CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lei Wan,Ziang Xu,Baoguo Wang
To prepare a hydroxide ion conduction membrane with highly alkaline resistance for advanced alkaline water electrolysis, a large-scale and green preparation strategy that pore-filling polytetrafluoroethylene (PTFE) membrane is proposed to fabricate robust alkaline composite membranes, simultaneously enhance the interfacial compatibility between catalyst layer and membrane in membrane electrode assembly (MEA). Upon the rational design, the PTFE/layered double hydroxide (LDH) composite membranes exhibit good hydroxide conductivity, excellent wettability and exceptional alkaline stability, especially showing no change of the area resistance during 2000 h test in 1 M KOH solution at 60 °C. In advanced alkaline water electrolysis, the MEA with PTFE/LDH composite membranes and precious group metal-free (PGM-free) catalysts specifically showed the voltage of 1.8 V at the current density of 1 A cm −2 , while that of commercial Fumasep FAA-3–50 membrane was 2.15 V. The long-term stability is conducted at a current density of 500 mA cm −2 for 180 h. Such performance with low-cost and mass-produced PTFE/LDH composite membranes demonstrates that the large-scale and green preparation strategy may drive the development of membranes for advanced alkaline water electrolysis.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yangping Zhang,Fei Gao,Caiqin Wang,Yukihide Shiraishi,Yukou Du
Engineering robust electrocatalysts is always a key point in direct alcohol fuel cells. Catalysts with a one-dimension (1D) structure are well studied and considered as promising candidates among various catalysts in the past decades; however, the precise regulation on the surface structure of 1D nanomaterials is still a worthy subject. By creatively introducing a trimetallic nanoalloy, core@multishell structure, and 1D nanowire (NW) morphology, we have constructed a kind of novel spiny PtFePd@PtFe/Pt core@multishell 1D NW catalysts with PtFePd as the core and PtFe/Pt as the multishell on the basis of improving catalytic property. The composition-optimized Pt5FePd2 1D NWs display remarkable catalytic properties for ethanol oxidation reaction and methanol oxidation reaction, in which mass activities are 4.965 and 4.038 A mg–1, 4.6 and 5.0 and 4.0 and 9.2-fold higher than Pt/C and Pd/C catalysts. Furthermore, the obtained Pt5FePd2 NWs can also retain favorable stability after durability tests. The unique core@multishell structure, spiny 1D NWs with many steps and kinks, and interior electronic and synergistic effect all contribute to the advanced catalytic performance. The present work has rationally designed the novel 1D PtFePd@PtFe/Pt core@multishell NW catalysts and offered a meaningful guideline for the designing of high-performance electrocatalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2019
·
IF 2.251
Jun Wang,Chengcheng Zeng,Chunhong Zhan,Long Zhang
Nanoenergetic composites composed of polytetrafluoroethylene (PTFE) and fuel (Aluminum) have potential applications in the military and civilian fields owing to high energy density and exothermic reaction. Herein, the ignition, energy output and combustion characteristics of Al/PTFE were tuned by employed carbon nanotubes (CNTs) and graphene based on high thermal conductivity. The highest output energy and combustion speed of PTFE/Al with 3 wt% CNTs are 3158 J/g and 397 m/s, respectively, which are higher than that of PTFE/Al (2106 J/g and 260 m/s) and PTFE/Al with graphene (2201 J/g and 286 m/s). The onset reaction temperature and ignition delay time of PTFE/Al with 3 wt% CNTs are reduced by 80 °C and 0.21 ms, respectively. Furthermore, the flame structure of PTFE/Al with graphene is significantly changed from semicircle to spiculate. This work provides efficient approach to improve reactivity and combustion properties and understand the heat transfer in combustion reaction process of PTFE/Al.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2026
·
IF 8.6
Rongxiang Hu,Fenghua Zhang,Yanju Liu,Jinsong Leng
Shape memory polymers (SMPs) are stimuli-responsive smart materials with great potential for engineering applications. Fiber reinforced SMP composites (SMPCs) are widely used to enhance mechanical properties while retaining shape memory performance. However, although multilayer fiber fabrics reinforced SMPC laminates offer higher mechanical strength, their deformation during shape memory process is often constrained by interfacial restrictions between adjacent plies. In this study, a polytetrafluoroethylene (PTFE) interlayer strategy was developed to decouple adjacent SMPC plies, and PTFE interlayered, carbon fiber reinforced shape memory phthalonitrile laminate composites (SMPN-LC) were fabricated. Mechanical tests indicates that, at an interlaminar bonding area of 20%, SMPN-LC exhibits a tensile strength of 307 MPa and a flexural strength of 426 MPa. At the same bonding area, as the length-width ratio decreases from 6:1 to 2:1, the flexural strain of SMPN-LC increases from 1.8% to 2.9%, which is attributed to an increased length of the PTFE induced interlaminar decoupling region. SMPN-LC exhibits layer-wise shape memory behavior and can be deformed into a temporary anchor-hook structure capable of hanging a 500 g weight. By incorporating shape memory phthalonitrile aerogel (SMPNA) into SMPN-LC to obtain SMPN-LAC, the thermal conductivity decreases to 104 mW/m·K and provided good thermal insulation performance. In the compressed temporary shape, the SMPNA interlayers within SMPN-LAC recovers gradually to form layer-by-layer thermal barrier, maintaining the opposite-side temperature at around 300 °C after 600 s of butane flame exposure. This interlayer strategy endows SMPN-LAC with good thermal insulation with shape memory performance, broadening the application potential of SMPCs.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hui Yang,Eser Metin Akinoglu,Lijing Guo,Mingliang Jin,Guofu Zhou,Michael Giersig,Lingling Shui,Paul Mulvaney
We propose a simple and inexpensive SiO 2 submicron particle synthesis method based on a PTFE helical capillary microreactor. The device is based on Dean flow mediated, ultrafast mixing of two liquid phases in a microfluidic spiral pipe. Excellent control of particle size between 100 nm and 600 nm and narrow polydispersity can be achieved by controlling the device and process parameters. Numerical simulations are performed to determine the optimal device dimensions. In the mother liquor the silica particles exhibit zeta potentials < −60 mV, rendering them very stable even at high particle volume fractions . The current device typically produces around 0.234 g/h of the silica particles.
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
BMC Chemistry
·
2022
·Vol. 16
·期 1
·1-10
·
IF 4.095
Xiang Qing,Qin Jiyao,Qin Taihong,Chen Lu,Zhang Daixiong
Electrophoretic deposition (EPD) coating has become a hot topic due to its simple experiment, wide application, and wide material range. In this study, the PTFE coating was successfully prepared by electrophoretic deposition through the systematic study of electrophoretic deposition kinetics. In particular, in the dispersion system with ethanol as solvent, Nafion and NaOH were simultaneously added as additives to obtain a beneficial synergistic effect on PTFE electrophoretic deposition. And the best additive scheme is: when the concentration of PTFE was 6 g·L− 1 and the deposition time was increased to 20 min, adding 0.10 g·L− 1 Nafion and 0.10 mM NaOH simultaneously. Compared with the scheme with Nafion being only additive, the addition of NaOH can improve the deposition rate from 0.16 mg·cm− 2 to 0.98 mg·cm− 2, and the deposition rate increases by about 6 times. According to electrophoretic deposition kinetics, there is an obvious critical transition time between linear and parabolic regions in the preparation of the coating. Prolonging the arrival of critical transition time is beneficial to effectively achieve stable growth of the coating in a longer time. It is found that a more ideal additive can not only increase the deposition rate of coating, but also significantly accelerate the arrival of critical transition time. Meanwhile, the deposition voltage also has an important influence on the critical transition time. Increasing the voltage can improve the deposition speed but shorten the critical transition time. Therefore, the application of deposition voltage needs to strike a balance between deposition rate and critical time point. The optimal deposition conditions proposed in this work are: deposition voltage 60 V, deposition time 20 min, additive 0.10 g·L− 1 Nafion and 0.10 mM NaOH.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zhu Xiong,Qiaoyun Lai,Jiangyan Lu,Fangshu Qu,Huarong Yu,Xiongbo Chen,Gaosheng Zhang,Wei Zhang,Shuaifei Zhao
A superhydrophobic polytetrafluoroethylene (PTFE) membrane (water contact angle 158 ± 5 o ) was fabricated based on a commercial microporous membrane by surface silanization and fluorination. The engineered PTFE membrane was characterized by various techniques, including scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, laser scanning confocal microscopy , a liquid-liquid porometer, water vapor permeation and contact angle measurements. The prepared PTFE membrane showed a slightly decreased average pore size of 0.37 μm, and thus an increased penetrating pressure of 0.38 MPa compared with the pristine commercial membrane. The developed superhydrophobic PTFE membrane had a very low surface energy of 1 mJ/m 2 , only one third of that of the unmodified commercial membrane. The characterization and membrane distillation (MD) separation results showed that the superhydrophobic PTFE membrane had significantly enhanced antiwetting and antifouling performances compared with the pristine commercial membrane. The developed new PTFE membrane also displayed excellent antifouling, antiwetting and long-term stability during the treatment of real challenging landfill leachate of high salinity and high organics by MD. The fabricated PTFE membrane with simultaneously antiwetting and antifouling properties opens a new avenue for treating challenging waste liquids via MD. This study also provides an important strategy to develop superhydrophobic simultaneously antiwetting and antifouling membranes for stable long-term MD applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Chao Wang,Yangbo Qiu,Chenglin Zhang,Feng Li,Long-Fei Ren,Jiahui Shao
Membrane wetting, scaling and low flux are challenging obstacles for membrane distillation (MD). However, the lack of advanced membranes capable of achieving both high flux and high wetting/scaling resistance constrains MD potential applications. Herein, a dense Janus membrane (JM) was facilely developed by co-depositing a dense PVA/PDA layer on a highly porous PTFE substrate to overcome this dilemma and systematically compared with omniphobic PTFE substrates with varied pore sizes for the first time. Results showed that, unlike flux-resistance “trade-off” observed for PTFE substrates, dense JM effectively resisted 0.4 mM SDS at a high flux of 56.8 LMH and retarded membrane scaling by 20 mM oversaturated gypsum. Robust wetting resistance was primarily attributed to the sieving effect of the sub-nanometer surface layer, which greatly protected substrate from SDS adsorption and feed intrusion, and was less affected by severe surface concentration polarization and relatively low substrate LEP than PTFE substrates. Strongly polar PVA/PDA layer provided a much more thermodynamically unfavorable continuous interface for gypsum adhesion than PTFE substrates, which played a key role in determining anti-scaling behavior. In contrast, gypsum still tended to rapidly cause membrane scaling in stagnant zones within PTFE substrates when flux was increased. This study shall provide new insights in designing high-performance membranes for robust hypersaline wastewater treatment, and highlighting dense JMs with a macroporous substrate and a highly hydrophilic dense surface layer as ideal alternatives.
研究领域:
材料科学
·
化学工程
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Yadong Li,Yajuan Zhang,Liang Lv,Liuyuan Han,Zhen Guo,Han-Pu Liang,Xilong Wang,Yousheng Yin
The rational design of Pt-based alloy electrocatalysts is vital to improve the durability and performance of proton exchange membrane fuel cells (PEMFCs). However, the instability caused by transition metal leaching and insufficient particle confinement remains a major challenge. Herein, the development of highly dispersed PtFe alloys with rare-earth Gd doping and carbon confinement (PtFeGd x /N–C) by a synergistic strategy of coordination engineering and Gd–O species incorporation is reported. A nitrogen-doped porous carbon support was synthesized via pyrolysis of ZIF-8 precursors containing EDTA-FeNa and Gd(NO 3 ) 3 , yielding uniformly dispersed Gd–Fe oxide domains. Subsequent wet impregnation and in situ alloying with H 2 PtCl 6 generated highly dispersed PtFeGd x nanoparticles. The optimized PtFeGd40/N–C catalyst exhibited a high half-wave potential of 0.94 V and a mass activity of 0.94 A mg Pt −1 , with only 0.5 % activity loss after 100,000 durability cycles. Structural characterizations confirmed strong coordination among Pt, Fe, and Gd, with Gd predominantly present as oxidized species. DFT calculations revealed that Gd and Gd–O doping effectively modulate the Pt d-band center, optimize intermediate adsorption energies, and reduce the reaction barrier to 0.332 eV. This work highlights the synergistic role of rare-earth doping and carbon confinement in enhancing ORR activity and stability, offering a promising strategy for the development of durable Pt-based electrocatalysts for PEMFCs.
研究领域:
电催化
·
材料科学
·
能量转换
·
纳米材料
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zhigao Ma,Ziwen Wei,Bingyan Jiang,Lu Zhang
The electrodeposition of Ni–P–PTFE nanocomposites offers an effective approach to reduce mold–polymer interface adhesion and improve the replication of polymer micro features in injection molding. However, it is still challenging to fabricate Ni–P–PTFE nanocomposites with low internal stress and nanoscale surface roughness in electrolytes containing high PTFE concentrations. In this study, cetyltrimethylammonium bromide was introduced into the electrolytes to achieve a good dispersion of PTFE nanoparticles. Ni–P–PTFE nanocomposites with various compositions were successfully electrodeposited, and their tribological properties were analyzed. The electroformed Ni–P–PTFE nanocomposites with high PTFE and phosphorus contents showed a low surface roughness and surface energy compared to nickel electrodeposits. Ni–P–PTFE nanocomposites also exhibited a low coefficient of friction (COF) and wear loss when electroformed from an electrolyte containing 32 g/L phosphorus acid and 5 g/L PTFE nanoparticle. The COF of Ni–P–PTFE against stainless steel and poly(methyl methacrylate) was 0.2 and 0.12, respectively, representing a decrease of 80% and 85% compared to nickel electrodeposits. These enhancements in self-lubricating performances were primarily attributed to the low surface roughness and a shift in wear modes from adhesive wear to predominantly mild abrasive wear.
研究领域:
材料科学
·
表面工程
·
摩擦学
·
电化学
·
制造工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2025
·Vol. 36
·期 17
·175701
·
IF 2.8
Wenjuan Zhang,Kangning Xiong,Dashuai Yan
The wear and corrosion resistance of water-based polytetrafluoroethylene (PTFE) coating need to be further improved to cope with various harsh environmental conditions. In this paper, a mulberry-like ZSM-5 molecular sieve was prepared and then was modified to enhance the uniformity, wear resistance and hardness of PTFE coating. In addition, a ZSM-5/MoS2/PTFE coating was developed by adding MoS2 in the chemical composition of coatings, which significantly increased the critical cracking thickness of PTFE to 27 μm. The wear amount of ZSM-5/MoS2/PTFE coating is only 5.7 mg, and after 680 h of salt spray, there is no obvious corrosion on the surface. The friction coefficients under applied loads of 5 N, 10 N, and 20 N are 0.007, 0.057, and 0.055, respectively. The experiment results show that the coating possesses excellent lubrication, wear resistance, and corrosion resistance, and its performance and cost are far superior to commercial products.
研究领域:
材料科学
·
表面工程
·
摩擦学
·
腐蚀科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Qian Yang,Sifan Zhang,Fengshun Wu,Lihua Zhu,Guang Li,Mingzhi Chen,An Pei,Yingliang Feng
Direct methanol fuel cells (DMFC) are widely considered to be an ideal green energy conversion device but their widespread applications are limited by the high price of the Pt-based catalysts and the instability in terms of surface CO toxicity in long-term operation. Herein, the PtFe alloy nanoparticles (NPs) with small particle size (∼4.12 nm) supported on carbon black catalysts with different Pt/Fe atomic ratios (Pt 1 Fe 2 /C, Pt 3 Fe 4 /C, Pt 1 Fe 1 /C, and Pt 2 Fe 1 /C) are successfully prepared for enhanced anti-CO poisoning during methanol oxidation reaction (MOR). The optimal atomic ratio of Pt/Fe for the MOR is 1:2, and the mass activity of Pt 1 Fe 2 /C (5.40 A mg −1 Pt ) is 13.5 times higher than that of conventional commercial Pt/C (Pt/C-JM) (0.40 A mg −1 Pt ). The introduction of Fe into the Pt lattice forms the PtFe alloy phase, and the electron density of Pt is reduced after forming the PtFe alloy. In-situ Fourier transform infrared results indicate that the addition of oxyphilic metal Fe has reduced the adsorption of reactant molecules on Pt during the MOR. The doping of Fe atoms helps to desorb toxic intermediates and regenerate Pt active sites, promoting the cleavage of C–O bonds with good selectivity of CO 2 (58.1%). Moreover, the Pt 1 Fe 2 /C catalyst exhibits higher CO tolerance, methanol electrooxidation activity, and long-term stability than other Pt x Fe y /C catalysts.
研究领域:
电化学
·
材料科学
·
催化
·
能量转换
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）