Charge storage on nanostructured early transition metal nitrides and carbides

Pande, Priyanka; Rasmussen, Paul G.; Thompson, Levi T.

doi:10.1016/j.jpowsour.2012.01.028

Cited by 89 publications

(65 citation statements)

References 18 publications

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“…The results demonstrate that the surface of the electrodes becomes progressively oxidized in 1 M H 2 SO 4 solution, while it remains similar to the surface of the initial electrode in 1 M KOH. These data are in agreement with observations by Pande et al [38], who reported good stability of VN and b-W 2 N in the KOH electrolyte.…”

Section: Resultssupporting

confidence: 93%

“…These values are significantly higher than 20e50 mF cm À2 expected for the EDLC mechanism [5,6]. Recently, similar observations have been made for b-W 2 N by Pande et al [38] and the contribution of a pseudocapacitive charge storage mechanism has been proposed. We therefore conclude that the charge storage mechanism of tungsten oxynitride does not only result from the formation of the electric double-layer, but additionally involves pseudocapacitive processes.…”

Section: Resultssupporting

confidence: 73%

See 1 more Smart Citation

Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

Kartachova

Glushenkov

Chen

et al. 2012

Journal of Power Sources

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 73%

Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

Kartachova

Glushenkov

Chen

et al. 2012

Journal of Power Sources

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“…Metal nitrides are another promising candidate for high performance supercapacitor electrode material due to their high melting point and superior electrical conductivity [25][26][27][28][29][30][31][32][33][34]. Among them, vanadium nitride (VN) has attracted considerable attention owing to high specific capacitance and good electrical conductivity (1.6 Â 10 6 V À1 m À1 ).…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Vanadium Nitride Nanofibers Fabricated by Electrospinning for Supercapacitors

Wang

Shen

et al. 2015

Electrochimica Acta

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“…Interestingly, they also showed that when coating VN with carbon, the electrode kept up to 88% of its initial capacitance after 15000 cycles in 1 M KOH. All these studies highlight the need of in-depth investigations of the suitable conditions for which VN is stable as an active material for energy storage applications.Most studies use VN powders prepared via ammonolysis of various vanadium oxides 40,42,44,45,48,49,53,60 or chloride. 37,58 As pointed out by Porto et al,46 this gives rise to two main drawbacks: (1) the use of different precursors especially oxides may lead to difference in compositions and especially oxygen content in the VN powders and (2) the use of powders imply the use of carbon and polymer additives in order to prepare composite electrodes, thus preventing the study of VN intrinsic electrochemical properties.…”

mentioning

confidence: 99%

Suitable Conditions for the Use of Vanadium Nitride as an Electrode for Electrochemical Capacitor

Morel

Borjon-Piron

Porto

et al. 2016

J. Electrochem. Soc.

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Vanadium nitride has displayed many interesting characteristics for its use as a pseudocapacitive electrode in an electrochemical capacitor, such as good electronic conductivity, good thermal stability, high density and high specific capacitance. Thin films of VN were prepared by D.C. reactive magnetron sputtering. The electrochemical stability of the films as well as the influence of dissolved oxygen in 1 M KOH electrolyte were investigated. In order to avoid material as well as electrolyte degradation, it was concluded that vanadium nitride should only be cycled between −0.4 and −1.0 V vs. Hg/HgO. After a 24 hours stabilization period, the prepared VN thin film showed an initial capacitance of 19 mF.cm −2 and a capacity retention of 96% after 10000 cycles. Furthermore, dissolved oxygen in the electrolyte was demonstrated to cause self-discharge up to a potential above −0.4 V vs. Hg/HgO, where VN was shown to be unstable. Additionally, the presence of oxygen was shown to shift the open circuit potential of a VN electrode to about 0 V through self-discharge processes. Electrochemical capacitors are currently being developed to complement other energy storage or conversion systems such as batteries and fuel cells. In the past two decades, several electrode materials have been investigated. The mostly studied materials include carbons, 1-8 conducting polymers 9-12 as well as pseudocapacitive 13 transition metal oxides such as ruthenium dioxide 14-18 and manganese dioxide. [19][20][21][22][23][24] In the effort to improve the performance of electrochemical capacitors, a widely used approach has been to develop synthetic methods to develop nanomaterials that are believed to lead to increased energy density and higher rate capability. 14,23,[25][26][27][28] Another approach has been to investigate the charge storage properties of novel materials. Accordingly, several research groups considered materials such as MXenes 29,30 and transition metal nitrides. [31][32][33][34][35][36][37] In the latter class of compounds, molybdenum nitride was firstly investigated 32,33,35,38,39 and in the past decade a great deal of attention has focused on other nitrides with an intensive focus on vanadium nitride 37,40-58 as a consequence of the impressive capacitance of 1340 F.g −1 reported for nanosized VN particles in 1 M KOH. 58 Indeed, VN is an interesting electrode material due to this high reported specific capacitance coupled with its close to metallic electronic conductivity (1.18 S.m −1 ), 59 high density (6.13 g.cm −3 ) and high melting point (2619 K). 59The hypothesis proposed by Choi et al.58 to explain such a high specific capacitance of VN, is that, in addition to electrochemical double layer capacitance, successive fast reversible redox reactions are taking place, involving surface oxide groups and OH − ions from the electrolyte. This hypothesis was supported by the observation of surface oxide via ex-situ XPS 58 and FTIR 41,58 post cycling measurements.While most studies concentrated on new synthesis of VN with the goa...

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Charge storage on nanostructured early transition metal nitrides and carbides

Cited by 89 publications

References 18 publications

Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

Electrochemical capacitance of mesoporous tungsten oxynitride in aqueous electrolytes

One-Dimensional Vanadium Nitride Nanofibers Fabricated by Electrospinning for Supercapacitors

Suitable Conditions for the Use of Vanadium Nitride as an Electrode for Electrochemical Capacitor

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