LANGMUIR
·
2019
·
IF 3.683
Shan Peng,Weihua Meng,JunXiang Guo,Bo Wang,Zhenguang Wang,Na Xu,Xiaolin Li,Jian Wang,Jianzhong Xu
In this paper, we present a highly efficient, cost-effective, and widely applicable functionalized SiO2/TiO2-polymer based coating to fabricate a translucent, fluorine-free, chemically stable, photocatalytic active, self-healable superhydrophobic coating, which consisted of two mixed functionalized particles (MFP) and polydimethylsiloxane (PDMS) in a proper ratio. Both SiO2 and TiO2 powders were functionalized with PDMS brushes to achieve superhydrophobicity. To maximally optimize its properties, including superhydrophobicity, transparency, and photocatalytic activity, the ratios between MFP with PDMS were carefully studied and optimized. Glass slides coated with this mixed coating (MC) showed translucence with a transparency of 75%. It also presented superior photocatalytic activity and strong UV resistance that could repeatedly degrade organic oil pollutants as many as 50 times, while still maintaining superhydrophobicity even upon exposure to UV light with a high intensity of 80 mW/cm2 for as long as 36 h. When low-surface-tension oils such as dodecane wetted the MC surface, it showed excellent slippery performance and could quickly repel strong acid/alkali/hot water and even very corrosive liquids such as aqua regia. MC achieved extremely stable underoil superhydrophobicity (toward liquids including water, strong acid and base, hot water, etc.) and self-cleaning properties, not only in oils at room temperature but also in a scalded oil environment. Moreover, MC showed self-healable performance after recycled plasma treatment. The stainless steel mesh coated with MC was also used to highly efficiently separate oil–water mixtures. Moreover, harsher liquids including strong acid/alkali solutions/hot water/ice water–oil mixtures could also be successfully separated by the coated mesh. This coating was believed to largely broaden both indoor and outdoor applications for superhydrophobic surfaces.
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CHEMISTRY-A EUROPEAN JOURNAL
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2019
·Vol. 25
·期 45
·10642-10649
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IF 5.16
Jiantao Huang,Jijian Xu,Xiangli Che,Chong Huang
Graphical Clash of titanium oxide : A novel composite structure of TiO 2− x with conductive TiO layer is synthesized in one step by an unforeseen dismutation reaction and performs full-spectrum absorption. Black TiO 2− x attracts enormous attention due to its large solar absorption and improved conductivity. In this work, a novel structure of TiO 2− x with conductive TiO layer, performing full-spectrum absorption, was synthesized in one step by the unforeseen dismutation reaction of titanium sub-oxides (Ti n O 2 n −1 ) in ammonium halide atmosphere. For this new reaction, a possible mechanism of decomposition-etching-disproportionation-rehydrolysis process was proposed. The vital intermediate reactant TiCl 4 , which verifies the assumption, has been captured in the form of (NH 4 ) 2 TiCl 6 , especially where Ti 2 O 3 is the reactant. Furthermore, this work not only can nominate TiO as an alternative for noble metals or carbon materials in the aim to improve the electron conductivity and solar absorption of black TiO 2− x , which are important in electrochemistry and optoelectronics fields, but also can be a new route to synthesize special structures for other multivalent transition metals.
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Science China-Technological Sciences
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2019
·Vol. 62
·期 7
·1217-1223
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IF 2.18
Miao Xiao,Han Lu,Wang Lei,Wang Min,Sun XiaoHui,Zhu XiaoTao,Ge Bo
The traditional superhydrophobic materials are not ideal for treating residual pollutants after oil-water separation. In this paper, a simple and economical method was developed for the fabrication of multi-functional superhydrophobic materials PDVB x /TiO 2 composites, through in situ polymerization. The performance of the superhydrophobic composite was studied. The results showed that the low surface energy of PDVB 2.5 /TiO 2 composite with the micro-nano scale roughness would result in excellent superhydrophobicity. In addition, the PDVB 2.5 /TiO 2 composite exhibits optimum effect on the degradation of methyl orange (MO) with the degradation efficiency of 97.8%. What is more, the applications of the composite materials could be expanded to other fields, such as the degradation of drug ciprofloxacin hydrochloride (CIP). Finally, we expanded the application of the PDVB x /TiO 2 composites to tribology, and found its excellent performance in reducing wear and antiwear.
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Chemistry-An Asian Journal
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2019
·Vol. 14
·期 9
·1557-1569
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IF 3.698
Xiaoyan Wang,Dong Zhao,Chao Wang,Yonggao Xia,Wenshuai Jiang,Senlin Xia,Shanshan Yin,Xiuxia Zuo,Ezzeldin Metwalli,Ying Xiao,Zaicheng Sun,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng
Graphical The Matrix Reloaded 2 : In situ synthesized super-small TiO 2 and nickel nanoparticles uniformly embedded in the carbon matrix effectively improve the electrochemical performance as both lithium-ion and sodium-ion battery anodes due to a significantly enhanced charge-carrier mobility by the nickel nanoparticles. Super-small sized TiO 2 nanoparticles are in situ co-composited with carbon and nickel nanoparticles in a facile scalable way, using difunctional methacrylate monomers as solvent and carbon source. Good control over crystallinity, morphology, and dispersion of the nanohybrid is achieved because of the thermosetting nature of the resin polymer. The effects of the nickel nanoparticle on the composition, crystallographic phase, structure, morphology, tap density, specific surface area, and electrochemical performance as both lithium-ion and sodium-ion battery anodes are systematically investigated. It is found that the incorporation of the in situ formed nickel nanoparticles with certain content effectively enhances the electrochemical performance including reversible capacities, cyclic stability and rate performance as both lithium-ion and sodium-ion battery anodes. The experimental I-V profiles at different temperatures and theoretical calculations reveal that the charge carriers are accumulated in the amorphous carbon regions, which act as scattering centers to the carriers and lower the carrier mobility for the composite. With increasing nickel content, the mobility of the charge carriers is significantly increased, while the number of the charge carriers maintains almost constant. The nickel nanoparticles provide extra pathways for the accumulated charge, leading to reduced scatterings among the charge carriers and enhanced charge-carrier transportation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Yuan Yao,Mingxuan Sun,Zihan Zhang,Xiaojing Lin,Bowen Gao,Sambandam Anandan,Wei Liu
A ternary composites of MoO 3 /Ag/TiO 2 nanotube arrays were synthesized by in-situ annealing of TiO 2 nanotube arrays impregnated with AgNO 3 over MoO 3 powders. During the annealing process , the crystallization of the TiO 2 nanotubes, the thermo-decomposition of AgNO 3 to Ag nanoparticles , and the sublimation of MoO 3 occur jointly. The photoelectrochemical measurements of the resultants indicate that MoO 3 /Ag/TiO 2 nanotube arrays present better photoelectrochemical properties compared with Ag/TiO 2 nanotube arrays and pristine TiO 2 nanotube arrays. Especially, the highest photocurrent and open circuit voltage are up to 21.29 μA/cm 2 and 0.058 V under visible light irradiation , whereas 1.77 and 3.87 times larger than those of TiO 2 nanotube arrays, respectively. Superior photoelectrochemical stability and larger photo-conversion efficiency of the ternary composites are also demonstrated. The improved photoelectrochemical properties are related to the close interfacial contact among MoO 3 , Ag, and TiO 2 as well as the surface plasma resonance of Ag in the ternary composites, which broaden the range of light response and enhance the efficiency of charge separation. This study provides a skillful solution to construct TiO 2 -based composite materials and demonstrates it is an unique architecture to promote the visible light driven photocatalytic application of TiO 2 .
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Nanomaterials
·
2019
·Vol. 9
·期 3
·393
·
IF 4.034
Weili Li,Hongchao Geng,Lu Yao,Kesheng Cao,Pengtao Sheng,Qingyun Cai
Here we present the photoelectrocatalytic hydrogen generation properties of CdS passivated ZnCuInSe (ZCISe) quantum dots (QDs) supported by TiO2nanowires decorated with Ag nanoparticles. In this configuration, Ag nanoparticles were sandwiched between the photo-electrons collector (TiO2) and photo-sensitizers (ZCISe), and acted as an electron relay speeding up the charge carrier transport. ZCISe and CdS enabled the optical absorption of the photoelectrode ranging from ultraviolet to near infrared region, which significantly enhanced the solar-to-chemical energy conversion efficiency. A photocurrent of 10.5 mA/cm2and a hydrogen production rate of about 52.9 μmol/h were achieved under simulated sunlight (1.5 AG).Keywords:ZCISe QDs;TiO2nanowires;photocatalytic;hydrogen generation
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Xiya Wang,Zhaoguo Zhang,Zhengfeng Huang,Peimei Dong,Xiaoxiao Nie,Zhi Jin,Xiwen Zhang
The photoreduction of CO 2 by using Ho and N co-doped TiO 2 was explored. The doping elements can further improve the separation efficiency of photogenerated electron-hole pairs via refining grains, causing lattice distortion and adsorbing more hydroxyl radicals(·OH). We found that there exists product selectivity such that the photoreduction products of Ho/N-TiO 2 mainly consist of CO and methanol, while the counterparts of pristine TiO 2 are CO and methane. The possible mechanism of CO 2 reduction is depicted involving the generation and combination of specific radicals. Thus, the amount of ·OH adsorbed on the surface of the catalyst makes a significant difference in the selectivity in the reduction products. Ho/N-TiO 2 catalyst with the synergic effect of Ho and N showed the best photoreductive performance for CO 2 with H 2 O to CO and CH 4 , and its formation rate of CH 4 was 29 μmol/gcatal./hour.
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Materials
·
2019
·Vol. 12
·期 16
·2630
·
IF 2.972
Yuyao Zhang,Jun Li,Wenyao Li,Danning Kang
TiO2is regarded as a prospective electrode material owing to its excellent electrochemical properties such as the excellent cycling stability and the high safety. However, its low capacity and low electronic conductivity greatly restrict the further improvement in electrochemical performance. A new strategy was put forward to solve the above defects involved in TiO2in which the low capacity was enhanced by nanomerization and porosity of TiO2, and the low electronic conductivity was improved by introducing Ag with a high conductivity. One-dimensional mesoporous Ag nanoparticles-embedded TiO2nanofibers (Ag@TiO2nanofibers) were successfully synthesized via a one-step electrospinning process combined with subsequent annealing treatment in this study. The microstructure and morphology of mesoporous TiO2@Ag nanofibers were confirmed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption. TiO2nanofibers mainly consisted of a large amount of anatase TiO2, accompanied with traces of rutile TiO2. Ag nanoparticles were uniformly distributed throughout TiO2nanofibers and promoted the transformation of TiO2from the anatase to the rutile. The corresponding electrochemical performances are measured by galvanostatic charge-discharge, cycle stability, rate performance, cycle voltammetry, and electrochemical impedance spectroscopy measurements in this research, with pristine TiO2nanofibers as the reference. The results indicated that the introduction of Ag nanoparticles into TiO2nanofibers significantly improved the diffusion coefficient of Li ions (5.42 × 10−9cm2⋅s−1for pristine TiO2, 1.96 × 10−8cm2⋅s−1for Ag@TiO2), and the electronic conductivity of TiO2(1.69 × 10−5S⋅cm−1for pristine TiO2, and 1.99 × 10−5S⋅cm−1for Ag@TiO2), based on which the comprehensive electrochemical performance were greatly enhanced. The coulombic efficiency of the Ag@TiO2nanofibers electrode at the first three cycles was about 56%, 93%, and 96%, which was higher than that without Ag (48%, 66%, and 79%). The Ag@TiO2nanofibers electrode exhibited a higher specific discharge capacity of about 128.23 mAh⋅g−1when compared with that without Ag (72.76 mAh·g−1) after 100 cycles at 100 mA·g−1. With the current density sharply increased from 40 mA·g−1to 1000 mA·g−1, the higher average discharge capacity of 56.35 mAh·g−1was remained in the electrode with Ag, when compared with the electrode without Ag (average discharge capacity of about 12.14 mAh·g−1). When the current density was returned to 40 mA·g−1, 80.36% of the initial value was returned (about 162.25 mAh·g−1) in the electrode with Ag, which was evidently superior to that without Ag (about 86.50 mAh·g−1, only 55.42% of the initial value). One-dimensional mesoporous Ag@TiO2nanofibers can be regarded as a potential and promising candidate as anode materials for lithium ion batteries.Keywords:electrospinning;titanium oxide;sliver;mesoporous nanofibers;lithium ion battery
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Journal of Materials Research and Technology-JMR&T
·
2019
·
IF 3.327
Yangguang Yao,Jianhui Yuan,Xiaoxiao Chen,Liming Tan,Qingshan Gu,Wenjie Zhao,Jieshi Chen
Tungsten oxide (WO 3 ) is one of the most promising gas-sensitivity materials owing to its high decomposition temperature and stability of microstructure. The doping of oxides can significantly improve its gas-sensitivity properties. In this paper, WO 3 based coatings doped with TiO 2 were prepared via plasma spraying technology by using mixed feedstock suspensions containing a precursor as WCl 6 and a certain ratio of nano-TiO 2 . The characterization of microstructures and properties of the TiO 2 –WO 3 composite coatings were achieved and the gas sensitivity mechanism was researched. During the suspension plasma spraying, the solvent of the precursor droplets was evaporated and then the nucleation, crystallization and growth of WO 3 occurred. The crystallinity and crystal grains of WO 3 increased observably as the plasma spraying power improved. With the increase of TiO 2 in coatings, the average grain size of the TiO 2 –WO 3 composite coatings decreased at first and then increased. And the gas-sensitive properties of the composite coatings were significantly better than the pure WO 3 coatings. The gas-sensitive properties improvement of TiO 2 –WO 3 composite coatings doped with TiO 2 was firstly caused by the decrease of grains size, which leaded to an increase of the gas adsorption sites. And the Fermi level effect of the composite metal oxide heterojunction formed by TiO 2 and WO 3 also markedly enhanced the gas sensitivity properties of the composite coatings.
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ACS Omega
·
2019
·
IF 2.584
Bin Ou,Jixiao Wang,Ying Wu,Song Zhao,Zhi Wang
In this study, mineralization of organic pollutants in polyaniline (PANI) wastewater was achieved by a combination of photoelectro-Fenton (PEF) and heterogeneous photocatalysis with black TiO2 nanotubes. Organics were decomposed by the •OH radicals and SO4–• radicals formed on the black TiO2 nanotube photocatalyst and at the IrO2/Ti anode during water oxidation and from the Fenton’s reaction between Fe2+ and generated H2O2. Poor chemical oxygen demand (COD) removal was obtained utilizing visible light/TiO2, anodic oxidation with generated H2O2 (AO-H2O2), visible light/black TiO2/AO-H2O2, and electro-Fenton. The mineralization was strongly increased by the PEF/black TiO2 process because of the photolysis of products under visible light irradiation; it was improved by coupled heterogeneous photocatalysis due to the additional •OH radicals at the black TiO2 nanotube surface. The results demonstrated that about 96.4% COD and 85% total organic carbon of PANI wastewater were removed after 360 min by the PEF/black TiO2 process under the optimal conditions. The black TiO2 nanotubes exhibited good stability as the mineralization ratio in 360 min which was still above 80% after 10 cycles’ degradation, showing that the black TiO2 nanotubes are powerful and promising photocatalysts for improving the removal efficiency of PANI wastewater.
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RSC Advances
·
2019
·Vol. 9
·期 21
·11676-11682
·
IF 3.049
Yong Wei,Jijiang Fu,Hao Song,Ben Zhang,Chaoran Pi,Lu Xia,Xuming Zhang,Biao Gao,Yang Zheng,Paul K. Chu
Efficient and stable non-precious metal based electrocatalysts are crucial to the hydrogen evolution reaction (HER) in renewable energy conversion. Herein, CoxP nanoparticles (NPs) are uniformly embedded in N-doped TiO2 nanotube arrays (CoxP/N-TiO2 NTAs) by low-temperature phosphorization of the precursor of metallic cobalt NPs embedded in N-doped TiO2 NTAs (Co/N-TiO2 NTAs) which were fabricated by phase separation of CoTiO3 NTAs in ammonia. Owing to the abundant exposed surface active sites of CoxP NPs, tight contact between the CoxP NPs and TiO2 NTAs, fast electron transfer in N-doped TiO2, and channels for effective diffusion of ions and H2 bubbles in the tubular structure, the CoxP/N-TiO2 NTAs have excellent electrocatalytic activity in HER exemplified by a low overpotential of 180 mV at 10 mA cm−2 and small Tafel slope of 51 mV dec−1 in 0.5 M H2SO4. The catalyst also shows long-term cycling stability and is a promising non-precious metal catalyst for HER.
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Asia-Pacific Journal of Chemical Engineering
·
2019
·Vol. 14
·期 3
·e2309
·
IF 1.396
Zulfiqar Ali,Qiang Lu,Tahir Iqbal,Zulqarnain Arain,Jian Han,Yang-wen Wu,Ding-jia Liu,Yong-ping Yang
Heavy metal Pb is an inevitable ingredient of coal-fired flue gas and has been proven to be a source of inhibiting effect on the selective catalytic reduction (SCR) catalyst. In this paper, two types of Pb-poisoned catalyst, prepared by the incipient wetness impregnation and solid diffusion methods, are studied to unveil the poisoning effects of lead species on the V 2 O 5 -WO 3 /TiO 2 catalyst. The activity test results showed that lead species loaded by the incipient wetness impregnation method exhibited a significant inhibiting effect on the denitrification efficiency of the catalyst although a negligible activity loss was observed on the samples from the solid diffusion method. Characterizations of fresh and Pb-poisoned catalysts from incipient wetness impregnation method were applied using comprehensive techniques such as X-Ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray fluorescence (XRF), NH 3 -temperature programmed desorption (NH 3 -TPD), X-Ray photoelectron spectroscopy (XPS), and so forth. The analytical results indicated that a phase transformation occurred in tungsten species and the amorphous WO 3 converted into PbWO 4 , causing the accumulation and valence imbalance of active vanadium phase, which further decreased the surface acidity and activity of the V 2 O 5 -WO 3 /TiO 2 catalyst.
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