Synthesis and characterization of Nb-doped strontium cobaltite@GQD electrodes for high performance supercapacitors

Kharangarh, Poonam R.; Ravindra, Nuggehalli M.; Singh, Gurmeet; Umapathy, Siva

doi:10.1016/j.est.2022.105388

Cited by 27 publications

(10 citation statements)

References 62 publications

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“…30 The ternary hybrid retains all the characteristic peaks of STO and PANI substantiating the formation of the hybrid. However, the inherent peak of GQD corresponding to the (002) plane expected around 26.31 31,43 was not clearly visible. It may be assumed that the characteristic peak of GQD is masked by the broad peak of PANI or it may be the consequence of the low loading of GQD and its fine dispersion in the STO matrix.…”

Section: Resultsmentioning

confidence: 90%

“…The G band represents the E 2g vibrational mode of sp 2 carbon atoms in the graphene lattice. 12,22,31 Successful integration of GQD in SG was established by the presence of bands at 1587 cm À1 and 1365 cm À1 , respectively, reflecting its graphene-like nature. SGP also retains the bands at 1589 cm À1 and 1370 cm À1 revealing successful formation of the hybrid.…”

Section: Resultsmentioning

confidence: 99%

“…This GO wasthen utilized to create graphene quantum dots (GQD) via a top-down approach. 31 In this process, a solution of GO in deionized water (0.02 mg GO in 20 mL water) was combined with hydrogen peroxide (H 2 O 2 ) (5 mL, 30% concentration).…”

Section: Preparation Of Graphene Quantum Dots (Gqd)mentioning

confidence: 99%

“…One of the important approaches for enhancing the electrochemical performance of perovskites is to integrate them with an electrically conducting matrix, such as conducting polymers or carbon materials, to enhance the structural stability and conductivity. 7,21,[27][28][29][30][31] Reports on strontium titanate for supercapacitor applications are rather limited. [27][28][29][30]32 Recently we have reported a STO : PANI binary composite for supercapacitor applications.…”

Section: Introductionmentioning

confidence: 99%

“…34,35 In this study, we have adopted a top-down synthesis method from graphite precursor to engineer GQD with comparatively better yield and structural control. 31 Unique structural characteristics of GQD 12,36,37 are reported to facilitate ion transport and diffusion, while excellent redox properties, high capacitance and low cost validate the choice of polyaniline as an integrating supercapacitor material. 33,[38][39][40][41][42] The polymeric backbone of PANI assists facile diffusion of ions and its redox characteristics and conductivity render it a highly explored material for supercapacitor applications.…”

Section: Introductionmentioning

confidence: 99%

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Polyaniline wrapped graphene quantum dot decorated strontium titanate for robust high-performance flexible symmetric supercapacitors

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Preparation Of Graphene Quantum Dots (Gqd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyaniline wrapped graphene quantum dot decorated strontium titanate for robust high-performance flexible symmetric supercapacitors

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et al. 2023

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Carbon quantum dots modified and Y³⁺ doped Ni₃(NO₃)₂(OH)₄ nanospheres with excellent battery‐like supercapacitor performance

Gao,

Xie,

Zuo

et al. 2024

Chemistry A European J

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Supercapacitor is an important energy storage device widely used in the automobile industry, military production, and communication equipment because of its fast charge‐discharge rate, and high power density. Herein, carbon quantum dots modified and Y3+ doped Ni3(NO3)2(OH)4 (NiY@CQDs) nanospheres are prepared by a solvothermal method and used as an electrode material. The electrochemical properties of NiY@CQDs were measured in a three‐electrode system. An asymmetric supercapacitor (ASC) cell was assembled with activated carbon (AC) as the anode and NiY@CQDs as the cathode. The electrochemical properties of the ASC device were measured in a two‐electrode system. Experimental results show the shape of NiY@CQDs is petal‐shaped and the introducing carbon quantum dots and doping Y3+ significantly increases the specific surface area, conductivity, and specific capacitance of Ni3(NO3)2(OH)4. The mass‐specific capacitance of NiY@CQDs reaches up to 2944 F·g‐1 at a current density of 1 A·g‐1. The asymmetric supercapacitor of NiY@CQDs//AC has a high energy density of 138.65 Wh·kg−1 at a power density of 1500 W·kg−1, displaying a wide range of application prospects in the energy storage area.

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Green Chemistry Approach for One‐Step Synthesis of Iodinated Graphene Material for Supercapacitor Applications

Kalicharan,

Pitchaimani,

Barath Kanna

et al. 2024

ChemistrySelect

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Iodinated graphene is a promising 2D material with unique physical and chemical characteristics. A new synthesis method that combines iodine intercalation and surface reduction of graphite sheets in a single step was developed. This method uses NaIO4 and m‐CPBA to efficiently incorporate iodine and selectively remove oxygen from the graphene network at room temperature. The presence of iodine moieties in the graphene network was confirmed using various techniques such as XPS photoelectron spectroscopy, HR‐TEM, XRD, FT‐IR, TGA, and Raman spectroscopy. The high iodine content of the material enhanced the d‐spacing and ion mobility of the electrolyte, thereby improving the storage capacity. In addition, the potential of iodinated graphene as an electrode material was investigated through EIS, CV, and GCD using 1 M H2SO4 solution as the electrolyte. The iodinated graphene material exhibited EDL capacitance and demonstrated an impressive specific capacitance of 535.4 F g−1 at a high rate, with a current density of 1 A g−1. Moreover, it exhibited exceptional stability over 5000 cycles. These halogenated graphene derivatives are attractive options for use in supercapacitors.

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Synthesis and characterization of Nb-doped strontium cobaltite@GQD electrodes for high performance supercapacitors

Cited by 27 publications

References 62 publications

Polyaniline wrapped graphene quantum dot decorated strontium titanate for robust high-performance flexible symmetric supercapacitors

Polyaniline wrapped graphene quantum dot decorated strontium titanate for robust high-performance flexible symmetric supercapacitors

Carbon quantum dots modified and Y³⁺ doped Ni₃(NO₃)₂(OH)₄ nanospheres with excellent battery‐like supercapacitor performance

Green Chemistry Approach for One‐Step Synthesis of Iodinated Graphene Material for Supercapacitor Applications

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Synthesis and characterization of Nb-doped strontium cobaltite@GQD electrodes for high performance supercapacitors

Cited by 27 publications

References 62 publications

Polyaniline wrapped graphene quantum dot decorated strontium titanate for robust high-performance flexible symmetric supercapacitors

Polyaniline wrapped graphene quantum dot decorated strontium titanate for robust high-performance flexible symmetric supercapacitors

Carbon quantum dots modified and Y3+ doped Ni3(NO3)2(OH)4 nanospheres with excellent battery‐like supercapacitor performance

Green Chemistry Approach for One‐Step Synthesis of Iodinated Graphene Material for Supercapacitor Applications

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Product

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Carbon quantum dots modified and Y³⁺ doped Ni₃(NO₃)₂(OH)₄ nanospheres with excellent battery‐like supercapacitor performance