Scalable nanohybrids of graphitic carbon nitride and layered NiCo hydroxide for high supercapacitive performance

traditional battery systems. [10,11] Practically, lower energy density bounds the applicability of supercapacitors over battery systems, leaving more room in developing high energy density supercapacitors without having to compromise the power competence. [12-14] A well-known approach offering such outstanding energy density is via fabrication of asymmetric supercapacitor device that focusses on the positive materials excellency exhibiting high specific capacitance and providing a broad potential window when combined with a double-layer type negative electrode material. [15-17] Co 3 O 4 , a pseudocapacitive metal oxide, belonging to the family of spinel is a promising positive active material in electrochemical energy storage devices owing to its high specific capacitance (3560 F g −1) theoretically with being earthabundant, cost-effective, and also environment friendly. [18-20] Pseudocapacitors follow faradaic redox electrochemical reactions on the material's surface through continuous intercalation/deintercalation of electrons or ions which makes the surface vulnerable to destruction resulting in lower efficiency of the electroactive material affecting the electrochemical cycles. [21-23] Therefore, much effort has been put forward to increase the efficiency and stability of the Co 3 O 4 structures through nanostructured, [18] heterostructured, [24,25] and core-shell type structures [26] to reduce the structural deterioration from Co 3 O 4 and increase the overall specific capacitances. For instance, a 3D hierarchical structure of CoWO 4 /Co 3 O 4 was developed that exhibited significantly high specific capacitance of 1728 F g −1 at a current density of 1 A g −1 retaining about 85.9% specific capacitance after 5000 cycles. [27] Paliwal and Meher design a heterostructure of Co 3 O 4 /NiCo 2 O 4 perforated nanosheets that delivers specific capacitance of 1767 F g −1 at a current density of 0.5 A g −1 maintaining 552 F g −1 capacitance at high current density 16 A g −1. Additionally, the asymmetric device composed of Co 3 O 4 /NiCo 2 O 4 ||N-rGO retains 93.8% areal capacitance after 10 000 operating cycles. [28] An excellent core-shell type CoO@Co 3 O 4 nanocrystals were grown solvothermally which delivered 3377 F g −1 specific capacitance at current density 2 A g −1 and the capacity retention was about 58.6% after 4000 charge-discharge cycles. [29] Lu et al. reported Co 3 O 4 /CoS core-shell nanosheets grown over Ni-foam by room temperature sulfurization process. The structure showed an improved specific capacitance as high as 1658 F g −1 at 1 A g −1 Designing of multicomponent transition metal oxide system through the employment of advanced atomic layer deposition (ALD) technique over nanostructures obtained from wet chemical process is a novel approach to construct rational supercapacitor electrodes. Following the strategy, core-shell type NiO/Co 3 O 4 nanocone array structures are architectured over Ni-foam (NF) substrate. The high-aspect-ratio Co 3 O 4 nanocones are hydrothermally grown over NF following the p...

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“…[ 3 ] : Ni 3 S 4 QDs; [ 52 ] Ref. [ 4 ] : g‐C 3 N 4 ‐NiCo‐LDH; [ 53 ] Ref. [ 5 ] : R‐Co 3 O 4 /CoS; [ 30 ] Ref.…”

Section: Resultsmentioning

confidence: 99%

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Adhikari

Seenivasan

et al. 2020

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“…Moreover, the Ragone plot clearly demonstrated the superior performance of the LDH@s-(GO/o-NH) supercapacitor electrode compared to those of various recently reported LDH-based supercapacitor electrodes. [57][58][59][60][61][62][63]…”

Section: Ni Ohmentioning

confidence: 99%

Ni‐Co layered double hydroxide coated on microsphere nanocomposite of graphene oxide and single‐walled carbon nanohorns as supercapacitor electrode material

Kim

Lee

et al. 2022

Intl J of Energy Research

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Summary Ni‐Co layered double hydroxides (LDH) have received considerable attention as excellent pseudocapacitor electrode materials. In this paper, a novel utilization of the composite of graphene oxide (GO) and single‐walled carbon nanohorns (SWCNHs) is reported as an effective substrate for LDH coatings. We successfully synthesized hierarchical nanostructures composed of Ni‐Co LDH as well as microsphere composites of GO and oxidized SWCNHs (o‐NH). A dense microsphere composite of GO and o‐NH was synthesized using the spray‐drying method (s‐(GO/o‐NH)). Subsequently, the prepared Ni‐Co LDH nanosheets were directly coated on the s‐(GO/o‐NH) microspheres using the hydrothermal method (LDH@s‐(GO/o‐NH)). Moreover, the electrochemical characteristics of the LDH@s‐(GO/o‐NH) supercapacitor electrodes were evaluated in a 6 M KOH electrolyte. In the three‐electrode system, the LDH@s‐(GO/o‐NH) composite electrode exhibited a significantly high gravimetric specific capacitance (1046 F g−1 at 1 mV s−1) and excellent specific capacitance retention (84% retention after 10 000 cycles at 100 mV s−1) compared with 211 F g−1 and 79% for the LDH@s‐GO composite electrode, respectively. The supercapacitive behavior of the LDH@s‐GO and LDH@s‐(GO/o‐NH) electrodes in the two‐electrode system exhibited a trend similar to that of the three‐electrode system. The superior electrochemical performance of the LDH@s‐(GO/o‐NH) composite electrode can be ascribed to its high electrical conductivity and pseudocapacitance, indicating that the s‐(GO/o‐NH) microsphere composite with an interconnected pore network structure can be utilized as a support for effectively coating Ni‐Co LDH components. The LDH@s‐(GO/o‐NH) composite electrode is a promising candidate for pseudocapacitor applications because of its excellent electrochemical characteristics and facile synthesis, making it suitable for industrial and consumer applications.

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“…18 LDHs can act as electrocatalysts and capacitors due to the higher current density and lower overpotential. 19,20 In addition, LDHs with tunable metal cation composition and facile exchange ability of interlaminar anions allows electronic structure tuning, making them a promising catalyst. 21,22 For example, Megala et al designed a NiAl-LDH/g-C 3 N 4 /Ag 3 PO 4 dual direct Z-scheme photocatalyst with enhanced catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Construction of NiCo-LDH/g-C₃N₄ heterojunctions as efficient photocatalysts for enhanced degradation of tetracycline hydrochloride and hydrogen evolution

Nong

Jin²,

Tan

et al. 2022

New J. Chem.

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Scalable nanohybrids of graphitic carbon nitride and layered NiCo hydroxide for high supercapacitive performance

Abstract: A two dimensional CNLDH 0.1 nanohybrid supercapacitor electrode prepared by simple hydrothermal hybridization of g-C3N4 and NiCO LDH shows the maximum specific capacity of 183.43 mA h g−1 with remarkable electrochemical performance.

Cited by 27 publications

References 53 publications

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Ni‐Co layered double hydroxide coated on microsphere nanocomposite of graphene oxide and single‐walled carbon nanohorns as supercapacitor electrode material

Construction of NiCo-LDH/g-C₃N₄ heterojunctions as efficient photocatalysts for enhanced degradation of tetracycline hydrochloride and hydrogen evolution

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Scalable nanohybrids of graphitic carbon nitride and layered NiCo hydroxide for high supercapacitive performance

Abstract: A two dimensional CNLDH 0.1 nanohybrid supercapacitor electrode prepared by simple hydrothermal hybridization of g-C3N4 and NiCO LDH shows the maximum specific capacity of 183.43 mA h g−1 with remarkable electrochemical performance.

Cited by 27 publications

References 53 publications

Encapsulation of Co3O4 Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Encapsulation of Co3O4 Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Ni‐Co layered double hydroxide coated on microsphere nanocomposite of graphene oxide and single‐walled carbon nanohorns as supercapacitor electrode material

Construction of NiCo-LDH/g-C3N4 heterojunctions as efficient photocatalysts for enhanced degradation of tetracycline hydrochloride and hydrogen evolution

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Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Construction of NiCo-LDH/g-C₃N₄ heterojunctions as efficient photocatalysts for enhanced degradation of tetracycline hydrochloride and hydrogen evolution