POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 7
·1571-1580
·
IF 2.578
Xianlin Xu,Zhufeng Shao,Lei Shi,Bowen Cheng,Xuan Yin,Xupin Zhuang,Youbo Di
Effective proton conducting sites and establishing proton channels are two critical factors in developing high-performance proton exchange membranes. This study first establishes a strategy in designing effective proton conducting channels for Nafion by using solution blowing of sulfonated polyethersulfone (SPES) nanofibers containing CC3, which is an emerging porous organic cage that possesses the advantages of dissolvable organic solvents and high proton conduction from its interconnected three-dimensional pore structure. Our strategy results in SPES nanofiber networks with CC3 uniformly involved in and composite membranes with Nafion-filled interfiber voids. Benefiting from such structural features, the composite membrane exhibits high proton conductivity (0.315 S cm −1 at 80°C and 100% RH), low methanol permeability (0.69 × 10 −7 cm 2 S −1 ), excellent water absorption, thermal and dimensional stability, and single-cell performance. This study provides not only a valuable reference for the application of CC3 but also a new idea for establishment of proton transfer channels.
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 Physical Chemistry C
·
2010
·
IF 4.224
Yuanfeng Lian,Yuexian Liu,Tao Jiang,Jing Shu,Huiqin Lian,Minhua Cao
We report for the first time the fabrication of the graphene oxide (GO)-Nafion actuators with carbon nanotubes (CNTs) as electrodes. The exfoliated GO was homogeneously dispersed in the Nafion matrix with doping level of 0.5−10 wt %. CNT electrodes on both sides of the membrane were made by dip-coating method; that is, the composites membranes were first emerged into the CNT-Nafion dimethylformamide (DMF) solution and then pulled out to dry. The as-prepared GO-Nafion actuators were tested in terms of conductivity, bulk and surface morphology, tip displacement, and blocked force. The results demonstrated that the electrochemical behavior of the polymer nanocomposite was significantly improved because of the efficient distribution of the high aspect ratio GO sheets, and the blocking force of the nanocomposite actuator with doping level 10 wt % is 4 times that of the virgin nafion, and the displacement is nearly 2 times that of nafion.
研究领域:
材料科学
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纳米技术
·
机电系统
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聚合物纳米复合材料
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致动器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Weijia Li,Yueying Zhang,Xidong Hao,Yuxi Zhang,Xinyu Yang,Xishuang Liang,Fangmeng Liu,Xu Yan,Sumei Zhang,Geyu Lu
In this paper, a Nafion-based methanol gas sensor for fuel cell vehicles is produced. The sensing electrode materials are a series of Pt-Cu alloys (the atomic ratios of Pt to Cu are 1:0, 2:1, 1:1, 1:2) supported on carbon fibers. The structure and morphology of the materials are characterized by XRD, SEM and TEM. The electrochemical properties of the materials are tested by cyclic voltammetry (CV), Amperometric i-t Curve and alternating current impedance (A.C. Impedance) measurements. When the Pt-Cu atomic ratio in the alloy is 1:1, the material agglomeration phenomenon of the material is the weakest and the electrochemical specific area (ECSA) is the largest. The sensor made by this material exhibits the best sensing performance. The device has a response of −36 μA to 500 ppm methanol and a sensitivity of 0.07 μA/ppm. This device has good resistance to CO poisoning and has been verified by DFT theoretical calculations. The sensor operates at room temperature with high selectivity and humidity resistance. Therefore, the sensor has a good application prospect for fuel cell vehicle’s methanol detection.
研究领域:
材料科学
·
电化学
·
传感器与检测技术
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能源工程
·
纳米材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Wei Jia,Beibei Tang,Peiyi Wu
It is of great necessity to achieve a proton exchange membrane (PEM) with high proton conductivity and low methanol permeability for the practical applications. Nafion modified carbon dots (NCDs) with multi-functional groups were successfully synthesized via the pyrolysis of citric acid (CA) with the existence of Nafion. The modification process is motivated by the hydrophilicity-to-hydrophobicity transformation of CA as well as the non-covalent hydrophilic-hydrophobic interaction during the pyrolysis procedure. Multi-functionalized NCDs with moderate hydrophilicity influence the aggregation structure of Nafion matrix of the composite membranes and effectively enhance the high-temperature water retention ability. Both the proton conductivity and the methanol resistance ability of the composite PEMs are significantly enhanced. 0.5-NCD-0.5 Nafion composite PEM presents a 5–10 times increase in proton conductivity and 50% percent decrease in methanol permeability than that of recast Nafion.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Qi Jin,Kaixin Zhao,Xitian Zhang
The lithium–sulfur (Li–S) battery is an appealing choice for the next-generation high-energy-density energy storage systems . However, side reactions between lithium polysulfides (LiPSs) and Li metal anode cause the growth of Li dendrites, loss of active materials, and safety issues, which severely hinders the practical application of Li–S batteries. Constructing a protection layer on the surface of Li anode is an effective strategy to shield LiPSs and regulate lithium uniform deposition in Li–S batteries. Herein, we design and fabricate a lithiated Nafion protective layer to alleviate the side reactions between LiPSs and the Li anode and guide uniform deposition of Li, in which, their mechanism is investigated. The optimal protective layer effectively protects the Li anode from the detrimental side reactions, which boosts the stability of the Li anode. Li–Li and Li-stainless steel cells with 4 M [S] Li 2 S 8 electrolyte can last for more than 400 cycles and 100 cycles at current density of 1 mA cm −2 . A Li–S full cell also exhibits a high reversible capacity of 791.5 mA h g −1 after 250 cycles at 0.5 C. This work reveals the vital role of the artificial protective layer in enhancing the stability of the Li anode in Li–S batteries.
研究领域:
电化学
·
能源材料
·
电化学储能
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电池技术
·
界面化学
✓ 已验证
DOI
高影响因子
IONICS
·
2018
·Vol. 25
·期 2
·573-581
·
IF 2.347
Zhang Chengyi,Zhang Wen,Mu Yingxin,Fang Feifei,Huang Chengde,Wang Yuxin
In this work, a novel holey graphene oxide bonded with sulfonic acid groups (S-HGO) was developed using a facile and eco-friendly strategy: erosion and oxidation of graphene oxide (GO) by H 2 O 2 and sulfonation by 4-benzenediazoniumsulfonate. The freestanding paper fabricated by S-HGO shows a high proton conductivity of 4.97 × 10 −2 S cm −1 at 60 °C and 100% relative humidity (RH), which is comparable to Nafion 115 (7.67 × 10 −2 S cm −1 ) at the same condition. The holes on S-HGO provide shortcut channels for proton transfer across the GO nanosheet. The chemical-linked sulfonic acid groups afford additional hop sites for proton conduction and endow itself an enhanced thermostability. Under 100% RH and ambient pressure, the freestanding S-HGO deliver a peak power density of 103 mW cm −2 at a load current density of 273 mA cm −2 , which is about three times more than that of GO at 35 °C. The results demonstrate that this S-HGO paper is a promising nanoscale inorganic material for proton exchange membranes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Gangqiang Tang,Yujun Ji,Chun Zhao,Dong Mei,Xin Zhao,Jie Ru,Lijie Li,Yanjie Wang
Ionic polymer metal composite (IPMC) is a kind of smart material that integrates functions of actuating and sensing. In this paper, we demonstrated a new sensing function of IPMC to detect the concentration of ethanol by investigating the effects of ethanol content on the electrical response of IPMC. Benefiting from the ion migration effect in the Nafion matrix , the voltage of IPMC varies with different ethanol concentrations . It was found that the response process of IPMC to ethanol solution can be divided into a rapid response stage caused by concentration difference and a slow response stage caused by uneven mechanical stress. The voltage change caused by the concentration difference was defined as the response voltage, and the sensitivity of the IPMC sensor to ethanol concentration was 4.39 mV. We have demonstrated the good cyclability and stability of IPMC to ethanol by experiments. Furthermore, the IPMC sensor was applied to respiratory monitoring after drinking. It has been proven that the IPMC sensor can monitor the changes in alcohol concentration after drinking, which is of great significance for the prevention of stroke after drinking.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE INTERFACES
·
2020
·
IF 2.32
Ziqian Yu,Shangzhou Liu,Qian Liang,Xiaoming Tang,Huiqin Lian,Ce Li,XiaoRui Wang,Ziyi Zhou,Yuqi Gao,Lei Zu,Yanyan Wang,Yang Liu,Yongri Liang,Yushun Jin,Xiaodong Wang,Xiuguo Cui
Ionic polymer-Carbon nanotube composite (IPCC) actuators based on black phosphorus (BP)-Nafion composite membranes were fabricated. BP-Nafion composite was used as the ionic matrix with functional carbon nanotube as electrodes. BP presents as a promising material owing to its high charge mobility using in energy storage materials. It was used in Nafion composite improving the electromechanical properties of BP-Nafion composite. Significantly the interaction between BP and lithium ion was strong which restricted the back diffusion of cation during action and thus enhanced the deformation of actuator without back-relaxation. In addition, layer crystal structure of BP protected the inter-lamellar liquid from evaporation thus ensured the durability. The result IPCC actuator exhibited improvement actuation with blocking force of 2 wt.% BP-Nafion composite of 33.6 gf g−1 for 30s under an electrical field of 2 V, 2.7 times that of neat Nafion. Actuation behavior under AC field could be repeatedly played hundreds of cycles without obvious decrease of blocking force for BP-Nafion composite-based IPCC.
✓ 已验证
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Miao Lu,Siyuan Zhang,Liang Ma,Zhongmei Song,Xiushen Ye,Huifang Zhang,Haining Liu,Zhijian Wu
The efficient removal of recalcitrant organics in high-salinity systems, specifically brine, poses a significant challenge for electrochemically advanced oxidation processes in terms of both activity and stability. Herein, a composite electrode comprising of CNT/Nafion functionalized Ti/SnO 2 -Sb/β-PbO 2 -CNT/Nafion was developed for efficient and stable removal of octadecylamine (ODA) and 4-dodecylmorpholine (DMP) in a real high-salinity environment. The degradation efficiencies of ODA and DMP on the composite electrode can reach 100 % within 60 min, respectively. The total organic carbon (TOC) removal efficiency of ODA and DMP was significantly improved to 78 % and 66 % with remarkably low energy consumption (0.414 and 1.402 kWh/g TOC), respectively. The electrochemical characterizations demonstrate that the composite electrode exhibits improved electrochemical activity (oxygen evolution potentials = 1.791 V) and electrode surface area (ECSA = 20 cm 2 ), while maintaining reduced charge transfer resistance ( R ct = 18.21 Ω/cm 2 ) and enhanced corrosion-resistant capacity (corrosion potential = 1.115 V). Based on recycling and accelerated lifespan testing, the composite electrode demonstrates exceptional stability and recyclability. Additionally revealed was the linked stability mechanism. The electrocatalytic degradation of ODA and DMP begins with the removal of amino and morpholine rings, and then the decomposition of the carbon chains. Gas chromatography-mass spectrometry (GC–MS) and theoretical calculations were used to identify intermediate products generated during the degradation of ODA and DMP, and possible degradation pathways were provided in high-salinity systems, respectively. This work offered a fresh perspective on electrocatalytic oxidation for a real high-salinity system that is more efficient and stable.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ruiyi Han,Peiyi Wu
Porous organic cage, a kind of newly emerging soluble crystalline porous material, is introduced to proton-exchange membrane by in situ crystallization. The crystallized Cage 3 with intrinsic water-meditated three-dimensional interconnected proton pathways working together with Nafion matrix generates a composite membrane with highly improved proton conductivity. Different from inorganic crystalline porous materials, like metal–organic frameworks, the organic porous material shows better compatibility with Nafion matrix due to the absence of inorganic elements. In addition, Cage 3 can absorb water up to 20.1 wt %, which effectively facilitates proton conduction under both high- and low-humidity conditions. Meanwhile, the selectivity of Nafion–Cage 3 composite membrane is also elevated upon the loading of Cage 3. The proton conductivity is evidently enhanced without obvious increased methanol permeability. At 90 °C and 95% RH, the proton conductivity of NC3-5 reaches 0.27 S·cm–1, highly improved compared to 0.08 S·cm–1 of recast Nafion under the same condition. This study offers a new strategy for modifying proton-exchange membrane with crystalline porous materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 43
·16388-16396
·
IF 8.067
Wenrui Ma,Lulu Liu,Xu Zhang,Xingfei Liu,Yi Xu,Shunbo Li,Muling Zeng
Artificial membranes with asymmetric nanopores are similar to biological membranes with ion channels. The selective and rectified ion transport property of artificial membranes is of great significance for developing electrochemical sensors with highly sensitive detection performance. Herein, we propose a fast and facile approach for the sensitive detection of metal ions or charged molecules by constructing an asymmetric nanochannel structure using a cation-selective Nafion membrane and a DNA-functionalized anodic aluminum oxide (AAO) membrane. Arising from the varying charge distributions induced by the recognition of targets by DNA probes, the Nafion/AAO heterostructured nanochannels exhibit high ionic current rectification and excellent Hg2+ regulated current responses. The present sensor with heterostructured nanochannels can realize the detection of Hg2+ with a low detection limit of 1 pM, due to the unique ionic transport property of asymmetric nanochannels and the sensitive electrochemical detection method. The sensing mechanism is also confirmed by numerical simulations, demonstrating that the differences in the rectification ratios in the heterostructured nanochannels are caused by the varying surface charge densities in AAO nanochannels. This simple and facile heterostructured sensor has the advantages of simple preparation, easy modification, simple instrumentation and high sensitivity, which possesses great potential in the detection of metal ions or charged molecules.
研究领域:
生物传感器
·
电化学检测
·
纳米技术
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）