Nickel/carbon core/shell nanotubes: Lanthanum nickel alloy catalyzed synthesis, characterization and studies on their ferromagnetic and lithium-ion storage properties

Journal Article · Mon Dec 15 00:00:00 EST 2014 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.09.033· OSTI ID:22420704

Anthuvan Rajesh, John ^[1]; Pandurangan, Arumugam ^[1]; Senthil, Chenrayan; Sasidharan, Manickam ^[2]

---

1. Department of Chemistry, Institute of Catalysis and Petroleum Technology, Anna University, Chennai 600025, Tamil Nadu (India)
2. SRM Research Institute, SRM University, Kancheepuram 603203, Tamil Nadu (India)

Highlights: • Ni/CNTs core/shell structure was synthesized using LaNi{sub 5} alloy catalyst by CVD. • The magnetic and lithium-ion storage properties of Ni/CNTs structure were studied. • The specific Ni/CNTs structure shows strong ferromagnetic property with large coercivity value of 446.42 Oe. • Ni/CNTs structure shows enhanced electrochemical performance in terms of stable capacity and better rate capability. - Abstract: A method was developed to synthesize ferromagnetic nickel core/carbon shell nanotubes (Ni/CNTs) by chemical vapor deposition using Pauli paramagnetic lanthanum nickel (LaNi{sub 5}) alloy both as a catalyst and as a source for the Ni-core. The Ni-core was obtained through oxidative dissociation followed by hydrogen reduction during the catalytic growth of the CNTs. Transmission electron microscopy (TEM), selected area electron diffraction (SAED) and X-ray diffraction (XRD) analyses reveal that the Ni-core exists as a face centered cubic single crystal. The magnetic hysteresis loop of Ni/CNTs particle shows increased coercivity (446.42 Oe) than bulk Ni at room temperature. Furthermore, the Ni/CNTs core/shell particles were investigated as anode materials in lithium-ion batteries. The Ni/CNTs electrode delivered a high discharge capacity of 309 mA h g{sup −1} at 0.2 C, and a stable cycle-life, which is attributed to high structural stability of Ni/CNTs electrode during electrochemical lithium-ion insertion and de-insertion redox reactions.

• OSTI ID: 22420704
• Journal Information: Materials Research Bulletin, Vol. 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CATALYSTS
CHEMICAL VAPOR DEPOSITION
COERCIVE FORCE
ELECTROCHEMISTRY
ELECTRON DIFFRACTION
FCC LATTICES
LANTHANUM ALLOYS
LITHIUM ION BATTERIES
MAGNETIC PROPERTIES
MONOCRYSTALS
NANOTUBES
NICKEL
NICKEL ALLOYS
OXIDATION
PARAMAGNETISM
REDOX REACTIONS
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION