NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 22
·13968-13973
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IF 3.269
Bing Zhang,Xuehua Yin,Deshuai Zhen,Wenhong Gu,Yingju Liu,Qingyun Cai
A metal–semiconductor heterojunction material was synthesized by electrodepositing Au nanoparticles onto the surface of WO3 nanoflowers that were grown on TiO2 nanotubes and applied, for the first time, to the surface-enhanced Raman scattering (SERS) detection of dyes. Owing to their nanoflower structure, a localized surface plasmon resonance was generated on the surface of the Au/WO3/TiO2 nanosheets, which brings about multiple enhanced three-dimensional electromagnetic fields. An enhanced factor of 3.6 × 106 was achieved. The spot-to-spot change in the SERS intensity was less than 15% and the SERS substrate could be preserved for at least 50 days. The analysis of dyes in real samples provided a recovery rate of 94.33–115.6%, indicating its potential applications in environmental analysis.
研究领域:
材料科学
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环境分析
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Yang Li,Hairun Ma,Wenyu Xie,Jiahao Liang,Min Li,Shaohui Guo,Guangxu Yan
The short service life and low catalytic activity of electrodes are the major bottlenecks limiting the practical applications of current electrocatalytic oxidation technology in wastewater treatment. In this study, a novel Ti/SnO 2 -Sb-Nd-Pt electrode loading TiO 2 nanotube (TiO 2 -NTs) array was proposed and prepared. The optimized TiO 2 nanotube (TiO 2 -NTs) arrays provided abundant anchoring sites for SnO 2 -Sb-Nd-Pt active coating and improved the bonding strength between the Ti matrix and the SnO 2 -Sb-Nd-Pt active coating as a mediator, as a result, higher electrocatalytic performance and stability. The nitrobenzene (NB) removal and service life were significantly higher in Ti/TiO 2 -NTs/SnO 2 -Sb-Nd-Pt (91.08 % and 4381.9 days) when compared to Ti/SnO 2 -Sb-Nd-Pt (80.61 % and 1151.2 days). In addition, the outstanding electrocatalytic performance of Ti/TiO 2 -NTs/SnO 2 -Sb-Nd-Pt with an oxygen evolution potential of 2.03 V and total voltametric charge of 5.88 mC cm −2 makes it a promising candidate for future industrial applications. These findings will lay a solid foundation for broadening the applications of well-defined TiO 2 -NTs arrays prepared via the two-step anodization.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Physical Chemistry C
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2024
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IF 3.3
Tongxin Xiao,Xige Wu,Hongbao Liang,Kangyue Qiao,Ying Chen
Solar-powered photocatalytic conversion of CO2 into green solar fuels is one of the effective ways to solve the global energy crisis and the greenhouse effect. A new artificial photosynthesis system composed of TiO2 nanotube arrays (TiO2NTs) and bimetallic porphyrin was fabricated, and their photocatalytic activities were evaluated by the reduction of gas-phase CO2 to CH4 under simulated solar irradiation. Compared to pure TiO2NTs and CoTCPP/TiO2NTs, bimetallic porphyrin-sensitized TiO2NTs displayed greatly ameliorated photocatalytic activity. Among them, Ni-CoTCPP/TiO2NTs exhibited the highest photoreduction efficiency, and the reduction rate of CO2 into CH4 was up to 52.27 μmol/cm2/h with the quantum efficiency of 1.002%, about 7 times higher than that of pure TiO2NTs. The increase in photocatalytic performance can be attributed to the enhancement of the light absorption capacity of Ni-CoTCPP/TiO2NTs and the higher charge separation efficiency. Furthermore, according to the results of the photocatalytic evaluation and photo(electro)chemical studies, a possible mechanism of CO2 photoreduction over Ni-CoTCPP/TiO2NTs was proposed.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
Nanoscience and Nanotechnology Letters
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2018
·Vol. 10
·期 1
·51-59
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IF 2.917
Guo Min,Yang Lu,Zhang Jun,Su Haijun,Liu Lin,Chen Jia,Fu Nianqing
To achieve highly efficient visible-light photocatalysis, a new composite photocatalyst was designed and constructed for the first time in this study by coupling novel TiO2 nanotube photonic crystals (TiO2 NT PCs) with localized surface plasmon resonance (LSPR)
of gold nanoparticles (Au NPs). Due to the synergistic effect of slow photon and LSPR which originated from TiO2 NT PCs and Au NPs respectively, the photocatalyst could expand the light absorption spectrum, thus enhancing photocatalysis efficiency in the visible light region. Compared
to its bare TiO2 NT and TiO2 NT PC counterparts, the optimized Au NPs/TiO2 NT PC showed superior performances under the visible light irradiation. Moreover, over 65% Rhodamine B was degraded within 3.5 h by the optimized Au NPs/TiO2 NT PC, while
only 15% and 8% Rhodamine B were degraded within the same time by using Au NPs/TiO2 NT and bare TiO2 NT, respectively. We believe that this work will be helpful in designing of PC-coupled plasmonic nanostructure materials for visible-light-driven photocatalysts, as well
as other photoelectronic applications, such as photoelectrochemical water splitting and photovoltaic.
研究领域:
材料科学
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光催化技术
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纳米科技
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Zhiping Yan,Wenchao Wang,Lili Du,Jixin Zhu,David Lee Phillips,Jingsan Xu
Heterojunctions of CdS quantum dots (QDs)/TiO 2 nanotube arrays (NTAs) were synthesized via a simple vapor transport approach. The 0D/1D QDs/NTAs electrodes exhibited 5-fold improvement efficiency for photocatalytic dye degradation and hydrogen evolution compared to pure TiO 2 NTAs in a photoelectrochemistry cell, which was attributed to the faster transportation and retarded recombination of electron-hole pairs in the 0D/1D heterostructures. Femtosecond transient absorption offers deep insights into the dynamics of the charge carriers, showing that surface-trapped electrons were generated within 1.2 ps. The lifetimes for recombination of electrons at shallow trap sites with holes and deep trapped electrons with holes are prolonged to 73.2 ps and 622.6 ps, respectively. The reduced charge transfer resistance is verified by electrochemical impedance spectroscopy. Mott-Schottky plots indicated downward shifts for both the conduction band and valence band in the heterostructure. Finally, a Z-scheme photoreactive mechanism is proposed to explain the enhanced catalytic activities.
研究领域:
材料科学
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光化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Lingxia Zheng,Xiaoying Ye,Xiaolei Deng,Yongzhi Wang,Yijian Zhao,Xiaowei Shi,Huajun Zheng
Photon absorption, charge separation and transportation, and charge-induced reactions at the active sites are the main crucial factors involved in the photoelectrochemical (PEC) water splitting. Herein, a combination of black phosphorus quantum dot (BPQD) sensitization and defect engineering strategies is employed to optimize the PEC performance of one-dimensional TiO2 nanotube array (NTA) photoanodes. The as-prepared TiO2–x/BP electrode exhibits a strong photocurrent density under simulated solar light irradiation, which is almost ∼3 times higher than that of bare TiO2. Specifically, the photocurrent increment of TiO2–x/BP is even larger than the sum of TiO2–x and TiO2/BP, verifying the synergistic effect of oxygen vacancies and BPQD sensitization. The maximum photoconversion efficiency of TiO2–x/BP is as high as 0.35%, while the value of TiO2 NTAs is calculated to be 0.13%. The results reveal that oxygen vacancies and BPQDs in the TiO2–x/BP composite not only facilitate the charge separation and transportation but also enhance the activity and quantity of reactive sites for water oxidation. The present strategy might open new routes to develop high-performance photoelectrodes for water splitting.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
ANALYST
·
2018
·Vol. 143
·期 20
·5030-5037
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IF 3.864
Qiong Wu,Fengxia Zhang,Huijuan Li,Zhihua Li,Qi Kang,Dazhong Shen
Herein, we report a ratiometric photoelectrochemical (PEC) immunosensor coupled with secondary antibodies–Co3O4 nanoparticle conjugates (Ab2–Co3O4 NPs) for signal amplification. The Ab1-g-C3N4@TiO2 NTs and BSA-g-C3N4@TiO2 NTs act as the sensing and reference photoelectrodes, where Ab1, BSA and TiO2 NTs are the capture antibodies, bovine serum albumin and TiO2 nanotube arrays, respectively. In the presence of target Ag, the sensing PEC photocurrent decreases due to the steric hindrance of Ab1 molecules, which increases the inner resistance of the photoelectrode. The signal-off response is enhanced further using Ab2–Co3O4 NP conjugates due to their steric hindrance effect and the consumption of electron donors by the Co3O4 NPs. Furthermore, the performance of the ratiometric PEC platform is tested using alpha-fetoprotein (AFP) as a model antigen. Under the optimal conditions, the concentration of AFP is detected in the range of 0.4 pg mL−1 to 40 ng mL−1 with a detection limit of 0.2 pg mL−1. This ratiometric strategy is beneficial to improve the reliability and anti-interference ability of PEC immunosensors.
研究领域:
生物医学工程
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分析化学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Chaorui Xue,Ruizhi Xue,Ruirui Huang,Xiangqian Fan,Huinian Zhang,Wenjing Zheng,Ying Li,Ning Li,Qing Chang,Shengliang Hu
Interfacial solar driven water evaporation (ISDWE) technology has been widely studied to desalinate seawater in aiming to alleviate the scarcity of clean water. In this paper, the ISDWE performance of Ti mesh was enhanced by anodized TiO 2 nanotube film and applied voltage, and the water evaporation rate increased from 1.20 kg•m −2 •h −1 to 2.48 kg•m −2 •h −1 . Due to hydrophilic and nanoporous nature of TiO 2 nanotube film, the solar absorptivity, wettability of Ti mesh was improved, the water evaporation enthalpy was reduced, and the water evaporation rate reached 1.98 kg•m −2 •h −1 . For the superior ISDWE performance with applied voltage, electrothermal effect and internal electrical filed were proved to be contributing factors. The solar irradiation can enhance the electrothermal effect for the semiconducting nature of TiO 2 . The internal electrical field can optimize the solar absorptivity and water evaporation enthalpy through doping TiO 2 and breaking water clusters. Moreover, the applied voltage also increased the salt-resistance property of Ti mesh coated with TiO 2 nanotube film. When increasing NaCl concentration, stable water evaporation rate was attainable under 1.2 V, whereas continuous deceleration of water evaporation occurred without external voltage. Therefore, our study provides strategies for achieving high efficient and salt-free seawater desalination by ISDWE technology.
研究领域:
材料科学
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能源技术
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Yan Li,Fang-Ting Liu,Yin Chang,Jian Wang,Cheng-Wei Wang
Structuring the materials in the form of photonic crystals is a new strategy for photocatalytic applications. Herein, a new concept of photonic crystal-induced p-n coaxial heterojunction film photocatalyst of Cu 3 SnS 4 /TiO 2 (CTS/PhC-TNAs) was well-designed and successfully fabricated by combining periodic pulse anodic oxidation and in-situ self-assembling methods Such nanostructured CTS/PhC-TNAs exhibited significantly improved photocatalytic degradation activity under simulated sunlight irradiation with methyl orange (MO) as the target pollutants. Within 120 min, 82% of the MO (10 mg/L) was photodegraded and its kinetic constant per specific surface area reached 0.05332 μmol/m 2 h, which is 1.6 and 12.8 times more quickly than that of PhC-TNAs and CTS, respectively. Its significantly enhanced photocatalytic activity could be mainly attributed to a joint effect of the unique photonic crystal property of PhC-TNAs and the nanostructured hollow p-n coaxial hetero-junction, which result in an increased efficiency of charge separation and transfer and also an improved spectral response capability. This photonic crystal film photocatalyst has the potential for enhancing the photocatalytic activity via further optimizing the photonic stop band of PhC-TNAs. The study presents a new means to design the kind of photonic crystal structural-induced novel photocatalysts with high photocatalytic activities in pollution treatment.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Jianjun Liao,Shiwei Lin,Yue Yang,Kai Liu,Wencai Du
In organic electrochemical transistor (OECT) based glucose sensors Pt-based electrodes are usually used as the gate electrodes due to its excellent electrocatalytic activity. In this paper, a cheap and biocompatible material, TiO 2 nanotube arrays (TNTAs), was used as the gate electrode of the OECT device for the first time. It is encouraging that the sensing performance of OECTs using TNTAs-based gate electrodes is comparable to or better than those of the previously reported OECTs using Pt-based gate electrodes. Highly sensitive and selective OECT devices can be obtained by modifying TNTAs electrodes with Pt nanoparticles (Pt-NPs) and enzyme (glucose oxidase). The device shows a linear response to the logarithm of glucose concentration over the range from 100 nM to 5 mM, and the detection limit as low as 100 nM was achieved, which is three orders of magnitude lower than that of a conventional electrochemical measurement with the same electrode. On the other hand, the glucose can be selectively detected in the presence of interferences, such as ascorbic acid and uric acid, when the gate electrode is modified with Nafion. Moreover, the device presents a good stability and reproducibility. By modifying with other specific enzymes and nanomaterials, it is expected that many other type of enzyme sensors with high sensitivity and selectivity could be realized.
研究领域:
生物医学工程
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材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 3
·2867-2876
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IF 1.798
Yu Libo,Li Zhen,Song Hai
Based on translucent TiO 2 nanotube (NT) film, CdS quantum dots (QDs) were anchored onto TiO 2 NT film using different linker molecules including thioglycolic acid (TGA), mercaptopropionic acid (MPA) and cysteine via hydrothermal method. The CdS QDs sensitized TiO 2 NT (CdS/TiO 2 NT) electrodes were constructed to quantum dots-sensitized solar cells (QDSSCs). The photovoltaic performance analysis results of the QDSSCs show that the linker molecule plays a significant role in the solar cell performance. The QDSSC using cysteine as linker molecule exhibits best power conversion efficiency than the other QDSSCs using TGA or MPA as linker molecules. The incident photon-to-current conversion efficiency (IPCE) and the electrochemical impedance spectroscopy (EIS) analysis results indicate that amino group of cysteine may has two aspects of the role to improve the power conversion efficiency of the QDSSC, one is that the good charge transfer properties of the cysteine might depend on the good donor–acceptor abilities of the free electron pair of the amino group, another is that distance between the TiO 2 NT and the CdS QDs could be slightly decreased due to the cysteine could anchor the CdS QDs via both amino and thiol group.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
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IF 4.803
Hong Xiao,Wenjun Guo,Bin Sun,Meishan Pei,Guowei Zhou
A series of mesoporous TiO 2 nanotubes/reduced graphene oxide (TiO 2 NT/RGO) and Co-doped TiO 2 NT/RGO composites were synthesized via a hydrothermal method. In this method, graphene oxide (GO) was reduced to RGO, whereas TiO 2 NT and Co-doped TiO 2 NT were prepared using poly(ethylene-glycol)-block-poly(propy glycol)-block-poly(ethylene-glycol) as a structure-directing agent through a simple solvothermal route. Their morphology and properties were determined using X-ray diffraction, field emission scanning electron microscopy, UV–vis diffuse reflectance spectra, and Raman measurement. Results indicated that TiO 2 NT displayed mesoporous structures with lengths ranging from about 3 μm to 10 μm, tube diameters ranging from about 400 nm to 600 nm, wall thickness of about 250 nm, and mesoporous walls of about 6 nm. The electrochemical performance of the TiO 2 -based electrodes for supercapacitor was confirmed by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge–discharge in 0.5 mol L −1 Na 2 SO 4 aqueous electrolyte solution. The Co-doped TiO 2 NT/RGO composite electrode with 10.00 wt.% GO exhibited a specific capacitance of 27.5 F g −1 at a current density of 0.2 A g −1 in a symmetrical two-electrode cell, whereas the specific capacitance of TiO 2 was 0.7 F g −1 . The Co-doped TiO 2 NT/RGO composite electrode exhibited high rate capability and excellent long-term cycle stability. The outstanding performance of the Co-doped TiO 2 NT/RGO composite electrode was attributed to the synergistic effects on capacitive behavior of Co-doped TiO 2 NT combined with high electronic conductivity of the RGO sheets.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
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