Please use this identifier to cite or link to this item:
|Title:||X-ray absorption spectroscopy and energy storage of Ni-doped cobalt nitride, (Ni0.33Co0.67)N, prepared by a simple synthesis route||Authors:||Das, B.
|Issue Date:||7-Mar-2013||Citation:||Das, B., Reddy, M.V., Chowdari, B.V.R. (2013-03-07). X-ray absorption spectroscopy and energy storage of Ni-doped cobalt nitride, (Ni0.33Co0.67)N, prepared by a simple synthesis route. Nanoscale 5 (5) : 1961-1966. ScholarBank@NUS Repository. https://doi.org/10.1039/c2nr33675h||Abstract:||Metal nitride (Ni0.33Co0.67)N nanoparticles are prepared by nitridation using NiCo2O4 as a precursor material by heating at 335 °C for 2 h in flowing NH3 + N 2 gas and characterized by X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), high resolution-transmission electron microscopy (HR-TEM), along with selective area electron diffraction (SAED) and X-ray absorption spectroscopy (XAS) techniques. The X-ray absorption near edge structure (XANES) at the Co K-edge showed that the oxidation state of cobalt is close to 3+. The (Ni0.33Co0.67)N showed a shift in edge energy towards lower values due to Ni-doping to cobalt site. The Li-storage behaviour of (Ni0.33Co0.67)N nanoparticles was evaluated by galvanostatic cycling and cyclic voltammetry in the cells with Li-metal as counter electrode in the voltage range of 0.005-3.0 V at ambient temperature. When cycled at 250 mA g-1, the first-cycle reversible capacity of 700 (±5) mA h g-1 (∼1.9 moles of Li) is obtained. It showed an initial decrease in capacity until the 10th cycle and a stable capacity of 400 (±5) mA h g-1 (∼1.09 moles of Li) is observed at the end of the 50th cycle. Excellent rate capability is also shown when cycling at 500 mA g-1 (up to 50 cycles). The materials showed excellent Li-ion insertion/extraction, with the coulombic efficiency reaching almost 99% in the range of 10-50 cycles. The average charge and discharge potentials are ∼2.03 and ∼1.0 V, respectively for the decomposition/formation of Li3N as determined by electroanalytical techniques. © 2013 The Royal Society of Chemistry.||Source Title:||Nanoscale||URI:||http://scholarbank.nus.edu.sg/handle/10635/98603||ISSN:||20403364||DOI:||10.1039/c2nr33675h|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Mar 9, 2021
WEB OF SCIENCETM
checked on Mar 9, 2021
checked on Feb 28, 2021
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.