Determination of Quantum Capacitance of Niobium Nitrides Nb2N and Nb4N3 for Supercapacitor Applications

Bharti,; Ahmed, Gulzar; Kumar, Yogesh; Bocchetta, Patrizia; Sharma, Shatendra

doi:10.3390/jcs5030085

Cited by 11 publications

(5 citation statements)

References 63 publications

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“… 104 The maximum C Q has been observed for Nb 2 N (1196.28 μF/cm 2 at −1 V and 844.8 μF/cm 2 at 0.5 V) and Nb 4 N 3 (174.86 μF/cm 2 ). 105 Remarkably, increasing the number of layers has profound effects on enhanced C Q for both Nb 2 N and Nb 4 N 3 .…”

Section: Mxenementioning

confidence: 97%

“…We highlight that simulated C Q of NbN at negative and positive biases is found to be 834.5 and 1683.7 F/g compared to Nb 4 N and Nb 5 N 6 . The maximum C Q has been observed for Nb 2 N (1196.28 μF/cm 2 at −1 V and 844.8 μF/cm 2 at 0.5 V) and Nb 4 N 3 (174.86 μF/cm 2 ) . Remarkably, increasing the number of layers has profound effects on enhanced C Q for both Nb 2 N and Nb 4 N 3 .…”

Section: Mxenementioning

confidence: 99%

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Quantum Capacitance of Two-Dimensional-Material-Based Supercapacitor Electrodes

Ghosh,

Behera,

Mishra

et al. 2023

Energy Fuels

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Electrochemical energy storage technology has emerged as one of the most viable solutions to tackle the challenge of fossil-fuel-based technology and associated global pollution. Supercapacitors are widely used for high-power applications, and there is tremendous ongoing effort to make them useful for high-energy storage applications. While electrode materials of supercapacitors play a central role in charge storage performance, insights into the contribution from different charge storage mechanisms are crucial from both fundamental and applied aspects. In this context, apart from the electric double layer and fast redox reaction at/near the surface, another pronounced contribution from the electrode is quantum capacitance (C Q). Here, the origin of C Q, how it contributes to the total capacitance, the possible strategies to improve it, and the state-of-art C Q of electrode materials, including carbon, two-dimensional materials, and their composites, are discussed. Although most of the studies on quantifying C Q are theoretical, some case studies on experimental measurements using standard electrochemical techniques are summarized. With an overview and critical analysis of theoretical studies on quantum capacitance of electrode materials, this review critically examines the supercapacitor design strategies, including choosing the right materials and electrolytes. These insights are also relevant to other types of clean energy storage technologies, including metal-ion capacitors and batteries.

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Section: Mxenementioning

confidence: 97%

Section: Mxenementioning

confidence: 99%

Quantum Capacitance of Two-Dimensional-Material-Based Supercapacitor Electrodes

Ghosh,

Behera,

Mishra

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…It has been demonstrated that cobalt doping can increase the capacitance of niobium nitride. Bharti et al calculated the C Q of Nb 2 N and Nb 4 N 3 and investigated the effect of Co-doping on their C Q [ 128 ]. Their calculations show that the C Q value of Nb 2 N is remarkably high (1196.28 μF/cm 2 , −1 V) and the C Q of Nb 4 N 3 is much lower than that of Nb 2 N. When they increased the number of layers of Nb 2 N and Nb 4 N 3 , they found that the C Q kept increasing with the more layer numbers.…”

Section: Research Progress Of 2d Electrode Materials For Edlcsmentioning

confidence: 99%

Theoretical Studies on the Quantum Capacitance of Two-Dimensional Electrode Materials for Supercapacitors

et al. 2023

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In recent years, supercapacitors have been widely used in the fields of energy, transportation, and industry. Among them, electrical double-layer capacitors (EDLCs) have attracted attention because of their dramatically high power density. With the rapid development of computational methods, theoretical studies on the physical and chemical properties of electrode materials have provided important support for the preparation of EDLCs with higher performance. Besides the widely studied double-layer capacitance (CD), quantum capacitance (CQ), which has long been ignored, is another important factor to improve the total capacitance (CT) of an electrode. In this paper, we survey the recent theoretical progress on the CQ of two-dimensional (2D) electrode materials in EDLCs and classify the electrode materials mainly into graphene-like 2D main group elements and compounds, transition metal carbides/nitrides (MXenes), and transition metal dichalcogenides (TMDs). In addition, we summarize the influence of different modification routes (including doping, metal-adsorption, vacancy, and surface functionalization) on the CQ characteristics in the voltage range of ±0.6 V. Finally, we discuss the current difficulties in the theoretical study of supercapacitor electrode materials and provide our outlook on the future development of EDLCs in the field of energy storage.

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“…Hence, materials with high quantum capacitance are more suitable for fabrication of supercapacitors. So, it becomes important to calculate and study the QC of the materials suggested for supercapacitor applications [9][10][11]. Researchers have tried modifying graphene structure by doping or functionalization [12] to increase its QC value but still the specific capacitance of graphene electrodes is not very high.…”

Section: = + [1]mentioning

confidence: 99%

Study of Quantum Capacitance of Pure and Functionalized Nb₂c and Ti₂c Mxenes for Supercapacitor Applications

et al. 2022

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Supercapacitors in combination with renewable energy sources can provide environment friendly and sustainable energy devices. But due to their lower energy density, they are not able to replace batteries for all commercial applications. Their energy density can be increased by using high quantum capacitance electrodes. MXenes have potential to be used for such electrodes. In present work, density of states, band structure and quantum capacitance (QC) of bare and functionalized niobium carbide and titanium carbide MXenes are studied using DFT simulations. The calculated quantum capacitances of Nb2C and Ti2C show significant values of 324.1 and 246.2 µF/cm2 respectively. Nb2C shows higher value for QC in comparison to Ti2C for both positive as well as negative electrodes. These calculations are also performed for functionalized MXenes using =O, -F and –OH as functional group. Functionalization of MXenes with these groups reduces the QC of Nb2C and Ti2C MXenes at Fermi level.

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Determination of Quantum Capacitance of Niobium Nitrides Nb2N and Nb4N3 for Supercapacitor Applications

Cited by 11 publications

References 63 publications

Quantum Capacitance of Two-Dimensional-Material-Based Supercapacitor Electrodes

Quantum Capacitance of Two-Dimensional-Material-Based Supercapacitor Electrodes

Theoretical Studies on the Quantum Capacitance of Two-Dimensional Electrode Materials for Supercapacitors

Study of Quantum Capacitance of Pure and Functionalized Nb₂c and Ti₂c Mxenes for Supercapacitor Applications

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Determination of Quantum Capacitance of Niobium Nitrides Nb2N and Nb4N3 for Supercapacitor Applications

Cited by 11 publications

References 63 publications

Quantum Capacitance of Two-Dimensional-Material-Based Supercapacitor Electrodes

Quantum Capacitance of Two-Dimensional-Material-Based Supercapacitor Electrodes

Theoretical Studies on the Quantum Capacitance of Two-Dimensional Electrode Materials for Supercapacitors

Study of Quantum Capacitance of Pure and Functionalized Nb2c and Ti2c Mxenes for Supercapacitor Applications

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Study of Quantum Capacitance of Pure and Functionalized Nb₂c and Ti₂c Mxenes for Supercapacitor Applications