JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Daoguang Bi,Yangyang Li,Yingbang Yao,Tao Tao,Bo Liang,Shengguo Lu
Flexible photothermal devices have been extensively explored in a wide range of fields in recent years. In this work, a flexible photothermal nanocomposite film based on Ti 2 O 3 -PVA has been demonstrated for converting sunlight into thermal energy. Ti 2 O 3 nanoparticles were surfaced-modified by four kinds of different surfactants (γ–aminopropyltriethoxy Silane , Hexadecyl Trimethyl Ammonium Bromide, Stearic Acid, Polysorbate-80), respectively, and then the nanocomposites were prepared by a simple solution casting method. The flexible composite shows strong sunlight absorption in a wide spectrum range (300 nm–2000 nm). Under illumination of 5 kW/m 2 simulated sunlight, the nanocomposite can be quickly heated up to 64.1 °C. The nanocomposite presented stable performances after tens of bending tests, indicating good flexibility. Our results show that the nanocomposite with Ti 2 O 3 nanoparticles modified with Stearic Acid exhibits the strongest light absorption capability and thus the best photothermal effect. This flexible composite material may have promising potentials in the applications of photothermal energy harvesting devices for wearable electronics, solar-driven steam generators, or seawater desalinators etc.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2018
·Vol. 8
·期 9
·698
·
IF 1.704
Guobo Yang,Baoqiang Xu,Heli Wan,Fengkang Wang,Bin Yang,Zhijun Wang
The compound CaCl2plays a significant role in the process of direct calciothermic reduction of Ti2O3to prepare porous titanium. In this paper, the effect of CaCl2on reduction products by calciothermic reduction of Ti2O3was investigated. Results show that the distribution of CaCl2in reduction preform influences particle size and morphology differences in reduction products both on the surface and the inside. The CaCl2is transferred to the surface of the Ti2O3preform due to its volatilization before and throughout reduction. The content of CaCl2in the surface zone of Ti2O3preform is significantly higher than that in the interior during the reduction process, contributing to the formation of large Ti particles with a smooth shape on the surface, and small Ti particles with inherited morphology of Ti2O3inside. More CaCl2causes the aggregation of Ti particles to form large Ti particles which are advantageous as they connect and form a more solid porous titanium structure. The presence of a small amount of CaCl2in the interior also results in the coexistence of small Ti and CaO particles, forming a loose structure with uniform distribution.Keywords:CaCl2;calciothermic reduction;Ti2O3;microstructure;morphology;Ti particles
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Haijun Chen,Jie Liang,Li Li,Baozhan Zheng,Zhesheng Feng,Zhaoquan Xu,Yonglan Luo,Qian Liu,Xifeng Shi,Yang Liu,Shuyan Gao,Abdullah M. Asiri,Yan Wang,Qingquan Kong,Xuping Sun
Electrocatalytic nitrogen reduction reaction (NRR) enabled by introducing Ti3+ defect sites into TiO2 through a doping strategy has recently attracted widespread attention. However, the amount of Ti3+ ions is limited due to the low concentration of dopants. Herein, we propose Ti2O3 nanoparticles as a pure Ti3+ system that performs efficiently toward NH3 electrosynthesis under ambient conditions. This work has suggested that Ti3+ ions, as the main catalytically active sites, significantly increase the NRR activity. In an acidic electrolyte, Ti2O3 achieves extraordinary performance with a high NH3 yield and a Faradaic efficiency of 26.01 μg h–1 mg–1 cat. and 9.16%, respectively, which are superior to most titanium-based NRR catalysts recently reported. Significantly, it also demonstrates a stable NH3 yield in five consecutive cycles. Theoretical calculations uncovered that the enhanced electrocatalytic activity of Ti2O3 originated from Ti3+ active sites and significantly lowered the overpotential of the potential-determining step.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 14
·2125
·
IF 5.3
Tingting Hu,Panpan Feng,Liping Guo,Hongqi Chu,Fusheng Liu
A series of Ti2O3@TiO2core-shell heterojunction composite photocatalysts with different internal electric fields were synthesized using simple heat treatment methods. The synthesized Ti2O3@TiO2core-shell heterojunction composites were characterized by means of SEM, XRD, PL, UV–Vis, BET, SPV, TEM and other related analytical techniques. Tetracycline (TC) was used as the degradation target to evaluate the photocatalytic performance of the synthesized Ti2O3@TiO2core-shell heterojunction composites. The relevant test results show that the photocatalytic performance of the optimized materials has been significantly enhanced compared to Ti2O3, while the photocatalytic degradation rate has increased from 28% to 70.1%. After verification via several different testing and characterization techniques, the excellent catalytic performance is attributed to the efficient separation efficiency of the photogenerated charge carriers derived from the built-in electric field formed between Ti2O3and TiO2. When the recombination of electrons and holes is occupied, more charges are generated to reach the surface of the photocatalyst, thereby improving the photocatalytic degradation efficiency. Thus, this work provides a universal strategy to enhance the photocatalytic performance of Ti2O3by coupling it with TiO2to build an internal electric field.Keywords:photocatalysis;Ti2O3@TiO2core-shell heterojunction;built-in electric field
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Weixin Li,Wanqi Feng,Shixun Wu,Wei Wang,Dan Yu
Solar driven water evaporation is a promising clean water regeneration technology to solve the worldwide water shortage problem. The solar evaporators with efficient steam generation and multifunctional water purification capabilities are in great demand. Herein, inspired by concave mirror, a novel double-layer concave aerogel evaporator was developed by template-assisted method. In the upper layer, polydopamine modified Ti 2 O 3 nanoparticles and carbon nanotubes were used as photothermal materials was prepared with the concave structure to gain efficient solar energy absorption and energy conversion. In the lower layer, polyvinyl alcohol and chitosan were used as substrate in a double network with not only enhanced mechanical strength and good deformation resistance, but also excellent thermal management and water transport capacity of the evaporator. The as prepared evaporator has a high water evaporation rate of 1.81 kg m −2 h −1 and high water evaporation efficiency of 92.4% under one sun irradiation. In addition, it also showed the ability to purify heavy metal ions, acid, alkali and chemical dye contaminated wastewater, and considerable outdoor water purification capacity. This work will provide new ideas for the design of new solar evaporator with excellent photothermal conversion ability, and is expected to have broad application prospects in industrial processes such as water treatment and energy conversion.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Naike Shi,Xuyang Yan,Longlong Fan,Meng Xu,Yiming Yang,Mengzhe Hou,Takumi Nishikubo,Masaki Azuma,Jun Chen
Regulating and reducing the thermal expansion of materials has long been a challenge. In this study, a composite with negative thermal expansion (NTE) has been obtained by combining two intrinsically positive thermal expansion (PTE) materials—Ti 2 O 3 and SiC via microstructural effect. We have realized the successful retention and amplification of the microstructural effect of Ti 2 O 3 within the composite. The synchrotron X-ray computed tomography and mercury injection porosimeter reveals that the composite exhibits a unique pore distribution and enhanced porosity, enabling NTE properties that exceed theoretical predictions. This work provides a novel approach to transforming the intrinsic thermal expansion behavior of materials via microstructural effect, paving the way for innovative applications of NTE materials in precision engineering.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Zhongling Cheng,Yi Hu,Keshi Wu,Yusheng Xing,Peng Pan,Liyuan Jiang,Jieting Mao,Changke Ni,Zixi Wang,Mengmeng Zhang,Yaru Zhang,Xiaofeng Gu,Xiangwu Zhang
Silicon anodes are one of the most promising candidate materials for next-generation lithium-ion batteries because of their high theoretical capacity and natural abundance. Unfortunately, the poor conductivity of silicon and large volume expansion (>400%) during the cycle restrict its commercialization. Herein, we combine Si with stable TiO 2 and electrically conductive Ti 2 O 3 to significantly increase the capacity and cycle stability of the Si-based anodes. The preparation of a Si/TiO 2 /Ti 2 O 3 -Carbon Nanofiber (denoted as STTC) composite via mechanical blending, electrospinning and subsequent carbonization of Si, TiO 2 , and polyacrylonitrile (PAN). This material exhibits a reversible specific capacity of 924 mAh g −1 after 500 cycles of 1 A g −1 current density. Moreover, it also exhibits excellent rate performance even at current densities of 6 A g −1 . The outstanding electrochemical performance can be ascribed to Ti 2 O 3 generates in the carbonization process has high ion diffusivity and electrical conductivity. Furthermore, the disordered frame of TiO 2 /Ti 2 O 3 forms voids, which can alleviate the volume expansion of silicon, maintain the electrode integrity during charge and discharge, and form a thin and stable solid electrolyte interphase (SEI). Additionally, the conductive frame of carbon nanofibers also significantly improves the ion and electron conductivity of the complete electrode.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Lefan Li,Pengfei Zhao,Zhifen Wang,Zhang Hu,Di Wang,Yucang Zhang,Sidong Li,Chengpeng Li
Photothermal material is indispensable for the fabrication of solar steam generation with easy-manufacture, cost-effective, and high-performance. Here, Ti 2 O 3 /polyacrylamide/polyurethane foams (Ti 2 O 3 /PU/PAM) were rationally designed, applying the synergetic effects from ball-milled Ti 2 O 3 , hydrophilic PAM, and heat-retaining structure of PU foam. With virtues of reduced evaporation enthalpy, abundant water transport pathways, and effective thermal insulation , the resulting Ti 2 O 3 /PU/PAM photothermal foam exhibits a high evaporation rate of 2.15 kg m −2 h −1 and a water evaporation efficiency of 140.42 % under 1 sun (1 kW m −2 ). In addition, the results of this study can serve as a reference for highly efficient, green, and recyclable seawater desalination . It is envisioned that the results of this study provided a strategy to fabricate novel photothermal materials for highly efficient, clean, and long-term solar steam generation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Weixin Li,Hongwei Jian,Wei Wang,Dan Yu
To reduce the shortage of water resources, solar-driven water evaporation is considered as a sustainable solution. High efficiency solar steam generation (SSG) with the good light absorption , sufficient water transmission, high thermal management and freely floating photothermal materials is highly desirable. Herein, a simple solar desalination strategy was proposed and a new type three-dimensional Ti 2 O 3 -based aerogel with high porosity and low thermal conductivity was prepared. In short, polydopamine (PDA)-modified Ti 2 O 3 nanoparticles were uniformly dispersed in chitosan (CS) solution and a porous Ti 2 O 3 -based aerogel was formed after freeze-drying. The evaporation rate of this solar steam generator is as high as 1.31 kg m −2 h −1 at 1.0 solar irradiance (1.0 kW m −2 ), and the photothermal conversion efficiency is about 81.7%. The optical absorption at 250–2500 nm was 94.49%. In addition, the aerogel has a porosity of 97.50% and a density of 0.025 g cm −3 , making it freely float on the surface of water. Besides, its thermal conductivity is 0.037 W m −1 K −1 , indicating it has excellent thermal insulation performance. The porous Ti 2 O 3 -based aerogel can maintain stable evaporation rate and high evaporation efficiency after 10 repeated evaporation cycles. Additionally, the seawater after desalination was tested and the removal rates of ions and carbon-containing organic matter reached 99.80% and 75.45%, respectively. Therefore, the interfacial water evaporator prepared in this work has excellent photothermal conversion ability and is expected to be a candidate material for solar seawater desalination.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2026
·
IF 7.5
Luhan Zheng,Mengya Shang,Airong Wang,Xiaxuan Jia,Huixing Gao,Junzhuang Li,Jiahui Yu,Jin peng
Energy time decoupling aerogel for 24 h solar desalination by photothermal PCM storage. • 91% solar absorption, 55.3 °C surface temp, 71.05 J·g −1 latent heat and excellent stability. • It has a high evaporation rate of 1.88 kg m −2 h −1 with stable cycling and salt rejection. • This work presents a viable strategy for all-day solar desalination. Interfacial solar vapor generation holds great promise for sustainable freshwater production but is fundamentally limited by the intermittent nature of sunlight. To overcome this challenge, we developed a novel composite aerogel integrating photothermal conversion and latent heat storage for continuous desalination. The aerogel was fabricated by incorporating Ti 2 O 3 nanoparticles as the photothermal medium and polyethylene glycol (PEG) as the phase-change material into a PVA/CNF scaffold via freeze-drying. Excess heat is stored during peak irradiation and released during low or no-light periods, thereby decoupling evaporation performance from direct sunlight availability. The composite aerogel achieves a broadband solar absorption of 91% and attains a surface temperature of 55.3 °C under 1 sun. It delivers a high evaporation rate of 1.88 kg m −2 h −1 and demonstrates excellent cyclic stability and salt/bacteria resistance. Outdoor experiments demonstrated its practical viability, yielding a freshwater production of 3.661 L m −2 over ten hours. This work provides a feasible material strategy for all-day solar desalination and opens avenues for efficient solar-thermal energy utilization in water purification applications.
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Xule Pei,Tong Zhang,Jingyi Zhong,Zaihao Chen,Chuanjia Jiang,Wei Chen
Oxygen-deficient substoichiometric titanium oxides, or “titanium suboxides,” are produced incidentally from coal combustion and are environmentally abundant. Additionally, titanium suboxide nanomaterials are promising new materials with likely future environmental release. How these materials may affect contaminant fate differently than stoichiometric TiO 2 (nano)materials is largely unknown. Here, we show that Ti 2 O 3 (selected as a model titanium suboxide) exhibits significantly greater efficiency in enhancing the hydrolysis of 1,1,2,2-tetrachloroethane (TeCA), a common groundwater contaminant, than the stoichiometric anatase and rutile TiO 2 . At environmentally relevant pH (6.5–7.5), the surface area-normalized pseudo-first-order hydrolysis rate constant in the presence of Ti 2 O 3 is approximately an order of magnitude higher than those associated with TiO 2 . The superior catalytic efficiency of Ti 2 O 3 can be attributed to both its higher surface hydrophobicity , which renders higher adsorption affinity for TeCA, and its higher concentration of Lewis acid sites (mainly the Ti 3+ and the five-coordinated Ti 4+ ). Particularly, the deprotonated hydroxyl groups attached to Ti 3+ (a weaker Lewis acid than Ti 4+ ) exhibit higher basicity and thus, are more effective in catalyzing the base-promoted hydrolysis reaction. The findings call for further understanding of the environmental implications of titanium suboxide (nano)materials, which may not be readily predictable based on the knowledge acquired for TiO 2 .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Wenxin Yang,Dongxue Han,Zhonghui Sun,Zhishan Liang,ziqian He
Ascorbic acid (AA) is a very common and important antioxidant, widely present in various daily foods, and more importantly, it is an indispensable vitamin in the human body. In this study, a 980 nm near-infrared (NIR)-driven Ti₂O₃-TiO₂-based photoelectrochemical (PEC) sensor was developed for the selective and sensitive detection of AA. Upon 980 nm irradiation, a heterojunction is established between the tetravalent (Ti⁴⁺) and trivalent (Ti⁺) titanium oxides in the Ti₂O₃-TiO₂ photoactive semiconductor. This heterojunction enhances the separation of photogenerated electron-hole pairs and accelerates electron transport. Due to its low redox potential, AA can reduce Ti⁴⁺ to Ti3+, leading to a reversal in the direction of photogenerated electron flow within the semiconductor. The material changes from an n-type semiconductor to a p-type semiconductor, resulting in the phenomenon of photocurrent polarity reversal in PEC only in the presence of AA. At the same time, the sensor has a wide detection range of 1 - 302 μM for AA and the detection limit is 0.43 μM. All of these make it possible to use it for the detection of AA content in real rat cerebrospinal fluid and human plasma, with high recovery rates and low relative standard deviations. This approach holds great potential as an accurate and convenient method for medical detection of AA levels in the human body.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）