphene as efficient electrocatalyst for the oxygen reduction reaction in alkaline media

Physical Review B

Growth and electronic structure of boron-doped graphene

Green synthesis of boron doped graphene and its application as high performance anode material in Li ion battery

Journal	Data powered by TypesetMaterials Research Bulletin
Publisher	Data powered by TypesetElsevier Ltd
ISSN	00255408
Open Access	No