Design and preparation of Cu-doped NiCo2O4 nanosheets with intrinsic porosities for symmetric supercapacitors

Han, Xuanxuan; Song, Lili; Ding, Jiandong; Hu, Linlin; Xu, Cuirong; Wang, Yuqiao

doi:10.1016/j.matlet.2020.128400

Cited by 23 publications

(13 citation statements)

References 13 publications

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“…Then, the absorbance at λ max = 652 nm was monitored up to 60 min using a Shimadzu 2600 UV-Vis spectrophotometer. The influence of various experimental parameters such as amount of catalyst dispersion (20-100 μL), pH of buffer (2)(3)(4)(5)(6)(7)(8)(9)(10)(11) and leaching on the peroxidase-like activity was studied under the same conditions. While using TMB as substrate during the kinetic studies, the concentration of H 2 O 2 (100 mM) and other conditions were kept constant and different concentration of TMB (2-12 mM) was employed.…”

Section: Peroxidase-like Activity Studiesmentioning

confidence: 99%

“…[8] Hydrothermal method has been reported for the synthesis of Cu-doped NiCo 2 O 4 nanosheets by Han et al and the authors have tested them as supercapacitors. [9] Lee et al have reported the synthesis of Irdoped NiCo 2 O 4 nanostructures for oxygen evolution reaction. [10] Nanozymes are artificial enzymes which are made up of nanomaterials and they exhibit enzyme-like activity.…”

Section: Introductionmentioning

confidence: 99%

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Iron‐Doped NiCo₂O₄ Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

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Jeevanandam

2022

Eur J Inorg Chem

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The present study reports the synthesis of iron-doped NiCo 2 O 4 nanoparticles (Ni 1À x Fe x Co 2 O 4 ) using homogeneous precipitation method followed by calcination. The precursors (NiÀ Co layered double hydroxides) and iron-doped NiCo 2 O 4 nanoparticles were characterized using various analytical techniques. XRD results indicate formation of iron-doped NiCo 2 O 4 nanoparticles up to x = 0.5 and when x � 0.7, there is also formation of α-Fe 2 O 3 . TEM images show formation of nanorods composed of nanoparticles in the iron-doped NiCo 2 O 4 nanoparticles. DRS results demonstrate change in optical properties upon doping of iron in the NiCo 2 O 4 nanoparticles. MÀ H measurements show soft ferromag-netic behavior of pure and iron-doped NiCo 2 O 4 nanoparticles at 300 K. At 5 K, soft ferromagnetic behavior is observed up to x = 0.3 in Ni 1À x Fe x Co 2 O 4 nanoparticles, and when x = 0.7, strong ferromagnetic behavior is observed. When x = 0.5, "wasp-waist" behavior is observed. The ZFC-FC measurements show single blocking temperature up to x = 0.3 while two blocking temperatures are observed when x = 0.5. When x = 0.7, the blocking temperature is above room temperature. After characterization, the peroxidase-like activity using iron-doped NiCo 2 O 4 nanoparticles as catalyst was investigated using oxidation of 3,3',5,5'tetramethyl benzidine as substrate.

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Section: Peroxidase-like Activity Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Iron‐Doped NiCo₂O₄ Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

Lather

Jeevanandam

2022

Eur J Inorg Chem

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“…Heteroatom doping is expected to achieve simultaneous regulation of conductivity, activity, and stability from the intrinsic structure, such as sulfide-doped NiCoP and copper-doped NiCo 2 O 4 . 6,13 The influence of doping on the physical and chemical properties of the substrate is easy to predict by theoretical calculations. In our previous work, we can make full use of density functional theory (DFT) to estimate key parameters, including band structure, density of states (DOS), charge distribution, and adsorption energy.…”

Section: Introductionmentioning

confidence: 99%

“…The efficient processes require electrodes with high conductivity and abundant active sites. − Previous reports have carried out exploratory work from the following two aspects: (1) from the perspective of morphology, the multi-dimensional structure can provide a wealth of available active sites to participate in surface reactions and achieve rapid reaction kinetics. , (2) In terms of composition, multiple components can build a relatively stable physical structure to resist the damage of the electrochemical cycle and ensure cycling stability. , The above two methods rely on external effects to improve performance. Heteroatom doping is expected to achieve simultaneous regulation of conductivity, activity, and stability from the intrinsic structure, such as sulfide-doped NiCoP and copper-doped NiCo 2 O 4 . , …”

Section: Introductionmentioning

confidence: 99%

Effect of Substitutional and Interstitial Boron-Doped NiCo₂S₄ on the Electronic Structure and Surface Adsorption: High Rate and Long-Term Stability

Lei

Song

Zhang

et al. 2022

ACS Appl. Energy Mater.

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The effect of substitutional and interstitial doping on the electronic structure and surface adsorption plays an important role in tuning physical and chemical properties. Herein, boron-doped NiCo2S4 (B-NiCo2S4) was designed and prepared for high rate and long-term stability supercapacitors, considering the substitutional and interstitial boron (Bsub and Bint) doping due to similar atomic size. The low conductivity and slow reaction kinetics of NiCo2S4 hampered its rate performance and weak cycle stability for energy storage devices. After boron doping, B-NiCo2S4 can promote electron transfer to improve rate performance and increase surface adsorption energy to capture the electrolyte ion due to electronegativity difference during the charge/discharge process. Furthermore, the contribution of Bsub and Bint doping modes can be elucidated by density functional theory calculations. The density of states of B-NiCo2S4 (26.7 eV–1) was much higher than that of NiCo2S4 (6.2 eV–1) near the Fermi level resulting from Bsub doping. The doping-induced charge transfer was enhanced by adjusting the position of the Fermi level. Bint doping redistributed the surface charge, resulting in increased OH– adsorption and then improved Faradaic reaction kinetics in alkaline electrolyte. This research strategy implements the research of synergistic promotion of theoretical prediction and experimental verification very well.

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“…Intrinsic porosity can ensure rapid electron transfer, ion diffusion, and durable cycle stability. 22 The intrinsic porosity is considered as a porous structure formed by self-assembly on a nanosheet surface. It is different from the pore structure formed by stacking micro-or nanostructural units.…”

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confidence: 99%

Sulfide-Fixed Intrinsic Porous NiCoP for Boosting High Capacitance and Long-Term Stability

Song

Wang

et al. 2021

ACS Materials Lett.

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The electrochemical activity and stability of energy storage devices determine their practical prospects. In this work, we developed a method to form sulfide-fixed intrinsic porous NiCoP by sequential heat treatment, phosphorization, and vulcanization from Ni–Co layered double hydroxides. The intrinsic porosity is different from the pore structure constructed by traditional micronano structure because of the secondary defect structures accompanying the preparation process. The further sulfurization of the phosphide can form sulfides near the intrinsic pores. The sulfides of NiS and Co3S4 are typically enriched around the pores. These sulfides can enhance the electrochemical activity and robustness of the pores. The changes in the electronic structure and atomic packing factor were conducive to enhanced conductivity and structural stability because of the differences in electronegativity and atomic radius based on sulfur and phosphorus atoms. The charge storage mechanism was also evaluated by semiempirical equations to further verify how vulcanization increased the capacitance.

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Design and preparation of Cu-doped NiCo2O4 nanosheets with intrinsic porosities for symmetric supercapacitors

Cited by 23 publications

References 13 publications

Iron‐Doped NiCo₂O₄ Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

Iron‐Doped NiCo₂O₄ Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

Effect of Substitutional and Interstitial Boron-Doped NiCo₂S₄ on the Electronic Structure and Surface Adsorption: High Rate and Long-Term Stability

Sulfide-Fixed Intrinsic Porous NiCoP for Boosting High Capacitance and Long-Term Stability

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Design and preparation of Cu-doped NiCo2O4 nanosheets with intrinsic porosities for symmetric supercapacitors

Cited by 23 publications

References 13 publications

Iron‐Doped NiCo2O4 Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

Iron‐Doped NiCo2O4 Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

Effect of Substitutional and Interstitial Boron-Doped NiCo2S4 on the Electronic Structure and Surface Adsorption: High Rate and Long-Term Stability

Sulfide-Fixed Intrinsic Porous NiCoP for Boosting High Capacitance and Long-Term Stability

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Product

Resources

About

Iron‐Doped NiCo₂O₄ Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

Iron‐Doped NiCo₂O₄ Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

Effect of Substitutional and Interstitial Boron-Doped NiCo₂S₄ on the Electronic Structure and Surface Adsorption: High Rate and Long-Term Stability