CRYSTENGCOMM
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2014
·Vol. 16
·期 16
·3403-3413
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IF 3.858
Enyan Guo,Longwei Yin,Luyuan Zhang
We report on solar cells based on CdS QD sensitized anatase TiO2 hierarchical nanostructures prepared via a facile and controlled hydrothermal process. To adjust the size of CdS QDs, the TiO2 surfaces were first treated with thiolactic acid which provides a binding site for Cd2+ ions. CdS QDs with controllable size are grown onto the TiO2 hierarchical nanostructures. The CdS QDs/TiO2 hierarchical heterojunction nanocomposites display a red shift from the ultraviolet to the visible light region with a longer wavelength for the absorption edge. The matching of band edges between CdS and TiO2 to form a semiconductor heterojunction plays an important role in effective separation of light induced electrons and holes, providing a promising photoanode for its wide absorption spectrum, high electron injection efficiency, and fast electron transference. Under UV-vis irradiation, both CdS and TiO2 are excited. Under visible light irradiation, photons are captured by CdS QDs, with the photogenerated electron–hole pairs rapidly separated into electrons and holes at the interface between TiO2 and CdS QDs. In addition to this, more photoelectrons are generated from TiO2 by harvesting UV photons. TiO2 collects the photoelectrons from CdS and passes them through to the back contact. The holes (from both CdS and TiO2) generated in the process are transferred to the solid–liquid interface. Under one sun illumination, the solar cells based on CdS QDs/TiO2 hierarchical heterojunction nanocomposites with a smaller average size of 7.6 nm for CdS QDs show a maximum short circuit current density of 6.09 mA cm−2 and a conversion efficiency of 3.06%. The performance improvement of the solar cells based on CdS QDs/TiO2 hierarchical nanostructures can be attributed to the unique microstructure characteristics and the bandgap energy matching between the CdS QDs and TiO2.
研究领域:
材料科学
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纳米技术
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Bing Xing,Ting Wang,Xiaobo Han,Kun Zhang,Benxia Li
The rational integration of semiconductor quantum dots (QDs) with anatase TiO 2 nanostructures is a promising strategy to develop efficient photocatalysts. Herein, Bi 2 S 3 QD/TiO 2 photocatalyst was constructed by controllably depositing Bi 2 S 3 QDs on flower-like TiO 2 nanostructures and used for the photocatalytic redox-coupling reaction of H 2 evolution and oxidative transformation of benzyl alcohol. The abundant amino groups in TiO 2 nanostructures served as the anchoring sites for uniform growth of Bi 2 S 3 QDs. The anchoring of Bi 2 S 3 QDs onto TiO 2 nanostructures not only enhanced the photoabsorption ability and the photogenerated charge separation efficiency but also afforded powerful photogenerated charge carriers and abundant active sites for the photocatalytic reaction. As a result, the Bi 2 S 3 QD/TiO 2 photocatalyst exhibited a favorable performance in the redox-coupling reaction, providing the high production rates of H 2 up to 4.75 mmol·g cat −1 ·h −1 and benzaldehyde up to 6.12 mmol·g cat −1 ·h −1 , respectively, as well as an excellent stability in the long-term photocatalytic reaction. Meanwhile, a trace amount of water in the reaction system could act as a promoter to accelerate the photocatalytic redox-coupling reaction. The photocatalytic mechanism following S-scheme heterojunction was proposed according to the systematic characterizations and experimental results. This work offers some insight into the rational construction of efficient and cost-effective photocatalysts for the conversion of solar to chemical energy.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
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DOI
PubMed
高影响因子
FUEL
·
2020
·
IF 5.578
Hau Quoc Pham,Tai Thien Huynh,Son Truong Nguyen,Nam Nguyen Dang,Long Giang Bach,Van Thi Thanh Ho
Direct alcohol fuel cells (DAFCs) use liquid and renewable fuels that have been sparked significant interest in a variety of applications; however, the poor catalytic performance of the state-of-the-art Pt nanoparticles (NPs) over carbon support is a major challenge for further DAFC utilization. Herein, the 1D-bimetallic Pt 3 Co nanowires with a diameter of ~4 nm and the lengths of up to several tens nanometers were grown firstly on the non-carbon Ti 0.7 W 0.3 O 2 nanoparticles via a template- and surfactant-free chemical reduction preparation at room temperature. Electrochemical results indicated that the bimetallic Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 catalyst was an effective electrocatalyst toward alcohol (methanol, ethanol) electrochemical oxidation. For instance, the bimetallic Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 catalyst exhibited high mass activity (MOR of ~393.29 mA m g P t - 1 and EOR of ~341.76 mA m g P t - 1 ), low onset potential (~0.01 V vs. NHE for MOR and ~0.20 V vs. NHE for EOR) and superior CO-tolerance (I f /I b value for MOR of ~3.11 and EOR of ~1.54) in comparison with the conventional carbon-supported Pt nanoparticles (NPs) catalyst. Additionally, the mass activity loss of the Ti 0.7 W 0.3 O 2 -supported Pt 3 Co (NWs) catalyst was ~10.68% of the initial mass activity, which ~4.18-time lower than that of the carbon-supported Pt (NPs) catalyst (~44.66% of the initial mass activity) after 5000 cycles test, indicating the superior stability retention of the as-obtained Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 electrocatalyst . These enhancements were attributable to the combination of the advantageous 1D nanostructures with the internal effect of the Pt 3 Co nanowires, the synergistic effect between Pt-M alloy and TiO 2 -based nanomaterials and the superior anti-corrosion possibility of the non-carbon support.
研究领域:
材料科学
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电化学
·
能源科学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Chuanjin Lin,Guoquan Suo,Rongrong Mu,Jiarong Li,Laraib Habib,Xiaojiang Hou,Shukai Ding,Jianfeng Zhu
Water-induced degradation threatens sandstone cultural relics, highlighting the need for effective protection. This study applies a nano-coating of PFDTS-modified TiO 2 /SiO 2 to sandstone, optimizing PFDTS concentration, coating penetration depth, and hydrophobicity. A TiO 2 -to-SiO 2 ratio of 75:25 with 80 μL of PFDTS achieved high water and oil contact angles of 152.7° and 145.7°, respectively. After 210 h of UV exposure, contact angles showed minimal reduction, confirming the coating's durability. Additionally, air permeability is preserved to maintain sandstone breathability. These findings provide valuable insights for safeguarding sandstone heritage sites against weathering.
研究领域:
材料科学
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文物保护
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 14
·D663
·
IF 3.662
Xue Bai,Kai Gao,Xin Huang,Caidie Qin,Yi Zhang,Xuan Han
Three-dimensional (3D) metal inorganics have gained tremendous interests for a series of applications. Here, we prepared TiO2 microspheres, urchin-like TiO2, and flower-like TiO2 by hydrothermal method. The morphologies of the three 3D TiO2 nanostructures were characterized by scanning electron microscopy and X-ray diffraction analyses. The electrochemical behaviors of the 3D TiO2 nanostructures were investigated by electrochemical impedance spectroscopy and cyclic voltammetry studies. Results showed that 3D TiO2-modified electrodes exhibited improved electrochemical performance compared with bare electrode. The three 3D nanostructures were then used with a modified glassy carbon electrode to detect dopamine (DA). According to the experimental results, the flower-like TiO2/GCE demonstrated excellent electrochemical performance than the two other electrodes. The enhanced electrochemical performance of the 3D flower-like TiO2/GCE is mainly affected by the structure of anatase crystal, which is the most important factor for the enhanced electrochemical performances toward DA detection. The flower-like TiO2/GCE, urchin-like TiO2/GCE, and TiO2 microspheres/GCE possessed linear ranges of 0.02–160, 1–180, and 1–160 μM, with limit of detection values of 0.007, 0.31, and 0.33 μM, respectively.
研究领域:
材料科学
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电化学
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分析化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yayuan Li,Shubo Cao,Ang Zhang,Chen Zhang,Ting Qu,Yongbin Zhao,Aihua Chen
It is of great importance to extend the UV response of anatase TiO 2 into the visible light range for the practical applications. Here, a facile rout to carbon and nitrogen co-doped, Au loaded bowl-like TiO 2 nanostructures with tunable size are proposed by using self-assembled polystyrene- block -poly(4-vinylpyridine) (PS- b -P4VP) block copolymer (BCP) spherical micelles as templates. Amphiphilic PS- b -P4VP self-assembles to form PS@P4VP core–shell spherical micelles with P4VP as the out layer in an evaporable mixed solvents of ethanol/tetrahydrofuran (THF). The size of uniform PS@P4VP spherical micelles can be precisely tuned in the range of a few nm to several hundred nm by controlling the molecular composition of the BCPs. Bowl-like TiO 2 nanostructures with a replicate size loaded with highly dispersed Au nanoparticles (NPs) of ∼5 nm in diameter are fabricated from these spherical micelles because of strong complex ability of pyridine groups. PS- b -P4VP provides carbon and nitrogen sources to dope the resulting samples simultaneously. The special carbon and nitrogen co-doped bowl-like Au/TiO 2 nanostructures exhibit much higher photocatalytic activity in the photodegradation of rhodamine B (RhB) compared to Au/P25 under visible light irradiation. Furthermore, the photocatalytic activity is significantly influenced by the BCP molecular composition due to different surface area and loading capacity of the resulting samples. This study provides a facile way to synthesize multi-element doped hollow or bowl-like nanoparticles with tunable size in the nanometer range which have potential application at photocatalysis, oxygen reduction reaction, etc.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 69
·36708-36712
·
IF 3.708
Lei Zeng,Wulin Song,Changsheng Xie
Here, we report a special rod in tube nanostructured TiO2 prepared by a moderate esterification reaction. The morphology evolution with reaction time was observed by FSEM and FETEM. Comparing to the as-reported sphere in sphere nanostructured TiO2, the formation of a rod in tube nanostructure was attributed to the use of a solid precursor. The nucleation-dissolution-anisotropic grain growth-recrystallization mechanism is responsible for the formation of the rod in tube nanostructure. Moreover, the photocatalytic properties of different morphologies of samples were also compared, indicating that the rod in tube nanostructured TiO2 possessed the best photocatalytic activity. The improvement of photocatalytic activity is mainly attributed to the enhancement of light-harvesting and the separation of electron–hole pairs. Finally, the present work also provided a template-free method to synthesize hierarchical porous TiO2 nanotube through prolonging reaction duration.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 11
·
IF 5.3
Yong Li,Hongpeng Zhang,Canni Zhuo,Xixi Sun,Jiaqi Gao,Yali Zhao
The solar-driven water splitting for the production of renewable green hydrogen fundamentally relies on the exploration of efficient photocatalysts. Nanostructured TiO2is widely recognized as a promising material for photocatalysis, yet it remains hindered by inadequate light harvesting and fast photogenerated carrier recombination. Herein, calcined C/TiO2xerogels with yolk–shell and core–shell nanostructures (denoted as YS-C/TiO2and CS-C/TiO2) were designed and fabricated via a typical sol–gel–calcination assisted approach. Thanks to the encapsulation of carbon nanospheres into TiO2, it effectively enhances light absorption, improves carrier separation, and lessens carrier recombination, making the well-designed YS-C/TiO2composite display a remarkable hydrogen evolution rate of 975 µmol g−1h−1under simulated solar light irradiation and without the use of any co-catalyst, which is approximately 21.7 times that of the commercial TiO2. The work provides an efficacious design concept in developing nanostructured TiO2-based photocatalysts and in boosting broad photocatalytic applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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