CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaodong Wu,Sijia Ren,Wenke Hao,Ke Yuan,Hongtong Guo,Yuyan Li,Haozhe Huang,Ran Xie,Kai Zhong,Wen Yan,Xiaodong Shen,Sheng Cui
Developing efficient photocatalysts with low cost, high performance, and high selectivity is essential and imperative for CO 2 conversion and utilization, yet it remains a big challenge. Herein, a novel Ce-doped TiO 2 aerogel with oxygen vacancy anchored on the oriented carbonaceous (Ce–TiO 2 @CS) is synthesized by the sol-gel technique, combined with the freeze casting, supercritical drying technique, and heat treatment processes . The Ce–TiO 2 @CS aerogel has a typical aerogel-like structure, with the Ce–TiO 2 aerogel anchored on the oriented porous carbon , rendering a large BET-specific surface area of 124 m 2 /g, which leads to enhanced photocatalytic activity . The Ce-doping into the pristine TiO 2 results in impurity levels within the band gap, which extends the light response range to the visible light region. In addition, the rapid combination of electrons and holes is prevented via the two-phase microstructures and rapid transfer rate of electrons within the oriented porous carbon. The yields of CH 4 and CO are as high as 9.45 μmol h −1 g −1 and 42.26 μmol h −1 g −1 , respectively, which are 28.6 and 2.46 times higher than those of pristine TiO 2 aerogel under simulated solar spectrum conditions without any sacrificial agents or co-catalysts, The density functional theory (DFT) calculation shows that larger C–O bonds of CO 2 molecule and more negative adsorption energy have occurred on the Ce–TiO 2 @CS aerogel, indicating that the CO 2 activation has been enhanced, which greatly improves the CO 2 photoreduction activity. This work may guide the designing of aerogel-based photocatalysts for CO 2 photocatalytic reduction.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-12
·
IF 5.3
Miao Fengjuan,Lu Yanan,Tao Bairui,Zhao Man,Chu Paul K.
Dual-functional nanomaterial electrodes have the capability to satisfy the requirements for both sweat analysis and the hydrogen evolution reaction (HER), thereby enabling the integration of electrochemical sensing and hydrogen production. In this study, ZIF-67 cubes are synthesized on nickel foam (NF), while TiO 2 is obtained through an annealing process. Subsequently, the ZIF-67@TiO 2 /MoS 2 nanocomposite is fabricated on nickel foam via a hydrothermal method. This composite material exhibits exceptional photocatalytic properties and is also suitable for the detection of glucose in sweat. The glucose detection range spans from 10 nM to 10 mM with a sensitivity of 7.24 μA mM −1 cm − 2 for a signal-to-noise ratio of 3 and a detection limit of 0.43 μM. Moreover, when utilized as a hydrogen evolution electrode, this material demonstrates a current density of 10 mA cm -2 at an overpotential of 118 mV, with a Tafel slope of 73 mV/dec. The synthesis process is both straightforward and economical. This research introduces a novel concept for the design of multifunctional chemical sensors. Graphical Abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
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IF 20.2
Chunxue Wang,Zhao Li,Xin Sun,Yuan Li,Lei Shi,Shunzheng Zhao,Kai Li,Ping Ning,Fei Wang
Ag-based catalysts show high activity in NH 3 -selective catalytic oxidation (NH 3 -SCO). The anchoring states of Ag species determines its valence and dispersion, thereby influencing the performance of Ag-based catalysts. Herein, we elucidated that the content and anchoring strength of the hydroxyl (OH) groups on support together affect the anchoring states of Ag. TiO 2 has few OH groups but high anchoring strength, the anchored Ag is in a highly dispersed oxidized state, while the unanchored Ag is aggregated in a metallic state (Ag 0 ), so it presents an unevenly sized dispersion and mainly in oxidized state. SiO 2 has abundant OH groups but weak anchoring, and can excessively agglomerate into large Ag 0 nanoparticles (Ag 0 NPs). Therefore, the introduction of SiO 2 can regulate the anchoring states of Ag on the TiO 2 support, making Ag presents highly dispersed Ag 0 NPs, thus following a reaction mechanism with lower energy barriers and significantly improving the NH 3 -SCO performance.
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Advanced Healthcare Materials
·
2025
·
IF 9.6
Minggang Yang,Yufan Zhang,Zhenhao Hou,Jianbo Wu,Fuwei Liu,Jun Wu,Kelvin W.K. Yeung,Wenhao Qian,Xuanyong Liu,Liang Kong,Yunpeng Li,Jiajun Qiu,Guocheng Wang
Antibiotic therapy is a key strategy for treating infections associated with orthopedic implants, yet its limited effectiveness and potential to disrupt bone healing highlight the need for innovative approaches. Herein, a TiO 2 -Graphene (TiO 2 -G) metastructure is developed on Ti implant surface using a hydrothermal method coupled with plasma-enhanced chemical vapor deposition (PECVD), showing strong near-infrared light (NIR) absorption. The antibiotic doxycycline (DOX) is successfully loaded onto TiO 2 -G and exhibited enhanced NIR release. The promising antibacterial efficacy is proven by both in vitro and in vivo tests with NIR irradiation for 5 min, which is ascribed to the synergistic photocatalytic activity of TiO 2 -G and NIR-responsive release of DOX. Interestingly, after 5 min of NIR irradiation, the TiO 2 -G metasurface neutralized the immediate negative effects of photodynamics and even upregulated the expression of osteogenic genes (osteocalcin (OPN), osteopontin (BSP), and bone sialoprotein (OCN)), with particularly enhanced effects observed on day 14. Moreover, the sustained release function of TiO 2 -G significantly mitigated the cytotoxicity of free antibiotics with antibacterial capabilities comparable to those of TiO 2 -G/DOX under NIR irradiation for 5 min. Consequently, the in vivo studies proved that the TiO 2 -G metastructure enhanced the osteointegration of the implant even in the absence of infection when loaded with DOX.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Ping Lu,Zixing Gu,Zihan Zhang,Huaneng Su,Qiang Ma,Chunsheng Li,Lei Wei,Qian Xu
The all-in-one E-fueled solar flow battery system that can be recharged with liquid fuel is a new type of power system. It can continuously convert solar energy into liquid fuel without relying on external power supply equipments. However, the interface between the photoanode and the electrolyte often exhibits unsteady behavior, resulting in poor performance of the system. In this work, the {201} facets are selected and the impact of two doping treatment strategies for TiO 2 {201} photoanode on the performance of the E-fueled solar flow battery system is systematically studied through the I-t curve, linear sweep voltammetry, Mott-Schottky plot. The results show that the un-biased photocharging current of bulk-doped TiO 2 can reach 2.7 mA·cm −2 in the battery system test, only relying on the self-built electric field at the interface, and the energy conversion efficiency approaches 2.67 %. In addition, the performance is analyzed by the combination of transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and other characterizations, with the aim of distinguishing the effects of bulk- and surface-doped Mn and accurately revealing the mechanism of their influences from the outside to the inside. Finally, the optimization rules of the un-biased light charging mode of the system are explored.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yaru Zheng,Wei Li,Jie Ju,Jiechao Jiang,Ling Zhang,Hao Jiang,Yanjie Hu,Chunzhong Li
Single-atom catalysts (SACs) have garnered considerable interest in the field of heterogeneous catalysis. This study detail the synthesis of single-atom Pd catalysts supported on metal oxides using the Flame Spray Pyrolysis (FSP) method. This technique allows for the preparation of TiO 2 with abundant oxygen vacancies by incorporating a hydrogen-rich atmosphere at high temperature (>2000 K) utilizing the quenching ring, which enhances the catalyst synthesis process. Additionally, the distribution and electronic structure of Pd were tailored in a hydrogen-rich atmosphere, which promoted the entrapment of Pd atoms within oxygen vacancies, preventing their aggregation into Pd nanoparticles and leading to the formation of Pd-SA/TiO 2 . Notably, Pd-SA/TiO 2 achieves 92.51 % CO 2 -to-CO selectivity in the photocatalytic CO 2 reduction reaction and exhibits an impressive catalytic activity of 56.84μmol g −1 h −1 . This research introduces a novel approach to modulate the anchoring process and optimize the microenvironment for single-atom metal synthesis, advancing the development of the-state-of-the-art SACs.
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ACS Catalysis
·
2018
·
IF 11.384
Guoxue Liu,Wei Li,Ran Bi,Christian Atangana Etogo,Xin-Yao Yu,Lei Zhang
Despite the ultrahigh energy density of rechargeable lithium–oxygen (Li-O2) batteries, their practical use is still hindered by the poor performance of electrocatalysts. Recently, porous and hollow nanostructured catalysts have been found to be promising electrocatalysts toward the ORR/OER to improve the performance of Li-O2 batteries. However, the catalytic activities of the catalysts are still insufficient and the nanopores are easily clogged by the insoluble discharge products. Herein, highly porous and hollow TiO2–x nanoboxes (TiO2–x NBs) with large surface areas, increased oxygen vacancies, and high grain boundary density have been developed as an electrocatalyst for Li-O2 batteries via a cation-assisted synthetic approach. The Li-O2 batteries with TiO2–x NBs as the electrocatalyst exhibit a high specific capacity of 8569 mA h g–1, excellent rate capability, and long cycle life up to 200 cycles when the capacity is limited to 1000 mA h g–1. Moreover, this cation-assisted approach for fine-tuning the nanostructure could be an innovative strategy to design efficient electrocatalysts for high-performance Li-O2 batteries.
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ACS Omega
·
2018
·
IF 0
Zhongwei Fu,Yunyun Zhong,Yuehong Yu,Lizhen Long,Min Xiao,Dongmei Han,Shuanjin Wang,Yuezhong Meng
A new class of TiO2-doped CeO2 nanorods was synthesized via a modified hydrothermal method, and these nanorods were first used as catalysts for the direct synthesis of dimethyl carbonate (DMC) from CO2 and CH3OH in a fixed-bed reactor. The micromorphologies and physical–chemical properties of nanorods were characterized by transmission electron microscopy, X-ray diffraction, N2 adsorption, inductively coupled plasma atomic emission spectrometry, X-ray photoelectron spectroscopy, and temperature-programmed desorption of ammonia and carbon dioxide (NH3-TPD and CO2-TPD). The effects of the TiO2 doping ratio on the catalytic performances were fully investigated. By doping TiO2, the surface acid–base sites of CeO2 nanorods can be obviously promoted and the catalytic activity can be raised evidently. Ti0.04Ce0.96O2 nanorod catalysts exhibited remarkably high activity with a methanol conversion of 5.38% with DMC selectivity of 83.1%. Furthermore, kinetic and mechanistic investigations based on the initial rate method were conducted. Over the Ti0.04Ce0.96O2 nanorod catalyst, the apparent activation energy of the reaction was 46.3 kJ/mol. The reaction rate law was determined to be of positive first-order to the CO2 concentration and the catalyst loading amount. These results were practically identical with the prediction of the Langmuir–Hinshelwood mechanism in which the steps of CO2 adsorption and activation are considered as rate-determining steps.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-10
·
IF 5.705
Wang Yan,Bian Feng,Qin Xiaofei,Wang Qianqian
A visible-light driven photoelectrochemical (PEC) aptasensor is described that is capable of detecting chloramphenicol (CAP). It is based on the use of a TiO 2 based nanorod array (NRA) sensitized with Eu(III)-doped CdS quantum dots. The NRA absorbs visible-light and while strongly depressing the recombination of photogenerated charges, thereby improving photo-to-current conversion efficiency. The introduction of Eu(III) ions promotes the charge transformation and utilization, and this results in a further increase of photocurrent. The NRA was employed as the photoactive material for the fabrication of a PEC aptasensor. CAP-binding aptamers were immobilized on a fluorine-doped tin oxide (FTO) electrode that was modified with the NRA. The aptasensor was applied to the determination of CAP by monitoring the decrease in photocurrent (at a typical voltage of 0 V) that is caused by the formation of the aptamer-CAP complex. Under optimal conditions, the response is linear in the 1.0 pM to 3.0 nM CAP concentration range, with a detection limit of 0.36 pM (at S/ N = 3). The method was applied to the determination of CAP in spiked milk samples where it gave satisfactory results.
Schematic presentation of the fabrication of a visible-light driven photoelectrochemical aptasensor based on the use of a TiO 2 nanorod array sensitized with Eu(III)-doped CdS quantum dots. It was applied to the determination of chloramphenicol with good selectivity and high sensitivity. TiO 2 NRA: TiO 2 nanorod array; FTO: fluorine-doped tin oxide; CdS:Eu 3+ QDs: Eu(III)-doped CdS quantum dots; BSA: bovine serum albumin; CAP: chloramphenicol
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Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 3
·1017-1027
·
IF 8.867
Rutao Wang,Shijie Wang,Yabin Zhang,Dongdong Jin,Xinyong Tao,Li Zhang
Sodium-ion-based capacitors and batteries are considered as a low-cost energy storage technology alternative to their lithium-ion counterparts owing to the abundance of sodium in Earth. Their widespread use is however limited by the lack of high-performance electrode materials. In this work, we report that MXenes-Ti3C2 can be oxidized into a Ti-peroxo complex gel at room temperature by simply adding H2O2, from concentrated to dilute. The highly water-soluble property of this gel allows the synthesis of a graphene-supported TiO2 nanocomposite with highly porous nano-/meso-hybrid architecture via a more facile and environmentally friendly way. The unique hybrid architecture of the produced TiO2–RGO nanocomposite results in pseudocapacitive behavior in Na+ charge storage with high reversibility, fast kinetics, long cyclability, and negligible degradation to the parent structure. By incorporating the TiO2–RGO composite as the anode, a novel sodium-ion capacitor is constructed that is capable of operating at a high voltage of 4.0 V and delivering a maximum energy density of 94.7 W h kg−1, which is comparable to lithium-ion based capacitors. The approach reported here could be potentially extended for fabricating a host of MXenes-derived metal oxide nanomaterials or nanocomposites for numerous applications, particularly in view of the expanding MXenes portfolio.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 32
·2401540
·
IF 18.5
Shurui Cong,Jihai Cai,Xiaoyun Li,Junqin You,Lei Wang,Xiaoying Wang
TiO 2 photocatalysis has gained attention as a cost-effective way of degrading contaminants. However, it relies on UV excitation and experiences rapid carrier recombination. To address these drawbacks, novel xylan-based carbon dots@hydrogenated TiO 2 (CDs@TiO 2-x ) composited by direct Z-scheme heterojunction is fabricated as a visible light-driven photocatalytic material, which broadens the range of light absorption to visible light and suppresses the recombination of photogenerated carriers. The spindle-shaped CDs@TiO 2-x has C/N/O/S groups, positive charges, and oxygen vacancies on its surface, and can degrade 89% of methylene blue and 87% of methyl orange within 90 min, and 99% of rhodamine B within 60 min in visible light. It also eradicates 99.9% of E. coli in 2 h and 97.1% of S. aureus in 2.5 h. These performances surpass CDs and TiO 2-x , and exhibit advantages in similar composite materials. The degradation pathways of dyes and the specific antibacterial processes induced by ROS are thoroughly investigated through LC-MS testing and related enzyme activity assays. DFT calculations study the role of oxygen vacancies, heterojunction mechanism, and catalytic sites. This study has developed a novel nanocomposite with applications in both dye degradation and sterilization, offering insights for multifunctional materials based on photocatalysis and heterojunction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chentao Hou,Hualin Liu,Mingyuan Zhang,Liping Wang
The TiO 2 has the problems of low utilization of visible light and high photogenerated carrier recombination rate. The photocatalytic activity of TiO 2 can be significantly improved by introducing F ion and narrow band gap material Ag 2 S. When F ions are present on the {001} surface of TiO 2 , surface F ions drive positively charged holes across the {001} surface, creating a synergistic effect that promotes the separation of electron-hole pairs. During the sample composite process, a certain amount of Ag will be precipitated to form an all-solid Z-type heterojunction structure of Ag 2 S, Ag and F-TiO 2 , which can improve the electron-hole separation efficiency. The results of XPS characterization confirmed the migration of F ion and the precipitation of Ag. The Ag 2 S/F-TiO 2 composite sample was referred to as AT for short, and the corresponding ratio was 1:10,1:20,1:30,1:40, the optimal sample AT 1:20 degraded 95.6% tetracycline hydrochloride within 2 hours. This work simultaneously realizes TiO 2 self-modification (synergistic effect of F ion migration and TiO 2 {001} crystal surface) and composite modification (formation of all-solid Z-type heterojunction), a new idea of studying TiO 2 self-modified cooperative heterostructures is proposed, and the good application potential of AT nanocomposites in photocatalytic water treatment technology is demonstrated.
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