Science China-Materials
·
2019
·Vol. 63
·期 1
·35-46
·
IF 5.636
Wang Wenhui,He Yutong,Qi Limin
The rapid development of perovskite solar cells (PSCs) has stimulated great interest in the fabrication of colorful PSCs to meet the needs of aesthetic purposes in varied applications including building integrated photovoltaics and wearable electronics. However, it remains challenging to prepare high-efficiency PSCs with attractive colors using perovskites with broad optical absorption and large absorption coefficients. Here we show that high-efficiency PSCs exhibiting distinct structural colors can be readily fabricated by employing TiO 2 nanobowl (NB) arrays as a nanostructured electron transport layer to integrate with a thin overlayer of perovskite on the NB arrays. A new crystalline precursor film based on lead acetate was prepared through a Lewis acid-base adduct approach, which allowed for the formation of a uniform overlayer of high-quality CH 3 NH 3 PbI 3 crystals on the inner walls of the NBs. The PSCs fabricated using the TiO 2 NB arrays showed angle-dependent vivid colors under light illumination. The resultant colorful PSCs exhibited a remarkable photovoltaic performance with a champion efficiency up to 16.94% and an average efficiency of 15.47%, which are record-breaking among the reported colorful PSCs.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Lei He,Yanan Dong,Yane Zheng,Qingming Jia,Shaoyun Shan,Yaqin Zhang
A novel magnetic MIL-101(Fe)/TiO 2 composite was synthesized for photo degradation of tetracycline (TC) under solar light. The composite was characterized by XRD, TGA, SEM, TEM, EDS, BET, FTIR, XPS, VSM, ESR, and PL. The resultant composite was environment friendly material, which exhibited high TC degradation efficiency and excellent reusability. In the meantime, it could be separated easily from TC solution by using magnet, which would save significant time and cost of preparation and degradation, having broad prospect in application. Using 1 g L −1 magnetic MIL-101(Fe)/TiO 2 at pH = 7, 92.76% degradation efficiency was achieved under solar light irradiation in 10 min for 20 mg L −1 TC. Further experiments indicated that TiO 2 introduced in the composite played an important role in the degradation process, which could be activated by the UV light in solar light to generate large amount of O 2 − and OH radicals. The degradation efficiency of TC in this paper was significantly higher than other research papers reported in last three years. This study put forward new magnetic Fe-based metal-organic frameworks (MOFs)/TiO 2 composite for degrading pharmaceutical wastewater.
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Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 4
·1406-1414
·
IF 8.262
Dong Wei,Jun Ji,Dandan Song,Meicheng Li,Peng Cui,Yaoyao Li,Joseph Michel Mbengue,Wenjia Zhou,Zhijun Ning,Nam-Gyu Park
The structure of the perovskite solar cells (PSCs) is either mesoporous or planar. Here, a novel structure for highly efficient and stable PSCs is proposed, i.e., an embedded structure, which combines the advantages of the mesoporous and planar structures. The embedded structure utilizes a TiO2 nanoparticle embedded perovskite (CH3NH3PbI3) film as the absorption layer. The presence of TiO2 nanoparticles in the perovskite film could improve the electron extraction, and promote the formation of a compact perovskite layer with large grains. Consequently, the performance of the PSCs is significantly improved with the efficiency increasing from 16.6% for the planar structure to 19.2% for the embedded structure, which is the best performance of the MAPbI3-based PSCs. Furthermore, the TiO2 embedded perovskite films present better long-term stability than the pristine perovskite films, and the corresponding PSCs, which have no other chemical modifications, also show excellent stability with efficiency approaching 80% (for average) or 90% (for the best) after being exposed to air for 28 days without encapsulation.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 5
·3430-3434
·
IF 1.483
Nie Shijie,Liu Debao,Liu Yunshi,Yang Ping
TiO2 fibers with controlling phase composition were fabricated by an electrospinning route and a subsequent calcined process. The pre-hydrolysis of precursor was carried out to create dense TiO2 fibers for the first time. The degree of the pre-hydrolysis plays
an important role for the controlling of electrospinning process. Different heat-treatment parameters were applied to adjust the phase proportions of anatase and rutile in TiO2 fibers. The phase composition of the fibers was ascribed not only to the heat-treated rate, time, and
temperature, but also to the degree of precursor pre-hydrolysis as well. Even though heat-treating at 650 °C, TiO2 fibers still revealed a mixture phase composition of anatase and rutile. Dense TiO2 fibers with unique morphology and size were fabricated using optimal
preparation conditions. The photocatalysis performance of the fibers was evaluated according to the photodecomposition of methyl orange under ultraviolet light irradiation. Photocatalytic degradation rate was estimated by kinetic constants. The photocatalytic performance of TiO2
fibers depended strongly on their phase compositions. These dense TiO2 fibers with different phase compositions would be utilizable for various applications.
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Nanoscale
·
2015
·Vol. 7
·期 28
·12215-12224
·
IF 7.394
Yongquan Zhang,Qiang Fu,Qiaoling Xu,Xiao Yan,Rongyu Zhang,Zhendong Guo,Fei Du,Yingjin Wei,Dong Zhang,Gang Chen
N-doped TiO2-B nanowires are prepared by the solvothermal method using TiN nanoparticles as the starting material. X-ray photoelectron spectroscopy shows that the N dopants preferentially occupy the interstitial sites of TiO2-B up to a content of ∼0.55 at%. Above this critical value, the N dopants will substitute the oxygen atoms which improve the electronic conductivity of TiO2-B. The maximum proportion of substituted-N in the TiO2-B nanowires is ∼1.3 at%. Raman scattering shows that the substituted-N strengthens the Ti(1)–O1–Ti(2) and O1–Ti(1)–O3 bonds of TiO2-B. This improves the stability of the corresponding local structures, thus reducing the distortion of the Li+ diffusion channel along the b-axis of TiO2-B. As a result, the substituted-N has more of an impact on the electrochemical properties of TiO2-B than the interstitial-N does. The TiO2-B nanowires containing substituted-N dopants exhibit a remarkably enhanced electrochemical performance compared to pure TiO2-B. They show a discharge capacity of 153 mA h g−1 at the 20 C rate with a capacity retention of 76% after 1000 cycles. In addition, they can deliver a discharge capacity of 100 mA h g−1 at an ultra-high rate of 100 C, indicating their great potential in high power lithium ion batteries.
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ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Xing Guo,Bingjuan Zhang,Zhenhua Lin,Jing Ma,Jie Su,Weidong Zhu,Chunfu Zhang,Jincheng Zhang,Jingjing Chang,Yue Hao
The performance of planar perovskite solar cells (PSCs) is very sensitive to the interfaces properties , especially the electron transport layer (ETL)/perovskite interface in the n-i-p structure, which could significantly influence the perovskite film morphology, crystallinity and the charge extraction and collection efficiency. Therefore, interface engineering is crucial for achieving high performance planar PSCs. Here, we reported a simple and effective interface engineering method which employed phenyl-C61-butyric acid methyl ester (PC 61 BM) thin film or fullerene (C 60 ) self-assembled monolayer (SAM) or their combination to modify the titanium dioxide (TiO 2 )/perovskite interface to obtain high performance PSCs. A comparative study between the effects of different fullerene derivative modifications was taken and indicated that adding proper C 60 -SAM into the PC 61 BM solution could improve the interface contact, increase the charge extraction and collection efficiency more obviously compared to the pristine PC 61 BM treatment. By combining the modified two-step spin coating method, the best performance device based on C 60 -SAM modified TiO 2 achieved a power conversion efficiency (PCE) of 17.8%, much higher than the control device without the interface treatment (12.9%) and also higher than the PC 61 BM modified device (16.1%) based on MA 1-y FA y PbI 3-x Cl x perovskite. As a consequence, such interface engineering via C 60 -SAM or PC 61 BM + C 60 -SAM combination modification is a promising method for achieving highly efficient PSCs.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 11
·7470-7484
·
IF 3.5
Burhan Ullah,Millicent Appiah,Yuting Xiao,Yixing Yang,Daniel Q. Tan
Ba 1 − x Sr x Mg 2 − y Zn y V 2 O 8 compounds, abbreviated as BSMZVO@ xy ( x = 0.0–0.2 and y = 0.02), were synthesized with tetragonal structures. The microstructure, molecular structure, and polarization mechanism were investigated using X-ray diffraction, electronic microscopy, Raman spectroscopy, and vector network analyzer. The sintering temperatures (<900°C) and microwave dielectric properties of BSMZVO are significantly impacted by (Sr/Zn) 2+ substitution and TiO 2 mixing. The BSMZVO@ xy ( x = 0.15 and y = 0.02) exhibited encouraging ε r (12.4–12.7), Q × f (40 054–40 973 GHz), and temperature coefficient of resonance frequency ( τ f ∼ −5.2 to 0.0 ppm/°C) after sintering at 860°C/4 h and 800°C/4 h. For the first time, TiO 2 was added to enhance the density and Q × f value without degrading τ f . The 0.25 wt.% TiO 2 resulted in optimum ε r of 13.4, Q × f of 43 636 GHz, and τ f of +1.8 ppm/°C after sintering at 760°C/4 h. The improved quality factor ( Q × f ) is linked to the Raman A 1g mode and relative density.
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CELLULOSE
·
2025
·
IF 4.8
Zhang Yujie,Li Liangsheng,Huang Jianxi,He Xinru,Xuan Xuan,Shi Wenming,Yu Yongsheng,Chen Heng
Transparency is an important characteristic for film products, yet it remains a formidable challenge in the realm of organic-inorganic hybrid and composite materials. Herein, we report the development of transparent TiO 2 /cellulose hybrid films through an innovative in situ synthesis method, integrating TiO 2 formation during the regeneration process of cellulose. These hybrid films exhibit exceptional transparency, rivaling that of pure regenerated cellulose films, while simultaneously boasting a robust UV-shielding capacity. The successful integration of TiO 2 into the hybrid films was validated through XPS and Raman analysis, while XRD patterns revealed a decrease in the crystallinity of regenerated cellulose due to the introduction of TiO 2 . To investigate the dye removal capabilities of these films, methylene blue was chosen as a model dye. Our experiments indicate that the incorporation of TiO 2 significantly enhances the dye absorption capacity and catalytic photodegradation activity of the regenerated cellulose film. Furthermore, antibacterial tests targeting Escherichia coli and Staphylococcus aureus revealed that these hybrid films exhibit remarkable antibacterial properties, effectively inhibiting bacterial growth in both dark and UVC irradiation conditions. Collectively, these results underscore the promising applications of TiO 2 /cellulose hybrid films in diverse fields, including dye wastewater treatment and active food packaging. Graphical abstract
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Nanoscale
·
2024
·Vol. 16
·期 27
·12992-12999
·
IF 5.8
Huiling Zhu,Xiangran Xu,Yongchao Wang,Jian Ding,Xinru Yu,Xiaoyi Liu,Zhaowu Zeng,Huan Wang,Zhen Li,Yang Wang
The photocatalytic conversion of nitrogen into high-value ammonia products holds tremendous potential in the global nitrogen cycle. However, the activation of N2 and competition of hydrogen evolution limit the improvement of nitrogen fixation performance. In this study, we developed a fluorinated TiO2 (F-TiO2) using a hydrothermal-annealing method. The incorporation of F dopants not only enhances the adsorption and activation of N2 through electronic structure regulation, but also facilitates an in situ increase in active sites via the electron repulsion effect between F and Ti atoms. In addition, the presence of F on the surface effectively improved the nitrogen supply problem and optimized the nitrogen fixation selectivity for its hydrophobic modulation. The NH3 yield of the F-TiO2 photocatalyst reached 63.8 μmol h−1 g−1, which was 8.5 times higher than that of pure TiO2. And the selectivity experiment showed that the electronic ratio of NH3 to H2 production reached 0.890. This research offers valuable insights for the design of highly efficient and selective nitrogen-fixing photocatalysts.
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PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Xinye Xu,Junxiao Qiu,Zheng Li,Anni Fu,Shutong Yuan,Hai Li,Baoyang Lu
Integrating interfacial solar steam generation with photocatalytic degradation technology holds significant prospects for practical applications in simultaneous clean water collection and organic pollutant degradation. However, existing photothermal-photocatalytic bifunctional evaporators still suffer from performance deficiencies such as limited light absorption, insufficient evaporation rate and degradation efficiency, leading to the partial contaminant residual in complex wastewater. Herein, we propose a surface functionalization-bicrosslinking strategy to develop a novel photothermal-photocatalytic bifunctional hydrogel solar evaporator. The strategy involves surface functionalization of TiO 2 nanoparticles to form core-shell structured bifunctional TiO 2 @C nanoparticles by dopamine-modified thermal treatment, followed by composting with polyacrylamide/sodium alginate (PAM/SA) to achieve microporous double-network hydrogel. The resultant TiO 2 @C/PAM/SA hydrogel composites exhibit efficient sunlight absorption of up to 99.87 %, a remarkable evaporation rate of 2.97 kg m −2 h −1 with an outstanding photothermal efficiency of 92.13 %, as well as high photodegradation efficiency of 84.37 % under one sun irradiation. We further integrate such hydrogel composites into the fabrication of photothermal-photocatalytic bifunctional evaporators, which demonstrate efficient purification and photocatalytic efficacy in various water samples, including low-to-high concentrated brines and heavy metal ion/organic pollutant-containing wastewater. Such a strategy of designing high-performance photothermal-photocatalytic hydrogels opens new avenues to coherent solar desalination and organic pollutant degradation for complicated seawater/wastewater systems.
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RSC Advances
·
2025
·Vol. 15
·期 16
·12629-12644
·
IF 4.6
Yinqi Yang,Guoshuai Ma,Xiaoli Hu,Wei Wang,Zhonglin Du,Yao Wang,Xue-zhong Gong,Haoyu Tan,Fengxiang Guo,Jianguo Tang
In the context of sustainable development, the utilization of semiconductor materials for the degradation of dyes, antibiotics, heavy metals, and pesticides in wastewater under visible light has emerged as a focal point of contemporary research. In this investigation, a WO3@TiO2 composite was synthesized via a solvothermal method, with the composite exhibiting a molar ratio of 5% WO3 to TiO2 precursors demonstrating optimal photocatalytic degradation performance. This material achieved complete degradation of 20 mg per L Rhodamine B (RhB) dye and tetracycline (TC) antibiotic within 30 min. Furthermore, the effects of initial pollutant concentration and solution pH on catalytic efficacy were systematically explored. The findings revealed that at RhB concentrations below 40 mg L−1, the degradation proceeded at an accelerated rate, with a rate constant exceeding 0.128 min−1. The catalyst exhibited robust performance across a broad pH range, attaining peak degradation efficiency at pH ≈ 3. The exceptional photocatalytic prowess of the WO3@TiO2 composite is predominantly attributable to its distinctive hollow microstructure, the intimate interfacial synergy between WO3 and TiO2, and the efficient separation of photogenerated electrons and holes facilitated by the type-II heterojunction architecture.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tianwei Zhao,Gang Cheng,Wuxia Zhang,Jinyan Xiong
Hollow-structured TiO 2 is promising for photocatalytic CO 2 reduction due to its high surface area and light absorption. This study aims to enhance its photocatalytic activity through the engineering of Cu and CuAg alloy cocatalysts. Hollow TiO 2 was synthesized by a hard template method, followed by Cu loading and CuAg alloy formation via a chemical replacement reaction. The optimal 7 % Cu loading achieved the highest CH 4 yield of 2.47 μmol g −1 h −1 among the TiO 2 -Cu composites. Introducing Ag further enhanced the performance, with the Cu:Ag = 9:1 alloy boosting the CH 4 yield to 6.72 μmol g −1 h −1 , approximately 14 times that of pure TiO 2 . Characterization techniques such as XRD, SEM, and XPS were also employed to analyze the phase composition, microstructure, and photoelectrochemical properties of the synthesized materials. The experimental findings indicate that the introduction of the CuAg alloy significantly promotes charge separation and transfer efficiency, and increases the effective active sites on the TiO 2 surface, thereby greatly enhancing the efficiency of the photocatalytic reaction. These findings offer insights into the design of efficient photocatalytic materials for sustainable energy applications.
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