Journal ArticleDOI
Localized Electrons Enhanced Ion Transport for Ultrafast Electrochemical Energy Storage
Jiewei Chen,Bi Luo,Qiushui Chen,Fei Li,Yanjiao Guo,Tom Wu,Peng Peng,Xian Qin,Gaoxiang Wu,Mengqi Cui,Lehao Liu,Lihua Chu,Bing Jiang,Yingfeng Li,Xueqing Gong,Yang Chai,Yongping Yang,Yonghua Chen,Wei Huang,Wei Huang,Xiaogang Liu,Meicheng Li +21 more
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TLDR
A localized electron enhanced ion transport mechanism to promote ion mobility for ultrafast energy storage is proposed, and experiment results reveal that this mechanism leads to an enhancement of Li/Na ion diffusivity by two orders of magnitude.Abstract:
The rate-determining process for electrochemical energy storage is largely determined by ion transport occurring in the electrode materials. Apart from decreasing the distance of ion diffusion, the enhancement of ionic mobility is crucial for ion transport. Here, a localized electron enhanced ion transport mechanism to promote ion mobility for ultrafast energy storage is proposed. Theoretical calculations and analysis reveal that highly localized electrons can be induced by intrinsic defects, and the migration barrier of ions can be obviously reduced. Consistently, experiment results reveal that this mechanism leads to an enhancement of Li/Na ion diffusivity by two orders of magnitude. At high mass loading of 10 mg cm-2 and high rate of 10C, a reversible energy storage capacity up to 190 mAh g-1 is achieved, which is ten times greater than achievable by commercial crystals with comparable dimensions.read more
Citations
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Synergistic Effect of Nitrogen and Sulfur Dual-Doping Endows TiO2 with Exceptional Sodium Storage Performance
Journal ArticleDOI
Controllable defect engineering enhanced bond strength for stable electrochemical energy storage
Tingting Liu,Na Peng,Xikun Zhang,Runtian Zheng,Maoting Xia,Haoxiang Yu,Miao Shui,Ying Xie,Jie Shu,Jie Shu +9 more
TL;DR: In this paper, a series of concentrations of sulfur vacancies are introduced in transition metal dichalcogenides (TMDs) by annealing methods, which enhances bond strength of Ti-S bonds near the defect area and improves electronic structure.
Journal ArticleDOI
Defect calculations in semiconductors through a dielectric-dependent hybrid DFT functional: the case of oxygen vacancies in metal oxides
Matteo Gerosa,Carlo Enrico Bottani,Lucia Caramella,Giovanni Onida,Cristiana Di Valentin,Gianfranco Pacchioni +5 more
TL;DR: This novel approach to investigate the behavior of oxygen vacancies in three different metal-oxide semiconductors using a recently proposed hybrid density-functional method is able to reproduce not only ground-state properties and band structures of perfect bulk oxide materials but also provides results consistent with the optical and electrical behavior observed in the corresponding substoichiometric defective systems.
Liquefied Gas Electrolytes for Electrochemical Energy Storage Devices
TL;DR: In this article, the use of a liquefied gas electrolyte has been explored for electrochemical energy storage devices, such as lithium-ion batteries and electrochemical capacitors.
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Noble-metal and cocatalyst free W2N/C/TiO photocatalysts for efficient photocatalytic overall water splitting in visible and near-infrared light regions
TL;DR: In this article, a ternary bridge chain W2N/C/TiO photocatalyst was proposed to realize an efficient and stable visible and NIR light driven water splitting.
References
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Electrodes with high power and high capacity for rechargeable lithium batteries.
Kisuk Kang,Ying Shirley Meng,Ying Shirley Meng,Julien Breger,Julien Breger,Clare P. Grey,Clare P. Grey,Gerbrand Ceder,Gerbrand Ceder +8 more
TL;DR: By modifying its crystal structure, lithium nickel manganese oxide is obtained unexpectedly high rate-capability, considerably better than lithium cobalt oxide (LiCoO2), the current battery electrode material of choice.
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Effects of F- Doping on the Photocatalytic Activity and Microstructures of Nanocrystalline TiO2 Powders
TL;DR: In this article, a novel and simple method for preparing highly photoactive nanocrystalline F-doped TiO2 photocatalyst with anatase and brookite phase was developed by hydrolysis of titanium tetraisopropoxide in a mixed NH4F−H2O solution.
Journal ArticleDOI
True Performance Metrics in Electrochemical Energy Storage
Yury Gogotsi,Patrice Simon +1 more
TL;DR: It is shown that even when some metrics seem to support energy densities for ECs approaching or even exceeding that of batteries, actual device performance may be rather mediocre.
Journal ArticleDOI
Sulphur–TiO2 yolk–shell nanoarchitecture with internal void space for long-cycle lithium–sulphur batteries
Zhi Wei Seh,Weiyang Li,Judy J. Cha,Guangyuan Zheng,Yuan Yang,Matthew T. McDowell,Po-Chun Hsu,Yi Cui,Yi Cui +8 more
TL;DR: This work demonstrates the design of a sulphur-TiO(2) yolk-shell nanoarchitecture with internal void space to accommodate the volume expansion of sulphur, resulting in an intact TiO( 2) shell to minimize polysulphide dissolution.
Journal ArticleDOI
Effect of nature and location of defects on bandgap narrowing in black TiO2 nanoparticles.
Alberto Naldoni,Mattia Allieta,Saveria Santangelo,Marcello Marelli,Filippo Fabbri,S. Cappelli,Claudia L. Bianchi,Rinaldo Psaro,Vladimiro Dal Santo +8 more
TL;DR: It is demonstrated that black TiO(2) nanoparticles obtained through a one-step reduction/crystallization process exhibit a bandgap of only 1.85 eV, which matches well with visible light absorption.