CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Mohammad Farhadpour,Guimei Liu,Qinglan Zhao,Qihua You,Mingguang Pan,Reza Bagheri,Gholamreza Pircheraghi,Minhua Shao
Developing high-performance anion exchange membranes (AEMs) with balanced properties is crucial for the advancement of AEM fuel cells. However, the current performance and durability of AEMs are not promising due to the lack of balance in their properties, where one property, such as swelling ratio, is often sacrificed for another, such as hydroxide conductivity. Consequently, despite recent progress, achieving a trade-off among the various properties of AEMs remains a substantial challenge. Herein, we address this issue through the optimization of crosslinking degree in ether-free polyfluorene-based AEMs. The results demonstrate that an optimal crosslinking degree significantly improves the swelling ratio (<15.9 %), water uptake (<78.0 %), and mechanical properties (>35 MPa), while simultaneously enhancing hydroxide conductivity (>144.6 mS cm -1 ), owing to improved microphase separated morphology. Moreover, the alkaline and oxidative stability of the prepared membranes surpasses that of most state-of-the-art AEMs and represents one of the best-reported chemical stability results, with over 93 – 95 % remaining hydroxide conductivity, ion exchange capacity, and tensile strength after 1080 h in 3 M NaOH solution at 80 °C. Furthermore, the AEM fuel cell achieves a peak power density of 1.03 W cm −2 and excellent durability with a voltage decay rate of 0.62 mV h −1 , surpassing the performance of commercial PiperION TM AEM under identical testing conditions.
研究领域:
材料科学
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能源化学
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燃料电池研究
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·114509
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IF 4.316
Yu Bai,Min Xiao,Zhiheng Huang,Dongmei Han,Chengxin Wang,Shuanjin Wang,Yuezhong Meng
A series of composite polymer membranes composed of poly [2,2''-(p-oxydiphenylene)-5,5''-benzimidazole] (OPBI) and sulfonated poly (fluorenyl ether ketone) (SPFEK) were developed with enhanced mechanical integrity and superior oxidative stability. The phosphonic acid (PA) doped OPBI-SPFEK membranes were then fabricated for the high temperature-proton exchange membrane fuel cells (HT-PEMFCs) application. It is suggested that an ionically crosslinked structure can be formed by the intense interaction among the protonated benzimidazolium, sulfonate groups, and PA molecules. With lower acid content and swelling ratio, the composite membranes afforded satisfactory proton conductivity and much higher tensile strength than the pristine OPBI. A maximum conductivity of 0.050 S cm−1 was reached by OPBI-SPFEK-10% at 180 °C, with tensile strength as high as 24.7 MPa. The single fuel cell from the optimized OPBI-SPFEK-10% exhibited the highest peak power density of 727 mW cm−2 at 160 °C, which was 21% higher than that from the pristine OPBI.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2015
·Vol. 53
·期 12
·1457-1463
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IF 3.113
Zilong Zhang,Pan Hu,Xiao Li,Hongmei Zhan,Yanxiang Cheng
Novel triarylamine-based coordination-saturated aryl Pd(II) halide complexes ligated by PEt 3 , PCy 3 , and P( o -tol) 3 were successfully synthesized by direct oxidative addition of aryl halide to the corresponding Pd(0) precursors. Suzuki–Miyaura coupling polymerization of 2-(7-halide-9,9-dioctylfluoren-2-yl)−1,3,2-dioxaborinane with these Pd(II) complexes as initiators was investigated for the synthesis of poly(fluorene)s with triarylamine end group. Pd(II) complexes with PCy 3 or P( o -tol) 3 exhibited catalytic activity and realized the catalyst-transfer polycondensation at 75 °C and room temperature, respectively, while the polymerization using Pd(II) catalyst ligated by PEt 3 did not proceed, which indicated that the bulky phosphine ligands could facilitate the reductive elimination and further promote the polymerization. In addition, the dimeric Pd(II) complex with P( o -tol) 3 can convert into monomeric Pd(II) intermediate with an open coordination site, which had a higher activity. The end groups of the afforded polyfluorene were analyzed by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry, in which the Ar/H end groups are indicative of the catalyst-transfer polymerization. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53 , 1457–1463
研究领域:
高分子化学
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有机合成
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金属有机化学
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功能材料
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聚合反应机理
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Kangdi Guan,Ziwei Zhang,Qiang Zhang,Pinghua Ling,Feng Gao
Herein, this paper reports a simple and label-free photoelectrochemical (PEC) sensor based on the organic semiconducting conjugated polymer-polyfluorene derivative, poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(6-{4-ethyl-piperazin-1-yl}-2-phenyl-benzo{de}isoquinoline-1,3-dione)] (PFNA). The PFNA was designed and obtained the lowest unoccupied molecular orbital (LUMO)/highest occupied molecular orbital (HOMO) values via spectral characterizations. The PFNA modified electrode produced a stable and enhanced photocurrent signal under white light irradiation at a bias of −0.1 V in phosphate buffer solution. A sensitive increment of the photocurrent was observed with the addition of p -phenylenediamine ( p -PD). A possible mechanism for this photoelectrochemical process including the photoexcitation of the polymer, electron injection from polymer toward the electrode, and the hole-scavenging process by the reductants were studied. The π bond in the polymer might facilitate the photoelectrochemical process owing to the enhanced electronic coupling between the polymer and the reductants. A PEC analysis on p -PD has been carried out to evaluate the photoelectrochemical performances of the modified electrode, which presents the wide linear ranges of 0.2–400 μM, with a lower detection limit of 0.13 μM. This work reports the PEC performance of organic semiconducting conjugated polymer-polyfluorene derivative, which would promote more efficient photoelectrochemical design of sensors and devices.
研究领域:
分析化学
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材料科学
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生物医学工程
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产品关联
DOI
高影响因子
RSC Advances
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2013
·Vol. 3
·期 35
·15467-15474
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IF 2.562
Yufei Wang,Shuanjin Wang,Min Xiao,Dongmei Han,Michael A. Hickner,Yuezhong Meng
Sulfonated poly(fluorenyl ether ketone) (SPFEK) membranes have been first modified by layer-by-layer (LbL) self-assembly of positively charged polyelectrolyte PDDA (poly(diallyldimethylammonium chloride)) and negatively charged PSS (poly(sodium styrene sulfonate)). The membranes were investigated as an ion exchange membrane for vanadium redox flow batteries (VRBs). The permeability of the vanadium ions in VRBs was effectively suppressed by depositing the LbL thin film on the SPFEK membrane. The permeability decreased with increasing the number of PDDA/PSS bilayers. For the membrane with two self-assembly bilayers of PDDA/PSS, 50% and 10% of vanadium ion permeability of a pristine SPFEK and Nafion 117 membranes can be afforded, respectively. Moreover, the oxidative stability of the PDDA/PSS-SPFEK composite membrane is improved remarkably compared with the pristine one. Consequently, the performance of VRBs using the PDDA/PSS-SPFEK composite membrane exhibits the highest coulombic efficiency (CE) of 82.1% at 30 mA cm−2 and the longest duration stability in the self-discharge test.
研究领域:
电化学
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能源材料
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膜科学
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储能技术
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高分子化学
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DOI
高影响因子
SOLID STATE PHENOMENA
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2011
·
IF 0
Xin De Tang,Fa Qi Yu,Ye Chen,Xin Wang,Mei Shan Pei
Novel polyfluorene derivatives with azobenzene moieties to attaching to the polymer backbone via a flexible alkyl spacer were synthesized by electrochemically direct anodic oxidation in boron trifluoride diethyletherate (BFEE). The physical, optical and fluorescent properties of the synthesized polymers were characterized by UV-vis spectroscopy and fluorescent spectroscopy. As conducting and optical materials, these polymers can be promising in the field of photoelecrtonics area.
研究领域:
材料科学
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光电学
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高分子化学
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DOI
JOURNAL OF MEMBRANE SCIENCE
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2013
·
IF 4.093
Jingjing Pan,Shuanjin Wang,Min Xiao,Michael Hickner,Yuezhong Meng
Sulfonated poly(fluorenyl ether ketone) (SPFEK) membranes were modified with layered proton conductors zirconium phosphate sulfophenylenphosphonates (ZrPSPP) to improve the proton conductivity and mitigate vanadium ions crossover. The effects of ZrPSPP filler loading on the microstructure and chemical–physical property of SPFEK/ZrPSPP composite membranes as well as the vanadium redox flow battery performance are reported. The uniform dispersion of ZrPSPP sheets in the SPFEK matrix is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX). Since the sulfonic acid groups on the aromatic main-chains are less flexible, the proton channels in the pristine SPFEK membranes are relatively narrow and not well connected. The intensive sulfonic acid groups on ZrPSPP fillers increase the water uptake and the hydrophobic/hydrophilic microphase separation of the composite membranes, resulting in improved proton conductivity. The impermeable nanoplates demonstrate to be a potential physical barrier for vanadium ion diffusion. The VRB assembled with the SPFEK/5 wt%ZrPSPP composite membrane shows longest discharge time and maximal coulombic efficiency among VRBs using the pristine SPFEK and other hybrid SPFEK/ZrPSPP and Nafion 117 membranes.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
POLYMER
·
2011
·Vol. 52
·期 23
·5312-5319
·
IF 3.829
Dongyang Chen,Shuanjin Wang,Min Xiao,Dongmei Han,Yuezhong Meng
High-molecular-weight bulky-block poly(fluorenyl ether thioether ketone)s were successfully synthesized by a two steps one-pot protocol using N,N′ -dimethy- S -carbamate masked dithiols for vanadium redox flow battery (VRB) application. The followed sulfonation procedure gave birth to novel sulfonated block poly(fluorenyl ether thioether ketone)s (SPFETKs) with controlled ionic exchange capacities (IEC). Membranes with proton conductivities higher than (IEC > 1.66 mequiv. g −1 ) or comparable to (IEC < 1.66 mequiv. g −1 ) that of Nafion117 membrane were achieved. The VO 2+ permeabilities of SPFETKs membranes were much lower than that of Nafion117 membrane. The thermal properties, mechanical properties, oxidative stability , water uptake, proton conductivity, VO 2+ permeability and cell performance were investigated in detail.
研究领域:
高分子化学
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能源材料
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电化学
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膜科学与技术
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功能高分子
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DOI
高影响因子
ACS Biomaterials Science & Engineering
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2018
·
IF 4.432
Xuezhi Zhao,Kaicheng Deng,Fangjun Liu,Xiaolong Zhang,Huiru Yang,Jinlei Peng,Zengkui Liu,Liwei Ma,Baoyan Wang,Hua Wei
An elegant integration of light-emitting segments into the structure of polymeric delivery systems endows the resulting self-assembled nanovehicles with the diagnostic ability toward an enhanced therapeutic efficiency. A variety of polyfluorene (PF)-based binary delivery systems were designed and developed successfully, but PF-based ternary formulations remain rarely explored, likely due to the synthetic challenge. To develop a universal synthesis strategy toward linear conjugated amphiphilic triblock copolymer for cancer theranostics, herein we focused on the functionalization of the PF terminus for further chain extension and prepared well-defined PF-based amphiphilic triblock copolymers, PF-b-poly(ε-caprolactone)-b-poly(oligo(ethylene glycol) monomethyl ether methacrylate) (PF-b-PCL-b-POEGMA), by integrated state-of-the-art polymer chemistry techniques, including Suzuki reaction, ring-opening polymerization, atom transfer radical polymerization, and click coupling. The resulting conjugated amphiphilic triblock copolymers can self-assembe into core–shell-corona (CSC) micelles with PF block constructing the inner hydrophobic core for fluorescent tracking, PCL segment forming the hydrophobic middle shell for drug encapsulation, and POEGMA moiety building the hydrophilic outer corona for particulate stabilization. Interestingly, the CSC micelles with hydrophobic PCL middle layer show a greater drug loading capacity as well as a higher fluorescence quantum yield (Φ) relative to the core–shell micelles self-assembled from the control of PF-b-POEGMA diblock copolymers without PCL sequence due to having more hydrophobic spaces and better separation of PF sequence provided simultaneously by the PCL central block. The efficient cellular uptake of the anticancer drug doxorubicin-loaded CSC micelles together with the in vitro cytotoxicity against the HeLa cells makes the conjugated amphiphilic triblock copolymers developed herein a promising platform for simultaneous cell image and drug delivery, thus offering great potential for cancer theranostics.
研究领域:
聚合物化学
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纳米医学
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癌症研究
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Xiaofeng Wan,Xiangtai Wei,Jinming Ge,Lingfeng Lu,Ziqiang Liu,Yuanqin Zhu
High hydroxide conductivity and sufficient dimensional/alkaline/mechanical stability are highly desired for practical applications of anion exchange membranes (AEMs). Herein, a new di -quaternized side-chain precursor (EDQA) was firstly designed and synthesized. Then novel AEMs (DBTF-4QA-x) based on poly(fluorenylene alkylene)s containing dual Y-shaped side-chains were prepared from EDQA by an efficient click reaction. Benefiting from several structural advantages of EDQA, DBTF-4QA-x membranes possessed high hydroxide conductivities up to 154.8 mS cm −1 at 80 °C, while maintained high dimensional stability. The membranes exhibited robust mechanical properties with tensile strengths and elongation at break up to 107.4 MPa and 46.4%, respectively. Furthermore, the membranes showed high alkaline stability with the conductivity loss below 11.4% after immersing in 4 M aq. NaOH at 80 °C for 40 days. In addition, DBTF-4QA-0.5 membrane achieved the maximum peak power density of 836.4 mW cm −2 in H 2 /O 2 fuel cells at 60 °C.
研究领域:
材料科学
·
化学
·
能源工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Meiqi Li,Ling Li,Xinyi Zhang,Qiong Yuan,Benkai Bao,Yanli Tang
High expression of drug efflux pump makes antibiotics ineffective against bacteria, leading to drug-resistant strains and even the emergence of “superbugs”. Herein, we design and synthesize a dual functional o-nitrobenzene (NB)-modified conjugated oligo-polyfluorene vinylene (OPFV) photosensitizer, OPFV-NB, which can depress efflux pump activity and also possesses photodynamic therapy (PDT) for synergistically overcoming drug-resistant bacteria. Upon light irradiation, the OPFV-NB can produce aldehyde active groups to covalently bind outer membrane proteins, such as tolerant colicin (TolC), blocking drug efflux of bacteria. The minimum inhibitory concentration of antibiotic model chloramphenicol (CHL) is reduced about 64 times, significantly resensitizing drug-resistant bacteria to antibiotics. Also, the probe can produce highly efficient reactive oxygen species (ROS) under light irradiation. Consequently, the unimolecular OPFV-NB-based system demonstrates insusceptibility to antibiotic resistance while maintaining significant antimicrobial effects (100%) against drug-resistant bacteria. More importantly, in vivo assays corroborate that the combined system greatly accelerates wound healing by eradicating the bacterial population, dampening inflammation, and promoting angiogenesis. Overall, the OPFV-NB not only counteracts antibiotic resistance but also holds tremendous PDT efficiency, which provides a promising therapeutic strategy for combating drug-resistant bacteria and treating bacteria-infected wounds.
研究领域:
微生物学
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药理学
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治疗学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）