Pseudocapacitive storage via micropores in high-surface area molybdenum nitrides

Djire, Abdoulaye; Siegel, Jason B.; Ajenifujah, Olabode T.; He, Lilin; Thompson, Levi T.

doi:10.1016/j.nanoen.2018.06.045

Cited by 43 publications

(30 citation statements)

References 43 publications

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“…Table summarizes the physical and electrochemical properties of VN in aqueous electrolytes. The surface area obtained for the synthesized material is similar to those reported in the literature . The areal specific capacitances, normalized by the surface area (obtained from N 2 physisorption) were estimated by integrating the area under the voltammograms and dividing by the nitride mass loading .…”

Section: Resultssupporting

confidence: 61%

“…The surface area obtained for the synthesized material is similar to those reported in the literature. [11][12][13][14][15][16][17] The areal specific capacitances, normalized by the surface area (obtained from N 2 physisorption) were estimated by integrating the area under the voltammograms and dividing by the nitride mass loading. [13] The voltage window (shown in Table 1) is taken as the width of the voltammogram.…”

Section: Performance Evaluationmentioning

confidence: 99%

“…The nitride materials can be produced with desirable properties including; highly accessible surface area, high electric conductivity and at low cost . They possess high capacitance, good capacitance retention during cycling and exhibit wide voltage windows . For example, the capacitance for vanadium nitride (VN) has been reported to be as high as 1340 Fg −1 in aqueous alkaline electrolyte .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] They possess high capacitance, good capacitance retention during cycling and exhibit wide voltage windows. [11][12][13][14][15][16] For example, the capacitance for vanadium nitride (VN) has been reported to be as high as 1340 Fg À1 in aqueous alkaline electrolyte. [12] The origin of this high capacitance was attributed to a combination of electric double-layer formation and faradaic redox reactions occurring on the nitride or oxynitride (VN x O y ) surface.…”

Section: Introductionmentioning

confidence: 99%

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Extent of Pseudocapacitance in High‐Surface Area Vanadium Nitrides

Djire

Ajenifujah

Thompson

2018

Batteries & Supercaps

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Early transition‐metal nitrides, especially vanadium nitride (VN), have shown promise for use in high energy density supercapacitors due to their high electronic conductivity, areal specific capacitance, and ability to be synthesized in high surface area form. Their further development would benefit from an understanding of their pseudocapacitive charge storage mechanism. In this paper, the extent of pseudocapacitance exhibited by vanadium nitride in aqueous electrolytes was investigated using cyclic voltammetry and electrochemical impedance spectroscopy. The pseudocapacitance contribution to the total capacitance in the nitride material was much higher than the double‐layer capacitance and ranged from 85 % in basic electrolyte to 87 % in acidic electrolyte. The mole of electrons transferred per VN material during pseudocapacitive charge storage was also evaluated. This pseudocapacitive charge‐storage is the key component in the full utilization of the properties of early‐transition metal nitrides for high‐energy density supercapacitors.

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Section: Resultssupporting

confidence: 61%

Section: Performance Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Extent of Pseudocapacitance in High‐Surface Area Vanadium Nitrides

Djire

Ajenifujah

Thompson

2018

Batteries & Supercaps

Self Cite

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“…[31] Several classes of materials and their composites have been explored to enhance SC device performance. [36][37][38][39][40][41] pseudocapacitive mechanism is mainly exhibited by MOs, [42][43][44] MNs, [45][46][47] MSs, [48][49][50][51] CPs, [52,53] and MONs. [1,19] Based on the metal present in the oxynitride material, its charge storage mechanism exhibits either EDLC or pseudocapacitive behaviour.…”

Section: Introductionmentioning

confidence: 99%

Metal Oxynitrides as Promising Electrode Materials for Supercapacitor Applications

2019

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In the past decade, due to the demands of the electrochemical energy storage sector, there has been a quest for novel supercapacitor materials that offer champion storage characteristics. Metal oxynitrides are seen as potential candidates for electrochemical energy storage owing to their high cyclability (up to 10 5 cycles), good intrinsic conductivity (30000-35000 S cm À 1 ), good wettability, corrosion resistance, and chemical inertness. In this review, the use of metal oxynitrides as electrode materials for supercapacitors is discussed. A comparison of oxynitrides with other electrode materials, such as metal oxides, carbon-based materials, and their composites, is made. This study also places emphasis on the impact of synthesis techniques on the final properties of the material. In view of this critical analysis, we envisage future directions for this category of energy storage materials.[a] U.

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Well Controlled 3D Iridium Oxide/Platinum Nanocomposites with Greatly Enhanced Electrochemical Performances

Zeng

Xia

Zhang

et al. 2019

Adv Materials Inter

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It is crucial to improve charge storage capacity (CSC) and charge transport efficiency with low impedance for electrochemical capacitors. Here, a well‐controlled three‐dimensional (3D) nanocrystal platinum (Pt) is electrodeposited as the intermediate layer on microelectrode (200 µm in diameter) to provide extensive large surface area, followed by introducing iridium oxide (IrOx) nanoparticles with excellent adhesion on the rough layer to fabricate high‐performance IrOx/Pt composite coatings. The uniform flower‐shaped coating presents a significantly low impedance ≈2.01 kΩ at 1 kHz (reduction of 94.52%). It has a cathodic CSC (CSCc) up to ≈200.64 mC cm−2, about 2, 17.51, and 56.18 times higher than that of nanocrystal Pt, IrOx, and flat Pt respectively. Robust chronic stability is observed with CSCc at ≈171.97 mC cm−2 after electrical stimulation for 12 d (>1 × 108 cycles). It also demonstrates record‐high charge injection capacity ≈6.37 mC cm−2 with excellent biocompatibility. Such coating is widely applicable for batch production on multichannel microelectrode arrays or substrates with different sizes. Moreover, it promotes excellent sensitivity to glucose detection up to ≈130 µA cm−2 mm−1, with a linear range of 1–30 × 10−3 m and a detection limit of 1.08 × 10−6 m. The promising coating will pave a new way for various electrochemical applications.

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Pseudocapacitive storage via micropores in high-surface area molybdenum nitrides

Cited by 43 publications

References 43 publications

Extent of Pseudocapacitance in High‐Surface Area Vanadium Nitrides

Extent of Pseudocapacitance in High‐Surface Area Vanadium Nitrides

Metal Oxynitrides as Promising Electrode Materials for Supercapacitor Applications

Well Controlled 3D Iridium Oxide/Platinum Nanocomposites with Greatly Enhanced Electrochemical Performances

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