Spherical porous VN and NiOx as electrode materials for asymmetric supercapacitor

Zhao-Hui, Gao; Zhang, Hao; Cao, Guangming; Han, Min−Koo; Yang, Yusheng

doi:10.1016/j.electacta.2012.09.075

Cited by 74 publications

(38 citation statements)

References 23 publications

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“…Mostly utilized anode materials i.e. activated carbons have high hydrogen evolution potential leading to large negative potential range with low average capacitance resulting in imbalanced synergism [13]. Moreover, AC has limited accessibility of hydrated ions to the pores smaller than 0.5 nm (lesser than hydrated ions) retarding their relaxation time constant [14,15].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of Asymmetric Supercapacitor based on Cobalt manganite modified graphene nanoribbons

Ahuja

Sahu

Ujjain

et al. 2014

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of Asymmetric Supercapacitor based on Cobalt manganite modified graphene nanoribbons

Ahuja

Sahu

Ujjain

et al. 2014

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%

“…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][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][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).…”

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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“…S10c) and state-of-the-art reported PHMSs and other asymmetric MSs, e.g., CNT//MnO 2 /CNT (74.7% after 10000 cycles), 32 graphene-FeOOH//graphene-MnO 2 (84% after 2000 cycles), 12 graphene quantum dots//MnO 2 (80% after 3000 cycles), 46 graphene quantum dots//polyaniline (85% after 1500 cycles), 45 and most reported sandwich ASCs, such as VN//Co(OH) 2 (86% after 4000 cycles), 15 Co(OH) 2 /graphene foam//graphene/ Fe 3 O 4 @carbon (72% after 8000 cycles), 47 and VN/NiOx (85% after 1000 cycles). 48 In addition, our mask-assisted manufacturing strategy is highly flexible for fabricating miniaturized VN//Co (OH) 2 -PHMSs with tailored device size and geometries (Fig. S12).…”

Section: Nanoflowersmentioning

confidence: 99%

All-solid-state high-energy planar hybrid micro-supercapacitors based on 2D VN nanosheets and Co(OH)2 nanoflowers

Wang

Zhou

et al. 2018

npj 2D Mater Appl

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Planar micro-supercapacitors are recognized as one of the most competitive on-chip power sources for integrated electronics. However, most reported symmetric micro-supercapacitors suffer from low energy density. Herein, we demonstrate the facile maskassisted fabrication of new-type all-solid-state planar hybrid micro-supercapacitors with high energy density, based on interdigital patterned films of porous vanadium nitride nanosheets as negative electrode and Co(OH) 2 nanoflowers as positive electrode. The resultant planar hybrid micro-supercapacitors display high areal capacitance of 21 mF cm −2 and volumetric capacitance of 39.7 F cm −3 at 0.2 mA cm −2 , and exhibit remarkable energy density of 12.4 mWh cm −3 and power density of 1750 mW cm −3 , based on the whole device, outperforming most reported planar hybrid micro-supercapacitors and planar asymmetric micro-supercapacitors. Moreover, all-solid-state planar hybrid micro-supercapacitors show excellent cyclability with 84% capacitance retention after 10000 cycles, and exceptionally mechanical flexibility. Therefore, our proposed strategy for the simplified construction of planar hybrid micro-supercapacitors will offer numerous opportunities of utilizing graphene and other 2D nanosheets for high-energy microscale supercapacitors for electronics.

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Spherical porous VN and NiOx as electrode materials for asymmetric supercapacitor

Cited by 74 publications

References 23 publications

Performance evaluation of Asymmetric Supercapacitor based on Cobalt manganite modified graphene nanoribbons

Performance evaluation of Asymmetric Supercapacitor based on Cobalt manganite modified graphene nanoribbons

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

All-solid-state high-energy planar hybrid micro-supercapacitors based on 2D VN nanosheets and Co(OH)2 nanoflowers

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