CERAMICS INTERNATIONAL
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2024
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IF 5.1
Zhangyan Zhou,Wenshuo Ma,Mengjin Hong,Beiyue Ma,Chuanbo Hu
The application of superhydrophobic coatings on carbon steel (CS) surface represents an effective strategy for mitigating corrosion in these materials. This study presents the preparation of superhydrophobic Ni/Mn-TiO 2 composite (SNMT) coatings on CS substrates through a facile one-step electrodeposition technique. The formation mechanism of SNMT coatings was meticulously analyzed under varying conditions of nanoparticle types and concentration levels. The inclusion of TiO 2 nanoparticles, with an optimal additive concentration of 1 g, facilitated the formation of numerous low surface energy, cauliflower-like microstructures on CS interface. Surprisingly, the results indicate that SNMT coatings maintained commendable superhydrophobicity even post-exposure to superficial damages such as tape peeling, sandpaper wear, and knife-scratch, as evidenced by a static contact angle (CA) exceeding 158° and a sliding angle (SA) below 2°. Furthermore, the corrosion inhibition efficacy of SNMT coatings was quantitatively assessed via dynamic potential polarization curves in a simulated seawater environment. The results demonstrated that SNMT coatings exhibited excellent corrosion inhibition performance in simulated seawater solution, with a protection efficiency (PE) reaching 96.5 %. In conclusion, superhydrophobic surfaces can effectively inhibit the penetration of corrosive liquids. The durability and robustness of such superhydrophobic surfaces advocate for their potential widespread application in enhancing the longevity and reliability of CS in corrosive environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Fei Wang,Jingxia Gao,Delin Yang,Haoming Li,Jinping Zhang,Jie Liu,Yong Liu,Fengzhang Ren
The uneven lithium deposition on Cu current collector and poor interface stability of lithium metal/electrolyte would lead to rapid capacity decay and potential safety risks, which severely hinder the practical applications of lithium metal batteries. In this work, the in-situ derived Ti 3 C 2 T x MXene/TiO 2 (labeled as MXene/TiO 2 ) composite with favorable lithiophilicity and conductivity is applied as modified layer on Cu foil current collector (labeled as MXene/TiO 2 @Cu) to obtain the uniform and dense lithium plating. Compared with bare Cu and commercial TiO 2 nanoparticles modified Cu current collector (labeled as Nano TiO 2 @Cu), the MXene/TiO 2 @Cu combines abundant lithium nucleation sites and improved conductivity, which could promote uniform lithium plating and stripping at high current density and effectively avoid the generation of dead lithium or lithium dendrites. As a result, the MXene/TiO 2 @Cu-based symmetric battery could stably cycle for 2000 h at high current density of 3 mA cm −2 with capacity of 3 mAh cm −2 , and the MXene/TiO 2 @Cu-Li‖LiFePO 4 full battery could maintain the high reversible capacity of 104.0 mAh g −1 at 1 C after 500 cycles. This work provides an effective and novel protection strategy for Cu current collector, which is critical for the design of lithium metal batteries with favorite rate capability at high current density.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Guanzheng Wang,Wenjiang He,Zhentao Yuan,Lu Li,Xiao Wang,Wenshen Tang,Zhaolin Zhan
The slow diffusion rate of lithium ions limits commercial TiO 2 from being used at scale in LiBs. This paper presents the strategy used to synthesize a homojunction anatase/rutile-TiO 2 core-shell microsphere enriched with oxygen vacancies. Oxygen vacancies and interfacial shared storage accelerate electron mobility and improve lithium-ion diffusion kinetics. Electrochemical AC impedance measurements show that the Li + diffusion coefficient of A/R-TiO 2 -V o 2 samples with oxygen vacancies is (1.14 × 10 -12 cm 2 /s), which is higher than the diffusion coefficient of A/R-TiO 2 samples without oxygen vacancies (9.28 × 10 -14 cm 2 /s). The study of the effect of oxygen vacancy content on crystal structure and lithium-ion storage capabilities was quantitatively modulated. The specific capacity of an A/R-TiO 2 -V o 2 anode containing a moderate number of oxygen vacancies was 405 mAh/g after 450 cycles at 0.5 C, which is 121% of the theoretical maximum. This high-capacity behavior can be mainly attributed to the synergistic effect of core-shell hollow structures, interfacial shared storage, and oxygen vacancies generating additional active sites located at grain boundaries that are available for lithium storage. This strategy of oxygen defect engineering combined with heterojunctions can be extended to other materials with similar dilemmas.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Aobo Wan,Longkai Zhu,Yizhen Zhang,Shijing Huang,Yun He,Shunxi Zhang,Fengjiao Quan,Jianfen Li
The poor contact between the photocatalyst and the FTO substrate are the main factors lead to the low performance of photocatalytic fuel cell (PFC). Herein, a FTO pre-treated with a TiO 2 electron transport layer was used as a substrate for the synthesis of the MoS 2 /BiVO 4 /pre-FTO photoanode. The proposed MBV-4/pre-FTO photoanode with its enhances the visible light absorption and effectively delays the recombination of the photoexcited charge. The MBV-4/pre-FTO composite photoanode (6.02 mA/cm 2 ) exhibited a photocurrent density that was 2.2 times higher than that of the BiVO 4 photoanode (2.78 mA/cm 2 ). This is attributed to the short charge migration length of the thin MoS 2 layer, the fast photoexcited electron transport effect of the TiO 2 seed layer, and the heterojunction structure of the proposed photoanode. The DFT calculation result indicated that the TiO 2 electron transport layer showed an outstanding photoelectron attractive and transporting effect. The MoS 2 /Ni foam was employed as the photocathode to establish a mismatched Fermi level for driving PFC. The short-circuit current, open-circuit voltage, and maximum power density of the PFC were 0.578 mA/cm 2 , 0.632 V, and 0.125 mW/cm 2 , respectively. The main photodegradation active species are the superoxide anion (∙O 2– ) and the photoexcited hole (h + ), and the degradation efficiency is 61.97 %.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2024
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IF 6.3
Wufei Tang,Huimin Zhang,Ting Liu,Xinle Li,Hua Yang,Weizhen Huang,Yunhui Liao,Xiaoyu Gu,Sheng Zhang
Ethylene vinyl acetate copolymer (EVA) is widely applied in many important fields, but its broader utility is impeded by its flammability . To address this problem, the pre-acidified kaolinite (AKaol) by sulfuric acid was further dealt with TiO 2 loading and Zn 2+ doping to obtain Zn/TiO 2 @AKaol to improve the flame retardancy and smoke suppression of EVA composites containing intumescent flame retardants (IFR) typically. The results showed that the addition of 1 wt% Zn/TiO 2 @AKaol improved the flame retardancy and reduced the smoke release of EVA/IFR composite. The limiting oxygen index (LOI) value of the EVA/IFR composite containing Zn/TiO 2 @AKaol increased to 32.7 % from 27.3 % of EVA/IFR composite. In the cone calorimeter test (CCT), the peak heat release rate (pHRR) and total heat release (THR) values were reduced to 297.5 kW/m 2 and 98.8 MJ/m 2 from the 409.9 kW/m 2 and 109.3 MJ/m 2 of EVA/IFR composite, respectively. Meanwhile, the values of total smoke production (TSP) in the CCT and smoke density tests in building materials were reduced to 13.5 m 2 and 33.39 % of EVA/IFR/Zn/TiO 2 @AKaol composite from 18.4 m 2 and 63.91 % of EVA/IFR composite, respectively. Based on the mechanism analysis, it was proposed that Zn/TiO 2 @AKaol not only promoted the production of P· in advance, but also increased a cross-linked structure char in the condensed phase to achieve flame retardancy and smoke suppression of EVA composites.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Raril Chenthattil,Sijian Luo,Hang Ao,Wencheng Xiao,Huangxian Ju
This work proposed an electrochemical biosensing method for simultaneous detection of guanine and adenine. This electrochemical biosensor was constructed by layer-by-layer assembling TiO 2 nanoparticles, poly( l -lysine) and graphene quantum dots (GQDs) on a glassy carbon electrode. The assembled film of TiO 2 /poly( l -lysine)/GQDs showed better conductivity and significantly increased effective surface area for the electrochemical oxidation of guanine and adenine along with a quasi-reversible electrode process. Under optimal preparation and square wave voltammetric detection conditions, the proposed electrochemical methods could simultaneously detect guanine and adenine ranging from 1.0 to 35.0 µM with detection limits of 0.56 µM for GA and 0.81 µM for AD. The limits of quantification for sample analysis were 1.90 and 2.70 µM, respectively. The developed electrochemical biosensor exhibited good reproducibility, anti-interfering properties, and stability, and could be practically applied in the simultaneous determination of guanine and adenine in calf thymus DNA, cow milk, and urine samples with acceptable precision.
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高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Hongli Fang,Yuanqing Kang,Shaotang Yuan,Miaomiao Zhang,Zebao Rui
Titanium dioxide (TiO 2 ) is a widely used low-cost and stable photocatalyst, but its wide bandgap and low quantum efficiency usually lead to poor photocatalytic performance. Herein, one-step solid state calcination and reduction method was proposed for simultaneously introducing surface defects and loading Ag nanoparticles (NP) on TiO 2 . The as-obtained black TiO 2-x supported Ag NP (or Ag/TiO 2-x ) holds a narrow bandgap to respond to the full solar spectrum due to the presence of high concentration surface vacancies, enhanced light absorption through the surface plasmon resonance effect of Ag NP, and satisfactory photothermal effects. Moreover, such a one-step solid state synthesis method leads to closely linked interface and enhanced charges transfer between Ag NP and TiO 2-x . Accordingly, Ag/TiO 2-x exhibits robust photothermal synergistic VOCs degradation performance with a toluene degradation rate 6 times higher than the reference Ag/TiO 2 (DP) prepared by the conventional solution method.
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Nanomaterials
·
2024
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IF 4.4
Fangqin Liu,Mingjie Fan,Xia Liu,Jinyang Chen
A cellulose-based carbon aerogel (CTN) loaded with titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) was prepared using sol–gel, freeze-drying, and high-temperature carbonization methods. The formation of the sol–gel was carried out through a one-pot method using refining papermaking pulp, tetrabutyl titanate, and urea as raw materials and hectorite as a cross-linking and reinforcing agent. Due to the cross-linking ability of hectorite, the carbonized aerogel maintained a porous structure and had a large specific surface area with low density (0.0209 g/cm 3 ). The analysis of XRD, XPS, and Raman spectra revealed that the titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) were uniformly distributed in the CTN, while TEM and SEM observations demonstrated the uniformly distributed three-dimensional porous structure of CTN. The photocatalytic activity of the CTN was determined according to its ability to degrade rhodamine B. The removal rate reached 89% under visible light after 120 min. In addition, the CTN was still stable after five reuse cycles. The proposed catalyst exhibits excellent photocatalytic performance under visible light conditions.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Shuai Chen,Jia Guo,Hu Zang,Changjiang Liu,Nan Yu,Baoyou Geng
The advancement of polymer solid electrolytes is essential for the development of solid-state lithium-ion batteries (LIBs). Polyvinylidene fluoride (PVDF), recognized for its unique piezoelectric properties and hydrophobicity, emerges as a promising candidate for polymer solid-state electrolyte applications. Nevertheless, its practical usage is hindered by low ionic conductivity at room temperature. To overcome this limitation, we engineered a novel PVDF/LiTFSI/TiO 2 -ov (PLTO) electrolyte by incorporating oxygen-rich vacancy titanium dioxide with PVDF, resulting in significant enhancements in both ionic conductivity and mechanical performance—crucial factors for the long-term stability of batteries. D33 measurements and Fourier transform infrared spectroscopy analyses revealed an increase in the β-phase (TTTT conformation) content of the doped PVDF, which substantially contributes to the improved piezoelectric performance. Furthermore, density functional theory (DFT) analysis indicated that oxygen vacancies facilitate the decomposition of lithium salts and enhance anion adsorption, thereby boosting ion transport efficiency. When integrated into a Li/PLTO/LiFePO 4 semi-solid-state battery, this electrolyte membrane achieved an impressive specific capacity of 154.22 mAh/g at room temperature and 0.5 C, maintaining 95.31 % capacity over 850 cycles, demonstrating exceptional durability. Additionally, lithium/lithium symmetric batteries constructed with PLTO exhibited long-term stability exceeding 3800 hours. The stability of this battery in practical applications, such as LED lighting and subtitle control, underscores its practicality and potential contribution to energy sustainability. This study offers new perspectives for the development of high-performance electrolyte membranes.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2017
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IF 6.065
Shunxing Li,Jiabai Cai,Xueqing Wu,Biwen Liu,Qiaoying Chen,Yuehai Li,Fengying Zheng
An solar-light-driven and bifunctional photocatalyst was designed for photo-reduction of Cr(VI) and selective photo-oxidation of benzyl alcohol into benzaldehyde in the presence of water under ambient conditions. Double-shelled and sandwiched TiO 2 @Pt@CeO 2 hollow spheres were prepared by using functionalized polystyrene spheres, sol-gel, hydrothermal reaction, and calcination. The Pt nanoparticles (NPs) were controllably loaded between the TiO 2 shell and CeO 2 shell. Under solar-light irradiation, the photo-reduction rate of Cr(VI) (μmol h −1 ) was in the order of TiO 2 @Pt@CeO 2 (1.901) > TiO 2 @CeO 2 (1.424) > TiO 2 (1.040) > CeO 2 (0.992). Among the above-mentioned photocatalysts, the conversion rate of benzyl alcohol for TiO 2 @Pt@CeO 2 was also the best. These results were attributed to the combination of TiO 2 and CeO 2 as photocatalyst and oxygen buffer, the double-shelled and sandwiched nanostructure, and the addition of Pt NPs as cocatalyst and electron trap site, which could store and shuttle photo-generated electrons, reduce the recombination of the electron-hole, and then enhance photo-generation of active radicals. This conclusion was verified by the electron paramagnetic resonance (EPR) spectroscopy. Considering the versatile combination of photocatalyst, oxygen buffer and cocatalyst, this work could provide new insights into the design of high-performance bifunctional photocatalysts for heavy metal removal and selective synthesis.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Yang Yu,Yu Zhao,Tian-Dong Zhang,Rui-Xuan Song,Yu-Lei Zhang,Yu-Long Qiao,Wei-Li Li,Wei-Dong Fei
Colossal dielectric properties in donor-acceptor co-doped rutile TiO 2 ceramics have attracted increased interest in recent years. However, dielectric loss (tan δ) of (Nb+Al) co-doped TiO 2 ceramics are quite scattered in the previous studies. Here, we show the dielectric properties of (Nb+Al) co-doped rutile TiO 2 ceramics are sensitive to sintering and ageing technologies, which is related to the coupling behavior of acceptor-donor ions. Both permittivity and dielectric loss of as-sintered (Nb+Al) co-doped TiO 2 ceramics are very large, and increase with the sintering time increasing. After ageing treatment at 900 °C, the dielectric loss of co-doped ceramics reduces from 139 to 0.15 in a wide frequency range. Based on the X-ray diffraction and complex impedance analyses, it can conclude that Nb 5+ -Al 3+ pair formation during ageing treatment reduces the concentration of oxygen vacancy , resulting in the decreases of the conductivity and dielectric loss. The changes in dielectric response of (Nb+Al) co-doped TiO 2 ceramics clearly suggest that ageing process is an effective way for the Nb 5+ and Al 3+ ions to form the Nb 5+ -Al 3+ pairs. We believe that the coupling effect of donor-acceptor ions is a practical and feasible route to reduce the dielectric loss of (Nb+Al) co-doped TiO 2 ceramics for high-energy-density storage applications.
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Materials Science & Engineering C-Materials for Biological Applications
·
2018
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IF 5.08
Yada Li,Weiqiang Wang,Huiying Liu,Jingwu Lei,Jingying Zhang,Hongzhi Zhou,Min Qi
A novel “cortex-like” micro/nano dual-scale structured TiO 2 coating was prepared on a titanium surface by micro-arc oxidation (MAO) with tetraborate electrolytes. This structure, which combines microslots with nanopores, exhibits super hydrophilicity. This coating modified the surface structure, chemistry, and hydrophilicity in a one-step treatment. Evolution of the coating together with its surface and structure properties was studied. We propose a forming mechanism of the dual-scale structure in which the oxides formed during the MAO discharge dissolve in the tetraborate electrolytes, leaving little or no deposition outside the discharge channels. We performed in vitro tests using human bone marrow-derived mesenchymal stem cells (hBMSCs) that compared this coating with a “volcano-like” MAO coating and a commercial sandblasted, large-grit and acid-etched (SLA) coating. The adhesion, morphology, proliferation, and differentiation of hBMSCs, together with the matrix mineralization, were investigated. Results suggest that the “cortex-like” structure significantly promotes the adhesion, spreading, and differentiation of cells and increases the matrix mineralization. In vivo tests with mongrel dogs showed an excellent osseointegration of the “cortex-like” coating. The combination of the dual-scale structure and the hydrophilicity of the “cortex-like” TiO 2 coating synergistically resulted in an outstanding cytocompatibility and osseointegration, which may facilitate a higher level of implant success.
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