JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2024
·Vol. 171
·期 6
·063503
·
IF 3.1
Beihu Lu,Muya Cai,Xiang Chen,Huayi Yin
Titanium alloys have been widely used in bone implants, but the mechanical properties, elastic modulus mismatch between bone and metal, and stress shielding effects can occur. However, porous materials can effectively overcome this problem. In recent years, porous structures have attracted enough attention from researchers. Adjustment of the porous structure may make the titanium alloys better able to meet the requirements of the implant. In this study, we have successfully prepared Ti-6Al-4V alloys by combining powder metallurgy with electrolysis in molten salt. At the same time, CaCl2 was used as a sacrificial space holder to adjust the porosity and porous structure. The Ti-6Al-4V alloys prepared by this method contain 29%–60% porosity and elastic modulus has been controlled between 1.8 GPa to 7.8 GPa, which is suitable for cancellous bone, trabecular, and other parts with low elastic modulus. In addition, the higher porosity also showed better corrosion resistance in the Hank's solution. The potentiodynamic polarization curves show that the corrosion resistance increases significantly with an increase in porosity.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tengfei Yu,Rongrong Chen,Xiang Ji,Zhijun Fu,Subing Jiang,Meizhen Gao
In this study, we investigated the phase structure, Curie temperature, dielectric properties, piezoelectricity, and energy-storage properties of BiFeO 3 (BFO)-modified (Ba 0.95 Ca 0.05 ) (Ti 0.89 Sn 0.11 )O 3 (BCTSO) ceramics using both experimental and theoretical methods. The results indicated that the lattice distortion and chaotic distribution of the local charge increased with the BFO content, resulting in a phase transition and transformation from a ferroelectric to a relaxing ferroelectric. First-principles calculations revealed that the Curie temperature decreased with increasing BFO content, primarily because of an increase in the ground state energy. The variation in the permittivity of the BCTSO- x BFO ceramics with temperature and frequency is affected by the phase structure and Maxwell-Wagner interface polarisation, respectively. The electrical modulus measurements indicated that BCTSO- x BFO exhibited non-Debye-type dielectric relaxation for x = 0.0, 0.1, and 0.5 %, whereas BCTSO- x BFO showed Debye-type dielectric relaxation for x = 0.9%.
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NANOTECHNOLOGY
·
2016
·Vol. 28
·期 5
·055403
·
IF 3.573
Aibin Huang,Jingting Zhu,Jianyun Zheng,Yu Yu,Yan Liu,Songwang Yang,Shanhu Bao,Lei Lei,Ping Jin
An anodized TiO2 interconnected network was fabricated and utilized as a mesoporous scaffold and electron transporter in perovskite solar cells. By modifying the synthesis parameters, the morphological features of the interconnected TiO2 nanostructures can be widely tuned and precisely controlled. The functional properties of the anodized TiO2 network are found to be severely influenced by morphology as well as the extent of oxidation. The device with the optimized TiO2 network exhibits superior electron extraction and transferability, resulting in conspicuous enhancement of the photocurrent and power conversion efficiency (PCE). This work proposes a promising and facile method for improving the performance of perovskite solar cells.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-9
·
IF 2.8
Song Peiqi,Zhu Zhe,Yao Zhonghua,Hao Hua,Cao Minghe,Liu Hanxing
Piezoelectric materials are widely used in the direction of sensors. PZT-based ceramics are very suitable for precision sensors. However, due to the low Curie temperature, the application temperature range of the material is relatively narrow. Here we show a high-performance material 0.6PZT–0.4PNN. In this case, a morphotropic phase boundary (MPB) region was artificially designed in the 0.6Pb(Zr x Ti 1 −x )O 3 –0.4Pb(Ni 1/3 Nb 2/3 )O 3 ( x = 0.35–0.41) ceramics to develop high-performance piezoelectric compositions which could cofire with low-cost Ag/Pd inner electrode by 0.2wt% Li 2 CO 3 addition. The ceramic composition at x = 0.39 near MPB possess exceptional properties with high piezoelectric coefficient d 33 ∼ 611 pC/N, planar electromechanical coupling coefficient k p ∼ 53.5%, low mechanical quality factor Q m ∼ 64.5 piezoelectric strain of 0.17%, and suitable Curie temperature T c ∼ 191 °C, respectively. The fact that d 33 was detected close to T c , and no noticeable change below 6.6% in cycling stability was observed at 20 kV/cm means a robust temperature-independence and fatigue reliability of the piezoelectric ceramics. Thus, this research provides a novel high-piezoelectricity configuration with elemental regulation, comparable to the commercial PZTs.
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Catalysts
·
2019
·Vol. 9
·期 2
·108
·
IF 3.444
Jian Shi,Feng Hui,Jun Yuan,Qinwei Yu,Suning Mei,Qian Zhang,Jialin Li,Weiqiang Wang,Jianming Yang,Jian Lu
Several Ru-Ti oxide-based catalysts were investigated for the catalytic oxidation of HCl to Cl2in this work. The active component RuO2was loaded on different titanium-containing supports by a facile wetness impregnation method. The Ru-Ti oxide based catalysts were characterized by XRD, N2sorption, SEM, TEM, H2-TPR, XPS, and Raman, which is correlated with the catalytic tests. Rutile TiO2was confirmed as the optimal support even though it has a low specific surface area. In addition to the interfacial epitaxial lattice matching and epitaxy, the extraordinary performance of Ru-Ti rutile oxide could also be attributed to the favorable oxygen species on Ru sites and specific active phase-support interactions. On the other hand, the influence of additive Ce on the RuO2/TiO2-rutile was studied. The incorporation of Ce by varied methods resulted in further oxidation of RuO2into RuO2δ+and a modification of the support structure. The amount of favorable oxygen species on the surface was decreased. As a result, the Deacon activity was lowered. It was demonstrated that the surface oxygen species and specific interactions of the Ru-Ti rutile oxide were critical to HCl oxidation.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Yuan Chen,Yelin Li,Wanjun Tang,Tingcheng Li,Qingliang You,Guangyong Xie
In the field of heterogeneous catalysis, it still remains a challenge in controlled preparation of micro-nanostructured composite oxide catalysts. In this regard, a series of urchin-like V–Ti–O micro-nanostructures with varying Ti/V molar ratios are successfully synthesized by the reaction between tetrabutyl titanate (TBOT) and vanadyl oxalate via a facile one-step solvothermal process and subsequent calcination. The influences of reaction conditions, such as the ratio of reactant, the acidity of reaction system, and the use of glycol on the morphologies and oxidation state of vanadium are investigated. The results show that urchin-like hierarchical micro-nanostructures are formed, on which a large number of one-dimensional nanobelts radially grow from the center. Vanadium oxide species are highly dispersed on the external surface of the anatase TiO 2 structure. The obtained V–Ti–O catalysts are tested for the ammoxidation of mono- and dichlorotoluenes in gas-phase with molecular oxygen and exhibit high catalytic activity in converting chlorotoluenes to corresponding nitriles.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Jiacheng Xiao,Yuqing Liu,Jiarui Wang,Zexin Mo,Chenyu Liu,Zhan Lin,Dong Luo
Lithium-rich manganese-based cathode materials, represented as xLi 2 MnO 3 ·(1-x)LiMO 2 (M = Ni, Co, or Mn), exhibit high specific capacity and low cost, making them promising candidates for next-generation high-energy-density lithium-ion battery cathodes. However, the low covalency of the Li–O–Li configuration renders these cathode materials highly susceptible to irreversible oxygen release and structural evolution, leading to severe voltage and capacity degradation, which hinders their practical application. To address this issue, this study employs a Ba/Ti co-doping strategy to modulate the oxygen electron and reinforce the structure of lithium-rich manganese-based cathode materials. Post-cycling results indicate that Ti/Ba co-doping effectively suppresses electrolyte corrosion and surface/interface reactions, improves the reversibility of O-redox during cycling, and enhances the structural stability of both the bulk and surface of the materials. As a result, the Ba/Ti co-doped sample exhibits an excellent capacity retention of 95.2 % after 300 cycles.
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CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Hongyu Wang,Fumin Wang,Kaiwei Wang,Xubin Zhang,Changhao Bing,Xiaolu Fan,Tongxue Zhang,Syed Mujtaba ul Hassan
Developing an approach for the efficient synthesis of TS-1 zeolites with desirable morphologies and tunable coordination environments for Ti active sites is a pivotal challenge in the design of high-performance catalysts and zeolite crystal engineering. Herein, we report a cost-effective and efficient additive, guanidinoacetic acid (GAA), and conduct a systematic study on the synthesis of plate-like TS-1 zeolites using GAA as an additive. Introducing GAA during hydrothermal synthesis not only modulates the morphology of TS-1 crystals but also permits GAA to adequately chemically interact with titanium precursors to form hexa-coordinated Ti species. TS-1 zeolites with a controllable b-axis thickness in the range of 80–110 nm, and abundant framework Ti and hexa-coordinated Ti species are successfully achieved by optimizing the synthetic parameters. Through SEM, FT-IR, XPS, TEM, and XRD analysis, the mechanism of GAA altering crystal growth is mainly to inhibit the growth of the (010) plane. A b-axis-oriented TS-1 zeolite enriched with hexa-coordinated Ti species displays better catalytic performance in the 1-hexene epoxidation reaction than the conventional TS-1 zeolite containing only framework Ti species (35 vs 24%). This can be ascribed to the more active hexa-coordinated Ti species and shorter diffusion distance. This synthetic strategy provides a way to change the zeolite morphology and tune the number and distribution of Ti species in TS-1 zeolites.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Min Zhang,Shuhuan Yin,Jia Wen,Bin Zheng,Shaohua Lin,Haixia Wu
With the increasing severity of microplastic (MPs) pollution in aquatic environments, the process of removing MPs from water environments by electrocoagulation (EC) technology has attracted widespread attention. In this study, EC using a dimensionally stable anode (DSA)-coated Ti electrode (RuO₂-IrO₂/Ti) under pulsed current was employed to treat wastewater containing polystyrene (PS) MPs. The effects of factors such as electrolyte concentration, initial solution pH, current density, pulse frequency, and pulse duty cycle on the PS removal efficiency were investigated. The results showed that the maximum PS removal of 94.2 % was achieved with an energy consumption of 5.5 kWh/g. The removal mechanism of PS was elucidated through analyses including scanning electron microscopy-energy dispersive spectroscopy, X-ray photoelectron spectroscopy of electrode, X-ray diffraction, fourier transform infrared, and zeta potential measurement of the flocs. Finally, the article conducts an economic analysis of this technology and provides an outlook on its application prospects. This study confirms that the EC technology using RuO₂-IrO₂/Ti can remove MPs from wastewater effectively, which may provide new insights for the development of MPs removal technologies.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Pengfei Wang,Yanyan Li,Bo Fan,Bin Yang,Liangdong Lin,Chen Bao,Qinghai Ma,Gaofeng Li,Dianbo Ruan
A series of Ti-doped Na 3 V 2 (PO 4 ) 2 O 2 F materials were synthesized through a controlled coprecipitation method with precise Ti content regulation. Experimental results indicate that a 15 wt% Ti doping level (NVTOPF-0.15) optimally enhances electrochemical performance, yielding an initial discharge capacity of 119.3 mAh g −1 at 0.2C and retaining 84.3 % of its capacity after 2000 cycles at 5C. Titanium doping exerted a dual-functional effect: streamlining the synthesis pathway through synergistic coprecipitation with controllable particle size and enhancing the lattice substitution of Ti 4+ for V in VO 6 octahedra. This substitution refined the crystal structure and enhanced Na + diffusion kinetics. Titanium doping-induced structural reconstruction led to a reduction in particle size, thereby facilitating the electrochemical reaction kinetics. Additionally, using a combination of the Randles-Sevcik equation and theoretical calculations, it was found that titanium doping significantly increased the Na + diffusion coefficient and decreased the band gap. This study presents a dual-functional titanium-doping approach for high-rate and long-life sodium-ion cathode materials. The synthesis of NVTOPF via the co-precipitation method will provide new guidance for the development and application of positive electrode materials in sodium-ion batteries.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 6
·118066
·
IF 6.2
Rui-Hua Chen,Suniya Siddique,Hua-Jing Zhang,Ning Chen,Zhuo-Ming Xu,Zi-Long Zhang,Yue-Xing Chen,Zhuang-Hao Zheng,Fu Li
Herein, a Ti/Cu co-doping strategy is employed in Bi 2 SeS 2 to optimize its electrical and thermal transport properties through carrier regulation and microstructure modulation. The Ti/Cu co-doped Bi 2 SeS 2 samples were synthesized by mechanical alloying followed by spark plasma sintering. It is found that the co-doping boosts electrical conductivity while preserving a moderate Seebeck coefficient of 150–200 μV K −1 . This yields a high power factor of 5.5 μW cm −1 K −2 at 773 K. Moreover, the lattice thermal conductivity is reduced to ∼0.25 W m −1 K −1 , primarily due to effective phonon scattering induced by lattice strain and point defects. Finally, a peak zT of ∼0.80 is achieved at 773 K in Bi 1.96 Ti 0.04 SeS 2 -1 %Cu, surpassing the solely Cu-doped and Ti-doped counterparts by ∼22 % and 40 %, respectively. These findings reveal that multi-element doping is an effective approach for tailoring both charge and phonon transport, providing valuable insights for the design of advanced thermoelectric materials.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2019
·Vol. 50
·期 2
·940-949
·
IF 1.952
Ma Xue,Xie Hongwei,Qu Jiakang,Song Qiushi,Ning Zhiqiang,Zhao Haijia,Yin Huayi
Molten salts can provide a high-temperature and oxygen-water-free environment, and the electrochemical polarization is able to reduce the oxide scale on the surface of Ti and Ni particles in molten salts and, thereby, enhance the sintering and accelerating atom diffusion between Ti and Ni. Thus, an electro-assisted powder metallurgical (EPM) approach was developed to prepare porous Ti and NiTi from metal powders in molten salts, where the porous pellet cathode made of the mixture of Ni and Ti powders is electrochemically polarized to facilitate the generation of the porous Ti and NiTi at a temperature lower than 1000 °C. The electrolytic product obtained under a cell voltage of 3 V for 12 hours is nearly pure NiTi with a tiny amount of undesired Ni 3 Ti and NiTi 2 phases. Overall, the EPM route could be a straightforward and general way to prepare porous Ti and Ti-alloys for implants and other applications.
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