Graphene/MxWO3 (M=Na, K) nanohybrids with excellent electrical properties

Liu, Bin; Yin, Shu; Wu, Xiaoyong; Wang, Yuhua; Huang, Yunfang; Wu, Jihuai; Sekino, Tohru; Matsushita, Jun‐ichi; Lee, Soo Wohn; Kobayashi, Makoto; Kakihana, Masato; Sato, Tsugio

doi:10.1016/j.carbon.2015.06.072

Cited by 16 publications

(7 citation statements)

References 38 publications

(49 reference statements)

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“…Furthermore, two weak signals at around 33.25 eV (W 4+ 4f 7/2 ) and 35.54 eV (W 5+ 4f 5/2 ) are obtained. 37,38 The atomic ratio of W 6+ to W 5+ to W 4+ was calculated to be 77.96:17.65:4.39, that is equal to W 5.735+ . Thus, the chemical formula can be written as H 0.265 WO 3 .…”

Section: Resultsmentioning

confidence: 99%

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (H_xMO₃) using Liquid Metal at Room Temperature

Cui

Liang

et al. 2019

ACS Omega

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This paper presents a new route to one-step fabrication and in situ application of hydrogen tungsten and molybdenum bronze (H x MO 3 ) at room temperature and triggers the interdisciplinary research of multifunctional materials between liquid metal and transition-metal oxides (TMOs). Gallium-based liquid metal (GBLM) enables the discoloration effect on TMOs in acid electrolytes at ambient temperature. The underlying mechanism behind this phenomenon can be ascribed to the redox effect at the interface of liquid metal and TMOs in acid electrolytes. Both the theoretical calculations and the experimental results demonstrate that the increasing intercalation of H + ions into the lattice of WO 3 raises the electron density at the Fermi level and charge carriers. H + ion content in the obtained H x MO 3 can be controlled in our approach to meet different requirements. Taking advantage of the one-step fabrication and room-temperature liquid phase nature of the liquid metal, H x MO 3 is synthesized under ambient conditions in a very short time, which is inaccessible with conventional solution-processed mechanical alloying, or other methods. The H x MO 3 obtained in this one-step approach enables convenient and simple applications for biomimetic camouflage, cost-effective energy storage, H + ion sensor, and electronic switch.

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Section: Resultsmentioning

confidence: 99%

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (H_xMO₃) using Liquid Metal at Room Temperature

Cui

Liang

et al. 2019

ACS Omega

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“…S4, the photocatalytic activity sequence of these films is FT/2KWO ~ P25 > FT + 2KWO > F-TiO 2 ’ ~ FT@2KWO > 2KWO@FT and the enhancement of the photocatalytic activity could be attributed to the close interfacial contact and strong interaction between F-TiO 2 and K x WO 3 in FT/2KWO film. Besides, the introduction of K x WO 3 with excellent electronic conductivity can promote the photogenerated electron transport to the surface of the composite more easily, thus inhibiting the recombination between photogenerated electrons and holes343738. However, when it comes to FT + 2KWO film and others, the F-TiO 2 and K x WO 3 are independent (see SEM image inset Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In these smart coatings, K x WO 3 plays a part in shielding most of NIR light and holding high Vis light transparency, while F-TiO 2 acts as both a photocatalyst to degrade harmful organic pollutants and a barrier to shield harmful ultraviolet light, which makes up the shortage of K x WO 3 in the UV region. It’s worth mentioning that the K x WO 3 nanorods were synthesized with Na 2 WO 4 as tungsten source instead of K 2 WO 4 , which is considered as a lower-cost way than previously reported method of preparing tungsten bronze powders1934. Furthermore, the heat-shielding and photocatalytic property of F-TiO 2 -K x WO 3 nanocomposite films were evaluated and compared with that of ITO or P25 film to find out the optimal ratio of K x WO 3 to F-TiO 2 with a synergistic effect.…”

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confidence: 99%

Smart window coating based on F-TiO2-KxWO3 nanocomposites with heat shielding, ultraviolet isolating, hydrophilic and photocatalytic performance

Liu

Wang

et al. 2016

Sci Rep

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A series of smart window coated multifunctional NIR shielding-photocatalytic films were fabricated successfully through KxWO3 and F-TiO2 in a low-cost and environmentally friendly process. Based on the synergistic effect of KxWO3 and F-TiO2, the optimal proportion of KxWO3 to F-TiO2 was investigated and the FT/2KWO nanocomposite film exhibited strong near-infrared, ultraviolet light shielding ability, good visible light transmittance, high photocatalytic activity and excellent hydrophilic capacity. This film exhibited better thermal insulation capacity than ITO and higher photocatalytic activity than P25. Meanwhile, the excellent stability of this film was examined by the cycle photocatalytic degradation and thermal insulation experiments. Overall, this work is expected to provide a possibility in integrating KxWO3 with F-TiO2, so as to obtain a multifunctional NIR shielding-photocatalytic nanocomposite film in helping solve the energy crisis and deteriorating environmental issues.

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“…In recent years, a group of vacancy-rich tungsten-based materials with the general formula of M x WO 3 (M = Na + , K + , Rb + , Cs + , NH 4 + , and so on) or WO 3-x have been fully investigated as electroconductive devices [30,31], electrochromic materials [32][33][34] and NIR-shielding films [35][36][37][38][39][40]. More importantly, these mixed valence state tungsten-based materials appear to be well-suited candidates for photocatalysis with various unique optical properties [41][42][43][44][45][46]: (1) the narrow bandgap energy promotes their strong UV and Vis-light absorption capacities; (2) the presence of the W 5+ ion accelerates the absorption of NIR light owing to the metastable state induced photosensitive effect and localized surface plasmonic resonance (LSPR).…”

Section: Introductionmentioning

confidence: 99%

Tungsten-based photocatalysts with UV–Vis–NIR photocatalytic capacity: progress and opportunity

Wang

Liu

et al. 2019

Tungsten

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Semiconductor photocatalysis is proven to be one of the potential approaches to solve energy crisis and environmental problems. Efficient solar energy utilization and superior charge carrier separation capacity are two crucial aspects in photocatalysis. Herein, the photocatalytic performances of the pristine and modified tungsten-based materials with mixed valence state are summarized concisely. The narrow band gap energy, coexistence of W 5+ /W 6+ and the oxygen vacancies all contribute to the pristine tungsten-based photocatalysts with unique ultraviolet (UV), visible (Vis), and near-infrared (NIR) light-induced photocatalytic activities. Furthermore, the enhanced localized surface plasmonic resonance (LSPR) effect, improved charge carrier separation efficiency and prolonged charge carrier lifetime all boost the performances of modified tungsten-based heterojunction photocatalysts. Moreover, multifunctional tungsten-based photocatalysts with mixed valence state are established to realize the full utilization of solar energy authentically. Concluding perspectives on the challenges and opportunities for the further exploration of tungsten-based photocatalysts are also presented.

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Graphene/MxWO3 (M=Na, K) nanohybrids with excellent electrical properties

Cited by 16 publications

References 38 publications

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (H_xMO₃) using Liquid Metal at Room Temperature

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (H_xMO₃) using Liquid Metal at Room Temperature

Smart window coating based on F-TiO2-KxWO3 nanocomposites with heat shielding, ultraviolet isolating, hydrophilic and photocatalytic performance

Tungsten-based photocatalysts with UV–Vis–NIR photocatalytic capacity: progress and opportunity

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Graphene/MxWO3 (M=Na, K) nanohybrids with excellent electrical properties

Cited by 16 publications

References 38 publications

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (HxMO3) using Liquid Metal at Room Temperature

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (HxMO3) using Liquid Metal at Room Temperature

Smart window coating based on F-TiO2-KxWO3 nanocomposites with heat shielding, ultraviolet isolating, hydrophilic and photocatalytic performance

Tungsten-based photocatalysts with UV–Vis–NIR photocatalytic capacity: progress and opportunity

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Product

Resources

About

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (H_xMO₃) using Liquid Metal at Room Temperature

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (H_xMO₃) using Liquid Metal at Room Temperature