RSC Advances
·
2019
·Vol. 9
·期 38
·21777-21785
·
IF 3.049
Yafeng Deng,Zhanhong Ma,Fengzhang Ren,Guangxin Wang
An innovative two-step method perfectly prepared TCLs with different thicknesses, and then the TNA films based on TCLs were successfully prepared. The effects of different thicknesses of TCLs on the morphology and photoelectrochemical performance of TNA films were investigated. The results indicated that TCLs with appropriate thickness could effectively improve the morphology and photoelectrochemical performance of TNA films. Compared with the TNA films based on TCL5, TCL10 and TCL30, the TNA film based on TCL20 exhibited more ideal and comprehensive photoelectrochemical performance. Moreover, dye-sensitized solar cells (DSSCs) based on this TNA film achieved the highest Jsc (10.2054 mA cm−2), Voc (0.5737 V), PCE (3.3%) and Pout (3.31 mW cm−2).
研究领域:
材料科学
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能源科学
·
光化学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jianfang Hu,Hao Song,Mengjie Sun,Bo Wang,Xuchun Wang,Qingsong Guo,Han Li,Shuangjie Wu,Li Huang,Yun Li,Xuming Zhang
The photoelectronchemical (PEC) activity of the photocatalyst is largely dependent on the concentration and lifetime of the photogenerated carriers, however, these carriers are easily and quickly neutralized within the photocatalyst. To address this issue, we designed a superstructure of graphene-intercalated TiO 2 nanoparticles (TiO 2 /G) by pyrolyzing octylamine-intercalated hexafluorotitanic acid hybrids. The inserted graphene accelerates photoelectron transfer and reduces the recombination of photogenerated carriers in the body, while maintains the structural stability. The TiO 2 /G hybrid composite exhibits a low carbon content of only 1.3 wt.%, a strong Ti-C chemical interaction between TiO 2 and intercalated graphene, and a large surface area of 38.88 m 2 /g, nearly five times that of bare TiO 2 (7.96 m 2 /g). The findings from the photocatalytic experiments indicate that the photocatalytic efficiency and photocurrent response of TiO 2 /G are twice and 4.22 times higher, respectively, compared to standard TiO 2 nanoparticles. This indicates a substantial promise for the superstructure in photoelectrochemistry and energy conversion applications.
研究领域:
材料科学
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能源转换
·
光催化
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 11
·4046-4055
·
IF 8.897
Xu Yue,Zhao Chenxi,Zhang Xi,Xu Jingwen,Yang Lingling,Zhang Zhechen,Gao Zhida,Song Yan-Yan
Infectious diseases caused by bacteria are a global threat to the human health. Here, we propose a solvent “irrigation” technique to endow TiO 2 nanotubes (NTs) to precisely modify with functional nanomaterials, and apply them in constructing a near-infrared (NIR) light controlled drug-delivery system for rapid necrosis of bacteria. In this design, the NIR stimuli-responsive functional shell is located on the external tube wall of TiO 2 NT; the internal tube wall offers sufficient binding sites for drug loading. Using kanamycin as a model drug, we demonstrate that the reactive oxygen species generated in photocatalysis not only controllably release the loaded drug by scissoring the linked chains, but also effectively compromise bacteria membrane integrity by damaging the cell wall. Benefiting from the damages, antibiotics rapidly enter the bacteria and reach ≥99.9% reduction in Escherichia coli colony within only 2 h. Importantly, such a covalently conjugation-based delivery system can efficiently relieve radical-induced inflammation and cytotoxicity. This study provides an innovative design strategy for engineering delivery systems with tailorable components, enduring stimuli-response by multiple triggers.
研究领域:
生物材料学
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纳米医学
·
抗菌研究
✓ 已验证
产品关联
DOI
高影响因子
Energy Material Advances
·
2023
·
IF 12.9
Haixiang Huang,Jinting Chen,Tingting Xu,Yujie Lv,Bogu Liu,Bao Zhang,Jianguang Yuan,Ying Wu
Complex metal oxide catalysts greatly accelerate the hydrogen sorption rates in the magnesium hydride system. In this study, the graphene-supported Sc2O3/TiO2 catalyst is synthesized by means of a simple method, and a surprisingly synergetic effect of the Sc2O3-TiO2 cocatalyst on the hydrogen storage performance of MgH2 is observed. The MgH2-Sc2O3/TiO2@Gn composite starts to release hydrogen at 140 °C and reaches the peak dehydrogenation temperature at 239.9 °C. It absorbs 6.55 wt% of H2 in 1 min and desorbs 5.71 wt% of H2 in 10 min at 300 °C, showing excellent hydrogen absorption and desorption performance. Furthermore, with the decrease of the grain size and changes in the structure, the activity of the catalyst is greatly improved. The low-valent titanium and scandium and oxygen vacancies formed in the process of dehydrogenation facilitate hydrogen diffusion and electron transfer, and further improve the kinetic performance of the Mg/MgH2-Sc2O3/TiO2@Gn system. This study aims to provide insights into studying complex metal oxides as catalysts to improve hydrogen storage performance, and shed light on other catalysis-related research.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Baolong Zhang,Fangxuan Liu,Bin Sun,Tingting Gao,Guowei Zhou
ABSTRACT Photocatalytic water splitting to produce H 2 using semiconductor photocatalysts is a reliable approach to alleviating energy shortages and environmental pollution. However, the inadequate light-harvesting ability, rapid photogenerated carrier recombination, and inferior redox capacity of the individual photocatalysts restrict their photocatalytic activity . To address these limitations, a hierarchical S-scheme heterojunction of ZnIn 2 S 4 -nanosheet-decorated flower-like TiO 2 microspheres for enhancing photocatalytic H 2 evolution, purposely constructed through in situ chemical bath deposition, has been reported. The as-synthesized TiO 2 /ZnIn 2 S 4 heterojunctions exhibited ZnIn 2 S 4 -content-dependent photocatalytic activity for solar-driven H 2 evolution. As a result, the optimized TiO 2 /ZnIn 2 S 4 heterojunction exhibited a superior photocatalytic H 2 evolution rate of 6.85 mmol g –1 h –1 , approximately 171.2- and 3.9-fold with respect to that obtained on pure TiO 2 and ZnIn 2 S 4 , respectively, mainly attributed to the unique hierarchical structure, extended light-harvesting ability, enhanced redox capacity, and improved separation and transfer efficiencies of the photogenerated carriers induced by the S-scheme heterojunctions. Simultaneously, a detailed analysis of the S-scheme electron transfer pathway in the TiO 2 /ZnIn 2 S 4 heterojunction was performed using in situ irradiated X-ray photoelectron spectroscopy and electron paramagnetic resonance spectroscopy . This study provides insights into the design of highly active heterojunction photocatalysts for sustainable solar-to-fuel energy conversion.
研究领域:
材料科学
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能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Hui Xue,Jingli Yin,Weifeng Li,Yumei Long
The exploration of enzyme-mimic nanocomposites to replace commercial enzymes is challenging in the construction of biosensors with high performance. Herein, an ultrafast response nonenzymatic glucose sensor was developed based on a Cu2O–TiO2/Ti3C2Tx nanocomposite, which was prepared via an in situ redox procedure using Ti3C2Tx nanosheets both as a reducing agent and a carrier substrate. Structural characterizations, including X-ray diffraction (XRD) and transmission electron microscopy (TEM), revealed that Cu2O nanoparticles with a size of 10–30 nm are uniformly distributed on the surface of the Ti3C2Tx nanosheets and form close contacts through Ti–O–Cu bonds, resulting in favorable stability of the system. The unique heterostructure of Cu2O–TiO2/Ti3C2Tx can produce abundant active sites and facilitate electron transfer, demonstrating enhanced catalytic activity in the electrooxidation of glucose. Consequently, the electrochemical sensor fabricated by modifying a glassy carbon electrode (GCE) with Cu2O–TiO2/Ti3C2Tx nanocomposites exhibited excellent analytical properties for glucose detection, including a fast response time of 0.1 s, a low detection limit of 0.67 μM, and a high sensitivity of 267 μA mM–1 cm–2. In addition, the developed method possesses good anti-interference ability and superior stability and thus has been successfully applied for real sample monitoring. This study offers a way to construct Ti3C2Tx-based heterostructures with tunable physiochemical properties and expands their use in the electrochemical field.
研究领域:
材料科学
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电化学
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生物传感
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产品关联
DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2021
·
IF 3.757
Wenfeng Zhou,Xiaohong Zhou,Wei Zhuang,Rijia Lin,Ye Zhao,Lei Ge,Ming Li,Jinglan Wu,Pengpeng Yang,Hongman Zhang,Chenjie Zhu,Hanjie Ying
To effectively immobilize an enzyme while maintaining its high activity and stability, the design of supports with controlled geometric structures and heterogeneous surface properties is desirable. Towards this goal, heterogeneous titanium dioxide (TiO 2 ) surfaces with controlled pore sizes were synthesized in this study and used to efficiently immobilize lipase. The immobilized lipase activity increased by a factor of 1.31 with an increase in the TiO 2 pore size from 11.46 to 21.14 nm. The highest protein loading of 15.52 mg/g was achieved in ethenyl triethoxy silane (ETS)-modified TiO 2 (E-P25) after immobilizing the enzymes at 30 ℃, pH 7.33 for 3 h and using a protein concentration in solution of 0.176 mg/mL. Among the different surface functionalities, the highest activity yield of 428.04 % was accomplished by using TiO 2 calcinated at 650 ℃ and modified by ETS as immobilization support. The immobilized enzymes showed excellent storage stability and retained almost 95 % of their activity after being stored at 4 ℃ for 8 weeks. This research provides experimental evidence that highlights the importance of studying of enzyme immobilization on the supports with synergistically designed geometric structures and surface chemical properties.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Zhongying Liu,Yihai Zhou,Liangjun Yang,Renchun Yang
The preparation of high-efficiency photocatalysts by green and mild methods is very attractive for photocatalysis field. Here, TiO 2 /Ti 3 C 2 was prepared by in-situ oxidation with a green method, in which only water or H 2 O 2 was used. A heterojunction interface formed between the anatase phase TiO 2 and the Ti 3 C 2, which was demonstrated by HRTEM and XRD. Fluorescence spectra and i-t transient photocurrent are used to study the separation efficiency of photogenerated electron-hole pairs. The close contact between Ti 3 C 2 and TiO 2 speed up the separation of photo-generated electron-hole pairs, promoting a higher hydrogen production performance around 2520.4 μmol·g −1 ·h −1 on TCT-1.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Chao Peng,Ping Wei,Xiaoyao Li,Yunpeng Liu,Yonghai Cao,Hongjuan Wang,Hao Yu,Feng Peng,Liyun Zhang,Bingsen Zhang,Kangle Lv
It is of prime importance to harness the transfer and flow of photogenerated electrons and holes to elongate the lifetimes of charge carriers and enhance the activity of semiconductor photocatalyst , which can be achieved by hybridizing the photocatalyst with appropriate cocatalysts with right electronic properties and placement. Herein, MXenes, a young family of two-dimensional transition metal carbides , are exploited as a hole mediator to enhance the photocatalytic activity of TiO 2 . We grow TiO 2 sheets exposing (001) surfaces on layered Ti 3 C 2 T x , and then photodeposited Cu 2 O nanodots on TiO 2 . We experimentally prove that the Ti 3 C 2 T x MXene from the wet HF etching method behaves as a low work function material ( ϕ = 3.4 eV). Thanks to this unique electronic property, the photogenerated electrons on TiO 2 hybridized with Ti 3 C 2 T x accumulate and tunnel to Cu 2 O to reduce it to elemental Cu as a reduction cocatalyst. The resulting Cu/TiO 2 @Ti 3 C 2 T x photocatalyst efficiently split water to produce hydrogen at 860 μmol g −1 h −1 . The results presented here demonstrate the promise of MXene materials in photocatalytic solar energy utilization. The insight into the electronic property of MXene sheds light on the new approach to the rational design of high-efficiency photocatalysts composed of MXenes.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2020
·
IF 0
Pengfei Zhang,Zhangliu Tian,Chin-Te Hung,Yong Liu,Bingquan Jia,Kun Lan,Biao Kong,Fuqiang Huang,Liqiang Mai,Dongyuan Zhao
The understanding and control of the structural complexity of mesoporous semiconductors with single-crystal-like nature are both attractive and challenging. Here, we report a crystallization-driven epitaxial assembly from monomicelles to construct branched mesoporous TiO 2 mesocrystals (m-TiO 2 MCs) with coherent atomic domains. The star-shaped multipods are obtained by two-step evaporation with nanocrystal mediation, primarily consisting of arms along < 001 >, < 101 >, and < 111 > crystal directions. For each arm, ordered open mesochannels arrange in parallel along the growth direction. The m-TiO 2 MC multipods have a surface area of ∼116 m 2 /g and single-crystal-like frameworks and are good hydrogen evolution photocatalysts. Under full-spectrum irradiation, the branched m-TiO 2 MCs exhibit a hydrogen evolution rate of 8 mmol h −1 g −1 , which is more than four times higher than that of commercial TiO 2 P25. This crystallization-driven self-assembly approach may provide valuable insight into designing programmable mesoporous mesocrystals by controlling the oriented assembly of monomicelle building blocks.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
ChemistrySelect
·
2025
·Vol. 10
·期 17
·e202404262
·
IF 2
Zhiwei Cai,Junhao Chen,Ning Jiang,Chao Chen,Shijun Ma,Yimin Shen,Guojun Xu,Corinne Boudon,Yaokang Lv,Laurent Ruhlmann
Graphical Novel Ag/TiO 2 @CaSiO 3 materials were synthesized by using Ag-doped titanium cage [AgTi(SC) 2 (HSC)(CH 3 CN)] 2 . Ag + ions serve to disrupt bacterial cell membranes while amplifying the bactericidal effects of superoxide ions and hydroxyl radicals generated by TiO 2 . Within the Ag/TiO 2 @CaSiO 3 materials, Ag/TiO 2 is uniformly distributed on the CaSiO 3 substrate, manifesting significant antibacterial activity. The investigation presents a newly synthesized Ag/TiO 2 @CaSiO 3 composite derived from an orange titanium cage. Obtained through a streamlined fabrication process and calcination at variable temperatures, the material underwent distinct structural alterations. Characterization analyses indicated the emergence of a porous architecture, facilitating robust Ag + ion adsorption. Among the variants studied, materials calcined at 150 °C demonstrated enhanced antibacterial activity against both Escherichia coli and Staphylococcus aureus . The integration of CaSiO 3 into the Ag/TiO 2 matrix resulted in the formation of Ag/TiO 2 @CaSiO 3 . This composite amalgamates the immediate antibacterial efficacy of Ag + ions with the enduring antibacterial functionality of Ag/TiO 2 , additionally augmenting antibacterial performance through reactive oxygen species generation. Owing to its remarkable antibacterial attributes, the Ag/TiO 2 @CaSiO 3 composite is a promising candidate for addressing infection control challenges in medical settings.
研究领域:
材料科学
·
微生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
Biomed Research International
·
2015
·
IF 1.579
Yan Ma,Kejia Zhang,Cong Li,Tuqiao Zhang,Naiyun Gao
The photocatalytic degradation of sulfonamides in aqueous TiO2 suspension under UV irradiation has been investigated using potassium ferrate as electron acceptors. The results showed that the stability of Fe(VI) is dependent on pH significantly, and the stability reduces obviously in the presence of UV-TiO2. The experiments indicated that Fe(VI) could effectively scavenge the conduction band electrons from the surface of TiO2. The photocatalytic oxidation of sulfonamides with Fe(VI) was found to be much faster than that without Fe(VI). The SD, SM, and SMX concentration was greatly reduced by 89.2%, 83.4%, and 82.0%, respectively, after 10 min with UV-TiO2-Fe(VI), comparing to 65.2%, 66.0%, and 71.9%, respectively, with Fe(VI) only in the dark and 71.3%, 72.7%, and 76.0%, respectively, with UV-TiO2. The pH value of solution significantly influenced the sulfonamides degradation in UV-TiO2-Fe(VI) system. The degradation amount of sulfonamides after 10 min was a maximum at pH 7. The intermediate products of sulfonamides oxidation by UV-TiO2-Fe(VI) were analysed by LC-HESI-MS-MS and the results suggested that a majority of sulfonamides turned into large-molecule products without complete mineralization.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）