COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2011
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IF 2.13
Fang Deng,Yuexiang Li,Xubiao Luo,Lixia Yang,Xinman Tu
Conductive polypyrrole/TiO 2 nanocomposites were successfully prepared by surface molecular imprinting technique (MIP-PPy/TiO 2 ) using methyl orange as template molecule. The samples were characterized by means of SEM, XRD, BET and UV–vis diffuse reflectance spectroscopy. Compared with conductive polypyrrole/TiO 2 nanocomposites which were prepared by in situ method (Control-PPy/TiO 2 ), the absorption edge of MIP-PPy/TiO 2 red-shifts 10 nm, indicating that the band gap energy of MIP-PPy/TiO 2 is narrower than Control-PPy/TiO 2 . Moreover, MIP-PPy/TiO 2 nanocomposites show higher adsorption capacity and selectivity for template molecule than Control-PPy/TiO 2 nanocomposites, and the photocatalytic activity of MIP-PPy/TiO 2 is two times of Control-PPy/TiO 2 , which is attributed to the introduction of the imprinted cavities on the surface of MIP-PPy/TiO 2 nanocomposites. Therefore, surface molecular imprinting method may be considered as a novel technology for the preparation of PPy/TiO 2 .
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
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IF 4.1
Libo Yu,Zhen Li,Weiqiang Qiao,Junke Wang,Chengshuang Zhao
Light harvesting plays crucial role for high photovoltaic performance of quantum dots sensitized solar cell (QDSSC). However, there are still issues need to be tackled, such as enlarging light response range and enhancing light scattering capability. In this work, TiO 2 eggshell hollow microspheres (EHMS) were synthesized by carbonaceous microspheres (CMS) template method and co-sensitized by CdS/CdSe/PbS quantum dots (QDs) for application in QDSSC . Compared with QDSSC based on TiO 2 nanoparticles (NP) and TiO 2 hollow microspheres (HMS), the TiO 2 EHMS based QDSSC showed a remarkable increase of short-circuit current density (J sc ) to 24.81 mA cm −2 with a power conversion efficiency (PCE) of 4.07 %. Photoelectrochemical analysis of QDSSC indicate that CdS/CdSe/PbS QDs can enlarge the light response range, and the TiO 2 EHMS improve the light scattering, leading to the improvement of light harvesting efficiency. Charges dynamics tests results proved that a larger charges recombination resistance at photoanode/electrolyte interface and longer electron lifetime can be achieved with TiO 2 EHMS, contributing to the boost of J sc . The presented study introduces a simple strategy for researchers interested in designing photoanode for various photoelectrochemical applications.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xiaolei Bao,Minghui Zhang,Zeyan Wang,Dujuan Dai,Peng Wang,Hefeng Cheng,Yuanyuan Liu,Zhaoke Zheng,Ying Dai,Baibiao Huang
Design and preparation of efficient photocatalyst for CO 2 reduction into fuels remains a serious challenge. Herein, the copper nanoclusters (Cu NCs) modified TiO 2 with oxygen vacancies (OVs) samples (COCT) were obtained by a convenient molten-salt method. The liquid environment of isolate oxygen and the space confinement effect of molten-salt will lead to the generation of highly dispersed Cu NCs and stable OVs. This enables COCT to exhibit excellent photocatalytic CO 2 reduction to CO performance with the highest CO generation rate reaching 40.3 μmol h −1 g −1 , which is more competitive than most reported TiO 2 -based photocatalysts. The superior activity is ascribed to the synergistic optimization of the thermodynamics and kinetics of photocatalytic CO 2 reduction to CO by Cu NCs and OVs, insuring the reaction pathway with a lower energy barrier. Our work may provide an easy and low-cost strategy for fabricating the highly dispersed cocatalyst together with surface defect to enhance artificial photosynthesis.
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Surfaces and Interfaces
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2024
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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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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yuvarajgouda N. Patil,Manjunath B. Megalamani,D.A. Ayush Gowda,Sharanappa T. Nandibewoor,Shivashankar Hiremath
This study focuses on developing a rapid, easy-to-use, and sensitive sensor for the electroanalytical detection of Metaxalone (MXL) for the first time. A novel sensor was created by combining sulfur-incorporated graphitic carbon nitride (S-GCN) with tungsten-doped titanium oxide nanoparticles (W: TiO 2 NPs) in a carbon paste, which was then loaded into a polytetrafluoroethylene (PTFE) tube. The synthesized modifiers were characterized using SEM, XRD, and FTIR techniques to understand their structural, morphological, and functional features, contributing to the electrocatalytic activity of the modified sensor (W: TiO 2 /S-GCN@CPE). Comparative analysis showed that W: TiO 2 /S-GCN@CPE achieved higher detection currents than the unmodified carbon paste electrode (CPE). Cyclic voltammetry (CV) and square wave voltammetry (SWV) were used to detect and quantify MXL electrochemically. The electrode’s physicochemical properties were studied under optimal conditions within a potential range of 0.3 V to 1.5 V. The W: TiO 2 /S-GCN@CPE showed a detection limit of 0.85 x 10 -8 M and demonstrated linearity over a concentration range of 0.1–100 x 10 -7 M. The sensor’s selectivity against interference from metal ions was also assessed. In practical applications, the developed electrode effectively detected MXL in spiked water, tablets, and biological samples, showing significant detection capacity and good recovery rates. Additionally, the electrode demonstrated stability across multiple measurements, positioning W: TiO 2 /S-GCN@CPE as a promising sensor for MXL detection.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jiejie Bai,Yue Shi,Aixin Ma,Feifei Liu,Yanru Liu,Caixia Li,Jianping Lai,Lei Wang
The production of three separated, high-value chemicals (H 2 O 2 , urea and H 2 ) from CO 2 , N 2 , and H 2 O represents a significant challenge. It is a prospective and innovative way to simultaneously produce these chemicals in an anion exchange membrane (AEM) electrolyzer, which couples anodic 2e - water oxidation (2e - WOR) and cathodic CO 2 , N 2 and water reduction reaction (CNWRR), but has not yet been realized. Here, we found that bifunctional Cu x Ti 1-x O 2-y catalysts can be employed in the electrochemical production of H 2 O 2 , urea and H 2 from CO 2 , N 2 and water, and the optimized Cu 0.12 Ti 0.88 O 2-y catalyst exhibits an excellent productivity of 11.8 μmol cm −2 min −1 , 0.3 mg cm -2 h −1 and 0.82 mmol cm -2 h −1 for H 2 O 2 , urea and H 2 at 4.0 V (50 mA cm −2 ) in AEM electrolyzer, respectively. Theoretical calculations reveal that the superior performance of the 2e - WOR and CNWRR is attributed to the Cu doping effect, which not only promotes the coupling of *OH but also optimizes the adsorption energy barriers of COOH* and NNH*. It is worth noting that the AEM electrolyzer assembled by bifunctional Cu 0.12 Ti 0.88 O 2-y reaches a current density of 50 mA cm −2 with a cell voltage of 4.0 V and exhibits excellent stability of 50-hour continuous operation.
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Advanced Healthcare Materials
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2025
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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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APPLIED CATALYSIS B-ENVIRONMENTAL
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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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CERAMICS INTERNATIONAL
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2024
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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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ACS Applied Energy Materials
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2024
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IF 5.4
Huan Liu,Ziyue Wang,Yicheng Peng,Jiyang Xie,Wanbiao Hu
Introducing high dielectric-constant inorganic fillers into a high-broaden-strength polymer matrix is a crucial strategy to achieve a high-performance energy storage polymer composite. However, the interfacial coupling between the inorganic fillers and polymer matrix has always been a predicament for optimal performance. Herein, a multilayer interface structure, i.e., TiO2/SiO2, SiO2/polydopamine (PDA), and PDA/PVDF, are developed to resist the applied high electric field and improve the interfacial polarization simultaneously. TiO2 nanorods (NRs) with [001]-oriented rutile polymorph are synthesized by sodium dodecyl sulfate (SDS) assisted hydrothermal reaction, which is further decorated with a SiO2 layer and a subsequent PDA layer in order to incorporate well into the PVDF matrix using a solution casting process, finally forming the TiO2@SiO2@PDA/PVDF composite film. The optimal composite film incorporating [001]-TiO2 NRs exhibits an ultrahigh energy density (Ue) of 29.8 J/cm3 at a high Eb of 532 MV/m, sharply superior to the TiO2 counterpart-based films (e.g., TiO2 nanoparticle (NPs) based, and with or without the SiO2/PDA layer, which only gives a maximum Ue of 16 J/cm3 in TiO2@SiO2@PDA NPs/PVDF), and also the similarly inorganic-polymer systems previously reported. This work not only demonstrates an inorganic-polymer hybrid composite film with high electrostatic storage density but also highlights a multilayer interface structure route to alter interfacial microstructures and achieve superior energy storage performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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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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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-12
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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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危险品化学品经营许可证（带存储）