Nanomaterials
·
2021
·Vol. 11
·期 11
·2801
·
IF 5.076
Guang Feng,Mengyun Hu,Shuai Yuan,Junyi Nan,Heping Zeng
Hydrogenated crystalline TiO2with oxygen vacancy (OV) defect has been broadly investigated in recent years. Different from crystalline TiO2, hydrogenated amorphous TiO2−xfor advanced photocatalytic applications is scarcely reported. In this work, we prepared hydrogenated amorphous TiO2−x(HA-TiO2−x) using a unique liquid plasma hydrogenation strategy, and demonstrated its highly visible-light photoactivity. Density functional theory combined with comprehensive analyses was to gain fundamental understanding of the correlation among the OVconcentration, electronic band structure, photon capturing, reactive oxygen species (ROS) generation, and photocatalytic activity. One important finding was that the narrower the bandgap HA-TiO2−xpossessed, the higher photocatalytic efficiency it exhibited. Given the narrow bandgap and extraordinary visible-light absorption, HA-TiO2−xshowed excellent visible-light photodegradation in rhodamine B (98.7%), methylene blue (99.85%), and theophylline (99.87) within two hours, as well as long-term stability. The total organic carbon (TOC) removal rates of rhodamine B, methylene blue, and theophylline were measured to 55%, 61.8%, and 50.7%, respectively, which indicated that HA-TiO2−xexhibited high wastewater purification performance. This study provided a direct and effective hydrogenation method to produce reduced amorphous TiO2−xwhich has great potential in practical environmental remediation.Keywords:hydrogenated TiO2−x;oxygen vacancy;hydrogenation;liquid plasma;band structure
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materiomics
·
2017
·
IF 0
Haiqiang Liu,Hongan Ma,Taichao Su,Yuewen Zhang,Bing Sun,Binwu Liu,Lingjiao Kong,Baomin Liu,Xiaopeng Jia
We present the work about the initiative fabrication of multi-scale hierarchical TiO 2-x by our strategy, combining high pressure and high temperature (HPHT) reactive sintering with appropriate ratio of coarse Ti to nanosized TiO 2 . Ubiquitous lattice defects engineering has also been achieved in our samples by HPHT. The thermoelectric performance was significantly enhanced, and rather low thermal conductivity (1.60 W m −1 K −1 ) for titanium oxide was reported here for TiO 1.76 . Correspondingly, a high dimensionless figure of merit ( zT ) up to 0.33 at 700 °C was realized in it. As far as we know, this value is an enhancement of 43% of the ever best result about nonstoichiometric TiO 2 and the result is also exciting for oxide thermoelectric materials. The moderate power factor, the significantly reduced thermal conductivity and the remarkable synergy between electrical properties and thermal conductivity are responsible for the excellent thermoelectric performance. We develop a facile strategy for preparing multi-scale hierarchical TiO 2-x and its superior ability to optimize thermoelectric performance has been demonstrated here.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dongsheng Zhang,Meijiao Wang,Guosong Wei,Renjie Li,Ning Wang,Xiaolong Yang,Zhuo Li,Yan Zhang,Yanhua Peng
Photocatalytic H 2 evolution provides an upcoming route for the production of clean fuel via the conversion of solar energy. TiO 2 , as a potential semiconductor material, is restricted by its faint absorption of visible light, thus limiting its application in water splitting. Herein, high visible light responsive ZnIn 2 S 4 /TiO 2-x nanotube arrays for photocatalytic hydrogen evolution were fabricated by two-step reaction. ZnIn 2 S 4 /TiO 2-x nanotube arrays exhibited the photo response from UV to visible-light region due to the introduction of oxygen vacancies and visible-light driven ZnIn 2 S 4 . Moreover, the heterojunction improved the separation of photogenerated carriers and boosted the electron transfer from ZnIn 2 S 4 to TiO 2-x , thereby increasing the longevity of active electrons, which enhanced the photocatalytic activity for hydrogen evolution. An outstanding H 2 production rate of 581.1 μmol h −1 g −1 was obtained and an apparent quantum yield (AQY) up to ∼ 1.42% was achieved. This work demonstrates that the defect-induced bandgap engineering of semiconductor photocatalysts is a potential way to extend the optical absorption property of TiO 2 to visible light even or NIR and enhance the photocatalytic activity.
研究领域:
材料科学
·
能源转换与存储
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 4
·1176-1186
·
IF 7
Yue Xu,Yang Li,Yong Qian,Shanshan Sun,Ning Lin,Yitai Qian
Silicon monoxide (SiO) is regarded as a promising material to replace traditional graphite anode in the next generation lithium-ion batteries. However, the huge volume expansion and poor ionic/electronic conductivity of SiO particles largely restrict its application in the fast charging and discharging process. Herein, a deficient TiO2−x coated porous SiO structure was designed through the Ag-assisted chemical etching process followed by a hydrolysis approach. Within this composite, the internal pores of SiO particles could accommodate the irregular volume change and also shorten the diffusion pathway of lithium ions. Moreover, the outer TiO2−x could provide a protective shell and favor the generation of stable SEI films. In addition, the large specific surface area increases surface active sites and promotes the electrochemical reaction of lithium ions during the high-rate lithiation/de-lithiation process. As a result, the synthesized porous SiO/TiO2−x composites delivered a high capacity of 501.2 mA h g−1 with a capacity retention of 52.41% at a current density of 1.0 A g−1 after 300 cycles. Even at 2.0 A g−1, it maintained a reversible capacity of 423.4 mA h g−1 after 500 cycles. Finally, a full cell composed of porous SiO/TiO2−x composites and commercial LiCoO2 presented a distinctive enhancement in energy density compared with that of a pure SiO anode. A series of characterization analyses and electrochemical measurements were performed to disclose the mechanism for the superb performance of materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Jianxin Liu,Fangxia Xie,Rui Li,Tan Li,Zehui Jia,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
A novel TiO 2-x /Ag 3 PO 4 composite photocatalyst with controllable oxygen vacancies (V o ·) amount was designedly prepared to avoid the photocorrosion and promote reduction capacity of Ag 3 PO 4 photocatalyst. The V o · on TiO 2-x work as molecular oxygen activation center trapping electron and O 2 to form ·O 2 - , and then avoided the electrons combine with h + and/or Ag + . Compared with Ag 3 PO 4 , TiO 2-x , and TiO 2 /Ag 3 PO 4 , TiO 2-x /Ag 3 PO 4 showed obviously efficient visible light and natural indoor weak light photocatalytic activity and stability for the photodegradation of Bisphenol A (BPA). The photoelectric conversion spectra, Ag 3d XPS narrow scan spectra, ESR DMPO-·O 2 - species spectra revealed that the TiO 2-x /Ag 3 PO 4 had a higher photocurrent density, lower photocorrosion and more generation of superoxide radical than those of Ag 3 PO 4 . Interestingly, compare with single h + degradation pathway over Ag 3 PO 4 , the h + and ·O 2 - synergistic degradation pathway over TiO 2-x /Ag 3 PO 4 is more beneficial to the BPA degradation. This work highlights the relations between the photocatalyst structure, active species and pollutant degradation pathway.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2022
·
IF 4.458
Li Gao,Dujiang Lu,Yinghui Yang,Rongzhang Guan,Dongmei Zhang,Chenyi Sun,Shuai Liu,Xiufang Bian
A simple synthesis has been proposed for seaweed-like amorphous TiO 2-x modified Sb (a-TiO 2-x /Sb) composite nanowires as sodium-ion battery (SIBs) anodes by a dealloying method of Al-Sb-Ti alloys. Compared with other conventional methods, this method has the advantages of simple preparation, high yield and easy large-scale synthesis. It is excitingly discovered that a-TiO 2-x /Sb effectively alleviates volume changes and stabilizes the solid electrolyte interface (SEI). The a-TiO 2-x /Sb nanowires electrodes deliver outstanding electrochemical performance based on the synergistic effects, exhibiting a high reversible capacity of 591.9 mA h g −1 at 100 mA g −1 , stable cycling performance with a high capacity retention of 96.4% after 200 cycles and superior rate capability 382.2 mA h g −1 at 10,000 mA g −1 , which is very competitive among the reported Sb-based anodes.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 39
·24144-24155
·
IF 3.361
Xingdong Yang,Jiyan Qu,Linxi Wang,Jianhong Luo
In an attempt to realize the efficient treatment of NOx, a mixed catalyst of Ti3+ self-doped TiO2−x and γ-Al2O3 was constructed by reducing commercial TiO2. The degradation effect on NOx was evaluated by introducing the mixed catalyst into a coaxial dual-dielectric barrier reactor. It was found that the synthesized TiO2−x could achieve considerable degradation effects (84.84%, SIE = 401.27 J L−1) in a plasma catalytic system under oxygen-rich conditions, which were better than those of TiO2 (73.99%) or a single plasma degradation process (26.00%). The presence of Ti3+ and oxygen vacancies in TiO2−x resulted in a relatively narrow band gap, which contributed to catalyzing deeply the oxidation of NOx to NO2− and NO3− during the plasma-induced “pseudo-photocatalysis” process. Meanwhile, the TiO2−x showed an improved discharge current and promoted discharge efficiency, explaining its significant activation effect in the reaction. Reduced TiO2−x could achieve an impressive degradation effect in a long-time plasma-catalysis process, and still maintained its intrinsic crystal structure and morphology. This work provides a facile synthesis procedure for preparing Ti3+ self-doped TiO2−x with practical and scalable production potential; moreover, the novel combination with plasma also provides new insights into the low-temperature degradation of NOx.
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
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chang Liu,Pengcheng Wu,Jianning Wu,Juan Hou,Hongcun Bai,Zhiyong Liu
Carbon layer coated black TiO 2−x /g-C 3 N 4 nanosheets (C@TiO 2−x /CNNS) heterojunction photocatalysts were successfully prepared via a polydopamine dopamine carbonization route for the first time. It was found that the hydrogen evolution rate of C@TiO 2−x /CNNS was 417.2 μmol h −1 g −1 under visible light irradiation, which was much higher than that of other prepared photocatalysts in solar water splitting process at the same conditions, and obvious decrease in catalytic activity can be observed after three recycles. The formation of carbon layer on the surface of TiO 2−x can effectively protect Ti 3+ and oxygen vacancies (O vs ) from oxidation by air and dissolved O 2 , afterwards much more Ti 3+ /O vs are exsited, which can serve as charge carrier traps to inhibit the recombination of light-excited electrons-holes. Therefore, C@TiO 2−x /CNNS showed a highly conductivity, rapidly effective electron-hole separation and lower transmission resistance comprehensive consideration of the advantages of carbon layer and hetero-junction, which are of great benefit to the improvement of photocatalytic performance. Hence, a new catalytic tactic namely layer-protection effect was founded and this strategy for boosting hydrogen evolution and protection Ti 3+ /O vs may give us some hints on the design of photocatalytic systems.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yulei Sui,Bingjue Wang,Zhihao Shi,Xiaoping Zhang,Xiang Gao,Shengkui Zhong,Yu Xia,Ling Wu
With the proposal of carbon peaking and carbon neutrality goals, clean energy storage is attracting more and more attentions. In view of the lack of lithium resource in our earth, sodium-ion batteries are considered as the emerging and promising next-generation energy storage devices. Appropriate high-performance anode materials play a vital role in the development of sodium-ion batteries. Here, a core-shell hollow Ni-Co-P nanopolyhedron interconnected by oxygen defect TiO 2 (Ni-Co-P@TiO 2- x ) is reported, which is synthesized by ion etching-hydrolysis and subsequent phosphatization/hydrogenation treatment using ZIF-67 as template and hybrid carbon source. The achieved Ni-Co-P@TiO 2- x material has several distinct advantages including hollow core-shell structure, flexible conductive carbon matrix, stable electroactive coating layer, and efficient pseudocapacitive behavior, resulting in high reversible capacities, remarkable rate capability and excellent cycle stability. The synergetic battery-capacitor characteristic of Ni-Co-P@TiO 2- x material makes it become a promising anode for sodium-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Jiaojiao Jiang,Zipeng Xing,Meng Li,Zhenzi Li,Junwei Yin,Junyan Kuang,Jinlong Zou,Qi Zhu,Wei Zhou
Plasmon Ag decorated 3D urchinlike N-TiO 2−x photocatalysts are successfully synthesized by a facile hydrothermal treatment (180 °C) and combined with a photo-deposition approach, followed by a reduction treatment. The results show that the resultant Ag/N-TiO 2−x sample possesses a three-dimensional (3D) urchinlike nanostructure with high crystallinity of anatase. Meanwhile, it exhibits the narrow optical band gap (Eg ∼ 2.61 eV) and the excellent visible-light-driven photocatalytic performance. Moreover, the hydrogen generation rate and photocatalytic degradation rate of phenol are up to 186.2 μmol h −1 g −1 and 97.7% under visible light irradiation, which are about 4.2 and 5.4 folds greater than that of N-TiO 2 . The mechanism of photocatalytic process is also proposed, and the enhanced photocatalytic property is mainly due to the synergistic reaction of the Ti 3+ and N codoping, which narrows the band gap and favors the utilization of visible light, and the plasmon effect of Ag nanoparticles and unique 3D urchinlike architecture, which are propitious to the separation and transmission of photogenerated carriers.
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
CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Wei Guo,Fei Wang,Dandan Ding,Chuanqi Song,Chongshen Guo,Shaoqin Liu
Integration of cancer diagnosis and treatment, namely theranostics, is an important issue in the biomedical field. Benefiting from an excellent photothermal effect, ROS generation ability, and the desired mesoporous structure of the TiO2–x matrix, we strategically designed and fabricated a TiO2–x based theranostic system for realizing fluorescence/photoacoustic tomography (PAT) bimodal imaging guided triple therapy for photothemal/photodynamic/chemotherapy in this work. Nonstoichiometric TiO2–x nanospheres are excellent near-infrared absorptive material, which takes on both photosensitizer and photothermal agent roles in implementing PDT/PTT combination therapy and PAT imaging. Moreover, the mesoporous structure of TiO2–x also allowed drug loading, and the polydopamine sealing layer enabled it to induce NIR/pH-triggered drug controlled release. Resultantly, both the in vitro and in vivo experiment manifested the remarkable tumor inhibition and tumor imaging effects by the TiO2–x based theranostic system. The antitumor mechanism was attributable to a synergistic therapeutic effect (combination index = 0.318) of DOX-induced DNA damage, and PDT/PTT caused mitochondrial dysfunction and a change in the cell membrane permeability. Innovatively, the B-mode ultrasonography was adopted to monitor the rehabilitation process at the solid tumor site after treatment, which observed a liquefaction necrosis process.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Lianying Lu,Guohong Wang,Ziwei Xiong,Zifei Hu,Yuwei Liao,Juan Wang,Jun Li
A heterojunction of plasmonic Ag particles on Ti 3+ -doped macro-/meso-porous TiO 2 framework consisting of parallel microchannels, denoted as Ag/TiO 2- x , has been fabricated by a simple microwave-assisted process employing vitamin C as the reducing agent for forming TiO 2- x framework followed by photochemical deposition of Ag particles. Charge transport and recombination processes were detected through transient photocurrent responses. The visible-light photocatalytic hydrogen production rate and the apparent reaction rate constant of RhB photodegradation with 3%-Ag/TiO 2- x catalyst are about 5.3 and 14.0 fold higher than those with the pristine macro-/meso-porous TiO 2 framework, respectively. A mechanism based on the synergistic effects of Ag plasmonics and Ti 3+ -doping at the Ag/TiO 2- x heterojunction is proposed, which consistently explains the high photocatalytic performance in hydrogen evolution and the improved photocatalytic decomposition of RhB under visible light. This study demonstrates the effective route to synthesize new heterojunction photocatalytic materials with multifunctional properties using low-cost and rapid microwave processes.
研究领域:
材料科学
·
环境科学
✓ 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）