Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 25
·13196-13203
·
IF 8.867
Bowen Ren,Dongqi Li,Qiuyan Jin,Hao Cui,Chengxin Wang
The platinum-like behavior of tungsten carbides has made them one of the most promising electrocatalysts for the hydrogen evolution reaction (HER). So far, however, their poor activity has kept them far away from practical application. Related research has been basically focused on the form of particles with poor nano-structures, which is not conducive to further development. There is an urgent need to develop a versatile and facile method to synthesize tungsten carbide nanostructures with high active site density. Here we developed a plasma-assisted carburization method to synthesize porous tungsten carbide hybrid nanowires (p-WCx NWs) on carbon cloth. Benefitting from the rapid carburization process with a unique etching-effect in the plasma, the resulting p-WCx NWs are provided with porous nano-structures and an appropriate carbon coating layer. They exhibit excellent HER performance with a small onset potential of 39 mV, η10 (overpotential to drive a current of 10 mA cm−2) of 118 mV, and Tafel slope of 55 mV dec−1 in acid solution, and an onset potential of 56 mV, η10 of 122 mV, and Tafel slope of 56 mV dec−1 in alkaline solution. These performances are superior to those reported for W-based carbide electrocatalysts to date. Impressively, the p-WCx NWs/CC electrode could sustain more than 40 h of hydrogen production at the current density of 20 mA cm−2 without observable deterioration in both strong acid and alkaline solutions.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2018
·Vol. 2018
·期 1
·1634814
·
IF 2.207
Lianbing Zhong,Guihong Geng,Yujin Wang,Feng Ye,Limeng Liu
A fully dense TaC ceramic was prepared by hot pressing using 10 mol% ZrC plus 5 mol% Cu as a sintering aid. Formation of (Ta, Zr)C solid solution (ss) by reaction between TaC and ZrC facilitated densification. Addition of Cu refined the microstructure and consequently improved flexural strength of the TaC ceramics. TEM investigation found ubiquitous precipitation of nanocrystallites at multigrain conjunctions. The nanocrystallites were (Ta, Zr)C solid solution with uniform dispersion in an oxygen-rich glassy matrix. Although formation of nanoprecipitates may not much affect the mechanical properties of the TaC ceramic, the structure suggested a new type of nanoceramic worth further research.
研究领域:
材料科学
·
陶瓷学
·
固态化学
·
显微结构分析
·
复合材料
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Jin Jia,Yuan Yuan Zhu,Ya Fei Zhang,Ruo Yu Chen,Bao Lin Xing,Ai Guo Zhou
Carbide-derived carbons (CDCs) are produced from carbides by removing non-carbon elements in the process of selective etching. In this paper, CDC was prepared from TiC by chlorination at the temperature range of 600~1100°C. In the chlorinating process, carbide-derived carbon with different microstructure was obtained by controlling the reaction temperature. The structures of CDC were revealed with X-ray diffraction and Raman spectroscopy. The morphologies of CDC were analyzed by scanning electron microscope. From X-ray diffraction analysis, the CDC obtained from TiC in this experiment mainly consisted of amorphous carbon. Basing on scanning electron microscopy, carbide-derived carbon from TiC maintained the shape and size of TiC particles. Keywords: Carbide-derived carbons; chlorination; TiC
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yulei Ren,Xuming Zhang,Hao Song,Chaoran Pi,Jianping Li,Xingju Liu,Chan Lin,Pengcheng Wei,Zhuo Li,Paul K. Chu
The advancement of non-precious electrocatalysts with high efficiency is crucial for the industrial implementation of the hydrogen evolution reaction (HER). In non-acidic environments, the dissociation of water and interactions between hydrogen and the catalyst are pivotal. This research presents a novel hybrid electrocatalyst, comprising a molybdenum oxycarbide and carbide heterojunction integrated onto carbon cloth (MoOC-Mo 2 C/C), which is fabricated through in situ interface engineering. The MoOC-Mo 2 C catalyst demonstrates exceptional electrical conductivity and remarkable HER performance across a wide pH range, particularly in alkaline conditions, as exemplified by Tafel slope of 38 mV dec − 1 , an ultralow overpotential of 45 mV at a current density of 10 mA cm −2 , and notable long-term stability. Both experimental findings and theoretical analyses suggest that the incorporation of oxygen into the carbide structure enhances water adsorption and lowers the energy barrier for water dissociation. Furthermore, the distinct work functions of MoOC and Mo 2 C facilitate effective electron transfer from MoOC to Mo 2 C, optimizing the energy of hydrogen adsorption and significantly enhancing the activity and kinetics of alkaline HER. Our results underscore the promising potential of this highly efficient non-precious electrocatalyst, which exhibits a pronounced affinity for water molecules, in facilitating hydrogen evolution in alkaline media.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yingjie Ding,Chaoyang Zhu,Zezhong Xu,Hongdian Lu,Kunhong Hu,Ping Chen,Wei Yang,Jinsong Xie
Given the scarcity of freshwater and the abundance of seawater resources, electrochemical seawater electrolysis is a more competitive and efficient method for hydrogen production, but it still remains challenging due to the lack of catalysts with efficient activity and corrosion resistance. Among various strategies to enhance catalytic activity, bimetallic carbides have emerged as a promising approach due to their synergistic effects and tunable electronic properties. In this paper, the Fe 3 C-Mo 2 C structure embedded on carbon nanofibers (referred to as Fe 3 C-Mo 2 C@CNFs/0.15) was successfully synthesized by the electrospinning-pyrolysis process. Fe 3 C-Mo 2 C@CNFs /0.15 exhibited superior OER activity in both alkaline freshwater and simulated seawater, with low overpotentials of 228 mV and 247 mV at 10 mA cm -2 , and Tafel slopes of 34.0 mV dec -1 and 37.0 mV dec -1 , respectively, due to its abundant active sites, high conductivity, and fast kinetics. Moreover, the electrolytic cell with Fe 3 C-Mo 2 C @CNFs/0.15 as both cathode and anode achieved 10 mA cm -2 at low cell voltages of 1.65 V and 1.69 V, respectively. It also demonstrated excellent long-term stability up to 48 h and corrosion resistance. This work not only provides a novel strategy for designing low-cost, high-performance OER electrocatalysts but also paves the way for practical applications in seawater electrolysis for sustainable hydrogen production.
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 1
·70-78
·
IF 2.956
Ping Hu,Yuan Cheng,Xiang Guo,Chen Ma,Peitao Hu,Qiang Qu,Hong Zhao,Shanyi Du
Inspired by grouting technique in architectural engineering, an innovative method of slurry injection and vacuum impregnation was put forward to introduce nanosized ZrC–SiC ceramics into PyC modified 3-D needle-punched carbon fiber preform homogeneously and continuously, followed by spark plasma sintering to prepare C f /ZrC–SiC with graceful mechanical responses. The composite possessed improved fracture toughness and work of fracture at 5.37 ± 0.25 MPa∙m 1/2 and 951 ± 12 J/m 2 , 50% and nearly one order of magnitude higher than those of ZrC–SiC composite, respectively, with rivaling flexural strength at 177 ± 8 MPa synchronously. A graceful fracture mode was embodied in an obviously extended yield plateau with increased failure displacement by 300%. This enhancement was attributed to the uniform and continuous combination of ZrC–SiC with carbon fiber preform as well as protection and interface tailoring from PyC coating. The study offered an easy and effective method of preparing 3-D fiber reinforced ceramic matrix composites.
研究领域:
材料科学
·
建筑工程
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Huadong Fu,Yan Qin,Zhenyue Zou,Jiamin Fan,Chenyi Xue
The interlaminar strength of polymer matrix laminates significantly affects their performance. Z-pinning is an effective method for improving the interlaminar performance of laminates. However, it remains a challenge to improve the interlaminar performance of polymer matrix laminates at high temperatures. In this study, the interlaminar performance of silica/phenolic laminate after high-temperature pyrolysis was enhanced by using a boron carbide/silicon carbide fibre (B 4 C/SiC f ) composite pin. Experimental results revealed that the in-plane interlaminar shear strength (ILSS) of the pyrolyzed B 4 C/SiC f z-pinned laminates was above 3.0 MPa, which was 110% higher than that of the unpinned laminate. In addition, X-ray photoelectron spectroscopy, Raman spectroscopy, and thermogravimetric analysis revealed that the combined effect of B 4 C and SiC fibres in the pin on the interlaminar performance of the laminate at high temperatures due to the enhancement in the interlaminar strength of the composite. Furthermore, the ILSS of the laminate increased when the z-pin content of the B 4 C/SiC f pins increased; however, when the content of the z-pin further increased, the vertical interlayer direction would happen the brittle fracture.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 6
·1097
·
IF 4.324
Xueying Mu,Yunhui Li,Xiaoguang Liu,Changde Ma,Hanqing Jiang,Jiayi Zhu,Xuecheng Chen,Tao Tang,Ewa Mijowska
Polyethylene terephthalate (PET) plastic has been extensively used in our social life, but its poor biodegradability has led to serious environmental pollution and aroused worldwide concern. Up to now, various strategies have been proposed to address the issue, yet such strategies remain seriously impeded by many obstacles. Herein, waste PET plastic was selectively carbonized into three-dimensional (3D) porous carbon nanosheets (PCS) with high yield of 36.4 wt%, to be further hybridized with MnO2nanoflakes to form PCS-MnO2composites. Due to the introduction of an appropriate amount of MnO2nanoflakes, the resulting PCS-MnO2composite exhibited a specific capacitance of 210.5 F g−1as well as a high areal capacitance of 0.33 F m−2. Furthermore, the PCS-MnO2composite also showed excellent cycle stability (90.1% capacitance retention over 5000 cycles under a current density of 10 A g−1). The present study paved an avenue for the highly efficient recycling of PET waste into high value-added products (PCSs) for electrochemical energy storage.Keywords:PET;waste plastic;carbonization;energy storage
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 70
·40490-40497
·
IF 2.936
Lizhen Zeng,Shaofei Zhao,Lixia Zhang,Miao He
A novel macroscale porous structure electrode, molybdenum carbide nanoparticles-modified carbonized cotton textile (Mo2C/CCT), was synthesized by a facile two-step method and used as an anode material for high-performance microbial fuel cells (MFCs). The characterization results show that the carbonized cotton textile modified with Mo2C nanoparticles offers a great specific surface area (832.17 m2 g−1) for bacterial adhesion. The MFC using Mo2C/CCT anode delivers the maximum power density of 1.12 W m−2, which is 51% and 116% higher than that of CCT and unmodified carbon felt anodes under the same conditions. The high power density is mainly due to the Mo2C nanoparticles with good biocompatibility and high conductivity and superior electrochemical activity, as well as the macroscale porous structure of carbonized cotton textile, which facilitate the formation of electroactive biofilm and improve the electron transfer. This paper introduces a feasible way to synthesize cost-effective and high-performance anode materials for MFCs.
研究领域:
环境科学
·
能源材料
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2024
·
IF 1.2
Wei Zhang,Guoqin Jiang,Yang Liu,Zongyi Deng,Zhixiong Huang,Xueyuan Yang
Carbon fiber/phenolic resin composites (CF/Ph) are often used on the surface of hypersonic vehicles as thermal protection materials. In this paper, the composite materials were prepared by a compression molding process with carbon fiber and boron phenolic resin modified by TiC and B4C. The high-temperature flexural strength and anti-ablation behavior of the composites (TB) were studied. The results showed that the residual weight yield at 1500 °C of TB-10 (B4C content of 10 phr) increased by 39.22% compared to that with no B4C (TB-0). The flexural strength of TB-10 was increased by 19.51% and 19.69% at 1400 °C and 1600 °C, respectively, with respect to TB-0 at the same temperatures. The linear ablation rate and mass ablation rate of TB-10 were reduced by 24.32% and 5.58%, respectively, compared with TB-0. By exploring the anti-ablative mechanisms, it was revealed that PyC, liquid B2O3 and TiO2, all of which were formed at high temperatures, tended to fill the inner cracks of the composite and, therefore, prevent the oxide to further diffuse in. Along with the outer ceramic layer, the three components above play a synergistic effect to improve the ablative property.
研究领域:
材料科学
·
航空工程
·
复合材料
·
高温技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Fei Gao,Bo Liao,Wenmiao Li,Rui Yu
Molten salt electrorefining offers a promising approach for green and efficient recycling of waste cemented carbides. However, the conventional halide-based electrolytes suffer from volatile tungsten halide losses and only recover metallic tungsten, necessitating energy-intensive carburization to recover tungsten carbide (WC). Herein, we propose a novel electrolytic refining and recovery method based on an oxygen-containing CaCl 2 -CaO molten salt electrolyte. The introduction of CaO suppresses the formation of volatile tungsten halides, enabling simultaneous dissolution of carbon (C) and tungsten (W) in the WC-Co anode to non-volatile CaCO 3 and CaWO 4 , respectively. Retention of Co in the anode slime is achieved through controlling anodic potential, realizing component separation. The dissolved CaCO 3 and CaWO 4 are reduced at the cathode, resulting in the generation of WC powder. This work accomplishes the direct recycling of WC from spent cemented carbides without intermediate stages. The composite products of WC and carbon are deposited on the cathodes, of which morphologies are comprised of granular aggregates and flakes. The presence of carbon suppresses the formation of W 2 C and W. However, the residual carbon does not affect hard alloy reprocessing since the W/C ratio can be adjusted via controlled W addition during subsequent alloying. This paper proposes a novel short-process green recycling technology for strategic tungsten resources.
研究领域:
材料科学
·
冶金学
·
电化学
·
回收技术
·
可持续加工
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yu Wang,Zhi-Bo Li,Kai-Fei Wang,Guo-Hua Zhang
Tungsten borides are special compounds with potential applications in superhard materials, anti-friction materials, and catalytic materials. In this study, a new synthetic method for tungsten boride is proposed using tungsten (W) and boron carbide (B 4 C) as raw materials. First, the boronization reaction between W and B 4 C was carried out at a high temperature; then, the boronization products were reacted with calcium to generate CaC 2 for decarburization. After acidic leaching of the CaC 2 and Ca, pure tungsten boride could be prepared. By investigating the reaction between different ratios of W and B 4 C, it was found that only pure W 2 B and WB were synthesized in the current method, and W 2 B 5 could react rapidly with Ca to form WB and CaB 6 . However, in the absence of a decarburization treatment after the boronization process, carbon-containing WB (C content = 1.2 wt%) and W 2 B 5 (C content = 3.4 wt%) could also be prepared. In addition, it was concluded that the prepared tungsten boride roughly maintained the morphology and particle size of raw W, and ultra-fine tungsten boride could be synthesized with ultra-fine W powder at a low boronization reaction temperature.
研究领域:
材料科学
·
无机化学
✓ 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）