Synthesis and characterization of NiCo2O4 nanospheres/nitrogen-doped graphene composites with enhanced electrochemical performance

Chang, Xinwei; Li, Weilong; Liu, Yanping; He, Mi; Zheng, Xinliang; Lv, Xiaozhou; Ren, Zhaoyu

doi:10.1016/j.jallcom.2019.01.036

Cited by 30 publications

(7 citation statements)

References 58 publications

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“…NiCo 2 O 4 nano-/microstructures of various shapes and morphologies have been prepared hydrothermally. Nano-/micro-structured NiCo 2 O 4 of morphologies such as urchin shaped [89], corallike [90], core-ring-structured nanoplatelets [91], porous coral-like nanospheres [36], hollow nanospheres [92], nanospheres [93], urchin-like spheres [94], mesoporous nanoparticles [95], mesoporous nanoneedles [96,97], 3D network-like mesoporous nanostructures [98], 3D hierarchical tremella-like, flower-like, urchin-like and pine needle-like [99], nanoflakes [100], nanowalls [101] [103], diethylene glycol (DEG), cetyltrimethylammonium bromide (CTAB) [104], sodium dodecyl sulfate (SDS) [105], poly(diallyldimethylammonium chloride) (PDDA) [106], glycine [107], methyl glycerate [108], and ethylene glycol are added in the reaction mixture. The combination of some polar solvents such as ethanol, ethanol, propanol, ethylene glycol, and acetone along with water has also been found to facilitate the morphological characteristics [109].…”

Section: Hydrothermal/solvothermal Methodsmentioning

confidence: 99%

Section: Synthesis Of Nano-/micro-structured Nico 2 Omentioning

confidence: 99%

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NiCo2O4 Nano-/Microstructures as High-Performance Biosensors: A Review

Kumar¹

2020

Nano-Micro Lett.

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Non-enzymatic biosensors based on mixed transition metal oxides are deemed as the most promising devices due to their high sensitivity, selectivity, wide concentration range, low detection limits, and excellent recyclability. Spinel NiCo2O4 mixed oxides have drawn considerable attention recently due to their outstanding advantages including large specific surface area, high permeability, short electron, and ion diffusion pathways. Because of the rapid development of non-enzyme biosensors, the current state of methods for synthesis of pure and composite/hybrid NiCo2O4 materials and their subsequent electrochemical biosensing applications are systematically and comprehensively reviewed herein. Comparative analysis reveals better electrochemical sensing of bioanalytes by one-dimensional and two-dimensional NiCo2O4 nano-/microstructures than other morphologies. Better biosensing efficiency of NiCo2O4 as compared to corresponding individual metal oxides, viz. NiO and Co3O4, is attributed to the close intrinsic-state redox couples of Ni3+/Ni2+ (0.58 V/0.49 V) and Co3+/Co2+ (0.53 V/0.51 V). Biosensing performance of NiCo2O4 is also significantly improved by making the composites of NiCo2O4 with conducting carbonaceous materials like graphene, reduced graphene oxide, carbon nanotubes (single and multi-walled), carbon nanofibers; conducting polymers like polypyrrole (PPy), polyaniline (PANI); metal oxides NiO, Co3O4, SnO2, MnO2; and metals like Au, Pd, etc. Various factors affecting the morphologies and biosensing parameters of the nano-/micro-structured NiCo2O4 are also highlighted. Finally, some drawbacks and future perspectives related to this promising field are outlined.

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Section: Hydrothermal/solvothermal Methodsmentioning

confidence: 99%

Section: Synthesis Of Nano-/micro-structured Nico 2 Omentioning

confidence: 99%

NiCo2O4 Nano-/Microstructures as High-Performance Biosensors: A Review

Kumar¹

2020

Nano-Micro Lett.

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“…Other spectrum that can be observed is O 1s, and it is shown in Figure 4a, which is attributed to the O 2 − anions produced by the metal−oxygen bonds of the synthesis structure, with Co−O, Ni−O, and OH groups and oxygen vacancies present in different oxidation states where the presence of Co and Ni alloys can be seen on the surface. 48,49 The adjusted results confirm that MW heating and cold drying improve the degree of oxidation of the materials and reduce the concentration of heteroatomic defects. At the same time, the presence of heteroatoms causes point defects on the surface of the material, which leads to the segregation of electron clouds and the polarization of defects that are not present in these samples.…”

Section: Physicochemical Analysis Scanning Electron Microscopy (Sem) ...mentioning

confidence: 63%

Nickel–Cobalt Aerogel as a Highly Efficient Electrocatalyst for Dual Microfluidic Applications: Hydrogen Generation and Power Energy from Nitrogenous Compounds

Martínez-Lázaro,

Rodríguez-Buenrostro,

Rodríguez-Barajas

et al. 2024

Energy Fuels

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This research work presents a novel unsupported NiCo aerogel with high electrocatalytic activity, which was synthesized by an ultrafast method combining microwave heating and lyophilization. The novel aerogel was used as an electrocatalyst for the oxidation reactions of two different nitrogen compounds: urea and ammonium, with the aim of reducing the pollutant content in water and generating clean energy from the reduced hydrogen of oxidizing species. The NiCo aerogel was incorporated/evaluated in a microfluidic device in two ways: as an ammonium fuel cell and an alkaline urea electrolyzer, producing clean hydrogen in both systems. The unique physicochemical properties, particle size smaller than 0.1 nm, surface area of 52 m 2 g −1 , and the presence of NiCo metal alloys with the addition of species Ni−O, Ni−OH, and a higher percentage of Ni 2+ enable the effective oxidation of species in the alkaline medium. Hydrogen production and power densities of up 3 × 10 −4 μg s −1 and 0.74 mW cm −2 , respectively, are observed. This work demonstrates for the first time an aerogel structure of non-noble metal (NiCo) used in two different microfluidic devices that oxidize nitrogenous compounds such as urea and ammonium and produce clean fuel as hydrogen.

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“…The doping of nitrogen atoms can substantially enhance the performances of graphene in the applications, such as supercapacitors, owing to the enhanced polarity of surface and electric conductivity. The pyrrolic nitrogen atoms can especially endow excellent electronic properties for graphene [39]. Hybrids of NiCo 2 O 4 /N-rGO had large specific capacitance and high activity as electrode materials for supercapacitors [40].…”

Section: Powder Compositesmentioning

confidence: 99%

Recent Research of NiCo2O4/Carbon Composites for Supercapacitors

Yang

Cheng

et al. 2022

Surfaces

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Supercapacitors have played an important role in electrochemical energy storage. Recently, researchers have found many effective methods to improve electrode materials with more robust performances through the increasing volume of scientific publications in this field. Though nickel cobaltite (NiCo2O4), as a promising electrode material, has substantially demonstrated potential properties for supercapacitors, its composites usually show much better performances than the pristine NiCo2O4. The combination of carbon-based materials and NiCo2O4 has been implemented recently due to the dual mechanisms for energy storage and the unique advantages of carbon materials. In this paper, we review the recent research on the hybrids of NiCo2O4 and carbon nanomaterials for supercapacitors. Typically, we focused on the reports related to the composites containing graphene (or reduced graphene oxide), carbon nanotubes, and amorphous carbon, as well as the major synthesis routes and electrochemical performances. Finally, the prospect for the future work is also discussed.

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Synthesis and characterization of NiCo2O4 nanospheres/nitrogen-doped graphene composites with enhanced electrochemical performance

Cited by 30 publications

References 58 publications

NiCo2O4 Nano-/Microstructures as High-Performance Biosensors: A Review

NiCo2O4 Nano-/Microstructures as High-Performance Biosensors: A Review

Nickel–Cobalt Aerogel as a Highly Efficient Electrocatalyst for Dual Microfluidic Applications: Hydrogen Generation and Power Energy from Nitrogenous Compounds

Recent Research of NiCo2O4/Carbon Composites for Supercapacitors

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