APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 126
·期 1
·1-14
·
IF 1.784
Zhou Haikun,Gao Pingping,wang Pan,Xie Zhiyong,Wu Xiaobo
Titanium nitride (TiN) nanoparticles (NPs) were added into polytetrafluoroethylene (PTFE) emulsion for the hydrophobic treatment of carbon papers (CPs). The addition of the nano-sized conducting nanoparticles in impregnation solution could improve the corrosion resistance, electrical conductivity, hydrophobicity and durability of the treated CPs. It is found that the corrosion resistance and electrical conductivity of the as-treated CPs increased gradually as the increment of TiN content. CPs impregnated with PTFE emulsion containing 8 wt% TiN NPs displayed the optimal improved corrosion resistance with corrosion potential and corrosion current density at 0.16 V and 0.056 μA/cm 2 , respectively. Characterizations by SEM, Raman and XPS demonstrate that this improvement is associated with the formation of TiN coating and the improved distribution of PTFE on CPs.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xu Yang,Zhaoxia Zhang,Xiaoyang Wang,Guanghua Wang,Xinlong Tian,Zhifu Wu
Overcoming the limited light harvest and sluggish charge transfer efficiency has remained a long-standing challenge for the practical application of visible-light driven hydrogen evolution . In this work, a novel cobalt doped titanium nitride interlaced nanotube was synthesized through a facile hydrothermal approach and subsequent ammonia gas nitrification route. The optimized Ti 0·75 Co 0·25 N (molar ratio of Ti:Co:N = 0.75:0.25:1) catalyst delivered the highest hydrogen yield in visible-light-induced water splitting, which was almost 2 times higher than the pristine TiN did. Further structure characterizations have unraveled that the cobalt atoms were partially substituted the titanium atoms in crystallite lattice, generating a significant synergistic regulation on band structure and electronic state. As a result, the narrowed energy bandgap, improved charge carrier mobility and lowered over-potential contributed to the high electron-hole separation efficiency and smoothed interface charge transfer, yielding an enhanced photocatalytic activity . This work is a significant contribution to the design of efficient and stable visible light driven water splitting catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 6
·3905-3916
·
IF 3.502
Yongjie Liu,Yue Wang,Yu Zhang,Zhixiong You,Xuewei Lv
Ammonia gas can be simultaneously used as a reductant and nitrogen source to prepare TiN from titania. In this work, the mechanisms on reduction and nitridation of micrometer-sized anatase with ammonia gas have been investigated, using both thermodynamic and experimental studies. The thermodynamic analysis indicated that reduction and nitridation of TiO 2 by NH 3 was feasible. Anatase will undergo different paths to form TiN, depending on the reaction temperature. Upon heating, NH 3 was seen to partially decompose into N 2 and H 2 , although the actual NH 3 decomposition ratio was less than the theoretical value. The experimental results indicated that the obtained titanium nitride was non-stoichiometric (TiN x O 1 −x , x ≤ 1), as it contained a certain amount of oxygen. Based on the phase transformation and X-ray photoelectron spectroscopy analysis, the reduction and nitridation routes were deduced: TiO 2 reacted with NH 3 to form TiN x O 1− x directly, at lower temperatures, and followed the path TiO 2 → Ti n O 2n−1 → TiN x O 1− x , at higher temperatures. Ti n O 2n−1 was determined to be Ti 4 O 7 and Ti 3 O 5 at 1100°C and 1200°C, respectively. Reaction temperature and time significantly affected the oxygen and nitrogen contents in TiN x O 1− x , with the lattice parameter of roasted products gradually increasing—approaching those of pure TiN—with an increase in reaction temperature and holding time. At the same time, the content of oxygen in TiN x O 1− x decreased, and its nitrogen content correspondingly increased.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Jiaojiao Guan,Daorong Li,Jiahui Feng,Peng Xu,Zhaonian Li,Siqi Ge,Hongxia Chen,Kunfeng Zhang
The removal of ammonia (NH 3 ) emitted from agricultural and industrial activities is of great significance to protect human health and ecological environment. Photocatalytic NH 3 oxidation to N 2 under mild conditions is a promising strategy. However, developing visible light photocatalysts for NH 3 oxidation is still in its infancy. Here, we fabricate N-TiO 2 and Ag/AgCl/N-TiO 2 photocatalysts by sol-gel and photodeposition methods, respectively. The introduction of N not only endows TiO 2 with visible light response (absorption edge at 460 nm) but also results in the formation of heterophase junction (anatase and rutile). Thus, N-TiO 2 shows 2.0 and 1.8 times higher than those over anatase TiO 2 and commercial TiO 2 for NH 3 oxidation under full spectrum irradiation. Meanwhile, surface modification of Ag can simultaneously enhance visible light absorption (generating localized surface plasmon resonance effect) and charge separation efficiency. Therefore, the photocatalytic activity of Ag/AgCl/N-TiO 2 is further improved. Furthermore, the presence of N and Ag also enhances the selectivity of N 2 product owing to the change of reaction pathway. This work simultaneously regulates photocatalytic conversion efficiency and product selectivity, providing some guidance for developing highly efficient photocatalysts for NH 3 elimination.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WEAR
·
2023
·
IF 5
Hua Jiang,Xianjun Hou,Qifan Yu,Mohamed Kamal Ahmed Ali
This study comprehensively investigated physicochemical and tribological performance of polyalphaolefin (PAO4) oil introducing oleic acid (OA)-functionalized SiC/TiN hybrid nanomaterials . The dispersion stability , wettability , thermal stability, and friction properties of the nanolubricants (NL) system were greatly improved following the application of hybrid NL. Additionally, the anti-wear and reducing-friction behavior were assessed via a four-ball tribometer. The results showed that the COF and WSD values of wear scar lubricated by hybrid NL were greatly reduced by approximately 32.7% and 35.1%, respectively, compared with the base oil. Finally, it is strongly confirmed that the significant improvement of friction performance is mainly due to improved interfacial effect of NL, the stable chemical tribo-film generated onto the friction surface , and the synergistic effect among SiC, TiN nanoparticles , and OA surfactant .
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Xiaojing Fu,Shuming Guo,Yong Wan,Changsheng Zheng,Qiang Li,Bingchang Liu
Superlubricity was achieved by the addition of copper nanoparticles (CuNPs) as an additive to glycerol, a sustainable lubricant, which was applied to TiN-coated steel that underwent ball-on-flat reciprocating testing at an average contact pressure of 54.6 MPa. A coefficient of friction of ∼ 0.007 and a wear rate of 2.0 × 10 –8 mm 3 /N m were achieved on the TiN coating when lubricated with glycerol + 0.1 wt% CuNPs at a sliding speed of 120 mm/s. XPS and Raman analysis suggested that a surface tribofilm containing CuNPs and a carbon-based film derived from the degradation of glycerol were deposited onto the contact area of the tribopairs, which effectively prevented the direct asperity contact between the steel ball and TiN-coated steel, enabling ultra-low friction.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 3
·753-761
·
IF 2.5
Chu Youqun,Zhang Huixuan,Zhou Huihui,Xu Tengfei,Yan Hui,Huang Zhangkao,Zhao Fengming
The nano-Ag–TiO 2 hollow microsphere precursors were prepared by the one-pot solvothermal method using L-tyrosine as the template agent and reducing agent. Subsequently, the nano-Ag–TiN hollow microsphere composites were formed by reducing nitride in an ammonia-filled atmosphere. The esterification of ethanol solvent and L-tyrosine microdroplet template generates traces of water in situ for the hydrolysis of alkane titanium. As the L-tyrosine microdroplet templates are sacrificed and incorporated into the titanium dioxide matrix, a hybridized hollow structure is formed. With the help of L-tyrosine, the surface of Ag–TiO 2 hollow microsphere precursors appeared folded rough surface, and the nanosilver was mostly distributed in the TiO 2 spherical shell. The constructed Ag–TiO 2 hollow microsphere demonstrated a good linear relationship between the current response value and the concentration in the range of 0.2–220 μM of H 2 O 2 , with the lowest detection limit of 0.04 μM. In the same concentration range, whereas the lowest detection limit of Ag–TiN hollow microsphere was 0.02 μM. The detection results of H 2 O 2 revealed that the Ag–TiN/HMS electrode has outstanding interference resistance, stability, and repeatability.
研究领域:
材料科学
·
电化学分析
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2024
·Vol. 17
·期 11
·2788
·
IF 3
Naixuan Zong,Junli Wang,Zhenwei Liu,Song Wu,Xiaoning Tong,Qingxiang Kong,Ruidong Xu,Linjing Yang
The metal–organic framework (MOF) materials with significant steadiness and a large specific surface area have been popular with supercapacitor material in recent years. However, its application in supercapacitors is restricted due to the low specific capacitance and poor conductivity. Herein, sulfur compounds with a high theoretical specific capacitance and highly conductive titanium nitride (TiN) were introduced into Co-based metal–organic frameworks/nickel foam (Co-MOF/NF) through a two-step hydrothermal technique (nickel sulfide/titanium nitride@ Co-based metal–organic frameworks/nickel foam). In detail, the fabricated nickel sulfide/titanium nitride@Co-based metal–organic frameworks/nickel foam (Ni3S2/TiN@Co-MOF/NF) electrode material exhibits a markedly high specific capacitance (2648.8 F g−1) at 1 A g−1, compared with that (770 F g−1) of the precursor Co-MOF/NF. And its mass specific capacitance is retained 88.3% (8 A g−1) after 5000 cycles. Furthermore, a non-symmetrical supercapacitor (ASC) composed of Ni3S2/TiN@Co-MOF/NF and AC exhibits excellent power density (801.8 W kg−1) and energy density (97.8 W h kg−1). Therefore, Ni3S2/TiN@Co-MOF/NF with excellent electrochemical properties and stability provides new ideas for the development of excellent supercapacitor electrode materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Dongfeng Lv,Bin Zhu,Yi Cui,Hengyong Wei,Jinglong Bu,Feifei Wang,Pengwei Huo,Pengxin Li,Yongsheng Yan
A setaria viridis-like TiN nanofibers with hierarchical structure (noted HSTFs) is synthesized via electrospinning and hydrothermal method. The results reveal that the synthesized HSTFs nanofibers belong to the TiN crystalline phase. The surface of the fibers is uniformly distributed with pore-structured nanorods, which have an average diameter of 55 nm. The HSTFs exhibits a higher specific surface area. Comparing to the TFs||TFs symmetric supercapacitor device, the HSTFs||HSTFs device demonstrates a significantly higher specific capacitance of 177 F g −1 at a current density of 10 mA g −1 . The enhanced electrochemical performance is attributed to the hierarchical and porous structure of TiN fibers, which provides a larger surface contact area and more active sites. This structure is conducive to the construction of a conductive network and improves the reversible proton insertion and chemisorption of electrolyte-electron. This research presents a promising approach for the design and synthesizes of high-performance supercapacitor materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Kezhuo Li,Jin Luo,Longhao Dong,Gaoqian Yuan,Wen Lei,Quanli Jia,Haijun Zhang,Shaowei Zhang
Porous ceramics have attracted extensive attention because of their high porosity, low thermal conductivity , large specific surface area and good corrosion resistance . In this work, TiN porous ceramics with high porosity are successfully prepared via the combination of freeze-drying and in-situ nitridation reaction method using Ti powder and chitosan as raw materials. The influence of the solid content of Ti powder, the concentration of chitosan/acetic acid solution and the nitridation temperature on the morphologies and physical properties of as-prepared TiN porous ceramics are fully investigated. The sample with high porosity of 92.8% and low bulk density of 0.27 g/cm 3 can be obtained through optimal parameters (the solid content of Ti powder is 9.6 wt%, the concentration of chitosan/acetic acid solution is 5 wt%, and the nitridation temperature is 1473 K). Particular emphasize is that the as-prepared TiN porous ceramics can be used as sulfur host material for lithium-sulfur batteries (LSBs). Good rate performance and cycle stability of TiN/S electrodes are achieved by electrochemical performance tests. The initial discharge capacity of TiN/S electrodes is 778 mAh g −1 at 0.5C, and the capacity retention rate is 94% after 200 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 10
·1087-1091
·
IF 0.975
Haikun Zhou,Pan Wang,Pingping Gao,Xiaobo Wu,Zhiyong Xie
Titanium nitride (TiN)-modified hydrophobic-treated carbon paper (CP) was prepared by impregnating CP with polytetrafluoroethylene (PTFE) emulsion containing TiN nanoparticles (NPs). Electrochemical measurements showed that CP witnessed an increase in corrosion resistance and electrical resistivity after treated with 5 wt% PTFE emulsion. Since the sacrifice in electrical conductivity is not beneficial to the application in proton exchange membrane fuel cells (PEMFCs), conductive ceramic NPs – TiN NPs were introduced into the CP to further improve its electrical conductivity. It was found that after adding TiN NPs, the electrical resistivity of CP (immersed in 5 wt% PTFE emulsion containing 8 wt% TiN NPs) decreased to a level (3.8 mΩ cm) similar to that of untreated CP (3.5 mΩ cm), and meanwhile there is a further improvement in corrosion resistance, where the corrosion current density (at 1.4 V) of TiN-modified CP stabilises at the lowest value of 5.50 μA/cm 2 , as compared with 32.8 and 12.7 μA/cm 2 for raw CP and PTFE-treated CP. According to microstructure characterisation, these improvements could be attributable to the formation of conductive networks and improved PTFE distribution due to the addition of TiN NPs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Lei Han,Longhao Dong,Haijun Zhang,Faliang Li,Liang Tian,Guangqiang Li,Quanli Jia,Shaowei Zhang
With the rapid development of energy sources and aerospace engineering, high-performance thermal insulation materials with multiple functions are attracting more and more attentions. Non-oxide ceramic aerogels have application potential in thermal insulation under harsh conditions owing to their good thermal insulation performance and chemical stability. In this work, TiN aerogels were prepared by a combined freeze-casting and carbothermal reduction-nitridation method utilizing TiO 2 and chitosan as raw materials, at 1473 K for 3 h, with a C/TiO 2 molar ratio of 3/1. They showed a specific surface area of 167 m 2 /g and ultralow density of 0.07 g/cm 3 (the relative density of 1.3 %). Their thermal conductivity value was only 0.166 ± 0.0054 W/(m K at 673 K (TiO 2 solid content of 5 wt%). Moreover, the prepared aerogels possessed reasonably high mechanical strength and good high-temperature service performance, suggesting that they can be used under high-temperature conditions as an insulation material.
研究领域:
材料科学
·
航空航天工程
✓ 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）