SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Peng Wang,Tong Song,Guanggang Gao,Katarzyna Matras-Postolek,Ping Yang
SnO 2 clusters were embedded in superior thin TiO 2 nanosheets to form heterostructures via a two-step solvothermal synthesis . Superior thin TiO 2 (B) nanosheets were firstly prepared, in which these nanosheets exhibited homogeneously sheet structure without aggregation. After deposition of SnO 2 clusters, the mixture phase consisted of anatase and TiO 2 (B) was obtained even though the nanosheet morphology remained unchanged. The ratio of SnO 2 and TiO 2 was adjusted to get enhanced gas sensing performance. The gas sensing activity of samples for volatile organic compounds including acetone, ethanol and triethylamine was tested. Results indicates that SnO 2 /TiO 2 heterostructure with an optimal SnO 2 weight ratio of 10% is remarkably responsive to acetone, ethanol and triethylamine . Especially, the response time to triethylamine is only 10 s. In the case of 2 ppm, the sample still revealed a significant response to triethylamine. The enhanced sensing performance has to ascribed to the significant increase of reactive active sites by loading SnO 2 clusters. In addition, ultra-thin morphology and mixed phase composition of TiO 2 also enhance the property of the composite. This work supplied an idea for the preparation of SnO 2 based gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hongqiang Shen,DanDan Shang,Longhua Li,Di Li,Weidong Shi
Full solar-energy utilization and sufficient charge flow supply are highly desired for the rational design over efficient heterojunction photocatalyst. Herein, we introduced 2D Schiff-base covalent-organic frameworks material (COF-TpPa-1) as a photosensitizer and support to integrate with 2D TiO 2 nanosheets of H 2 -evolving semiconductor, establishing a 2D/2D hybrid photosensitive system. The 2D/2D COF-TpPa-1/TiO 2 heterogeneous composite displayed the optimum yield of 1.37 mmol h −1 g −1 under visible light irradiation, which is ∼ 29 times higher than that of pristine COF-TpPa-1. Furthermore, the mass short-distance photoelectron flow through the intimate hetero-interface contact between 2D COF-TpPa-1 and 2D TiO 2 has been evidenced by various characterizations and DFT calculations. This work reported here enables the extension of various 2D/2D hybrid collocations between H 2 -evolving metal oxide semiconductors and photosensitizing COF materials for boosting photocatalytic performance.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Wenwu Fu,Yaoting Li,Mao-sung Chen,Yanjie Hu,Bingheng Liu,Kai Zhang,Chenyang Zhan,Ming Zhang,Zhongrong Shen
Poor rate capability and cyclability are the major barriers to using TiO 2 as the next generation anode material for high-performance lithium-ion batteries. In this study, a sandwich-like composite consisting of atomically defined two-dimensional (2D) carbon nanosheet is constructed by the confined synthesis in the galleries of layered TiO 2 nanosheet with the superior cycling and rate performances as the anode material for lithium-ion batteries. It is first experimentally revealed that the interfacial charge storage between unilamellar TiO 2 nanosheet and carbon nanosheet in the Carbon/TiO 2 nanosheet stack and the excellent structure stability during the discharge/charge process contribute to the superior performance of the composites. The resultant composite exhibits a high specific capacity (568 mAh g −1 ) with a specific energy of 407.4 Wh kg −1 at a specific power of 71.7 W kg −1 , and remains 88.0 Wh kg −1 at a specific power of 9.0 kW kg −1 . Apart from promising lithium-ion battery anode, this 2D Carbon/TiO 2 composite also has immense potential for applications in other areas such as sodium/potassium-ion batteries, supercapacitor , and catalysis.
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
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yunfang Ji,Wei Guo,Huihui Chen,Longshuai Zhang,Song Chen,Mutian Hua,Yuhan Long,Zhuo Chen
Constructing unique nanocomposites to facilitate charge transfer and promote catalytic activity provides a promising approach for enhancing solar-to-hydrogen efficiency. However, revealing the catalytic surface state and understanding their roles in the photocatalytic process remain elusive. Here, we develop a facile and mild solution method for ultrathin TiO2 nanosheets with a large specific surface area and enhanced surface Ti3+ accumulation. Moreover, we demonstrate a hybrid nanosystem composed of ultrathin 2D TiO2 nanosheets directly coupled with 0D CdSe QDs for hydrogen generation. The 0D CdSe QDs increase visible light absorption ability after being coupled with the TiO2 nanosheets. Owing to the synergistic effect between the quantum dots and nanosheets, the apparent quantum efficiency increases to 45% at 380 and 450 nm, and the H2 evolution exhibits a 10-fold enhancement. EPR results indicate that the surface Ti3+ greatly promotes H free radical production due to the redox couple Ti3+/Ti4+ providing an efficient route for the photoexcited electron–hole separation. Our findings provide new insights toward understanding and exploiting highly efficient photocatalyst.
研究领域:
材料科学
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能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jianing Li,Qiancheng Zhang,Juming Liu,Mengran Yu,Huiyan Ma,Jucai Yang,Sheng Ye,Tomas Ramirez Reina,Jian Liu
It still remains challenge for expanding the photo-response range of TiO 2 with dominant {0 0 1} facets due to the hardly achieving modification of the electronic structure without destroying the formation of TiO 2 high energy facets. Herein, we report the construction of carboxylate species modified TiO 2 nanosheets with dominant {0 0 1} facets by employing ethanol as a carbon source through a low-temperature (300 °C) carbonization method. The as-obtained samples were investigated in detail by using various characterization techniques. The results indicate that the carboxylate species derived from the oxidation and carbonization of ethanol are coordinated to the {0 0 1} facets in a bidentate bridging mode. The electron-withdrawing carboxylate species induce TiO 2 to form a lower valence band edge and a narrower bandgap, which enhances the oxidation ability of photogenerated holes and expands the photo-response range. The partially carbonized carboxylate species can also act as a photosensitizer to induce visible-light photocatalytic activity of TiO 2 nanosheets. In addition, the carboxylate species can further promote the separation of photogenerated charge carriers. The findings of this work may provide a new perspective for tuning the band structure of TiO 2 with dominant {0 0 1} facets and improving its photocatalytic performance.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
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IF 7.504
Lei Jiang,Lei Sun,Dong Yang,Jian Zhang,Ya-Juan Li,Kun Zou,Wei-Qiao Deng
TiO2 nanocrystals with different reactive facets have attracted extensive interest since they were first synthesized. The anatase TiO2 nanocrystals with (001) or (100) dominate facets were considered to be excellent electrode materials to enhance the cell performance of dye-sensitized solar cells. However, which reactive facet presents the best surface for benefiting photovoltaic effect is still unknown. We report a systematic study of various anatase TiO2 surfaces interacting with N719 dye by means of density functional theory calculations in combination with microscopic techniques. The (001) surface interacting with N719 would have the lowest work function, leading to the best photovoltaic performances. To further increase the efficiency, Nb dopant was incorporated into the anatase TiO2 nanocrystals. Based on the theoretical prediction, we proposed and demonstrated novel Nb-doped (001)-dominated anatase TiO2 nanosheets as photoelectrode in a dye-sensitized solar cell to further enhance the open-circuit voltage. And a power conversion efficiency of 10% was achieved, which was 22% higher than that of the undoped device (P25 as an electrode).
研究领域:
材料科学
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能源科学
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理论计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 10
·3476-3482
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IF 7.059
Jiaxing Wu,Panzhe Qiao,Haoze Li,Yachao Xu,Wutao Yang,Fan Yang,Kuo Lin,Kai Pan,Wei Zhou
Two-dimensional (2D) ultrathin mesoporous anatase TiO2 nanosheets with engineered surface defects (SDUATNs) are prepared by evaporation-induced self-assembly, solvothermal and surface hydrogenation reduction strategies. The as-prepared SDUATNs possess a comparatively large specific surface area of 100.4 m2 g−1, a main pore size of 9.7 nm, and a pore volume of 0.36 cm3 g−1. After surface hydrogenation, the narrowed bandgap of 2.97 eV expands the photoresponse from the ultraviolet to the visible-light region as a result of efficient surface defect engineering. The SDUATNs exhibit excellent photocatalytic hydrogen production performance (3.73 mmol h−1 g−1), which is about 3-fold higher than that of pristine ultrathin mesoporous anatase TiO2 nanosheets (1.31 mmol h−1 g−1) under AM 1.5G irradiation. The improvement of the hydrogen evolution performance is attributed to the efficient engineered surface defects and the special 2D ultrathin structure reducing the bandgap, increasing sunlight utilization, providing adequate surface active sites, shortening the migration distance of charge carriers and thus favoring the spatial separation of photogenerated electron–hole pairs. The high stability also favors practical applications. This work presents new insight to enhance the photocatalytic performance and may provide valuable ideas to fabricate other high-performance 2D photocatalysts.
研究领域:
材料科学
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能源化学
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环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 56
·50506-50512
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IF 3.289
Kaifu Zhang,Wei Zhou,Xiangcheng Zhang,Yang Qu,Lei Wang,Weiyao Hu,Kai Pan,Mingxia Li,Ying Xie,Baojiang Jiang,Guohui Tian
Stable mesoporous black anatase TiO2 nanosheets (MBTNs) are synthesized via an earth-abundant low-cost biotemplate method combined with an ethanediamine encircling process, and subsequent high-temperature calcinations and surface hydrogenation. The MBTNs, which can be synthesized on a large scale with a low cost, are composed of Ti3+ in frameworks and surface disorders. In this case, the employment of ethanediamine encircling plays a vital role in fabricating the stable MBTNs, and not only favors high-temperature hydrogenation (600 °C), but also retains the mesoporous network as well as inhibiting the anatase-to-rutile phase transformation and grain growth. The resultant MBTNs possess a relatively high surface area of ∼74 m2 g−1, and large pore size and pore volume of ∼10 nm and 0.15 cm3 g−1, respectively. The MBTNs, with a narrow bandgap of ∼2.85 eV, can extend the photoresponse from the ultraviolet to visible light region, and exhibit an excellent solar-driven photocatalytic hydrogen evolution rate (∼165 μmol h−1 0.05 g−1), which is about twice as high as that of pristine mesoporous TiO2 nanosheets (∼82 μmol h−1 0.05 g−1). This efficient solar-driven photocatalytic hydrogen evolution is ascribed to the synergistic effects of the highly crystalline, ultrathin 2D mesoporous structure of Ti3+ in frameworks and surface disorders.
研究领域:
材料科学
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能源科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 14
·5543-5553
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IF 5.287
Xin Zhao,Lei Huang,Supawadee Namuangruk,Hang Hu,Xiaonan Hu,Liyi Shi,Dengsong Zhang
A novel Zr–CeVO4/TiO2 catalyst was developed for the selective catalytic reduction (SCR) of NO with NH3. Both TiO2 nanosheets (TiO2-NS) and nanoparticles (TiO2-NP) with different crystal facets were used as supports for the catalyst. It was found that the TiO2-NS-supported catalyst showed much better activity, stability and H2O/SO2 durability than the TiO2-NP-supported catalyst. In particular, the catalyst loading amount was much lower than those of previously reported vanadate-based SCR catalysts. The crystal structures and morphologies were analysed by X-ray diffraction (XRD), Raman spectroscopy and (high-resolution) transmission electron microscopy ((HR)TEM). The redox properties, surface active species and acid sites of the catalysts were investigated through hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), ammonia and nitrogen oxide temperature-programmed desorption (NH3-TPD and NOx-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTs) experiments. The improved activity at lower temperature was due to the presence of more active oxygen species and Brønsted acid sites, as well as the formation of NO2 on the surface of the TiO2 nanosheets which have exposed (001) facets. The enhanced stability and H2O/SO2 durability of Zr–CeVO4/TiO2-NS was due to the limited formation of NH4NO3 and (NH4)2SO4/NH4HSO4. The excellent low operation temperature, low vanadium content and absence of WO3(MoO3) in this catalyst indicated that it has promising potential as a SCR catalyst for practical applications.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhiang Hou,Hao Chen,Jiangfeng Chu,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
Herein, the bimetallic Pd 3 In 1 alloy were deposited onto the crystal facet engineered TiO 2 nanosheet (NS) via one-step photoreduction (Pd 3 In 1 /TiO 2 -NS) for selective conversion of nitrate (NO 3 − ) to N 2 . Bimetallic Pd 3 In 1 provides higher affinity sites to bind NO 3 − and significantly reduces the energy barrier of the rate-limiting step (NO 3 * + e − → NO 2 *), which is the key for the ultra-fast NO 3 − reduction kinetics. More importantly, the synergistic effect of Pd and In not only suppresses the hydrogen evolution reaction resulting in high efficiency utilization of photogenerated electrons, but also promotes the selective conversion of nitrite (NO 2 − ) to N 2 . Consequently, Pd 3 In 1 /TiO 2 -NS exhibits 100 % NO 3 − conversion and 90 % N 2 selectivity within 20 min in six cycles. One order of magnitude improvement on the NO 3 − reduction kinetic constants of Pd 3 In 1 /TiO 2 -NS (0.254 min −1 ) is achieved compared with pristine TiO 2 -NS and monometallic loaded ones. This work provides new insights into the rational construction of bimetallic alloy cocatalysts for high-efficiency photocatalytic denitrification.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiu-Xiang Yang,Wen-Bei Yu,Chao-Fan Li,Wen-Da Dong,Li-Qi Jiang,Na Zhou,Zhi-Peng Zhuang,Jing Liu,Zhi-Yi Hu,Heng Zhao,Yu Li,Lihua Chen,Jinguang Hu,Bao-Lian Su
Increasing the separation efficiency of photogenerated carriers and preventing the hydrogen back oxidation are two key challenges in photocatalytic hydrogen production. Herein, we report a promising PtO@Ti 3 C 2 /TiO 2 photocatalyst to overcome these two challenges by in-situ growing TiO 2 nanosheets on Ti 3 C 2 MXene (to improve charge separation) and depositing PtO nanodots (to diminish hydrogen back reaction) for enhanced photocatalytic hydrogen production. Within this design principle, the photogenerated electrons and holes in the PtO@Ti 3 C 2 /TiO 2 composites flow in opposite direction into PtO and Ti 3 C 2 respectively, resulting in effective separation of the photogenerated electrons and holes. Beyond, the higher oxidation state of PtO nanodots also largely suppresses the undesirable hydrogen back oxidation reaction. Thereby the PtO@Ti 3 C 2 /TiO 2 composite demonstrates remarkable hydrogen production efficiency. Our work here indicates that rational design of dual co-catalysts could not only promote the separation of photogenerated carriers for enhanced hydrogen production, but also inhibit the reverse reaction of hydrogen production.
研究领域:
材料科学
·
能源科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Chenyi Li,Hongchao Geng,Xingqi Zhu,Chan Gao,Ning Jiang,Yan Qiao,Qingyun Cai
Concerns about bioaccumulation, persistence and toxicity have led to a lot of researches on perfluorinated compounds (PFCs). In order to identity PFCs in real sample, self-assembled TiO 2 nanosheets (TiO 2 NS) were fabricated by an one-step hydrothermal method and applied as matrix for the surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS) detection of PFCs. Compared to the commercial P25 TiO 2 , the proposed self-assembled TiO 2 nanosheets matrix is better reproducibility and higher sensitivity benefiting from the unique hexagon structure of TiO 2 NS. 22 and 12 PFCs have been detected in water samples collected from locations near the outlets of a factory and a waste-water treatment plant, respectively. The proposed method can be a promising tool for high-throughput detect of trace PFCs in real samples.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 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）