Oxygen-Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High-Energy Cathode for Advanced Zn-Ion Batteries

2018 ◽  
Vol 30 (33) ◽  
pp. 1802396 ◽  
Author(s):  
Yinxiang Zeng ◽  
Zhengzhe Lai ◽  
Yi Han ◽  
Haozhe Zhang ◽  
Shilei Xie ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
High Energy ◽  
Nickel Cobaltite ◽  
Surface Modulation

Oxygen-vacancy Bi2O3 nanosheet arrays with excellent rate capability and CoNi2S4 nanoparticles immobilized on N-doped graphene nanotubes as robust electrode materials for high-energy asymmetric supercapacitors

2019 ◽  
Vol 7 (13) ◽  
pp. 7918-7931 ◽  
Author(s):  
Jian Zhao ◽  
Zhenjiang Li ◽  
Tong Shen ◽  
Xiangcheng Yuan ◽  
Guanhao Qiu ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Electrode Materials ◽  
Rate Capability ◽  
High Energy ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Positive Electrodes ◽  
Nanosheet Arrays ◽  
Doped Graphene

An asymmetric supercapacitor with high energy was assembled by using the N-GNTs@OV-Bi2O3 NSAs and N-GNTs@CoNi2S4 NPs as negative and positive electrodes, respectively.

Oxygen-vacancy-rich NiCo2O4 nanoneedles electrode with poor crystallinity for high energy density all-solid-state symmetric supercapacitors

2020 ◽  
Vol 449 ◽  
pp. 227571 ◽  
Author(s):  
Zhanzhi Cao ◽  
Chunhua Liu ◽  
Yunxia Huang ◽  
Ya Gao ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Oxygen Vacancy ◽  
High Energy ◽  
High Energy Density

scholarly journals Real-Time Identification of Oxygen Vacancy Centers in LiNbO3 and SrTiO3 during Irradiation with High Energy Particles

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 315 ◽  
Author(s):  
Miguel L. Crespillo ◽  
Joseph T. Graham ◽  
Fernando Agulló-López ◽  
Yanwen Zhang ◽  
William J. Weber
Keyword(s):  
Oxygen Vacancy ◽  
Real Time ◽  
Oxygen Vacancies ◽  
Emission Spectra ◽  
Alkali Halides ◽  
High Energy ◽  
Color Centers ◽  
Precise Control ◽  
Real Time Identification ◽  
High Energy Particles

Oxygen vacancies are known to play a central role in the optoelectronic properties of oxide perovskites. A detailed description of the exact mechanisms by which oxygen vacancies govern such properties, however, is still quite incomplete. The unambiguous identification of oxygen vacancies has been a subject of intense discussion. Interest in oxygen vacancies is not purely academic. Precise control of oxygen vacancies has potential technological benefits in optoelectronic devices. In this review paper, we focus our attention on the generation of oxygen vacancies by irradiation with high energy particles. Irradiation constitutes an efficient and reliable strategy to introduce, monitor, and characterize oxygen vacancies. Unfortunately, this technique has been underexploited despite its demonstrated advantages. This review revisits the main experimental results that have been obtained for oxygen vacancy centers (a) under high energy electron irradiation (100 keV–1 MeV) in LiNbO3, and (b) during irradiation with high-energy heavy (1–20 MeV) ions in SrTiO3. In both cases, the experiments have used real-time and in situ optical detection. Moreover, the present paper discusses the obtained results in relation to present knowledge from both the experimental and theoretical perspectives. Our view is that a consistent picture is now emerging on the structure and relevant optical features (absorption and emission spectra) of these centers. One key aspect of the topic pertains to the generation of self-trapped electrons as small polarons by irradiation of the crystal lattice and their stabilization by oxygen vacancies. What has been learned by observing the interplay between polarons and vacancies has inspired new models for color centers in dielectric crystals, models which represent an advancement from the early models of color centers in alkali halides and simple oxides. The topic discussed in this review is particularly useful to better understand the complex effects of different types of radiation on the defect structure of those materials, therefore providing relevant clues for nuclear engineering applications.

Carbon dioxide directly induced oxygen vacancy in the surface of lithium-rich layered oxides for high-energy lithium storage

2019 ◽  
Vol 432 ◽  
pp. 8-15 ◽  
Author(s):  
Zhe Huang ◽  
Tengfei Xiong ◽  
Xin Lin ◽  
Meiyue Tian ◽  
Weihao Zeng ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Vacancy ◽  
High Energy ◽  
Layered Oxides ◽  
Lithium Storage

Oxygen vacancy confined nickel cobaltite nanostructures as an excellent interface for the enzyme-free electrochemical sensing of extracellular H2O2 secreted from live cells

2020 ◽  
Vol 44 (33) ◽  
pp. 14050-14059
Author(s):  
Paramasivam Balasubramanian ◽  
Shao-Bin He ◽  
Arumugam Jansirani ◽  
Hao-Hua Deng ◽  
Hua-Ping Peng ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Research Interest ◽  
Electrochemical Sensing ◽  
Live Cells ◽  
Nickel Cobaltite

Oxygen vacancy (OV) manufacturing is an effective way to boost the efficiency of a catalyst; therefore, the development of OV-rich catalysts has attracted substantial research interest.

scholarly journals Nickel Cobaltite Functionalized Silver Doped Carbon Xerogels as Efficient Electrode Materials for High Performance Symmetric Supercapacitor

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4906
Author(s):  
Madlin A. Wasfey ◽  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas ◽  
H. H Abdullah ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Specific Capacitance ◽  
Surface Area ◽  
Active Sites ◽  
Electrode Materials ◽  
Hybrid Composites ◽  
High Energy ◽  
Equivalent Series Resistance ◽  
Carbon Xerogels ◽  
Nickel Cobaltite

Introducing new inexpensive materials for supercapacitors application with high energy density and stability, is the current research challenge. In this work, Silver doped carbon xerogels have been synthesized via a simple sol-gel method. The silver doped carbon xerogels are further surface functionalized with different loadings of nickel cobaltite (1 wt.%, 5 wt.%, and 10 wt.%) using a facile impregnation process. The morphology and textural properties of the obtained composites are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen physisorption analysis. The silver doped carbon xerogels display a higher surface area and larger mesopore volume compared to the un-doped carbon xerogels and hierarchically porous structure is obtained for all materials. The hybrid composites have been utilized as electrode materials for symmetric supercapacitors in 6 M KOH electrolyte. Among all the hybrid composites, silver doped carbon xerogel functionalized with 1 wt.% nickel cobaltite (NiCo1/Ag-CX) shows the best supercapacitor performance: high specific capacitance (368 F g−1 at 0.1 A g−1), low equivalent series resistance (1.9 Ω), high rate capability (99% capacitance retention after 2000 cycles at 1 A g−1), and high energy and power densities (50 Wh/Kg, 200 W/Kg at 0.1 A g−1). It is found that the specific capacitance does not only depend on surface area, but also on others factors such as particle size, uniform particle distribution, micro-mesoporous structure, which contribute to abundant active sites and fast charge, and ion transfer rates between the electrolyte and the active sites.

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