F-doped TiO2(B)/reduced graphene for enhanced capacitive lithium-ion storage

Zhou, Ziwang; Yang, Rong; Teng, Yixiang; Li, Yafeng; Mao, Wei

doi:10.1016/j.jcis.2023.01.070

Cited by 12 publications

(10 citation statements)

References 35 publications

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“…For example, carbon-based materials including activated carbon, graphene oxide, carbon NTs have been widely used to decorate F-doped TiO 2 , which shows enhanced visible light absorption, conductivity, and large surface area for adsorption. [106][107][108][109] Besides, the heterojunction by F-doped TiO 2 and other semiconductors, for example, Bi 2 O 3 , [110] V 2 O 5 , [111] CdS, [112] etc., can also show enhanced photocatalytic activity.…”

Section: Synergy Effect Of F and Co-doped Elementsmentioning

confidence: 99%

Direct and Indirect Effects of Fluorine on the Photocatalytic Performance of Titania‐Based Photocatalysts

Schmuki

2023

Energy Tech

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TiO2 used as a light‐absorbing semiconductor represents the classic benchmark for photocatalytic solar energy conversion and many other photocatalytic reactions. Various strategies are developed to improve the photoresponse of TiO2‐based materials, such as bandgap engineering or surface sensitization in combination with nanostructuring and geometry optimization. The present feature article is focused on direct and indirect approaches involving bulk or surface fluorine used to tune the surface chemistry, electronic structure, and the morphology of TiO2 photocatalysts. A comprehensive overview is provided on fluorine effects on TiO2, involving morphology modifications, and how surface or bulk fluorine affect the photocatalytic performance of TiO2. After outlining some basic interaction principles of F and TiO2, characterization techniques for different fluorine species are discussed. It is reviewed how fluorine during crystal growth mediates the morphology of TiO2; then how surface fluorination and doping fluorine effects can be beneficially utilized in photocatalysis are discussed. Finally, synergistic effects between fluorine and cocatalyst are discussed, for example, the use of lattice fluorine species to stabilize Pt single‐atom cocatalysts. Finally, the challenges and outlook on further advancing the development of fluorine effects are highlighted.

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Section: Synergy Effect Of F and Co-doped Elementsmentioning

confidence: 99%

Direct and Indirect Effects of Fluorine on the Photocatalytic Performance of Titania‐Based Photocatalysts

Schmuki

2023

Energy Tech

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“…Therefore, constructing nanostructures and nanocomposites incorporating additional conductive materials are the most widely utilized methods to enhance the ion/electron transfer in TiO 2 . − Furthermore, it has been recently demonstrated that dual-phase TiO 2 is able to provide additional diffusion channels and active storage sites at the interfaces between two TiO 2 -based phases. − The underlying mechanism is based on the so-called “job-sharing” mechanism, as proposed by Maier et al, , which assumes that the interfaces consisting of a Li + -accepting phase and an electron-accepting phase are favorable for extra lithium storage. According to the charge separation argument in semiconductive bronze/anatase TiO 2 , bronze TiO 2 can serve as the Li + -accepting phase, while anatase serves as the electron acceptor.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Enhancement of Lithium Transfer Kinetics and Structural Stability in Dual-Phase TiO₂ Electrodes by Ruthenium Doping

Zheng,

Xia,

Yaqoob

et al. 2024

ACS Appl. Mater. Interfaces

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Dual-phase TiO 2 consisting of bronze and anatase phases is an attractive electrode material for fast-charging lithium-ion batteries due to the unique phase boundaries present. However, further enhancement of its lithium storage performance has been hindered by limited knowledge on the impact of cation doping as an efficient modification strategy. Here, the effects of Ru 4+ doping on the dual-phase structure and the related lithium storage performance are demonstrated for the first time. Structural analysis reveals that an optimized doping ratio of Ru:Ti = 0.01:0.99 (1-RTO) is vital to maintain the dual-phase configuration because the further increment of Ru 4+ fraction would compromise the crystallinity of the bronze phase. Various electrochemical tests and density functional theory calculations indicate that Ru 4+ doping in 1-RTO enables more favorable lithium diffusion in the bulk for the bronze phase as compared to the undoped TiO 2 (TO) counterpart, while lithium kinetics in the anatase phase are found to remain similar. Furthermore, Ru 4+ doping leads to a better cycling stability for 1-RTO-based electrodes with a capacity retention of 82.1% after 1200 cycles at 8 C as compared to only 56.1% for TO-based electrodes. In situ X-ray diffraction reveals a reduced phase separation in the lithiated anatase phase, which is thought to stabilize the dual-phase architecture during extended cycling. The simultaneous enhancement of rate ability and cycling stability of dual-phase TiO 2 enabled by Ru 4+ doping provides a new strategy toward fast-charging lithium-ion batteries.

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“…In the rapidly evolving modern society, new battery technologies are assuming a progressively significant role. Lithium-ion batteries are used in various fields of life, such as smartphones, wearable devices, and new energy vehicles, due to their long cycle life, excellent fast charging ability, and environmental friendliness. − In the realm of new energy vehicles, the limited energy density of lithium-ion batteries poses a challenge in meeting the growing demand for an extended driving range. There is an urgent need for the development of novel batteries with enhanced energy density. − In recent years, LSBs have gained significant attention due to their exceptionally high theoretical capacity (1675 mA h g –1 ) and impressive energy density (2600 W h kg –1 ). − Despite these promising attributes, several challenges continue to impede its commercialization.…”

Section: Introductionmentioning

confidence: 99%

Keggin-Type Polyoxometalate and Co Nanoparticles Codecorated Separator for High-Performance Lithium–Sulfur Battery

Sun,

Wu,

Xia

et al. 2024

Crystal Growth & Design

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The Li−S battery has garnered widespread attention as an intriguing new energy storage equipment due to its remarkable energy density and low cost. Nevertheless, the infamous shuttle effect seriously hinders the commercialization process. In order to address this issue, this study rationally synthesizes the composites comprising Keggin-type polyoxometalate and Co nanoparticles, which are then coated on a pristine polypropylene separator. The modified separator can greatly inhibit lithium polysulfide shuttling, thereby leading to a greatly improved electrochemical performance. At the first cycle, the fabricated Li−S battery exhibits a specific discharge capacity of 1335.7 mA h g −1 , surpassing the 938.7 mA h g −1 capacity of an unmodified separator. At a current density of 1C, the initial reversible discharge capacity reaches 988.2 mA h g −1 , and even after 500 cycles, it still retains a remaining capacity of 664.2 mA h g −1 , with a capacity decay rate of 0.066% per cycle. Even at a high sulfur loading of 4.2 mg cm −2 , the device displays a remarkable initial discharge capacity of 1158.2 mA h g −1 , with a remaining capacity of 952.7 mA h g −1 after 70 cycles (0.1C). This significant performance enhancement could be ascribed to the synergistic effect of PMo 12 /Co−NCe, which exhibits greatly decreased electron transfer resistance and contact angle to the electrolyte, facilitating the rapid transport of Liion and kinetics. Meanwhile, the severe shuttle effect is alleviated effectively by combining the strong catalytic activity of PMo 12 and Co nanoparticles with long-chain polysulfides.

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F-doped TiO2(B)/reduced graphene for enhanced capacitive lithium-ion storage

Cited by 12 publications

References 35 publications

Direct and Indirect Effects of Fluorine on the Photocatalytic Performance of Titania‐Based Photocatalysts

Direct and Indirect Effects of Fluorine on the Photocatalytic Performance of Titania‐Based Photocatalysts

Simultaneous Enhancement of Lithium Transfer Kinetics and Structural Stability in Dual-Phase TiO₂ Electrodes by Ruthenium Doping

Keggin-Type Polyoxometalate and Co Nanoparticles Codecorated Separator for High-Performance Lithium–Sulfur Battery

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F-doped TiO2(B)/reduced graphene for enhanced capacitive lithium-ion storage

Cited by 12 publications

References 35 publications

Direct and Indirect Effects of Fluorine on the Photocatalytic Performance of Titania‐Based Photocatalysts

Direct and Indirect Effects of Fluorine on the Photocatalytic Performance of Titania‐Based Photocatalysts

Simultaneous Enhancement of Lithium Transfer Kinetics and Structural Stability in Dual-Phase TiO2 Electrodes by Ruthenium Doping

Keggin-Type Polyoxometalate and Co Nanoparticles Codecorated Separator for High-Performance Lithium–Sulfur Battery

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Product

Resources

About

Simultaneous Enhancement of Lithium Transfer Kinetics and Structural Stability in Dual-Phase TiO₂ Electrodes by Ruthenium Doping