Nanomaterials
·
2018
·Vol. 8
·期 6
·415
·
IF 3.504
Wei Li,Hao Ding,Hua Ji,Wenbin Dai,Jianping Guo,Gaoxiang Du
A photocatalytic active CdS-TiO2heterostructure composite was prepared by hydrothermal method and its morphology and properties were characterized. Results indicate that the CdS nanoparticles deposited on the surface of a TiO2nanoparticles, which was in anatase phase. The particle scale of both of the components reached approximately 15 nm. In comparison to pure TiO2(410 nm), the light absorption edge of the heterostructure composite was 550 nm, which could extend the light response from UV to the visible region. Under visible light irradiation, the degradation efficiency of tetracycline hydrochloride by the CdS-TiO2composite achieved 87.06%, significantly enhancing photocatalytic activity than the as-prepared pure TiO2and commercial TiO2(Degussa P25). This character is attributed to the synergetic effect of these two components in the absorption of visible light.Keywords:CdS-TiO2heterostructure composite;photocatalyst;tetracycline hydrochloride
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Aerzigu Xukeer,Jin Li
In this study, ZnO/TiO 2 nanosheets were synthesized using a hydrothermal method followed by annealing. The resulting hierarchical ZnO–TiO 2 heterostructures exhibited improved gas-sensing performance compared with pure ZnO. We demonstrated that tuning the ratio of Zn to Ti components in the heterostructure allowed us to adjust the sensor stability , with the best- performing sample having a Zn:Ti ratio of 2:1. A notable reduction was observed in both the sensor response and recovery times, down to 22 and 17 s, respectively, by utilizing nanosheet- structured ZnO/TiO 2 heterojunctions. To gain insight into the interaction between the sensing materials and formaldehyde (HCHO) molecules, we performed first-principles calculations to examine the density of states , charge transfer, and energy of adsorption. Our approach to constructing heterogeneous structures contributes to overcoming the low desorption efficiency and slow response-recovery time of pure ZnO for gas-sensing applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2025
·
IF 2.5
Li Lingyu,Ma Qian,Zhao Dongheng,Zhang Huayushuo,Li Bolong
Recently, the development of an n-pentane-sensing product has always been plagued by the lack of suitable inorganic material with good gas-sensing response and selectivity at low operating temperatures. In this work, Ti-MIL-125-induced one-dimensional tubular In 2 O 3 /TiO 2 heterostructures have been fabricated by a facile electrospinning method and a subsequent heat-treatment process. Obvious morphological evolution from a fibrous to a tubular shape with the presence of In 2 O 3 -TiO 2 heterojunctions can be adjusted by varying the added amount of the Ti-ML-125 component. Compared with pure In 2 O 3 , the optimal In 2 O 3 /TiO 2 composites exhibit a blue-shifted energy band (2.52 eV) and an increased specific surface area (227.70 m 2 /g), as well as the enhanced gas-sensing performance on various concentrations of n-pentane. For example, In 2 O 3 /TiO 2 -3% can not only display excellent long-term stability and humidity stability but also has a high response of 670–100 ppm n-pentanol at 50°C, much larger than that of pure In 2 O 3 (50) at 150°C. Significantly, In 2 O 3 /TiO 2 -3% can still reach the high response of 197–100 ppm n-pentanol at room temperature. According to density functional theory (DFT) calculations, the enhanced gas-sensing mechanism is mainly attributed to the combination of the distinctly increased surface active sites through the regulation of morphology and the introduction of effective In 2 O 3 -TiO 2 heterojunctions, which can be beneficial to improving the surface adsorption/desorption characteristics and the electron transport between n-pentanol and the sensing material interface. Graphical
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2017
·
IF 1.588
Xiaohui Ren,Hui Qiao,Zongyu Huang,Pinghua Tang,Shuhua Liu,Siwei Luo,Hao Yao,Xiang Qi,Jianxin Zhong
Hybridization of WS 2 and TiO 2 by a facile hydrothermal method was realized to construct WS 2 - TiO 2 heterostructure photodetector which exhibits preferable photoresponse activity in association with structural robustness. The relationship between photocurrent density and applied bias potential has also been uncovered. Photoresponse measurements demonstrate the photocurrent density of WS 2 - TiO 2 hybrid nanosheets (HNs) has been greatly improved when compared to that of as-prepared TiO 2 , while the steady current density can achieve 130 nA ∕ cm 2 when applied potential is 1.0 V. Besides that, the stability test exhibits no detectable distinction after processing 15 cycles. The improved photoresponse activities can be attributed into the positive synergetic effect between the WS 2 and TiO 2 . We hope the present work can provide fundamental implementations about WS 2 - TiO 2 heterostructure photodetector, meanwhile, offering it potential availabilities for constructing high-performance photodetectors.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 21
·10591-10598
·
IF 8.867
Xinzheng Yue,Shasha Yi,Runwei Wang,Zongtao Zhang,Shilun Qiu
In the development of photocatalytic hydrogen (H2) production, designing and optimizing photocatalyst nanostructures with efficient charge transfer and separation for catalytically active sites are still a great challenge. Herein, a well-controlled synthetic strategy is developed to prepare an Mo2C/TiO2 hetero-nanostructure, in which the TiO2 3D hierarchical configuration is loaded with highly dispersed Mo2C nanoparticles. This heterostructure achieves the excellent photocatalytic activity of 39.4 mmol h−1 g−1 with its rate ∼25 times higher than that of pristine TiO2. Also, our photocatalysts process excellent long-term durability (>20 h). The impressive photocatalytic H2 activity of Mo2C/TiO2 indicates favourable charge carrier dynamics, as determined by the results of photoluminescence (PL), time-resolved photoluminescence (TRPL), surface photovoltage (SPV), and open circuit potential (OCP) decay curves. Moreover, this study provides a guide for researchers to design new functional materials with excellent hydrogen production activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Colloid and Interface Science Communications
·
2021
·
IF 4.914
Xueqin Wang,Helong Xu,Xiaohang Luo,Ming Li,Man Dai,Qihui Chen,Hua Song
Herein, CeO 2 /TiO 2 heterostructures are synthesized adopt a simple and profitable sol-gel technique. The nanostructures comprised of ultrafine and well-distributed CeO 2 nanoparticles on the TiO 2 surface. The obtained catalysts were characterized via X-ray diffraction, nitrogen adsorption , Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy , photoluminescence spectroscopy, and ultraviolet (UV)-visible spectroscopy tests. The as-prepared heterostructures exhibited a visibly enhanced photodegradation performance using phenol(38 ppm) as the model of organic pollutants . The achieved degradation efficiency was 99.1% under UV-light irradiation for 120 min and the TOC removal was 81.31% when using CeO 2 /TiO 2 as catalyst with the CeO 2 loading of 0.5%. The enhanced property was ascribed to the formation of a heterojunction after coupling CeO 2 with TiO 2 , which could capture the phenol molecules and improve the adsorption properties of the materials. Meanwhile, the heterostructures inhibited photogenic carriers recombination, thereby extending the optical response range. Furthermore, the as-prepared catalysts possessed favorable cycle performances and were reutilized for four cycles with insignificantly reduced property, the degradation rate were decreased slightly to 94.0% with a inappreciable decline in Ce and Ti leaching, suggesting it's preeminent stability and recyclability in the process of photocatalytic .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Ao Jiang,Yuli Di,Shanhua Chen,Dafu Zhang,Xingyu Chen,Zhengdong Zhang,Xinyi Zhang,Qi Dong
The sol-gel method was used to prepare a series of muscovite/TiO 2 heterostructures for photocathodic protection of 304 stainless steels (304SS). The effects of different mass ratio of muscovite to TiO 2 (1:0.5, 1:1 and 1:1.5, denoted as MT-0.5, MT-1 and MT-1.5, respectively) on the crystal phase, grain size, light absorption properties and photoelectrochemical properties of TiO 2 and muscovite/TiO 2 heterostructures were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–visible diffuse reflection spectroscopy (UV–vis DRS). The corrosion resistances and photoelectrochemical properties of the 304SS coated with muscovite/TiO 2 heterostructures (304SS/MT) were studied through corrosion immersion test and electrochemical workstation in 3.5 wt% NaCl solution, respectively. In addition, Tafel curves and the electrochemical impedance spectroscopy (EIS) measurements were carried out to evaluate the photogenerated electron separation and transfer efficiency, and the interfacial charge transfer resistance of the 304SS and 304SS/MT electrodes, respectively. The time-dependent photocurrent responses of the MT-1 heterostructures demonstrated an enhanced photo-generated cathodic protection performance for 304SS substrates under visible light irradiation compared to TiO 2 . A photoinduced potential drop value for 304SS coated with MT-1 in 3.5 wt% NaCl solution was −0.54 V (vs. SCE). After immersion test, the corrosion image analyses of the 304SS, 304SS-MT, and 304SS coated with physically mixed muscovite/TiO 2 samples showed that the 304SS/MT-1 exhibits the best corrosion resistances . After connecting with 304SS/MT-1 in 3.5 wt% NaCl solution, the corrosion current densities ( i corr ) of 304SS increased significantly under the white light illumination, indicating more photoinduced electrons were migrated from the muscovite/TiO 2 heterostructures to the 304SS compared with that from pure TiO 2 . Furthermore, the simulated charge transfer resistance ( R ct ) of 304SS/MT-1 electrode is smaller than that of the 304SS electrode coated with TiO 2 , indicating that there exists an effective separation of the photogenerated electrons and holes, and a fast interfacial charge transfer after coating muscovite/TiO 2 heterostructures.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Lijia Zhao,Shupeng Sun,Su Zhang,Zhi Liu,Baoyu Huang,Nan Wang,Jianwei Zhang,Xiaogan Li
The hollow ZnO @ TiO 2 heterostructured nanospheres were synthesized by hydrothermal method using carbon nanospheres as sacrificed templates. With UV activation, the response of ZnO @ TiO 2 based chemiresistive-type sensors to 10 ppm formaldehyde is 11.02 at room temperature which is 5.48 times larger than that of the pure hollow ZnO. The response and recovery time significantly reduced to 14 s and 16 s. Selectivity, stability and repeatability of the hollow ZnO @ TiO 2 based sensor under UV-activation have also been examined. The sensing mechanism of the sensor to formaldehyde have been investigated by AC impedance spectroscopy , in-situ DRIFTS , and DFT theoretical calculation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jinlei Xie,Yefeng Yang,Haiping He,Ding Cheng,Minmin Mao,Qinxu Jiang,Lixin Song,Jie Xiong
Heterostructured semiconductor nanostructures have provoked great interest in the areas of energy, environment and catalysis. Herein, we report a novel hierarchical Ag 3 PO 4 /TiO 2 heterostructure consisting of nearly spherical Ag 3 PO 4 particles firmly coupled on the surface of TiO 2 nanofibers (NFs). The construction of Ag 3 PO 4 /TiO 2 heterostructure with tailored morphologies, compositions and optical properties was simply achieved via a facile and green synthetic strategy involving the electrospinning and solution-based processes. Owing to the synergetic effects of the components, the resulting hybrid heterostructures exhibited much improved visible light photocatalytic performance, which could degrade the RhB dye completely in 7.5 min. In addition, the coupling of Ag 3 PO 4 particles with UV-light-sensitive TiO 2 NFs enabled full utilization of solar energy and less consumption of noble metals, significantly appealing for their practical use in new energy sources and environmental issues. The developed synthetic strategy was considered to be applicable for the rational design and construction of other heterostructured catalysts.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Energy Technology
·
2024
·Vol. 12
·期 3
·2301166
·
IF 3.6
Yanyi Liu,Jian Wei,Xinyu Qiao,Xueting Li,Hao Zhang,Houfei Xiong
Lithium–sulfur (Li–S) batteries are favored as ideal batteries for next-generation electrical stored energy systems owing to their high theoretical energy diversity and low operating costs. Therefore, the development of Li–S batteries with excellent rate capability and stable cycling is still a challenge. In this article, the electrochemical performance of lithium–sulfur batteries with high capacity and long cycle stability is achieved through dual physical and chemical adsorption effects using polypyrrole (PPy) attached to Co 3 O 4 /TiO 2 heterojunction structures based on metal–organic frameworks (MOFs) backbone materials. Co 3 O 4 /TiO 2 polyhedra form a built-in electric field, which is also a good adsorbent for polysulfides PPy nanotubes have a vacant structure, thus minimizing the volume expansion during deformation and maintaining the stability of the structure. The reversible specific capacities of lithium–sulfur batteries prepared based on Co 3 O 4 /TiO 2 /PPy electrodes are 1095 and 739.4 mAh g −1 at 0.1 C and 1 C multiplicity, respectively, and the capacity retention rate is 77.84% after 500 cycles at 1 C multiplicity. The structural design of the S@Co 3 O 4 /TiO 2 /PPy anode demonstrates an excellent ability to limit LiPS and has great potential to provide a promising avenue for the practical application of lithium–sulfur batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 13
·H1087
·
IF 3.014
Yongzhen Shen,Xiaohui Ren,Xiang Qi,Jie Zhou,Zongyu Huang,Jianxin Zhong
The exploration of high efficient eletrocatalysts for hydrogen evolution reaction (HER) is a challenge as well as an opportunity for future applications in renewable sustainable energy. In this paper, a two-dimensional laminate MoS2/TiO2 heterostructure, in which the MoS2 nanosheet is loaded with TiO2 nanoparticles, have been synthesized via a facile hydrothermal process. The as-prepared MoS2/TiO2 electrode demonstrates improved electrocatalytic performance compared to bare MoS2 or TiO2 electrodes. Subsequently, a series of characterization techniques including X-ray diffraction and Raman spectroscopy are carried out to confirm crystallization of MoS2/TiO2 hybridization. Additional morphological and microstructural tests verify a distinct MoS2 framework, indicating a relative stability of MoS2 nanosheet platform. Electrochemical measurements reveal the overpotential and Tafel slope of as-prepared MoS2/TiO2 electrode are −185 mV and 46 mV/dec, which are very close to that of Pt electrode. The HER improvement is proposed to be attributed to the increase conductivity which derives from the reactive MoS2 layer structure, as well as the synergic effect of MoS2/TiO2 heterostructure. We hope this work could provide a novel prototype for the efficient hybrid HER catalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 13
·9176-9185
·
IF 4.449
Xin Li,Huiming Lin,Xiang Chen,Hao Niu,Jiuyu Liu,Ting Zhang,Fengyu Qu
The design and synthesis of unique novel heterostructures for high-performance photocatalytic activity has exerted a tremendous fascination and has recently attracted intensive attention. In this work, a branch-like α-Fe2O3/TiO2 heterostructure has been synthesized controllably through an electrospinning method combined with a hydrothermal approach. The backbone of the heterostructure is composed of a 3D porous TiO2 nanofiber (∼70 nm in diameter) network with plenty of α-Fe2O3 nanorods (100–200 nm in length) deposited on them. The novel branch-like nanocomposites have an abundantly porous structure as well as large surface areas (up to 42.8 m2 g−1). In addition, their visible light photodegradation behaviour towards organic dyes, including Congo red (CR), methylene blue (MB), eosin red (ER) and methyl orange (MO), was investigated. Their excellent photocatalytic performances are attributed to their large surfaces, improved visible light absorption and high separation efficiency of the photogenerated electrons/holes. Furthermore, the degradation process was further studied by varying the amount of α-Fe2O3 deposited. The sample α-Fe2O3/TiO2-3 possessed the best performance to efficiently decolor CR solution even at a high concentration of 50 mg L−1 (160 min, 94 mg g−1), ascribed to the high adsorption capacity derived from the large surface, strong electrostatic interaction and structural match between α-Fe2O3/TiO2-3 and CR. These α-Fe2O3/TiO2 heterostructures exhibit great potential for decontamination of organic pollutants in waste water under visible light.
研究领域:
材料科学
·
环境科学
✓ 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）