ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Tong Deng,Henghui Huang,Li Fan,Shaoyi Xu,Hui Li
The performance of a proton exchange membrane electrolyzer is greatly affected by the interfacial contact between the porous transport layer and the catalyst layer. Microporous layers have been widely used in proton exchange membrane fuel cells but have been less studied for proton exchange membrane water electrolysis. In this study, porous transport layers incorporated with microporous layers are developed by using a phase inversion/vacuum sintering method. Characterizations show that the microporous layers uniformly cover the surface of titanium felt without significantly changing its porosity. After vacuum sintering, titanium carbide (TiC) is formed, which is an efficient protective layer against corrosion under acidic conditions and high potential. Compared with a titanium felt reference, the sintered microporous layer-based porous transport layers display better hydrophilicity. Polarization experiments find that the addition of microporous layers decreases the contact resistance, improves the electrochemical performance, and reduces the mass transfer resistance at a high current density. Ex situ and in situ stability testing confirms the material’s enhanced inertness against corrosion.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Xuechao Liu,Chunyan Shi,Jiashuai Wang,Bingbing Fan,Mao Chen,Hailong Wang,Binbin Wang,Wei Li,Yongqiang Chen
There has been an increasing demand for cutting tools with excellent strength, and high wear resistance due to the gradual application of high hardness materials such as high-temperature alloys and surface thermal spray coatings. This study proposes a new design of binder for polycrystalline cubic boron nitride (PcBN) composites. The effects of Al-ZrB 2 -TiC binders on the microstructural evolution, mechanical properties, and thermal shock resistance of the PcBN composites were systematically studied. Al melting at its relatively low temperature, which enables liquid-phase sintering, enhances grain bonding, and stimulates chemical interactions among the binder constituents. These reactions lead to the formation of new phases and promote strong grain bonding, resulting in good mechanical properties. In addition, increasing sintering temperature and cBN content are found to significantly improve the mechanical properties of PcBN composites. The PcBN composites exhibit excellent bending strength of 986.55 MPa, hardness of 42.09 GPa, relative density of 97.6 %, and fracture toughness of 7.66 MPa m 1/2 , respectively. After exposure to air at 1000 °C for 30 min followed by water quenching, the residual flexural strength remained as high as 866.89 MPa, indicating good thermal shock resistance.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 11
·5269-5280
·
IF 2.956
Mian Li,Kai Wang,Ji Wang,Dewu Long,Yanqin Liang,Liu He,Feng Huang,Shiyu Du,Qing Huang
MAX phases were proposed as the interphase materials for carbon fiber reinforced ceramic matrix composites toward the applications in high-dose irradiation and oxidation environments. A thickness-controllable TiC/Ti 2 AlC coating was fabricated on carbon fiber using an in situ reaction in a molten salt bath. The coating showed a multilayered structure, in which the inner layer was TiC and the outer layer was Ti 2 AlC. The influence of the reaction conditions on the morphology, composition, and thickness of the coating was investigated. The oxidation resistance properties of the as-prepared TiC/Ti 2 AlC-coated carbon fiber in static air and water vapor flow at elevated temperatures were investigated. The results showed that the as-prepared TiC/Ti 2 AlC coating could provide good protection to the carbon fiber in both static air and water vapor flow up to 800°C. As these TiC and Ti 2 AlC materials have good irradiation resistance, the present work provides a potential way to develop an irradiation-resistant interphase of carbon-fiber-reinforced ceramic matrix composites for nuclear applications. Furthermore, this work also provides a feasible way to prepare carbide/MAX phase coating on other carbon materials.
研究领域:
材料科学
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陶瓷工程
·
表面涂层技术
·
核材料
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xin Zhang,Yukai Lin,Lingchao Zhang,Zhenguo Huang,Limei Yang,Zhenglong Li,Yaxiong Yang,Mingxia Gao,Wenping Sun,Hongge Pan,Yongfeng Liu
Sodium alanate, NaAlH 4 , has great potential as a hydrogen carrier but suffers from sluggish kinetics and poor reversibility caused by high energy barriers. Transition metal-based catalysts are especially effective in reducing kinetic energy barriers for hydrogen cycling of NaAlH 4 . Herein, we demonstrate a facile fabrication of TiC nanoparticles with 2–4 nm in size supported on carbon (nano-TiC@C). The resultant product consists of approximately 49.2 wt% of TiC and 50.8 wt% of C, and exhibits high and stable catalytic activity for hydrogen storage process of NaAlH 4 . The 7 wt% nano-TiC@C-containing NaAlH 4 releases 5 wt% H 2 starting from 65 °C and reabsorbs all released hydrogen at 30 °C under 100 bar H 2 , outperforming NaAlH 4 modified by commercial TiC nanoparticles (∼50 nm in size). The enhancement is related to the ultrasmall size and high reactive activity of as-synthesized TiC nanoparticles. Moreover, the weak electronegativity of C prevents the formation of Na-based by-products, which are often observed in oxide and halide-containing systems. This finding sheds light on how to design and synthesize high-performance catalytic additives for light-metal hydride-based hydrogen storage materials.
研究领域:
材料科学
·
氢能技术
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高影响因子
Small
·
2023
·Vol. 19
·期 12
·2205835
·
IF 13.3
Shanshan Sun,Minglin Zhao,Qingwei Wang,Shujie Xue,Qinghong Huang,Nengfei Yu,Yuping Wu
It is vital to create flexible batteries as power sources to suit the needs of flexible electronic devices because they are widely employed in wearable and portable electronics. The direct methanol fuel cell (DMFC) is a desirable alternative portable energy source since it is a clean, safe, and high energy density cell. The traditional DMFC in mechanical assembly and its unbending property, however, prevent it from being employed in flexible electrical devices. In this study, the flexible membrane electrode assembly (MEA) with superior electrical conductivity and nanoscale TiC-modified carbon cloth (TiC/CC) is used as supporting layer. Additionally, solid methanol fuels used in the manufacturing of flexible all-solid-state DMFC have the advantages of being tiny, light, and having high energy density. Furthermore, the DMFC's placement and bending angle have little effect on its performance, suggesting that DMFC is appropriate for flexible portable energy. The flexible all-solid-state DMFC's power density can reach 14.06 mW cm −2 , and after 50 bends at 60°, its voltage loss can be disregarded. The flexible all-solid DMFC has an energy density that is 777.78 Wh Kg −1 higher than flexible lithium-ion batteries, which is advantageous for the commercialization of flexible electronic products.
研究领域:
材料科学
·
能源技术
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhaoxin Zhong,Jian Ye,Yang Wang,Yuhan Ren,Jiawei Zhang,Biao Zhang,Feng Ye
The pressureless sintering (PLS) technique holds substantial potential in manufacturing cost-effective composites with intricate shapes. Nonetheless, it can lead to reduced density in titanium matrix composites (TMCs), affecting their mechanical properties. This study introduces a novel approach to producing high-density TMCs utilizing polymer encapsulation on hydride-dehydride (HDH) TC4 particles through wet mixing. The coexistence of the sintering Si-B-Ti/Al-C-N liquid phases and a dual approach to deoxidizing HDH TC4 particles synergistically enhance the compactness of the TMCs, achieving densities as high as 98.5 % during PLS. The densification mechanisms for (TiB+TiC+Ti 3 Si)/TC4 composites under different conditions kinetics were revealed by calculating the effective grain growth exponent and activation energy. The (TiB+TiC+Ti 3 Si)/TC4 composite, produced through PLS at 1300 ℃ for 1.5 hours, exhibits exceptional properties with a compressive strength of 2087 MPa and a fracture strain of 41.7 %. This research will provide a feasible avenue for developing high-performance TMCs using the polymer as the reinforcement source and low-cost HDH TC4 powder during PLS.
研究领域:
材料科学
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机械工程
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118940
·
IF 6.3
Heqiang Chang,Qiang Hu,Yuli Wang,Hao Lu,Haibin Wang,Xuemei Liu,Chao Hou,Xiaoyan Song
TiC addition promoted single-phase formation and simultaneously improved oxidation resistance of (NbTaMoW)C. • TiC makes Ti-Mo-containing subsystems more favorable than Mo-containing ones and lowered mixing Gibbs free energy of HECs. • Enhanced oxidation resistance results from TiC-altered defect energetics and the formation of a denser oxide layer. Understanding component effects is important for the rational design of high-entropy carbides (HECs). This work investigates the effects of TiC addition on solid solution formation and high-temperature oxidation resistance of (NbTaMoW)C through experiments and theoretical calculations. The solid-solution onset and single-phase formation temperatures of the Ti-containing HEC were 200 °C and 50 °C lower than those of the (NbTaMoW)C, respectively. Theoretical calculations show that TiC addition makes Ti-Mo-containing subsystems more energetically favorable than the Mo-containing ones in the Ti-free system, and it lowers the mixing Gibbs free energy of the final HEC, thermodynamically favoring solid-solution formation. Oxidation at 800–1000 °C showed that (TiNbTaMoW)C exhibited improved oxidation resistance, with lower mass gain, smaller oxidation rate constants, and a denser oxide layer. Defect-related calculations further show that TiC increases carbon-vacancy formation energy, stabilizes oxygen at vacancy sites, and raises the energetic penalty for interstitial oxygen incorporation, thereby providing guidance for rational compositional design of HECs.
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高影响因子
Processes
·
2026
·Vol. 14
·期 13
·2072
·
IF 3.4
Tao Wei,Shibing Cai,Liangning Huang,Jianwei Song,Tu Hu,Huanwu Zhan
Methane (CH4) was employed as a carbon source for the reduction and carburization of TiO2via a gas-phase infiltration process to synthesize titanium carbide (TiC). The highly reactive and diffusible carbon species derived from CH4decomposition enable a significant reduction in both reaction time and temperature compared with conventional carbothermal reduction methods. The phase evolution during the CH4-driven reduction–carburization of TiO2was analyzed, and the effects of CH4volume fraction, reaction temperature, and reaction time on the carburization efficiency were systematically investigated, with the phase composition and microstructure of the products also characterized. The optimal conditions in a CH4-Ar system were found to be 10%CH4–90%Ar at 1270 °C for 8 h, yielding a carburization efficiency of 79.1% for TiO2pellets. Increasing the CH4proportion led to more severe carbon deposition, with deposited carbon adhering to the pellet surface and clogging the internal pores. Raising the temperature promoted the reduction–carburization reaction, but excessive acceleration of CH4cracking above 1270 °C caused carbon accumulation on the TiO2surface, forming a carbon shell that lowered the carburization efficiency. Prolonging the reaction time was beneficial for achieving a higher degree of carburization.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Zhenqi Cui,Jia Yao,Tao Mei,Shiyuan Zhou,Baofei Hou,Jing Li,Jinhua Li,Jianying Wang,Jingwen Qian,Xianbao Wang
In our study, TiC-TiO 2 /S composite was successfully prepared with a simple and effective method. For this special micro-mesoporous structure, TiC-TiO 2 can be used as an efficient sulfur storing material, and also restrain the volume expansion of sulfur to a certain degree for its suitable specific surface area. TiO 2 and TiC can suppress the diffusion of polysulfides due to their strong interaction with polysulfides . At the same time, TiC also can remedy the nonconductive defect of sulfur for its good conductivity. With the help of above advantages, the TiC-TiO 2 /S cathode delivers an initial discharge specific capacity of 1218 mAh g −1 at 1 C (1 C = 1675 mA g −1 ) with the sulfur loading of 1.5 mg cm −2 . And when cycles at 0.5 C, a stable capacity of 714 mAh g −1 can be maintained after 500 cycles accompanied with the sulfur loading of 1.1 mg cm −2 .
研究领域:
材料科学
·
能源存储
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高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Baogang Ding,Yunpeng Qu,Kai Sun,Runhua Fan
Epsilon-negative ( ? ′ < 0) and epsilon-near-zero (ENZ) property was demonstrated in titanium carbide/copper calcium titanate (TiC/CCTO) metacomposites. Benefiting from the moderate concentration of free electrons in TiC filler and its adjustable three-dimensional (3D) networks, weakly negative permittivity ( ∼ − 200 at 20 MHz) was achieved. Not only that, tailoring the negative permittivity of metacomposites from ∼ − 200 to ∼ − 2060, ∼ − 4200, ∼ − 14000 and ∼ − 70000 at 20 MHz was realized by simply increasing TiC content. Besides, Drude model was used to explain the radio-frequency (RF) negative permittivity and quantified the collective plasma oscillation in TiC networks.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Bao Zhang,Jiusan Xiao,Shuqiang Jiao,Hongmin Zhu
A unique phenomenon of TiC–TiO 2 reaction at 900 °C is established, forming a quasi-pure phase of abnormal titanium oxycarbide, since it is commonly synthesized at temperatures above 1500 °C. Impurity of Magnéli phase (Ti n O 2 n -1 , 4≤ n ≤9) is also detected in the product. Thermodynamics analysis indicates that the critical C/O concentration of titanium oxycarbide ( x in TiC x O 1- x ) equilibrated with Magnéli phase at 900 °C is around 0.66, typically 0.651 for Ti 4 O 7 . The obtained titanium oxycarbide phase contains metal-vacancy in Ti site, as Ti 1- y C x O 1- x which is reported the first time, differing from stoichiometric vacancy of both Ti site and C/O site in conventional TiC x O 1- x . The dominating part of TiC–TiO 2 reaction at 900 °C is reaction via solid solution as directly introducing the Ti and O atoms of TiO 2 into the FCC structure of TiC, which leads to the formation of metal-vacancy without altering the original lattice size, instead maintaining at the same level of TiC regardless of the variation of corresponding C/O concentration. The obtained maximum concentration of metal-vacancy in Ti 1- y C x O 1- x is 18%, close to the theoretical capacity of 18.9% which exists when the starting molar ratio of TiC and TiO 2 is aiming to the formation of TiC 0.651 O 0.349 , as the critical composition equilibrated with Ti 4 O 7 . The stability of metal-vacancy in titanium oxycarbide is verified by first-principles calculation in the perspective of energy.
研究领域:
材料科学
·
化学工程
·
热力学
·
固体化学
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2026
·
IF 5.2
Muhammad Ali Hamza Shahbaz,Madaminov Sanjarbek Maxmudjon ugli,Hamid Nasir,Maryam Al Huwayz,Muneerah Alomar,Amir Muhammad Afzal,Sohail Mumtaz,Abhinav Kumar
Dysprosium cobalt oxide (DCO)-graphitic carbon nitride (gCN)-MXene hybrid nanocomposites were synthesized with a simple hydrothermal technique for advanced energy storage and catalysis devices. The result of XRD, SEM, and XPS analyses validated that it exhibited high crystallinity, uniform morphology, and a significant amount of surface functionalities. The electrochemical testing was conducted, and the specific capacity (Qs) is estimated to be 1865.9C g −1 at 3 mV s −1 , while the hybrid supercapacitor has a Qs of 280.04C g −1 , energy density (Ed) of 45 Wh kg −1 , and power density (Pd) of 2836 W kg −1 . Furthermore, the composite showed a remarkable electrocatalytic activity with an overpotential of 69 mV and the Tafel slope of 64 mV dec −1 , which indicates that it has good charge transfer property. The findings prove that DCO@MXene@gCN is an electroactive material with multifunctional properties suitable for novel and advanced energy systems. Download: Download high-res image (176KB) Download: Download full-size image
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