Evolution of the electrochemical capacitance of transition metal oxynitrides with time: the effect of ageing and passivation
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journal contribution
posted on 2014-08-28, 00:00 authored by Olga Kartachova, Y Chen, R Jones, Ying (Ian) ChenYing (Ian) Chen, H Zhang, Alexey GlushenkovA 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.
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Journal
Journal of materials chemistry AVolume
2Issue
32Pagination
12940 - 12951Publisher
Royal Society of ChemistryLocation
London, Eng.Publisher DOI
Link to full text
ISSN
2050-7488eISSN
2050-7496Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, Royal Society of ChemistryUsage metrics
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Science & TechnologyPhysical SciencesTechnologyChemistry, PhysicalEnergy & FuelsMaterials Science, MultidisciplinaryChemistryMaterials ScienceRECHARGEABLE LITHIUM BATTERIESTUNGSTEN OXYNITRIDEMOLYBDENUM NITRIDEVANADIUM NITRIDEENERGY-STORAGENANOCRYSTALLINE VNELECTRODE MATERIALANODE MATERIALION BATTERIESFUEL-CELLS
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