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Evolution of the electrochemical capacitance of transition metal oxynitrides with time: the effect of ageing and passivation

Kartachova,O, Chen,Y, Jones,R, Chen,Y, Zhang,H and Glushenkov,AM 2014, Evolution of the electrochemical capacitance of transition metal oxynitrides with time: the effect of ageing and passivation, Journal of materials chemistry A, vol. 2, no. 32, pp. 12940-12951, doi: 10.1039/c4ta00220b.

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Title Evolution of the electrochemical capacitance of transition metal oxynitrides with time: the effect of ageing and passivation
Author(s) Kartachova,O
Chen,YORCID iD for Chen,Y orcid.org/0000-0002-7322-2224
Jones,R
Chen,YORCID iD for Chen,Y orcid.org/0000-0002-7322-2224
Zhang,H
Glushenkov,AM
Journal name Journal of materials chemistry A
Volume number 2
Issue number 32
Start page 12940
End page 12951
Publisher Royal Society of Chemistry
Place of publication London, Eng.
Publication date 2014-08-28
ISSN 2050-7488
2050-7496
Keyword(s) Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
RECHARGEABLE LITHIUM BATTERIES
TUNGSTEN OXYNITRIDE
MOLYBDENUM NITRIDE
VANADIUM NITRIDE
ENERGY-STORAGE
NANOCRYSTALLINE VN
ELECTRODE MATERIAL
ANODE MATERIAL
ION BATTERIES
FUEL-CELLS
Summary A number of transition metal nitrides and oxynitrides, which are actively investigated today as electrode materials in a wide range of energy conversion and storage devices, possess an oxide layer on the surface. Upon exposure to ambient air, properties of this layer progressively change in the process known as "ageing". Since a number of electrochemical processes involve the surface or sub-surface layers of the active electrode compounds only, ageing could have a significant effect on the overall performance of energy conversion and storage devices. In this work, the influence of the ageing of tungsten and molybdenum oxynitrides on their electrochemical properties in supercapacitors is explored for the first time. Samples are synthesised by the temperature-programmed reduction in NH3 and are treated with different gases prior to exposure to air in order to evaluate the role of passivation in the ageing process. After the synthesis, products are subjected to controlled ageing and are characterised by low temperature nitrogen adsorption, X-ray photoelectron spectroscopy and transmission electron microscopy. Capacitive properties of the compounds are evaluated by performing cyclic voltammetry and galvanostatic charge and discharge measurements in the 1 M H2SO4 electrolyte. © 2014 the Partner Organisations.
Language eng
DOI 10.1039/c4ta00220b
Field of Research 100708 Nanomaterials
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30071665

Document type: Journal Article
Collection: Institute for Frontier Materials
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