MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Daoyong Lin,Zhifu Liu,Da Li,Jinjun Zhao,Yue Liu,Lei Cao,Guanxiang Ma,Wei Zhao
The Li 2 CO 3 -ammonia-ballmilling synthesis system of Li 4 Ti 5 O 12 (LTO) was optimized and doped Li and O by theirs adjacent elements Mg and F respectively. By adjusting the ballmilling parameter , the distribution of Li and Ti sources, the hydrolysis rate and different nucleophilic / electrophilic hydrolysis path of Ti , and the interaction between Li and Ti species can be effectively controlled. The temperature programmed calcination is beneficial to the formation of the middle state (Li 2 TiO 3 ), obtaining the high quality LTO. Mg and F doping can further optimize the hydrolysis and condensation degree of Ti source, the number of crystal nucleus and the particle size. Therefore, the initial first discharged capability of Mg doped LTO and F doped LTO reach to 152.4 mAh/g and 163.1 mAh/g at 5 C respectively, corresponding 32.4 % and 41.7 % enhancing compared to LTO (115.1 mAh/g). Moreover, the discharge voltage of LTO-Mg decreases from 1.5 V to 1.3 V.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2018
·
IF 2.067
Guobo Yang,Baoqiang Xu,Xianjun Lei,Heli Wan,Bin Yang,Dachun Liu,Zhijun Wang
A new process to fabricate porous titanium by calcium vapor in-situ reduction of titanium sespuioxide was presented in this paper. The mixture of Ti 2 O 3 and CaCl 2 powders was preformed and reduced by calcium vapor. The porous titanium structure was obtained after leaching reduction products with hydrochloric acid and deionized water. The pore structure , morphology, composition of reduction products were investigated by SEM-EDS and XRD . The influence of different contents of anhydrous calcium chloride on porosity was discussed. The results show metallic titanium products with two types of pore structures and vacuum sintering treatment strengthened effectively connection between titanium particles. The porosity of porous titanium samples was 62%–82% and more than 90% of pores are open-pores.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2025
·
IF 3.1
Lv Tingting,Song Jianwei,An Yunfei,Hu Tu,Tian Huan,Dou Dehao
Metallic iron influences the carbothermic reduction of titanium oxides in ilmenite, thereby affecting the carburizing rate of the product. This study employs a CH 4 -H 2 mixed gas to reduce various types of ilmenite and for the first time systematically investigates the mechanism by which iron impacts the carburizing rate during the reduction process. The results demonstrate that iron can catalyze the cracking of methane to generate more carbon and hydrogen, which enhances the reduction of ilmenite. Additionally, iron can dissolve carbon, leading to a phase change that modifies the aggregation state of iron. This alteration promotes volume contraction of the reduced ilmenite, subsequently affecting the carburizing rate of the product. From 1150 °C to 1225 °C, the increased solubility of carbon in iron facilitates its conversion from a solid state to an interconnected molten state, obstructing pore spaces. Concurrently, the high viscosity of molten iron hinders the effective utilization of dissolved carbon, leading to a reduced carburizing rate. As the temperature continues to rise, the fluidity of the molten iron increases, causing it to reaggregate and resulting in the reappearance of cavities. Moreover, molten iron can act as a diffusion pathway for carbon, improving the contact area between carbon and titanium oxides, which in turn promotes the formation of carbides.
研究领域:
冶金学
·
材料科学
✓ 已验证
DOI
高影响因子
Petroleum Science
·
2021
·
IF 4.09
Ming Zhang,Yu-Jie Fu,Chao Wang,Yan-Chen Wei,Yong-Kang Gao,Wen-Shu Yang,Lei Fan,Wen-Shuai Zhu,Hua-Ming Li
A series of three-dimensional ordered macroporous (3DOM) W–TiO 2 catalysts have been prepared through a facile colloidal crystal template method. The prepared materials characterized in detail exhibited enhanced catalytic activity in aerobic oxidative desulfurization process. The experimental results indicated that the as-prepared materials possessed excellent 3DOM structure, which is beneficial for the catalytic activity. The sample 3DOM W–TiO 2 -20 exhibited the highest activity in ODS process, and the sulfur removal can reach 98% in 6 h. Furthermore, the oxidative product was also analyzed in the reaction process.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 19
·6929
·
IF 3.748
Shenghao Li,Xiaohuan Wang,Zhiming Shi,Jun Wang,Guojun Ji,Xinba Yaer
Ferrous titanate (FeTiO3) has a high theoretical capacity and physical and chemical properties stability, so it is a potential lithium anode material. In this study, FeTiO3nanopowder and nanosheets were prepared by the sol–gel method and the hydrothermal method. In addition, niobium-ion doping was carried out, the radius of Nb close to Ti so the Nb can easily enter into the FeTiO3lattice. Nb can provide more free electrons to improve the electrochemical performance. Then, the effects of the morphology and niobium doping on the microstructure and electrochemical properties of FeTiO3were systematically studied. The results show that FeTiO3nanosheets have a better lithium storage performance than nanopowders because of its high specific surface area. A certain amount of niobium doping can improve the electrochemical performance of FeTiO3. Finally, a 1 mol% niobium-doping FeTiO3nanosheets (1Nb-FTO-S) electrode provided a higher specific capacity of 782.1 mAh g−1at 50 mA g−1. After 200 cycles, the specific capacity of the 1Nb-FTO-S electrode remained at 509.6 mAh g−1. It is revealed that an increased specific surface area and ion doping are effective means to change the performance of lithium, and the proposed method looks promising for the design of other inorganic oxide electrode materials.Keywords:FeTiO3;niobium doping;microstructure;lithium storage performance
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Wang Jingnan,Zhao Kaiheng,Yao Yongbin,Xue Fan,Lu Fei,Yan Wensheng,Yuan Fangli,Wang Xi
Magnetic field effects (MFE) of ferromagnetic spin electrocatalysts have attracted significant attention due to their potential to enhance catalytic activity under an external magnetic field. However, no ferromagnetic spin catalysts have demonstrated MFE in the electrocatalytic reduction of nitrate for ammonia (NO 3 RR), a pioneering approach towards NH 3 production involving the conversion from diamagnetic NO 3 − to paramagnetic NO. Here, we report the ferromagnetic Fe-TiO 2 to investigate MFE on NO 3 RR. Fe-TiO 2 possesses a high density of atomically dispersed Fe sites and exhibits an intermediate-spin state, resulting in magnetic ordering through ferromagnetism. Assisted by a magnetic field, Fe-TiO 2 achieves a Faradaic efficiency (FE) of up to 97% and an NH 3 yield of 24.69 mg mg cat − 1 at −0.5 V versus reversible hydrogen electrode. Compared to conditions without an external magnetic field, the FE and NH 3 yield for Fe-TiO 2 under an external magnetic field is increased by ~21.8% and ~ 3.1 times, respectively. In-situ characterization and theoretical calculations show that spin polarization enhances the critical step of NO hydrogenation to NOH by optimizing electron transfer pathways between Fe and NO, significantly boosting NO 3 RR activity.
研究领域:
材料科学
·
化学工程
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Donghai Wei,Yinglong Wu,Yan Nie,Junfei Duan,Chenhao Cao,Jianghong Wu,Lingjun Li,Zhaoyong Chen,Guanhua Zhang,Huigao Duan
Red phosphorus (RP), as one of the most promising anode materials for lithium-ion batteries, attracts much attention for its high theoretical specific capacity, cost-effective, and commercial availability. However, poor cycling stability and rate capability caused by huge volume expansion and low intrinsic electronic conductivity hinder the commercialization of RP-based anode. Herein, RP confined in ultrathin hollow carbon-bubble-constructed foam (RP-HC) is developed to improve electronic conductivity and mechanical structure stability. Additionally, low-temperature atomic layer deposition (LT-ALD) technology is adopted to further modify the surface of the RP-HC, forming a core–shell RP-HC@TiO 2 structure with about 5 nm TiO 2 coating layer. Benefiting from the dual confinement of TiO 2 buffer layer and conductive porous carbon host with effective P O C bond, the RP-HC(70%)@TiO 2 electrode delivers an outstanding cycling performance (795.2 mAh g −1 after 200 cycles at 100 mA g −1 ) and rate capability (459.9 mAh g −1 at 2000 mA g −1 , almost 1.6 times and 12 times relative to RP-HC(70%) and RP under the same test condition). In-situ electrochemical impedance spectroscopy analyses are also conducted to investigate the superior Li + storage properties of the RP-HC@TiO 2 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2020
·
IF 2.434
Meng Chao,Lijiang Zhao,Jin Leng,Xinghua Liu,Yutong Li,Junying Zhang,Zilong Tang
Tin oxide (SnO 2 ) with high specific capacity and excellent safety performance has become potential candidate for next generation lithium-ion batteries (LIBs). However, the practical application of SnO 2 is hindered by large volume change and particle aggregation. Herein, a type of three-dimensional (3D) hierarchical porous titanium-based microclews composed of one-dimensional (1D) titanium dioxide (TiO 2 ) nanoribbons and SnO 2 nanoparicles, is synthesized for the first time with the assistance of cationic surfactant , cetyltrimethylammonium bromidewere (CTAB). SnO 2 nanoparticles distribute uniformly on the nanoribbons, and CTAB as growth controller plays a key role in the formation of the uniform and stable hierarchical-structure. The as-synthesized CTAB assisted hierarchical-structure TiO 2 @SnO 2 microclews (CA–TiO 2 @SnO 2 MCs) elelctrode demonstrates outstanding ionic conductivity due to the structure assisting efficient contact between electrode and electrolyte, with a remarkable discharge capacity of 448.3 mAh g −1 after cycling for 500 times at a current density of 500 mA g −1 , and a capacity retention of 558.8 mAh g −1 at 200 mA g −1 after 400 cycles in LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 30
·1901576
·
IF 15.621
Jinli Wu,Kun Jiang,Guohui Li,Zhigang Zhao,Qingwen Li,Fengxia Geng
High-performance, flexible, and lightweight powering electrodes are urgently needed to meet the increasing interest in deformable electronic devices, particularly those utilizing solid-state electrolytes and performing at high charging rates, which unfortunately have remained a formidable challenge. Here, by regularly stacking two-dimensional (2D) titanium oxide and carbide sheets, in which the two kinds of sheets are coupled at the molecular level, a self-standing electrode is achieved with ideal mechanical durability and excellent electrochemical performance, including superb rate performance (delivering a capacity of 114 mAh g −1 in 3.4 min) and good cycling stability (remaining >93% after 1000 cycles at 1000 mA g −1 ). Profiting from these advantages, a flexible and safe full lithium-ion battery, employing a poly(ethylene glycol) diamine-based gel polymer as the electrolyte, possesses an excellent power density of 1412 W kg −1 while maintaining a high energy density of 59 Wh kg −1 , which outperforms most documented flexible batteries that utilize liquid electrolytes and is even comparable with some cells using coin configurations. Importantly, the performance was well maintained under mechanical deformation and after multiple breaking and self-healing cycles, demonstrating the feasibility for practical application in wearable powering devices. The results highlight the numerous possibilities for utilizing sheet materials to fabricate wearable electrode materials.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zhaolin Xu,Xiangnan Chen,Shaoxi Zhang,Ruohao Li,Guangjun Gou
With the development of communication and automatization technology, the demand for electromagnetic absorbing materials is continuously rising. The key problem lies in expanding and regulating the electromagnetic absorption band . Among these materials, carbonized polymers stand out in terms of electromagnetic absorption due to their lightweight, low cost and designability. The carbonized polymers can bridge varies of substances to construct lightweight nitrogen-doped carbon composites, achieving broadband and tunable-band designs. In this study, Fe-C-N anchored TiO 2 hierarchical structure is simply realized by carbonizing polypyrrole/MXene precursors. FeCl 3 are designed to be as the initiator for the polymerization of pyrrole and in situ as a doping Fe source. Moreover, by controlling the carbonization temperature, the electromagnetic absorption band can be obviously regulated from C to Ku band. The multi-layered TiO 2 structure brings enhanced structural losses and better electromagnetic energy dissipation pathways, while the crystalline/amorphous interfaces and hybridizations between Fe-C-N and TiO 2 boost the interfacial polarizations and dipole polarizations. Besides, the introduction of Fe compounds leads to ferromagnetism and magnetic losses, which improves the impedance matching. This work provides referencing ways for the design of broadband electromagnetic absorbing materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COMPTES RENDUS CHIMIE
·
2019
·
IF 2.366
Vi Thuy Thi Phan,Tai Thien Huynh,Hau Quoc Pham,Anh Tram Ngoc Mai,Thy Ho Thi Anh,Thi Hong Tham Nguyen,Thang Manh Ngo,Van Thi Thanh Ho
To overcome the disadvantages of commercial carbonaceous catalysts in direct methanol fuel cells (DMFCs), novel Pt/Ti 1– x Ir x O 2 catalysts are fabricated in this study. Simultaneously, the influence of the Ir composition in the support on the electrocatalytic activities and physicochemical properties of Pt/Ti 1– x Ir x O 2 catalysts is also evaluated. Ti 1– x Ir x O 2 materials with the tunable Ir composition ( x = 0.1, 0.2, 0.3) synthesized via a simple and green hydrothermal route exhibited much higher electrical conductivity and surface area than the undoped TiO 2 . Furthermore, the well-distributed Pt nanoparticles (NPs) with small sizes (∼3 nm) over supports were obtained by using a modified chemical reduction route. Electrochemical results revealed that a series of 20 wt. % Pt/Ti 1– x Ir x O 2 catalysts exhibited superior durability and electrochemical activity toward the methanol oxidation reaction to the commercial 20 wt. % Pt/C (E-TEK) catalyst. According to these results, Ti 1– x Ir x O 2 materials seem to be very promising as a stable catalyst support in the harsh medium of DMFCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 2
·368-376
·
IF 6.707
Tian Wenchao,Yan Fei,Cai Cailing,Wu Zeyi,Zhang Chenchen,Yin Ting,Lao Sijia,Hu Linfeng
The dielectric capacitor has been widely used in advanced electronic and electrical power systems due to its capability of ultrafast charging-discharging and ultrahigh power density. Nevertheless, its energy density is still limited by the low dielectric constant(≈ 2.2) of the commercial dielectric polypropylene (PP). The conventional enhancement strategy by embedding inorganic fillers in PP matrix is still difficult and challenging due to that PP hardly dissolves in any inorganic/organic solvent. In this work, we develop a new strategy including freeze-drying, surface functionalization, and hot-pressing to incorporate Ti 0.87 O 2 monolayers in PP film. A series of uniform composited Ti 0.87 O 2 @PP film has been successfully fabricated with Ti 0.87 O 2 content range of 0–15 wt%. The maximum dielectric constant of the as-prepared Ti 0.87 O 2 @PP film is 3.27 when the Ti 0.87 O 2 content is 9 wt%, which is about 1.5 times higher than that of pure PP. Our study provides a feasible strategy to embed two-dimensional material into commercial PP thin-film with superior dielectric performance for practical application.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）