Hollow fibrous NiCo2O4 electrodes with controllable Zn substitution sites for supercapacitors

Gao, Kun; Li, Shu‐Dan

doi:10.1016/j.jallcom.2020.154927

Cited by 19 publications

(8 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…243 F/g (x = 0.3), 366 F/g (x = 0.5, max), 162 F/g (x = 0.7) [28] Ni1-xZnxCo2O4 (x = 0.5) -------2 1228 F/g [30] Ni1-xFexCo2O4 (x = 1) --------1…”

Section: Resultsmentioning

confidence: 99%

“…NiCo 2 O 4 is a spinel-type, AB 2 O 4 , binary metal oxide where nickel cations occupy octahedral sites and cobalt cations are randomly distributed on both tetrahedral and octahedral sites [26]. Doped NiCo 2 O 4 with various transition metals, e.g., Ni 1−x Ru x Co 2 O 4 [27], Ni 1−x Mn x Co 2 O 4 [28], Ni 1−x Cr x Co 2 O 4 [29], Ni 1−x Zn x Co 2 O 4 [30], Ni 1−x Fe x Co 2 O 4 [31], and Ni 1−x Ca x Co 2 O 4 [32], have been studied to understand the effect on morphology and their electrochemical performance. This paper describes a simple hydrothermal method for making Al 3+ doped NiCo 2 O 4, i.e., Ni 1−x Al x Co 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical Performance of Aluminum Doped Ni1−xAlxCo2O4 Hierarchical Nanostructure: Experimental and Theoretical Study

et al. 2021

View full text Add to dashboard Cite

For electrochemical supercapacitors, nickel cobaltite (NiCo2O4) has emerged as a new energy storage material. The electrocapacitive performance of metal oxides is significantly influenced by their morphology and electrical characteristics. The synthesis route can modulate the morphological structure, while their energy band gaps and defects can vary the electrical properties. In addition to modifying the energy band gap, doping can improve crystal stability and refine grain size, providing much-needed surface area for high specific capacitance. This study evaluates the electrochemical performance of aluminum-doped Ni1−xAlxCo2O4 (0 ≤ x ≤ 0.8) compounds. The Ni1−xAlxCo2O4 samples were synthesized through a hydrothermal method by varying the Al to Ni molar ratio. The physical, morphological, and electrochemical properties of Ni1−xAlxCo2O4 are observed to vary with Al3+ content. A morphological change from urchin-like spheres to nanoplate-like structures with a concomitant increase in the surface area, reaching up to 189 m2/g for x = 0.8, was observed with increasing Al3+ content in Ni1−xAlxCo2O4. The electrochemical performance of Ni1−xAlxCo2O4 as an electrode was assessed in a 3M KOH solution. The high specific capacitance of 512 F/g at a 2 mV/s scan rate, 268 F/g at a current density of 0.5 A/g, and energy density of 12.4 Wh/kg was observed for the x = 0.0 sample, which was reduced upon further Al3+ substitution. The as-synthesized Ni1−xAlxCo2O4 electrode exhibited a maximum energy density of 12.4 W h kg−1 with an outstanding high-power density of approximately 6316.6 W h kg−1 for x = 0.0 and an energy density of 8.7 W h kg−1 with an outstanding high-power density of approximately 6670.9 W h kg−1 for x = 0.6. The capacitance retention of 97% and 108.52% and the Coulombic efficiency of 100% and 99.24% were observed for x = 0.0 and x = 0.8, respectively. First-principles density functional theory (DFT) calculations show that the band-gap energy of Ni1−xAlxCo2O4 remained largely invariant with the Al3+ substitution for low Al3+ content. Although the capacitance performance is reduced upon Al3+ doping, overall, the Al3+ doped Ni1−xAlxCo2O4 displayed good energy, powder density, and retention performance. Thus, Al3+ could be a cost-effective alternative in replacing Ni with the performance trade off.

show abstract

“…243 F/g (x = 0.3), 366 F/g (x = 0.5, max), 162 F/g (x = 0.7) [28] Ni1-xZnxCo2O4 (x = 0.5) -------2 1228 F/g [30] Ni1-xFexCo2O4 (x = 1) --------1…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of Aluminum Doped Ni1−xAlxCo2O4 Hierarchical Nanostructure: Experimental and Theoretical Study

et al. 2021

View full text Add to dashboard Cite

show abstract

“…As evident from the variation in interatomic distances compared to the bulk materials, it is anticipated that the nanostructures demonstrate different In general, the density of states (DOS) values of the bulk and nanoparticles are comparable, and all of the investigated phases (bulk and nanoparticles) present a finite number of electrons that are determined at the Fermi energy (E f ). 54 The electron distribution of the nanoparticles at E f is substantially larger than that of their bulk phases. Compared to their bulk crystals, nanoparticles' unique optical and catalytic characteristics are enumerated by the scrutinized higher number of electrons at E f , which shows that the bonding interactions are weakened with their formulation.…”

Section: Analysis Of Atomic Chargesmentioning

confidence: 99%

Trimetallic ZIF-Derived Ni–Cu/NC Rhombic Dodecahedron Nanostructures on Butter Sheet Paper as a Flexible Electrochemical Probe for Nonenzymatic Glucose Sensors

Pappathi,

Vajeeston,

Sahaya Raja

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Rhombic dodecahedron-architectured Ni−Cu nanostructures pinned with N-doped carbon (Ni−Cu/NC) are manufactured using Ni−Cu−zeolitic imidazolate frameworks (Ni−Cu−ZIF-8) as soft templates. The as-established ZIF-8 and metal/NC series nanocatalysts are loaded on biodegradable butter sheet papers (BSPs) and used as flexible electrochemical probes for high-performance electrochemical nonenzymatic glucose sensors (ENEGSs). The optimized molecular and electronic structures and charge density distribution of as-formulated ZIF-8 and metal/C series nanostructures are realized with DFT studies, and the influences of aforesaid unique properties on glucose electrooxidation are established with various electrochemical techniques. Owing to the robust carbon network-interlaced metallic units, high electrical conductivity, large surface area, and extended active sites, Ni−Cu−ZIF-8-derived Ni−Cu/NC demonstrates the elevated ENEGS performance including lower detection limit, high sensitivity, and elevated specificity under alkaline regimes that actualize Ni−Cu/NC/BSP's practical glucose sensing recognition in human serum. Thus, the as-fabricated Ni−Cu/NC/BSP extends exclusive benefits of having simple fabrication and being cost-efficient, reliable, and reusable, along with high glucose sensing performance, accessing innovative conveniences to epitomize technically sound and economically viable boulevards in the amplification of ENEGSs.

show abstract

“…ZnO/NiO:rGO hydrothermal 622.3 F g -1 at 1 A g -1 54.4% at 5 A g -1 [46] Co(OH)2@Ni(OH)2 electrodeposition 355.2 C g -1 at 1 A g -1 65.9% at 17 A g -1 [7] Mn/Ni-MOF solvothermal 793.6 F g -1 at 1 A g -1 51.9% at 20 A g -1 [47] Zn-doped NiCo2O4 hydrothermal 1499.0 F g -1 at 0.5 A g -1 66.7% at 10 A g -1 [48] Zn/Ni-MOF hydrothermal 878.0 F g -1 at 1 A g -1 61.0% at 10 A g -1 [49] ZnO/NiO MOF solvothermal 435.1 F g -1 at 1 A g -1 69.3% at 10 A g -1 [50] ZNC-8.4% colloidal method 750.5 C g -1 at 0.5 A g -1 72.9% at 10 A g -1 This work…”

Section: Electrochemical Properties Of Znc-84% Samplementioning

confidence: 99%

Colloidal synthesis of flower-like Zn doped Ni(OH)2@CNTs at room-temperature for hybrid supercapacitor with high rate capability and energy density

Ren

Gan

Sun

et al. 2022

Electrochimica Acta

View full text Add to dashboard Cite

Hollow fibrous NiCo2O4 electrodes with controllable Zn substitution sites for supercapacitors

Cited by 19 publications

References 37 publications

Electrochemical Performance of Aluminum Doped Ni1−xAlxCo2O4 Hierarchical Nanostructure: Experimental and Theoretical Study

Electrochemical Performance of Aluminum Doped Ni1−xAlxCo2O4 Hierarchical Nanostructure: Experimental and Theoretical Study

Trimetallic ZIF-Derived Ni–Cu/NC Rhombic Dodecahedron Nanostructures on Butter Sheet Paper as a Flexible Electrochemical Probe for Nonenzymatic Glucose Sensors

Colloidal synthesis of flower-like Zn doped Ni(OH)2@CNTs at room-temperature for hybrid supercapacitor with high rate capability and energy density

Contact Info

Product

Resources

About