Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 25
·7976-7981
·
IF 7.393
Xiankai Fu,Wanqi Chen,Xiaowen Hao,Zhimin Zhang,Ruolan Tang,Bo Yang,Xiang Zhao,Liang Zuo
This paper reports a new candidate material λ-Ti3O5 for microwave absorption. λ-Ti3O5 has been proposed to be metastable and has emerged at room temperature only in the form of nanocrystals. To prepare high purity λ-Ti3O5, the formation energies of 27 different elements doped into λ-Ti3O5 were calculated by first-principles from the energy point of view. It was found that Li has the strongest stabilizing effect on λ-Ti3O5. The prepared λ-Ti3O5 and Li/λ-Ti3O5 show good microwave absorption properties: the efficient absorption bandwidth of λ-Ti3O5 can reach 7.9 GHz at 1.7 mm thickness, and the efficient absorption bandwidth of Li/λ-Ti3O5 can reach 7.4 GHz at 1.2 mm thickness. In addition, we propose a strategy of using the number of states of the micro-electric field to predict the microwave absorption properties of materials, which is helpful to the understanding of the origin and development of microwave absorption.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
NATURE
·
2023
·Vol. 622
·期 7983
·499-506
·
IF 64.8
Yang Bo,Zhang Zhiming,Liu Peitao,Fu Xiankai,Wang Jiantao,Cao Yu,Tang Ruolan,Du Xiran,Chen Wanqi,Li Song,Yan Haile,Li Zongbin,Zhao Xiang,Qin Gaowu,Chen Xing-Qiu,Zuo Liang
Solar steam interfacial evaporation represents a promising strategy for seawater desalination and wastewater purification owing to its environmentally friendly character 1 , 2 , 3 . To improve the solar-to-steam generation, most previous efforts have focused on effectively harvesting solar energy over the full solar spectrum 4 , 5 , 6 , 7 . However, the importance of tuning joint densities of states in enhancing solar absorption of photothermal materials is less emphasized. Here we propose a route to greatly elevate joint densities of states by introducing a flat-band electronic structure. Our study reveals that metallic λ-Ti 3 O 5 powders show a high solar absorptivity of 96.4% due to Ti–Ti dimer-induced flat bands around the Fermi level. By incorporating them into three-dimensional porous hydrogel-based evaporators with a conical cavity, an unprecedentedly high evaporation rate of roughly 6.09 kilograms per square metre per hour is achieved for 3.5 weight percent saline water under 1 sun of irradiation without salt precipitation. Fundamentally, the Ti–Ti dimers and U-shaped groove structure exposed on the λ-Ti 3 O 5 surface facilitate the dissociation of adsorbed water molecules and benefit the interfacial water evaporation in the form of small clusters. The present work highlights the crucial roles of Ti–Ti dimer-induced flat bands in enchaining solar absorption and peculiar U-shaped grooves in promoting water dissociation, offering insights into access to cost-effective solar-to-steam generation.
研究领域:
材料科学
·
环境科学
·
能源科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Tingting Yuan,Yudong Wang,Na Jin,Jinwen Ye
Solar steam generation has attracted wide interest in desalination and sewage purification due to its cost-effectiveness and environmental friendliness. However, the low evaporation rate and energy utilization efficiency limit the further application of the evaporation system. In order to solve the above problems, a lot of efforts have been made in the development of new materials. With excellent semiconductor properties and photothermal performance, titanium suboxides (TinO2n−1) are considered as promising materials used as the photothermal conversion materials (PTCMs). However, less emphasis is placed on how crucial it is to adjust the grain size of TinO2n−1 in order to design the bandgap and improve evaporation performance. Therefore, in this work, we report a pathway to modulate the grain size and morphology to prepare nanolamellar λ-Ti3O5 (NL-T3). The tuned λ-Ti3O5 has a narrower bandgap and can thus generate more electron–hole pairs under solar irradiation, with up to 92.2% solar absorptivity and 91.7% photothermal conversion efficiency. And the lamellar morphology has a remarkably high specific surface area of 131.3 m2 g−1, which makes NL-T3 have superior hydrophilicity. Its application in a structurally optimized 3D evaporation system achieved an evaporation rate of 6.41 kg m−2 h−1 and superior cycling performance under long-term use. This study emphasizes the importance of modulation of morphology for semiconductor PTCMs and provides a theoretical basis for their subsequent efficient application in the solar field.
研究领域:
材料科学
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能源工程
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 14.3
Wanqi Chen,Ruolan Tang,Bo Yang,Wenzhao Sun,Bo Zhang,Peize Lv,Banghe Lv,Haile Yan,Zongbin Li,Song Li,Liang Zuo
The Magnéli-phase λ-Ti 3 O 5 , characterized by its unique flat-band electronic structure, is a promising photothermal conversion material for solar-driven interfacial evaporation. However, its intrinsic thermodynamic instability at ambient temperature severely constrains large-scale practical application. To overcome this challenge, we developed a scalable synthesis strategy for stabilizing λ-Ti 3 O 5 via arc-melting followed by high-energy ball milling, coupled with Lithium (Li) doping. Structural and surface analyses confirm that Li incorporation effectively stabilizes the λ-phase. Morphological studies reveal particle refinement (∼1–2 μm) with increased surface roughness and oxygen vacancies, further enhancing solar absorption with overall reflectivity < 6% in the range of 250–2500 nm. Incorporating 10 wt.% of Li 0.25 Ti 2.75 O 5 particles into a Polyvinyl alcohol/Polyvinylpyrrolidone (PVA/PVP) porous hydrogel evaporator yielded an evaporation rate of 5.22 kg m −2 h −1 under one sun irradiation. Remarkably, the evaporator demonstrated excellent resistance to salt crystallization, maintaining stable performance during a 24-h continuous operation in 3.5 wt.% saline water. This work not only provides a practical and scalable approach for stabilizing λ-Ti 3 O 5 but also offers valuable insights into the development of efficient, durable photothermal materials for solar desalination technologies.
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DOI
高影响因子
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