JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2013
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IF 2.672
Yangyang Gao,Huan Wang,Liping Guo
In this work, a glassy carbon electrode (GCE) modified with large mesoporous carbon and Nafion composites (LMC/Nafion) was constructed and used for simultaneous determination of theophylline (TP) and caffeine (CF). The electrochemical behaviors of TP and CF on the LMC/Nafion/GCE were carefully investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results show that the DPV peaks of the two analytes can be distinguished at the modified electrode with peak-to-peak separation about 150 mV, which means that LMC/Nafion/GCE is suitable for simultaneous determination of TP and CF. Under the optimized condition, the detection limits of TP and CF were 0.37 and 0.47 μM ( S / N = 3) with linear ranges of 0.8–180.0 μM and 1.3–230.0 μM, respectively. The proposed method was successfully applied to the simultaneous determination of TP and CF in human blood serum and beverages with reliable recovery.
研究领域:
分析化学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2015
·
IF 5.056
Li Sha Wang,Ao Nan Lai,Chen Xiao Lin,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
A novel type of graphene oxide (GO)/Nafion composite membrane is fabricated and used as a proton exchange membrane for direct methanol fuel cells (DMFCs) in this article. The membranes are prepared by depositing GO nanosheets on the surface of recast Nafion ® 117 via a layer-by-layer (LbL) procedure using 1, 4-phenyldiamine hydrochloride (PDHC) as the cross-linker. This approach prevents the GO nanosheets from dissolving in water and imparts the composite membranes a good stability. The methanol permeability of the composite membranes is lower than that of recast Nafion ® 117 measured under the same conditions. The composite membrane with 80-layered GO nanosheets exhibits a value of 6.7×10 −8 cm 2 s −1 at 30 °C, which is two orders of magnitude lower than that of recast Nafion ® 117. In addition, the relative selectivity of the composite membranes is 5 times higher than that of recast Nafion ® 117. The endurance time of the composite membranes in Fenton׳s reagent is 10 times longer than that of Nafion. Single cell evaluation using the composite membrane with 50-layered GO showed an open circuit voltage (OCV) of 0.67 V. A maximum power density of 64.38 mW cm −2 at a current density of 200 mA cm −2 can be achieved at 60 °C.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Scientific Reports
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2014
·Vol. 4
·期 1
·1-9
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IF 5.078
Xu Wanxing,Li Xianfeng,Cao Jingyu,Zhang Hongzhang,Zhang Huamin
In this work we presented a general strategy for the fabrication of membranes with well-defined ions transport channels through solvent-responsive layer-by-layer assembly (SR-LBL). Multilayered poly (diallyldimethylammonium chloride) (PDDA) and poly (acrylic acid) (PAA) complexes were first introduced on the inner pore wall and the surface of sulfonated poly (ether ether ketone)/poly (ether sulfone) (PES/SPEEK) nanofiltration membranes to form ions transport channels with tuned radius. This type of membranes are highly efficient for the separators of batteries especially vanadium flow batteries (VFBs): the VFBs assembled with prepared membranes exhibit an outstanding performance in a wide current density range, which is much higher than that assembled with commercial Nafion 115 membranes. This idea could inspire the development of membranes for other flow battery systems, as well as create further progress in similar areas such as fuel cells, electro-dialysis, chlor-alkali cells, water electrolysis and so on.
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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电池技术
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2019
·Vol. 30
·期 7
·1908508
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IF 15.621
Suqian Ma,Yunpeng Zhang,Yunhong Liang,Lei Ren,Wenjing Tian,Luquan Ren
As promising candidates in the field of artificial muscles, ionic-polymer–metal composites (IPMCs) still cannot simultaneously provide large deformations and fast responses, which has limited their practical applications. In this study, to overcome this issue, a Nafion-based IPMC with high-quality metal electrodes is fabricated via novel isopropanol-assisted electroless plating. The IPMC exhibits a large tip displacement (35.3 mm, 102.3°) under a low direct-current driving voltage and ultrafast response (>10 Hz) under an alternating-current (AC) voltage. Furthermore, the simultaneous integration of a large deformation and fast response can be achieved by the IPMC under a high-frequency (19 Hz) AC voltage, where the largest bending amplitude is 5.9 mm and the highest bending speed reaches 224.2 mm s −1 (596.2° s −1 ). Additionally, the lightweight IPMC exhibits a decent load capacity and can lift objects 20 times heavier. The outstanding performances of the Nafion IPMC are demonstrated by mimicking biological motions such as petal opening/closing, tendril coiling/uncoiling, and high-frequency wing flapping. This study paves the way for the fabrication of lightweight actuators with simultaneous large displacements and fast responses for promising applications in biomedical devices and bioinspired robotics.
研究领域:
材料科学
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仿生学
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生物医学工程
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2019
·Vol. 166
·期 13
·H592
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IF 3.12
Yanju Wu,Zijing Liu,Shihao Zhou,Fei Wang,Can Zhang,Kui Lu
In this work, Langmuir−Blodgett (LB) technique was proposed to assemble the homogeneous and controlled films of carboxylic multiwalled carbon nanotubes-Nafion (c-MWCNTs-Nafion). Microstructure and electrochemical performance of LB films of c-MWCNTs-Nafion were characterized by AFM, SEM and electrochemical experiments. Moreover, the LB film of c-MWCNTs-Nafion was transferred to the surface of glassy carbon (GC) electrode to fabricate the electrochemical voltametric and amperometric sensor for codeine. The fabricated sensor showed enhanced electrocatalytic behavior for the oxidation of codeine. The amperometric currents for codeine are proportional to its concentration in a range from 1.0 × 10−7 to 1.0 × 10−5 mol L−1 with a detection limit of 3.0 × 10−8 mol L−1. And the proposed method exhibited good repeatability, stability, selectivity and accuracy.
研究领域:
分析化学
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材料科学
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医学检测
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Hedong Gu,Zhiqiang Lai,Xiaofeng Wang,Weizhi Sun,Ying Rong,Fen Guo
Prussian blue analogues (PBAs), particularly nickel hexacyanoferrate (NiHCF), are promising electrode materials for aqueous sodium-ion batteries but suffer from limited calendar life due to inherent framework instability upon direct contact with aqueous electrolytes. To mitigate this degradation, we investigate the stabilization effects of a multifunctional Nafion coating—exhibiting Na⁺-selective permeability, interfacial bonding enhancement, and electrolyte isolation—applied via drop-casting to NiHCF electrodes derived from powders processed under distinct drying protocols (vacuum vs. air drying). These drying protocols induce divergent physicochemical and electrochemical properties in NiHCF electrodes, critically influencing Nafion-electrode interactions: a discrete Nafion film forms on vacuum-dried NiHCF due to reduced wettability, whereas Nafion infiltrates the porous architecture of air-dried counterparts. Experimentally, Nafion-coated electrodes demonstrate superior cycle stability (83.7 % vs. 68.0 % capacity retention after 300 cycles for coated vs. uncoated vacuum-dried samples), enhanced specific capacity, and improved rate performance. Intriguingly, while numerical simulations confirm that the Nafion coating reduces concentration polarization via selective Na⁺ transport, they fail to predict the observed gains in specific capacity or rate capability. These findings challenge the conventional wisdom that improved ionic transference numbers inherently boost electrode performance by alleviating concentration polarization, revealing instead that such benefits only emerge when concentration polarization dominates over combined ohmic and activation polarization effects.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Processes
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2020
·Vol. 8
·期 11
·1389
·
IF 2.753
Xiaojun Zhang,Man Wang,Manhong Li,Minglu Zhang,Chengwei Zhang
Nafion membrane with macropores is synthesized from silica crystal and composited with Pt nanoparticles to fabricate macroporous ionic polymer-metal composite (M-IPMC) actuator. M-IPMC shows highly dispersed small Pt nanoparticles on the porous walls of Nafion membrane. After the electromechanical performance test, M-IPMC actuator demonstrates a maximum displacement output of 19.8 mm and a maximum blocking force of 8.1 mN, far better than that of IPMC actuator without macroporous structure (9.6 mm and 2.8 mN) at low voltages (5.8–7.0 V). The good electromechanical performance can be attributed to interconnected macropores that can improve the charge transport during the actuation process and can allow the Pt nanoparticles to firmly adsorb, leading to a good electromechanical property.Keywords:nafion membrane;ionic polymer-metal composite actuator;macroporous structure;silica crystal;nanoparticles;nanocomposites
研究领域:
材料科学
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电化学
·
纳米技术
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产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
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2016
·
IF 1.947
Li-Qing Xie,Yan-Hui Zhang,Fei Gao,Quan-An Wu,Piao-Yang Xu,Shan-Shan Wang,Ning-Ning Gao,Qing-Xiang Wang
A nanocomposite of polyaniline/reduced graphene oxide (PANI-rGO) was synthesized using a hydrothermal method. The product was characterized by FT-IR, Raman spectra, XRD, SEM and TEM. Then the hybrid material of PANI-rGO and Nafion (PANI-rGO-NF) was prepared and used to modify glassy carbon electrode for the trace determination of dopamine (DA) employing differential pulse voltammetry (DPV). It was found that the hybrid material showed good catalytic activity toward the oxidation of DA, and no response to ascorbic acid (AA) and uric acid (UA) was observed, suggesting a high selectivity of the sensor toward DA. The peak currents were linearly correlated with the concentration of DA in the range from 0.05 μmol/L to 60.0 μmol/L (R = 0.996) and 60.0 μmol/L to 180.0 μmol/L (R = 0.996) with a detection limit of 0.024 μmol/L (S/N = 3). The modified electrode also exhibited excellent repeatability and stability.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2016
·Vol. 21
·期 5
·1219-1228
·
IF 2.327
Xing Ruimin,Yang Haitang,Li Shengnan,Yang Jinghe,Zhao Xiaoyu,Wang Qinglong,Liu Shanhu,Liu Xiuhua
Fabrication of multicomponent nanocomposites as electrode-modified materials is an effective strategy to design highly active electrochemical sensors. Here, we present a facile strategy to fabricate the palladium phthalocyanine-multiwalled carbon nanotube (PdPc-MWCNTs) nanocomposite for the sensitive detection of rutin. Results showed that the prepared nanocomposites exhibited excellent electrocatalytic activity toward rutin due to the synergetic effects of PdPc and MWCNTs (excellent electric conductivity and catalytic activity) and the homogeneous dispersibility of Nafion. Under the optimized conditions, the developed sensor exhibited a linear response range from 0.10 to 51 μM for rutin with a low detectable limit of 75 nM and a fast response less than 3.0 s. The proposed method might offer a possibility for electrochemical analysis of rutin in Chinese medical analysis or serum monitoring owing to its low cost, simplicity, high sensitivity, good stability, and few interferences against common coexisting ions in real samples.
研究领域:
分析化学
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材料科学
·
药物分析
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Deqian Huang,Hai Wu,Yuyang Zhu,Huijuan Su,Hong Zhang,Liangquan Sheng,Zhaodi Liu,Huajie Xu,Chongfu Song
In this paper, a graphite oxide-Nafion-glassy carbon electrode (GO-Nafion-GCE) by coating method was fabricated and used for study the electrochemical behavior and measurement of methotrexate (MTX) by cycle voltammetry (CV). The influence factors, such as volume of modifier, type of supporting electrolyte, concentration of electrolyte, scan rate, preconcentration time, and preconcentration potential on the anodic peak current of MTX were examined. The experimental results indicated that the electrode process is an adsorption-diffusion mixed controlled process. Under the experimental conditions of research, the anodic peak current of MTX shows a linear relationship within concentration range of 4.0 × 10 -7 -2.0 × 10 -5 mol L -1 . The linear relationship can be expressed with the equation of I p,a(μA) = (0.4739 ± 0.0086) C (μM) + (0.2885 ± 0.0434). Under the optimum electrochemical experimental conditions, the limit of detection (LOD) can be calculated to be 9.0 × 10 9 mol L -1 (S/N=3). The proposed method has been used for the detection of MTX in methotrexate injection and urine samples successfully.
研究领域:
分析化学
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电化学
·
药物分析
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Zhang Zhangcai,Liang Lixin,Feng Jianze,Hou Guangjin,Ren Wencai
Proton transport in nanofluidic channels is not only fundamentally important but also essential for energy applications. Although various strategies have been developed to improve the concentration of active protons in the nanochannels, it remains challenging to achieve a proton conductivity higher than that of Nafion, the benchmark for proton conductors. Here, taking H 3 Sb 3 P 2 O 14 and HSbP 2 O 8 as examples, we show that the interactions between protons and the layer frameworks in layered solid acid H n M n Z 2 O 3n+5 are substantially reduced at the monolayer limit, which significantly increases the number of active protons and consequently improves the proton conductivities by ∼ 8 ‒ 66 times depending on the humidity. The membranes assembled by monolayer H 3 Sb 3 P 2 O 14 and HSbP 2 O 8 nanosheets exhibit in-plane proton conductivities of ~ 1.02 and 1.18 S cm −1 at 100% relative humidity and 90 °C, respectively, which are over 5 times higher than the conductivity of Nafion. This work provides a general strategy for facilitating proton transport, which will have broad implications in advancing both nanofluidic research and device applications from energy storage and conversion to neuromorphic computing.
研究领域:
材料科学
·
能源
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Shihao Song,Tingting Li,Peng Zuo,Youliang Zhu,Haolong Li
Proton-exchange membrane water electrolysis (PEMWE), a key technology for green hydrogen production, is often constrained by the intrinsic trade-off between proton conductivity and hydrogen barrier properties. To ensure low H 2 crossover and safe operation, commercial PEMs such as Nafion are typically thicker than 100 μm, which increases ohmic resistance, reduces electrolysis efficiency, and raises system cost. Here we develop a bifunctional additive—polyethylene glycol-grafted polyoxometalate (PEG 500 -SiW)—that can be precisely incorporated into the ionic domains of Nafion to form hybrid membranes that concurrently enhance proton conductivity and suppress hydrogen permeation. Stabilized in the membrane via multiple noncovalent interactions, PEG 500 -SiW preserves the microphase-separated morphology of Nafion while serving two roles: it acts as a proton conductor to facilitate proton transport and provides steric hindrance to impede H 2 diffusion. As a result, the hybrid Nafion membrane achieves an electrolysis performance of 6.4 A cm −2 at 2.0 V and 80 °C, a 30.6% increase over recast Nafion (5.2 A cm −2 at 2.0 V, 80 °C). In a 500 h durability test, the voltage rise is only 4.2 μV h −1 , indicating excellent stability. At a high cathode pressure of 2 MPa, a 50 μm hybrid membrane yields a substantially reduced H 2 -in-O 2 content compared with recast Nafion and commercial Nafion 212, remaining below 2% at high current densities and meeting industrial safety standards. This work demonstrates the potential of polyoxometalates as membrane additives for PEMWE and offers a viable route to high-performance PEMs for water electrolysis.
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DOI
高影响因子
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