Nanostructured mixed transition metal oxide spinels for supercapacitor applications

Deka, Sasanka

doi:10.1039/d2dt02733j

Cited by 98 publications

(17 citation statements)

References 186 publications

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“…[71] The calculated R ct value for Nyquist circuit is low in case of LiOH than other two electrolytes, that is, NaOH and KOH, which confirms the fast charge transfer rate. [48,72] The details of electrolyte diffusion and ionic diffusion at interior sites of active material are estimated via Warburg resistance (low-frequency region). The overall internal resistance parameters are declined, which offer higher mobility of ions and hence enhanced electrochemical behavior of CoNi nanoflowers in LiOH electrolyte.…”

Section: Electrochemical Studies and Effect In Different Electrolyte ...mentioning

confidence: 99%

Insights on Effect of Different Electrolytes on Electrochemical Performance of CoNi Nanoflower‐Based Supercapacitors

2023

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Bimetallic materials show superior properties over monometallic systems due to their synergistic effect. Herein, bimetallic CoNi nanoflowers are synthesized by a simple method and characterized via various characterization techniques such as powder X‐ray diffraction (PXRD), scanning electron microscopy, high‐resolution transmission electron microscopy, X‐ray photoelectron spectroscopy, etc. PXRD results confirm the formation of face‐centered cubic CoNi nanoflowers and morphological studies confirm the flower‐like structure of CoNi. Bimetallic CoNi nanoflowers utilized for supercapacitor applications and the effect of electrolyte cations (K+, Na+, Li+) are studied. The results reveal that LiOH shows excellent capacitance of 729.52 F g−1 (66.83 mAh g−1) at 1 A g−1. The cyclic stability of CoNi nanoflower is estimated as ≈100% after 10 000 cycles which signifies the exceptional long‐term utility of the electrode for practical application. Further, the asymmetric device is fabricated which shows the capacitance of 66.61 F g−1 and the commercial light‐emitting diode (1.8 V) delivers high energy density and power density, that is, 18.13 Wh kg−1 at 699.84 W kg−1. The nanoflower exhibits battery–supercapacitor‐type behavior with rapid charge/discharge capability with a binder‐free and additive‐free approach.

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Section: Electrochemical Studies and Effect In Different Electrolyte ...mentioning

confidence: 99%

Insights on Effect of Different Electrolytes on Electrochemical Performance of CoNi Nanoflower‐Based Supercapacitors

2023

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“…Due to the rapid exhaustion of fossil fuels and their adverse impact on the global environment, there is an immense need to develop innovative energy resources and novel procedures associated with energy conversion and storage systems . Among several such perceptive systems, supercapacitors with all-solid-state architecture are considered exceptionally important due to their ultimate power delivery output, extended durability, high operational safety, and easy transportability. , Consequently, supercapacitors have progressed as the most contemporary energy storage systems, which are being rationalized to support technological revolutions . The supercapacitors face the limitation of low charge storage and Ragone efficiency due to the limited number of accessible active sites and high charge transfer resistance of the electrode materials, and considerable diffusion resistance of electroactive ions, during the charge storage process in the devices.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Uniform 2D Porous Sheet-like NiO/NiCo₂O₄: A High-Performance Positrode Material for All-Solid-State Hybrid Pseudocapacitors with Superior Ragone and Cyclic Efficiencies

Srivastav,

Lamba,

Paliwal

et al. 2024

J. Phys. Chem. C

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As electrochemical energy storage devices with superior Ragone and cyclic efficiencies are vital for numerous modern-day technologies, herein, a kinetically controlled crystal growth strategy has been innovated to design a very uniform 2D porous sheet-like NiO/NiCo 2 O 4 positrode material of very high surface area (235 m 2 g −1 ) for the fabrication of a high-performance hybrid pseudocapacitor of all-solid-state architecture. The electrochemical investigation of NiO/NiCo 2 O 4 in a three-electrode setup demonstrates the physiognomies such as rich redox reversibility, >95% diffusion-controlled charge storage, high rate charge storage efficiency, negligible iR drop, insignificant charge transfer, and series resistance of 0.45 and 1.21 Ω, respectively, and typical Warburg response indicative of facilitated diffusion of the electrolyte ions during the charge storage process, which illustrates the material's archetypal suitability as an excellent positrode material for application in high-performance pseudocapacitors. The fabricated NiO/NiCo 2 O 4 ||N-rGO all-solid-state hybrid pseudocapacitor (ASSHPC) device with PVA-KOH and N-rGO as the solid-gel separator electrolyte and negatrode material, respectively, demonstrates the physiognomies such as hybrid (semi-infinite diffusion and surface controlled) charge storage, imperceptible iR drop even under high applied current density conditions, superior rate specific capacity/capacitance, extremely low charge transfer, and series resistance of 0.3 and 1.0 Ω, respectively, very low relaxation time constant of ∼0.69 s, excellent Ragone efficiency (energy densities of 38 and 25 Wh kg −1 at power densities of 2346 and 10,976 W kg −1 , respectively), and 98.4% retention in area specific capacity over 12,500 charge−discharge cycles. It is found that the multiple oxidation states of the Ni and Co ions in NiO/NiCo 2 O 4 and the archetypical bulk porosity in its microstructure offer physicoelectrochemical compatibility with N-rGO, which facilitates lowly resisted electrolyte ion diffusion, increased redox-active sites, and shortened diffusion path length of the electroactive ions during the charge storage process in the high-performance ASSHPC device. The optimized approach in the study will boost the advancement of positrode material systems to develop extremely Ragone and cyclic efficient pseudocapacitor devices for integrations in prospective electronic architectures.

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“…[11] Similarly, the multiple oxidation states of MTMOs provide more electroactive sites that can store a large number of charges and eventually enhance the electrochemical performance more than single TMOs. [12] Transition metal vanadate (MxVyOz, M=Bi, Zn, Ni, Fe) is an important class of MTMOs that have a widespread application in photocatalysis, Li-ion batteries, and SCs. [13,14] Various vanadium-based electrodes like cobalt vanadate, zinc vanadate, and nickel vanadate are explored in SCs due to their layered structure, wide oxidation states, and synergistic effect between vanadium and the transition metal.…”

Section: Introductionmentioning

confidence: 99%

“…In MTMOs, the coupling of two metal species with two different metal cations, in a single crystal structure involves effective redox reactions [11] . Similarly, the multiple oxidation states of MTMOs provide more electroactive sites that can store a large number of charges and eventually enhance the electrochemical performance more than single TMOs [12] . Transition metal vanadate (MxVyOz, M=Bi, Zn, Ni, Fe) is an important class of MTMOs that have a widespread application in photocatalysis, Li–ion batteries, and SCs [13,14] .…”

Section: Introductionmentioning

confidence: 99%

Green and Facile Synthesis of Zn₃V₂O₈−Ag@C Composite as an Efficient Electrode for Supercapacitor Application

Mane,

Bhoj,

Moholkar

et al. 2024

ChemistrySelect

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The present study demonstrates the synthesis of ternary composites of zinc vanadate (Zn3V2O8) with silver (Ag) and carbon matrix originated from the Bengal gram bean extract (BGBE) using a facile, economic, and environmentally sustainable rotational chemical bath deposition (R−CBD) method. From the electrochemical studies, it is found that the Zn3V2O8−Ag@C demonstrated improved electrochemical performance with the specific capacitance (Csp) of 380.1 F g−1, energy density (ED) of 52.7 Wh kg−1, with power density (PD) of 882.3 W kg−1 at 3 mA cm−2 current density and good capacitive retention of 89.8 % over 3000 charge–discharge (GCD) cycles, which is remarkably higher than the other electrode materials (Zn3V2O8, Zn3V2O8−Ag, Zn3V2O8@C). The combined merits of conductive silver (Ag) nanoparticle and carbonaceous material from BGBE assist in enhancing the overall electrochemical performance of Zn3V2O8−Ag@C. The Zn3V2O8−Ag@C nanocomposite was used as electrode material for the fabrication of a flexible symmetric solid–state supercapacitor device (SSC). The SSC device delivered a Csp of 69.17 F g−1 with an energy density (ED) of 13.8 Wh kg−1 at a 2 mA cm−2 current density. Moreover, the SSC shows a 90 % capacitive retention over the continuous GCD cycles.

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Nanostructured mixed transition metal oxide spinels for supercapacitor applications

Abstract: There have been numerous applications of supercapacitors in day-to-day life. Along with batteries and fuel cells, supercapacitors play an essential role in supplementary electrochemical energy storage technologies. They are used...

Cited by 98 publications

References 186 publications

Insights on Effect of Different Electrolytes on Electrochemical Performance of CoNi Nanoflower‐Based Supercapacitors

Insights on Effect of Different Electrolytes on Electrochemical Performance of CoNi Nanoflower‐Based Supercapacitors

Hierarchically Uniform 2D Porous Sheet-like NiO/NiCo₂O₄: A High-Performance Positrode Material for All-Solid-State Hybrid Pseudocapacitors with Superior Ragone and Cyclic Efficiencies

Green and Facile Synthesis of Zn₃V₂O₈−Ag@C Composite as an Efficient Electrode for Supercapacitor Application

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Nanostructured mixed transition metal oxide spinels for supercapacitor applications

Abstract: There have been numerous applications of supercapacitors in day-to-day life. Along with batteries and fuel cells, supercapacitors play an essential role in supplementary electrochemical energy storage technologies. They are used...

Cited by 98 publications

References 186 publications

Insights on Effect of Different Electrolytes on Electrochemical Performance of CoNi Nanoflower‐Based Supercapacitors

Insights on Effect of Different Electrolytes on Electrochemical Performance of CoNi Nanoflower‐Based Supercapacitors

Hierarchically Uniform 2D Porous Sheet-like NiO/NiCo2O4: A High-Performance Positrode Material for All-Solid-State Hybrid Pseudocapacitors with Superior Ragone and Cyclic Efficiencies

Green and Facile Synthesis of Zn3V2O8−Ag@C Composite as an Efficient Electrode for Supercapacitor Application

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Product

Resources

About

Hierarchically Uniform 2D Porous Sheet-like NiO/NiCo₂O₄: A High-Performance Positrode Material for All-Solid-State Hybrid Pseudocapacitors with Superior Ragone and Cyclic Efficiencies

Green and Facile Synthesis of Zn₃V₂O₈−Ag@C Composite as an Efficient Electrode for Supercapacitor Application