Surfaces and Interfaces
·
2024
·
IF 5.7
Xu Yuan,Wei Wang,Cuiting Du,Qianqian Kang,Zhipeng Mao,Shougang Chen
The present study reports on a composite coating exhibiting noise reduction and anti-corrosion properties. We successfully synthesized a Ti 3 C 2 T x @TiO 2 -PDA composite filler that involves growing porous TiO 2 onto lamellar MXene (Ti 3 C 2 T x) material and further coating both surfaces with a layer of polydopamine (PDA) material, providing the coating material with a micro-cavity structure to enhance its ability to dissipate acoustic energy and resist corrosion. And we incorporated it into the prepared disulfide bond-modified polyurethane coating matrix. Experimental tests and finite element analysis demonstrate that the coating can reduce environmental noise by approximately 33% while maintaining a maximum impedance modulus |Z| of 5.51 × 10 7 Ω·cm 2 after immersion in a 3.5 wt% NaCl solution for 25 days. The porous structure of the composite filler provides micro-cavities within the coating, while its lamellar structure acts as a physical barrier against corrosive media. Furthermore, introducing disulfide bonds enhances acoustic energy dissipation within the coating. Consequently, this coating exhibits exceptional corrosion resistance and noise reduction performance, presenting significant potential for applications in marine equipment's noise reduction and corrosion prevention.
研究领域:
材料科学
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化学工程
·
海洋工程
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Guang Xu,Ying Zhang,Dandan Peng,Donghai Sheng,Yao Zhang,Ye Tian,Di Ma
In this paper, carbon modified porous TiO 2 mixed-phase junction was successfully fabricated by using the MIL-125(Ti)-P25 composite as the precursor. The porous TiO 2 possessed abundant pores and large surface area inherited from its precursor during a simple one-step pyrolysis in a crucible, and the modified TiO 2 showed catalytic activity for photocatalytic cyclohexane oxidation. Moreover, the ratios of anatase/rutile TiO 2 and carbon contents in the modified TiO 2 mixed-phase junction can be regulated conveniently. Among the mixed-phase porous TiO 2 , the C TiO 2 –4 sample containing 12.4 wt% rutile TiO 2 presented the best photocatalytic activity, which was also much better than those of carbon modified pure anatase or rutile TiO 2 . The carbon modification was characterized by carbon doping and surface carbon species, which played the vital role in enhancing the photocatalytic activity of the mixed-phase TiO 2 . Carbon doping into TiO 2 lattice can effectively reduce its band gap energy and extend the light response range. The carbon species on the TiO 2 surface can improve the light absorption efficiency and promote the transport of photogenerated electrons. Free radicals capture experiments demonstrated that •OH and •O 2 − radicals were important active species in the cyclohexane oxidation reaction. This work provides a MOF-mediated P25-assisted synthesis strategy that may guide the design of other photocatalysts.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Lei Chen,Wenting Sun,Zhiying Xu,Minghui Hao,Baojing Li,Xin Liu,Jingjing Ma,Liang Wang,Chunhu Li,Wentai Wang
Low-temperature electrocatalytic reduction of nitric oxide (NORR) is promising for the low-cost, high-efficiency removal and utilization of nitric oxide (NO), which couples the two crucial industrial processes of denitration and synthetic ammonia. We reported a binary catalyst of Cu/P–TiO 2 for NORR process, which took advantages of the Cu electrocatalysts and porous TiO 2 . The increase of surface areas and channels can improve the adsorption of NO molecules. The decoration of the ultrafine Cu nanoparticles on the porous TiO 2 may prevent the agglomeration of ultrafine Cu nanoparticles. The as-prepared Cu/P–TiO 2 electrode exhibits excellent electrocatalytic activity with a Faraday efficiency of 86.49% and NH 3 yield of 3520.80 μg·h −1 ·mg −1 in 0.1 M K 2 SO 4 at −0.3 V vs. RHE. The mechanism of the NORR reaction process with Cu/P–TiO2 catalysts was also discussed. This research may broaden the application areas of TiO 2 -based materials in the electrocatalysis and provide a new sight in the treatment of NO pollutants.
研究领域:
材料科学
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环境科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2017
·
IF 2.059
Chunyan Chi,Jiaqi Pan,Mingzhu You,Zongjun Dong,Weijie Zhao,Changsheng Song,Yingying Zheng,Chaorong Li
The porous TiO 2 nanotubes/Ag 3 PO 4 heterojunction are synthesized via simple electrospining and chemical co-deposition method. The results of SEM, XRD , TEM and XPS imply that the Ag 3 PO 4 nanoparticles have been introduced on to the surface of TiO 2 nanotubes successfully. Compared with the unmodified samples, the photocatalytic activity of the as-prepared porous TiO 2 nanotubes/Ag 3 PO 4 heterojunction exhibit a remarkable enhancement by the degradation of methylene blue (MB) under the sunlight. Further, the Z-Scheme structure of the samples and the porous-tubular structure of the TiO 2 are considered as the main reasons for the enhancement.
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
RSC Advances
·
2018
·Vol. 8
·期 7
·3433-3442
·
IF 2.936
Yumeng Zhou,Lijing Zhang,Shengyang Tao
The preparation of porous TiO2 as a carrier for the Fenton reaction is reported. Porous TiO2 is an excellent carrier to load with elemental iron due to the large specific surface area and negative surface charge. Porous TiO2 was synthesized in the form of a hierarchically porous silica monolith that was used as a microreactor, and a block copolymer served as a template for mesoporous forms. The crystalline TiO2 growing in confined spaces maintained the porous structure and high crystallinity. The surface area of our synthesized porous TiO2 can reach 205 m2 g−1. The zeta potential of the TiO2 was as low as −36.5 mV (pH 7). Elemental iron was highly and uniformly dispersed over the channel of the porous TiO2 via an impregnation method and served as the catalyst for the Fenton reaction. In the Fenton reaction, the synthesized catalyst performed strong catalytic activity during the degradation of wastewater containing an ultrahigh concentration of aqueous dye, at 400 ppm. The aqueous dye solution was degraded over 95% in 30 min, and the catalyst could be reused many times.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Ting Zhao,Ruifeng Qian,Yang Tang,Jing Yang,Yitao Dai,Wan In Lee,Jia Hong Pan
Although considerable progress has been achieved in the preparation of uniform hydrous TiO2 spheres (HTS) through the sol–gel process, there is plenty of room left in tailoring the size and morphology of HTS on the deep-submicron scale or even nanoscale since the diameters of the so far reported HTS are mostly on the (sub)micron scale (0.3–1.2 μm). Here, we develop a novel titanium tetraisopropoxide (TTIP)–organic acid (OA)–acetonitrile (ACN)–methanol (MeOH)–H2O system, which facilitates the control of nanoporous HTS to the range of 50–300 nm. The synthetic parameters including OA, (co-)solvent, concentration of precursor, and reaction temperature are comprehensively optimized, aiming at reproducible preparation and precise size control. Among the various OAs, n-valeric acid presents the best capability in controlling the spherical morphology and size uniformity. The synthesized amorphous HTS containing numerous micropores and mesopores show excellent hydrothermal stability and offer suitable self-template for the subsequent synthesis of mesoporous anatase TiO2 spheres (MAT) with a large surface area of 99.1 m2/g. The obtained TiO2 deep-submicrospheres and nanospheres with tunable sizes show great potential in various research fields.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fei Ye,Houfen Li,Hongtao Yu,Shuo Chen,Xie Quan
Protons tend to bond strongly with unsaturated-coordinate S element located at the edge of nano-MoS 2 and are consequently reduced to H 2 . Therefore, increasing the active S atoms quantity will be a feasible approach to enhance hydrogen evolution. Herein we developed a porous TiO 2 derived from metal organic frameworks (MOFs) as scaffold to restrict the growth and inhibit the aggregation of MoS 2 nanosheets. As a result, the thickness of the prepared MoS 2 nanosheets was less than 3 nm (1–4 layers), with more edges and active S atoms being exposed. This few-layer MoS 2 -porous TiO 2 exhibits a H 2 evolution rate of 897.5 μmol h −1 g −1 , which is nearly twice as much as free-stand MoS 2 nanosheets and twenty times more than physical mixture of MoS 2 with porous TiO 2 . The high performance is attributed to that more active edge sites in few-layer MoS 2 -porous TiO 2 are exposed than pure MoS 2. This work provides a new method to construct MOFs derived porous structures for controlling MoS 2 to expose active sites for HER.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Kaidi Li,Fangfang Zhang,Huiming Wang,Yalan Zhou,Lixin Zhao,Jimin Du,Yating Gao,Weimin Wang,Dae Joon Kang
Here, the lamellar-shaped Bi 2 S 3 grown on a porous TiO 2 monolith was obtained by a two-step method including a sol–gel route and hydrothermal treatment. The photocatalytic activity of the as-synthesized Bi 2 S 3 /TiO 2 composites was evaluated for photodegradation of methylene blue (MB) dye in aqueous solution under the visible-light irradiation. Based on our experimental results, 5% (molar ratio of Bi 2 S 3 to TiO 2 ) Bi 2 S 3 /TiO 2 photocatalysts exhibited a maximum photodegradation rate of MB up to 96.9% under visible-light irradiation for 120 min. Our findings indicated that the lamellar-shaped Bi 2 S 3 can extend the light absorption up to visible areas, and porous TiO 2 can provide enhanced specific surface area and more mass transfer pathway to enhance the photodegradation efficiency. Furthermore, porous TiO 2 can accept the electrons from the Bi 2 S 3 conduction band due to the relatively positive electrode potential to impede the photoproduced electron and hole combination to result in advanced photocatalytic performance.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Jun Shao,Songwang Yang,Lei Lei,Qipeng Cao,Yu Yu,Yan Liu
Pore size and porosity of the porous materials play an important role in catalysis, dye-sensitized solar cells and mesoscopic perovskite solar cells (PSC), etc. Increasing pore size and porosity of mesoporous TiO2 is crucial for facilitating pore-filling of perovskite, charge extraction on TiO2/CH3NH3PbI3 interface and thus cell performance enhancement. Highly porous TiO2 films (TFs) with a large pore size that extends the limit of particle size have been achieved through a novel TiO2 paste using copolymer P123 as a pore-adjusting agent and 2-butoxyethyl acetate as a solvent. A highly porous structure with the pore size of 34.2 nm and porosity of 73.5% has been obtained, the porosity of which is the largest that has ever been reported in the screen-printed TiO2 thick films. The pore size and porosity of TFs can be successively adjusted in a certain range by tuning the P123 content in the pastes. As particle size and surface area of TFs are kept almost constant, the specific investigation on the effect of varied pore size on the performance of bilayer-structured PSCs becomes possible. The hysteresis phenomenon, the notorious problem of PSCs, is found to depend greatly on pore size and porosity of TFs, that is, pore-filling of perovskite. The suppressing effect of highly porous TFs on hysteresis by avoiding charges accumulation on the interface due to enhanced interfacial contact is proved by the invariable photocurrent response after prebias treatment. A hysteresis-free solar cell with an efficiency of 15.47% was achieved by depositing a 242 nm-thick perovskite capping layer upon 350 nm-thick TF with a pore size of 34.2 nm. This method developed for the preparation of highly porous TFs provides a new way to fabricate hysteresis-free PSCs and is widely applicable for the fabrication of other mesoporous metal oxide films with large pore sizes.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ming Luo,Xiao Yu,Wenxia Zhao,Ruimei Xu,Yong Liu,Hui Shen
Extensive efforts have been devoted to developing simple, low-cost, and high-production-yield methods to prepare hybrid materials with desired structural features for high-performance lithium storage. Here, a novel strategy is reported for fabricating the porous TiO2 nanofibers decorated with N-doped carbon (TiO2/C nanofibers) by a combination of mechanical stirring and the addition of a polymer in a beaker at ambient temperature, followed by calcination. The mechanical stirring process can provide homogeneous mixing of reactants in a solution, whereas the polymer acts not only as a structure-directing agent for fabricating one-dimensional nanofibers but also as the carbon and nitrogen source to generate N-doped carbon framework and porous structures. The TiO2/C nanofibers have average diameters of 500 nm and lengths up to 65 μm and are further composed of intercrossed TiO2 nanocrystals with sizes of 8 nm, with micropores centered at 1.5 nm and mesopores at 3–6 nm. The TiO2/C electrodes demonstrated a high reversible capacity (368 mAh g–1 at 0.25C after 200 cycles), good cycling performance (176 mAh g–1 at 10C over 2000 cycles), and excellent rate capability (97 mAh g–1 at 20C).
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Xianfeng Wang,Fuhai Cui,Jinyou Lin,Bin Ding,Jianyong Yu,Salem S. Al-Deyab
This paper describes the detection of formaldehyde through analyses of the resonance frequency signal from quartz crystal microbalance (QCM) sensors coated with a novel organic–inorganic hybrid sensing coating. Nanoporous titanium dioxide (TiO 2 ) fibers with high Brunauer–Emmett–Teller (BET) surface area (68.72 m 2 /g) were fabricated by electrospinning a sol–gel titanium tetraisopropoxide (TIP)/polystyrene (PS) composite solution and following calcination process. Ethylene glycol (EG) dispersed TiO 2 nanofibers were drop casted onto the electrode of QCM, followed by the functionalization of the sensing polyethyleneimine (PEI) on the fibers. The nanoporous TiO 2 fibers covered with PEI layers worked as a highly sensitive sensing interface to provide output signal for weight changes during exposure to formaldehyde vapor. The developed formaldehyde-selective sensors exhibited rapid response and low detection limit (1 ppm) at room temperature . This is because the high specific surface area of the electrospun nanoporous TiO 2 fibers and efficient nucleophilic addition reaction between formaldehyde molecules and primary amine groups of PEI. Our new synthetic methodology promises to be a powerful approach to fabricating hybrid organic–inorganic nanostructures on QCM for gas sensing and chemical analysis.
研究领域:
材料科学
·
环境科学
·
化学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
He Ma,Changhua Wang,Songmei Li,Xintong Zhang,Yichun Liu
Semiconductor oxides are widely used to achieve photocatalytic removal of NO x (NO and NO 2 ) species. These materials also exhibit enhanced oxidation ability in thermally assisted photocatalysis ; however, many of them tend to be deactivated at high relative humidity (RH) levels. In the case of the benchmark P25 TiO 2 photocatalyst, we observe a significant decrease in non-NO 2 selectivity from 95.02% to 58.33% when RH increases from 20% to 80%. Interestingly, the porous TiO 2 (B) microspheres synthesized in this work exhibit 99% selectivity at 20% RH; the selectivity remains as high as 96.18% at 80% RH. The high humidity tolerance of the TiO 2 (B) sample can be ascribed to its strong water desorption capacity and easy O 2 adsorption at elevated temperatures, which reflects the fact that the superoxide radical is the main active species for the deep oxidation of NO x . This work may inspire the design of efficient photothermal catalysts with application in NO x removal in hot and humid environments.
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
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