Nanomaterials
·
2023
·Vol. 13
·期 7
·1144
·
IF 5.3
Jinbao Li,Sha Fan,Huijuan Xiu,Haiwei Wu,Shaoyan Huang,Simin Wang,Dingwen Yin,Zili Deng,Chuanyin Xiong
Silicon-based anode materials are considered one of the highly promising anode materials due to their high theoretical energy density; however, problems such as volume effects and solid electrolyte interface film (SEI) instability limit the practical applications. Herein, silicon nanoparticles (SiNPs) are used as the nucleus and anatase titanium dioxide (TiO2) is used as the buffer layer to form a core-shell structure to adapt to the volume change of the silicon-based material and improve the overall interfacial stability of the electrode. In addition, silver nanowires (AgNWs) doping makes it possible to form a conductive network structure to improve the conductivity of the material. We used the core-shell structure SiNPs@TiO2/AgNWs composite as an anode material for high-efficiency Li-ion batteries. Compared with the pure SiNPs electrode, the SiNPs@TiO2/AgNWs electrode exhibits excellent electrochemical performance with a first discharge specific capacity of 3524.2 mAh·g−1at a current density of 400 mA·g−1, which provides a new idea for the preparation of silicon-based anode materials for high-performance lithium-ion batteries.
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Catalysts
·
2023
·Vol. 13
·期 4
·727
·
IF 3.9
Jie Ren,Pingping Yang,Liuliu Wang,Hongyu Chen,Xingyu Lu,Qing Yang,Li Zou,Cheng Huang,Jiale Xie
Photoelectrochemical (PEC) urea splitting is of great significance for urea wastewater remediation and hydrogen production with low energy consumption simultaneously. Nickel hydroxides as electrocatalysts have been widely investigated for urea electrolysis. However, it is an open question how to synthesize highly catalytic Ni(OH)2for the PEC urea splitting. Herein, we take advantage of the instability of metal–organic frameworks (MOFs) to perform an in situ synthesis of Ni(OH)2catalysts on the surface of TiO2nanorod arrays. This transformed Ni(OH)2(T-Ni(OH)2) possesses a superior PEC catalytic activity for water/urea splitting in comparison to the Ni(OH)2prepared by the impregnation method. The in situ transition of a Ni-MOF is accomplished through an electrochemical treatment under AM1.5G illumination in a KOH-and-urea mixed electrolyte. The specific transition mechanism of Ni-MOFs is the substitution of ligands with OH−in a 1 M KOH electrolyte and the successive phase transition. The T-Ni(OH)2@TiO2photoanode delivers a high photocurrent density of 1.22 mA cm−2at 1.23 VRHE, which is 4.7 times that of Ni(OH)2@TiO2prepared with the impregnation method. The onset potential of T-Ni(OH)2@TiO2is negatively shifted by 118 mV in comparison to TiO2. Moreover, the decline of photocurrent during the continuous test can be recovered after the electrochemical and light treatments.Keywords:photoelectrochemical urea splitting;urea oxidation reaction;titanium dioxide;metal–organic framework;in situ transition
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zeying Liu,Zixuan Chen,Huaxia Xie,Yali Cui,Hong-Jian Feng,Kai Hua
The antibacterial effect induced by photocatalysis of UV-irradiated TiO 2 has been widely studied. The present work reveals that Ag + implanted TiO 2 film shows significantly enhanced antibacterial activity without the application of UV light. Density functional calculations show that the existence of the implanted Ag + tends to change the electric field leading to a gradient band alignment of TiO 2 near the interface, favoring the charge transfer from the TiO 2 side to the membrane of the bacteria. Our density functional calculations clearly demonstrate the strong evidence of charge transfer channeling from the conduction band of Ag + implanted TiO 2 to the bacteria membrane which produces large amount of reactive oxygen species (ROS, including O 2 •– , H 2 O 2 and •OH). The ROS lead to bacteria death by inducing physiological changes such as membrane break, leakage of intracellular components, protein denaturation and DNA lesions. This work unravels the antibacterial mechanism of Ag + implanted TiO 2 , and contributes furtherly to the rational design and modification of biomaterials by Ag + implantation.
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MOLECULES
·
2023
·Vol. 28
·期 7
·3262
·
IF 4.6
Shuya Xue,Min Shi,Jinye Wang,Jiapeng Li,Guanwei Peng,Jingkun Xu,Yansha Gao,Xuemin Duan,Limin Lu
In this work, TiO2-MXene/poly (3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) composite was utilized as an electrode material for the sensitive electrochemical detection of baicalein. The in-situ growth of TiO2nanoparticles on the surface of MXene nanosheets can effectively prevent their aggregation, thus presenting a significantly large specific surface area and abundant active sites. However, the partial oxidation of MXene after calcination could reduce its conductivity. To address this issue, herein, PEDOT:PSS films were introduced to disperse the TiO2-MXene materials. The uniform and dense films of PEDOT:PSS not only improved the conductivity and dispersion of TiO2-MXene but also enhanced its stability and electrocatalytic activity. With the advantages of a composite material, TiO2-MXene/PEDOT:PSS as an electrode material demonstrated excellent electrochemical sensing ability for baicalein determination, with a wide linear response ranging from 0.007 to 10.0 μM and a lower limit of detection of 2.33 nM. Furthermore, the prepared sensor displayed good repeatability, reproducibility, stability and selectivity, and presented satisfactory results for the determination of baicalein in human urine sample analysis.Keywords:TiO2-MXene;oxygen vacancy;PEDOT:PSS;baicalein;electrochemical sensor
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Materials Today Sustainability
·
2023
·
IF 7.8
Y. Wang,X. Wu,L. Guo,Q. Li,S. Wang
In this study, polylactic acid (PLA) composites with a content of 1 wt% titanium dioxide (TiO 2 ) were prepared by melt extrusion and then annealed in order to further enhance their crystalline properties and barrier properties. It is found that α-crystals with tight packing and a more perfect structure were formed under annealing treatment at a higher temperature. The crystallinity of PLA/1T composites annealed at 115 °C for 60 min reached 34.08%. The mobility of molecular chains in the amorphous region was limited by the increase of the crystalline region and thus reduces the solubility and diffusion coefficient of water. The water vapor barrier properties of the PLA/1T composite annealed at 115°C for 60 min were improved by 22.34% compared with the unannealed one. The structure of the annealed PLA/1T composites is more compact, and the surface roughness decreases, which increases the surface hydrophobicity and water resistance of the composites. The increase in crystallinity leads to an increase in the stiffness of the PLA/1T composite. The tensile properties of the PLA/1T composite were further improved by the annealing treatment. The annealing treatment provides a technical method to balance the water vapor barrier properties and degradation properties of PLA.
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Journal of CO2 Utilization
·
2023
·
IF 7.7
Shibo Yuan,Peng Bai,Yi He,Jiafa Chen,Yicheng Zhao,Yongdan Li
Photocatalytic N-formylation of amines with CO 2 is a promising strategy to convert CO 2 into value-added chemicals sustainably. In this work, a black TiO 2 -supported Cu photocatalyst is prepared through a solvothermal method for the N-formylation of N-methylaniline with NaBH 4 as the reducing agent. Cu nanoparticles and oxygen vacancies are formed on the surface of the photocatalyst after reduction with H 2 , which decreases the band-gap energy and promotes the separation of photogenerated electrons and holes, thereby improving the photocatalytic activity remarkably. A 100 % conversion is achieved after 9 h radiation, and the yield of N -methylformanilide reaches 81 %. Both the amount of NaBH 4 and the pressure of CO 2 show important influences on the activity and selectivity of the photocatalytic process, and the carbon and hydrogen in the aldehyde group are from CO 2 and NaBH 4 , respectively. The photocatalyst also shows promising cycling durability.
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RSC Advances
·
2023
·Vol. 13
·期 9
·5957-5969
·
IF 3.9
Dai Yongheng,Yuan Huayu,Li Jiang,Su Qi,Yi Qianwen,Zhang Yuntao
The construction of direct Z-scheme heterojunctions with high photocatalytic degradation ability is important for wastewater treatment, but there are still many unsolved challenges. In this article, we report the fabrication of a Z-scheme P–TiO2/g-C3N4 (CNPT-X) heterostructure by the calcination method. Under simulated sunlight, CNPT-X composites are found to show excellent degradation performance against sulfonamide antibiotics sulfadiazine (SD), sulfamethazine (SM2), sulfamonomethoxine (SMM), and sulfamethoxazole (SMZ). CNPT-3 (400 mg L−1) can be used to degrade four sulfa antibiotics within 90 min, with a degradation rate as high as 99%, which is higher than that for P–TiO2 and g-C3N4 alone. The internal electron transfer paths and mechanisms for the composites are revealed by ESR radical detection experiments, XPS energy spectrum shifts, valence band positions and active material quenching experiments. Furthermore, the degradation products are analyzed by GC-MS, and four possible degradation pathways for sulfonamide pollutants are proposed. This photocatalyst provides new insights into the fundamental aspects of the photocatalytic degradation mechanism for composite pollutants, as well as new ideas for practical environmental applications.
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FUEL
·
2022
·
IF 8.035
Xu Li,Long Yan,Ziyue Liu,Yuhe Liao,Longlong Ma
Catalytic hydrodeoxygenation (HDO) of oxygenated compounds is essential for chemical refining, which is always carried out under high temperature, hydrogen pressure or/and strong acids. Herein, we developed a novel Pt/TiO 2 (B) catalyst for the ambient HDO process. With the modified organic functional TiO 2 (B) nanosheets, the catalytic activity of Pt/TiO 2 (B) was significantly improved. Through the synergistic effect of highly dispersed Pt species and TiO 2 (B) supports, phenol was efficiently converted into cyclohexane and concomitant cyclohexanol under 50 °C and atmospheric hydrogen without extra acid. The characterizations of catalysts showed that the introduction of organic functional groups not only led to the formation of highly dispersed Pt species, but was also conducive to the yielding of key HDO intermediates. Due to the low C O bond energy of enol intermediates, the HDO of phenol could be carried out at mild conditions through the implementable C O bond cleavage of enol intermediates. This study provides a new understanding of the green HDO process and a novel approach for HDO catalyst development.
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Energy Technology
·
2019
·Vol. 7
·期 7
·1801128
·
IF 3.163
Weicheng Cui,Hongye Bai,Konggang Qu,Fagen Wang,Peng Guan,Dongbo Xu,Weiqiang Fan,Weidong Shi
Kinetics play a critical role in the photoelectrochemical (PEC) system, whereas co-catalysis is mainly responsible for reducing the reaction barrier and facilitates water splitting. Here, the unsaturated Fe sites through the metal-organic framework (MOFs) structure promote the kinetics of water oxidation over TiO 2 are successfully in situ decorated. This heterostructure further helps us to better understand the PEC behaviors of organic–inorganic hybrid systems. MIL-100(Fe), as the typical MOFs model, is facilely achieved by an FeOOH sacrificial template method, a strategy which could anchor the compact and ultrathin MIL-100(Fe) films on the surface of TiO 2 to obtain abundant unsaturated Fe sites. The photocurrent density of MIL-100(Fe)/TiO 2 reaches about 2.4 times at 1.23 V vs reversible hydrogen electrode (RHE) compared with bare TiO 2 , and the incident photon to current conversion efficiency value increases up to 47% (at 390 nm). Furthermore, the photocurrent density of MIL-100(Fe)/TiO 2 is maintained at 84% after 3 h, showing that the organic component of MIL-100(Fe) takes a nature of favorable stability. The configuration of MIL-100(Fe)/TiO 2 will bring a new insight for learning the basic function of unsaturated metal sites in the PEC system.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Guijiao Xia,Hongli Liu,Xiaoming Zhao,Xiaofei Dong,Shirong Wang,Xianggao Li
Electron-selective layers (ESLs) processed at low temperature play a vital role for planar perovskite solar cells (PSCs), especially for flexible devices. In this scheme, a novel strategy namely seeding-method is developed to prepare highly-compact anatase TiO 2 ESLs at dramatically low temperature of 150 °C. This method allows the preparation of anatase TiO 2 via hydrolyzation of Titanium diisopropoxide bis (acetylacetonate) (TiAcAc) induced by TiO 2 crystal seed. Seeding-method permits the hydrolyzation of TiAcAc occurs at just 70 °C to obtain anatase TiO 2 , which is greatly reduced compared with normal procedure where 500 °C is desired . Accordingly, the acquired anatase TiO 2 reacted with hydrochloric acid to prepare Cl-doped TiO 2 (Cl@TiO 2 ). Highly-compact anatase TiO 2 ESLs were formed by spin-coating Cl@TiO 2 onto FTO and then annealed at 150 °C. Power conversion efficiency of planar PSCs based on anatase Cl@TiO 2 ESLs was 15.73%. Seeding-method processed at low temperature can be an effective way to advance the development of flexible perovskite photovoltaic.
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INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Liangfan Qu,Guiyun Chen,Shuang Dong,Yaoxing Huo,Zhonglin Yin,Shuhong Li,Ye Chen
Highly dispersible TiO 2 nanoparticles were prepared through the hydrolysis of titanium alcohol, and a series of TiO 2 -modified zein/chitosan (CS) films were prepared through a process involving blending, solution casting and evaporation. The mechanical properties and the antibacterial capacity of the zein/CS/TiO 2 films were characterized to explore the effects of different TiO 2 nanoparticle contents. Results showed that the addition of nanoscale TiO 2 remarkably improved the mechanical properties and thermal stability of the zein/CS/TiO 2 film. The tensile strength of the zein/CS/TiO 2 films significantly increased (p<0.05) with the increasing TiO 2 loadings in films, reaching a maximum of 28.33 ± 1.53 MPa at 0.15 wt % TiO 2 nanoparticles. The antibacterial effect of the composite films on Gram-positive bacteria ( S. aureus ) was more significant than that of Gram-negative bacteria ( E. coli and S. enteritidis ), and the antibacterial effect of UV light was better than that of dark conditions. In particular, the inhibition zones of zein/CS/TiO 2 (0.15%) film against E. coli , S. enteritidis and S. aureus under UV light condition increased by 21.78%, 21.45%, and 26.44%, respectively, compared with the control. This study suggested that adding highly dispersible TiO 2 nanoparticles is an effective method for improving the mechanical and antimicrobial properties of zein/CS films for various applications, such as medical and food packaging.
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RSC Advances
·
2019
·Vol. 9
·期 2
·721-729
·
IF 3.049
Yu An,Pengwu Zheng,Xiaofei Ma
A novel floating visible-light photocatalyst (HGMs–TiO2/Ag3PO4) composite was prepared using amino modified low-density hollow glass microspheres (HGMs) as carriers to disperse and support TiO2 and Ag3PO4 photocatalysts. The surface morphology, crystal structure and optical properties of the HGMs–TiO2/Ag3PO4 composites were characterized and the Ag3PO4 content on the surface of the microspheres was determined by atomic absorption spectrometry (AAS). Methylene blue (MB) was chose as the organic pollutant to investigate the visible-light catalytic properties of the HGMs–TiO2/Ag3PO4 composites. For HGM composite photocatalysts, when the theoretical mass ratio of TiO2 to Ag3PO4 on the surface of HGMs is 1 : 1.5, the visible-light catalytic activity of the composite is superior to pure Ag3PO4 and a TiO2/Ag3PO4 photocatalyst with a mass ratio of 1 : 1.5 under the same conditions, due to the increased light-contact area and the photocatalytic active sites, since the TiO2 and Ag3PO4 particles can be well dispersed on the surface of the floating HGMs. Furthermore, the deposits of TiO2 and Ag3PO4 on the HGM surface form a heterostructure, facilitating the separation of electron–hole (e− – h+) in the energy band, and elevating the photocatalytic activity and cycle stability of Ag3PO4. This work indicates that floating HGMs–TiO2/Ag3PO4 composites could become a promising photocatalyst for organic dye removal due to the low cost and high visible-light responsiveness.
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