Fabrication of TiO2@C/N composite nanofibers and application as stable lithium-ion battery anode

Hu, Jiemei; Wang, Haoran; Qin, Chuanxiang; Li, Yi; Yang, Yonggang

doi:10.1016/j.matlet.2020.128491

Cited by 13 publications

(8 citation statements)

References 15 publications

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“…Chemical characterizations of Ni/CN, including XPS, FT-IR, and XRD measurements showed almost identical characteristics to those of CN (Figure S21). ,− ,− XPS measurements of Ni/CN revealed a very small amount (∼0.2 atom %) of Ni atoms, which was much different from those of Ni-NC-2, Ni-NC-3, and Ni@Ni-NC (Table S2). A small peak corresponding to Ni–N bonds was found in the deconvoluted XPS N 1s spectrum.…”

Section: Results and Discussionmentioning

confidence: 97%

“…The N 1s spectrum was deconvoluted to three peaks centered at 398.5, 400.1, and 401.4 eV, which correspond to CN–C groups, tertiary N atoms, and amino functional groups, respectively (Figure d). , The deconvoluted C 1s and N 1s XPS spectra of Ni@Ni-NC were significantly different from those of CN. The C 1s peaks were observed at 284.6, 285.8, 286.4, 287.4, and 289.0 eV, corresponding to C–C, CN, C–O, C–N, and O–CO groups, respectively (Figure c). − The N 1s peaks were found at 398.5, 399.6, 399.9, and 400.8 eV, corresponding to pyridinic N, Ni–N, pyrrolic N, and graphitic N groups, respectively (Figure d). , The characteristic peaks of the C 3 N 4 structure were reduced significantly, and the peak for Ni–N bonds newly appeared. The elemental C/N ratios and N amounts, which were determined through XPS measurements, changed significantly from 1.05 (CN) to 2.86 (Ni@Ni-NC), and from 47.1 (CN) to 20.5 atom % (Ni@Ni-NC) (Table S2).…”

Section: Results and Discussionmentioning

confidence: 99%

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Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Seok

Choi

Lee

et al. 2021

ACS Appl. Nano Mater.

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Supported Ni-based nanocatalysts have attracted much attention to replace noble metal catalysts (e.g., IrO2) for the oxygen evolution reaction (OER) due to their low costs. However, their low activity is the main hindrance for their use in the practical OER application. In this study, a Ni-based core–shell material (Ni@Ni-NC) is produced through the heat treatment of a mixture of urea and NiCl2·(H2O)6. Multiple analysis data reveal that the Ni@Ni-NC consists of a Ni nanoparticle core and several tens of nanometer-thick, N-doped carbon (NC) shell materials, in which atomically attached Ni-based species were homogeneously distributed. Ni@Ni-NC exhibits excellent electrocatalytic OER performance with over- and onset potentials of 371 mV and 1.51 V, respectively, which are better than those of commercial IrO2. As control samples, structural and electrochemical properties of various composites (Ni nanoparticles + N-doped graphene, Ni nanoparticles + C3N4, atomically dispersed Ni on a C3N4 surface) and acid-treated Ni@Ni-NC are investigated. These experiments reveal that the well-dispersed Ni–NC species and core–shell structures play pivotal roles in improving the electrocatalytic OER performance. Furthermore, density functional theory (DFT) calculations suggest the dual-site OER mechanism of the Ni–NC active species with a significantly low reaction barrier. The mechanisms for the formation of core–shell structures are studied with control samples, which are produced from different heating times, and DFT calculation suggested that the core/shell structure formation is attributed to the cohesive energy of the Ni particles and strong bonds between the Ni and NC supports. This work provides a facile strategy for designing supported Ni catalysts with core–shell architecture for electrocatalytic reactions and other advanced applications.

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Section: Results and Discussionmentioning

confidence: 97%

Section: Results and Discussionmentioning

confidence: 99%

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Seok

Choi

Lee

et al. 2021

ACS Appl. Nano Mater.

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“…The XPS survey spectrum (Figure a) demonstrated that C, N, O, and Ni elements were presented on the surface of Ni 0.02 /C-CNTs. The C 1s spectrum (Figure b) was deconvoluted into five independent peaks at 284.8, 286.2, 287.1, 288.2, and 290.1 eV, which were related to C–C, CN, C–O, C–N, and O–CO, respectively. − In the fitted N 1s spectrum (Figure c), the binding energies of 398.9, 401.1, and 404.4 eV were assigned to pyridinic N, graphitic N, and oxidized N, respectively. , Due to the existence of a lone pair in pyridinic N, it worked as an electric dipole scattering center for conductive charges and improved the dipole relaxation loss of the material. In addition, the excess weakly oriented electrons in graphitic N were beneficial for improving the conductivity and conduction loss. , Figure d presents the high-resolution XPS spectrum of Ni 2p.…”

Section: Resultsmentioning

confidence: 99%

Ni/C-Carbon Nanotube Multidimensional Heterospheres for Highly Efficient Microwave Absorbers

Liu

Wang

Sun

et al. 2022

ACS Appl. Nano Mater.

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For microwave absorbers, it is still a tremendous challenge to efficiently construct multidimensional heterostructures for achieving the synergy of multicomponent and multiloss modes. Herein, a kind of cocklebur-like Ni/C-CNT multidimensional heterosphere was obtained by a simple method with graphitic carbon nitride (g-C 3 N 4 ) and nickel oxide (NiO) as precursors.During the decomposition of g-C 3 N 4 at high temperatures, the vertical CNTs and amorphous carbon were produced on the surface of Ni nanoparticles reduced from NiO. It was found that the conductive network consisting of CNTs and heterospheres not only increased the conduction loss but also facilitated multiple reflection absorption. Moreover, the cocklebur-like heterostructures had many defects and interfaces, effectively realizing the synergistic effect of various loss mechanisms including conduction loss, interface polarization, and dipole polarization. In addition, this cocklebur-like multidimensional heterostructure was beneficial to improve the impedance matching of materials. Accordingly, with a filler loading of 30 wt %, the minimum reflection loss of Ni/C-CNT heterospheres was up to −41.60 dB, and the effective absorption bandwidth reached 4.1 GHz when the matching thickness was 2.4 mm. This work proposed a strategy for fabricating carbon nanotube-based composites with multidimensional heterostructures as efficient microwave absorbers.

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“…Porous TiO 2 nanocrystals embedded on carbon nanotubes offered simple channels for charge transfer and shortened the diffusion lengths. Moreover, integrated flexible mechanical structure was offered by N-doped carbon nanotubes [75].…”

Section: One-dimensional Structurementioning

confidence: 99%

TiO2 as an Anode of High-Performance Lithium-Ion Batteries: A Comprehensive Review towards Practical Application

et al. 2022

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Lithium-ion batteries (LIBs) are undeniably the most promising system for storing electric energy for both portable and stationary devices. A wide range of materials for anodes is being investigated to mitigate the issues with conventional graphite anodes. Among them, TiO2 has attracted extensive focus as an anode candidate due to its green technology, low volume fluctuations (<4%), safety, and durability. In this review, the fabrication of different TiO2 nanostructures along with their electrochemical performance are presented. Different nanostructured TiO2 materials including 0D, 1D, 2D, and 3D are thoroughly discussed as well. More precisely, the breakthroughs and recent developments in different anodic oxidation processes have been explored to identify in detail the effects of anodization parameters on nanostructure morphology. Clear guidelines on the interconnected nature of electrochemical behaviors, nanostructure morphology, and tunable anodic constraints are provided in this review.

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Fabrication of TiO2@C/N composite nanofibers and application as stable lithium-ion battery anode

Cited by 13 publications

References 15 publications

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Ni Nanoparticles on Ni Core/N-Doped Carbon Shell Heterostructures for Electrocatalytic Oxygen Evolution

Ni/C-Carbon Nanotube Multidimensional Heterospheres for Highly Efficient Microwave Absorbers

TiO2 as an Anode of High-Performance Lithium-Ion Batteries: A Comprehensive Review towards Practical Application

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