INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Yaxiao Zhang,Chao Li,Yingchun Su,Wei Mu,Xiaojun Han
Heavy metal pollution causes serious health threat to humanbeings. Herein we fabricated a novel bismuth oxycarbide (BOC) modified glassy carbon electrode (GCE) for the simultaneous detection of cadmium and lead ions using differential pulse anodic stripping voltammetry (DPASV). The main factors influencing the detection performance, such as solution pH, deposition voltage and deposition time were optimized to be 4.5, −1.3v, and 700s, respectively. The detection limits for lead ions and cadmium ions were 4.30 μg/L and 3.97 μg/L, respectively. These detection limits are both lower than 5 μg/L for cadmium ions and 10 μg/L for lead ions national standards. The BOC modified GCE exhibits good selectivity and reliability for the detection of lead ions and cadmium ions. BOC/GCE may find great potential for heavy metal ions detection in real water sample.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jinchao Li,Jun Long,Wenheng Huang,Wenjie Xu,Jun Liu,Huan Luo,Yaping Zhang
A series of novel branched sulfonated polyimide (bSPI-x) membranes with 8% branched degree are developed for application in vanadium redox flow battery (VRFB). The sulfonation degrees of bSPI-x membranes are precisely regulated for obtaining excellent comprehensive performance. Among all bSPI-x membranes, the bSPI-50 membrane shows strong vanadium permeability resistance, which is as 8 times as that of commercial Nafion 212 membrane. At the same time, the bSPI-50 membrane has remarkable proton selectivity, which is four times as high as that of Nafion 212 membrane. The bSPI-50 membrane possesses slower self-discharge speed than Nafion 212 membrane. Furthermore, the bSPI-50 membrane achieves stable VRFB efficiencies during 200-time charge-discharge cycles at 120–180 mA cm −2 . Simultaneously, the bSPI-50 membrane exhibits excellent capacity retention compared with Nafion 212 membrane. All results imply that the bSPI-50 membrane possesses good application prospect as a promising alternative separator of VRFB.
研究领域:
材料科学
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电化学
·
能源存储
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International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 2
·1754-1772
·
IF 1.5
Zheng Chang,Zhuanzhuan Gao
In this paper, we concentrated on the simplest way to synthesize Nickel ion doped poly (neutral red) (Ni 2+ @PNR) hybrid nanocomposites (abbreviated as Ni 2+ @PNR HN) through a reverse microemulsion method. Because the MWCNTs/Nafion composite film was negatively charged, the positively charged Ni 2+ @PNR HN can be adsorbed by electrostatic interactions onto the surface of MWCNTs/Nafion modified electrode. The hybrid nanocomposite exhibited excellent electrocatalytic activity for glucose oxidation due to three-in-one synergistic effects, namely, the special copolymerization structures of Ni 2+ @PNR HN as an active catalytic center; the amount of doping of Ni2+ can be tuned by the attachment of NR with MWCNTs/Nafion, resulting in the hybrid nanocomposites containing much more Ni 2+ and possessing a significant signal amplification effect toward the glucose oxidation reaction; the effective immobilization of Ni 2+ at the modified electrode surface was achieved by the non-covalent interaction of hybrid nanocomposites and MWCNTs/Nafion support materials. Accordingly, the Ni 2+ @PNR HN/MWCNTs/Nafion modified electrode displayed an enhanced electrocatalytic activity to glucose oxidation in 0.1 mol·L -1 NaOH solution, owning the advantages of higher sensitivity, lower detection limit, wide linear range, and good stability and selectivity for constructing a novel enzyme-free glucose electrochemical sensor.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
·
IF 9.2
Dongchen Shen,Qiancan Wang,Song Li,Zhengkai Tu
Protic ionic liquids (PILs) serve as efficient proton carriers to enhance the proton conductivity of composite proton exchange membranes (PEMs). However, systematic investigations and durability evaluations of PIL-based PEMs for water electrolysis are insufficient, and their underlying microscopic mechanisms remain ambiguous. Herein, Nafion composite membranes modified with different concentrations of 1-methyl imidazolium hydrogen sulfate ([MIm][HSO 4 ]) were fabricated. The optimized 5% [MIm][HSO 4 ] membrane achieves a 12% enhancement in proton conductivity. Molecular dynamics simulations demonstrate that [MIm][HSO 4 ] induces water accumulation around sulfonic acid groups, constructing interconnected water channels and stable hydrogen-bonding networks to facilitate proton transport. The corresponding membrane electrode assembly delivers 3.8% higher electrolysis efficiency and a low degradation rate of 0.21 mV/h. Further, 96 h constant-current and 24 h dynamic load tests demonstrate the promising durability of the composite membrane.
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ACS Biomaterials Science & Engineering
·
2021
·
IF 4.749
Wei Xu,Marwan Sakran,Jianwen Fei,Xiaoyun Li,Chenyuan Weng,Wei Yang,Guomin Zhu,Wanying Zhu,Xuemin Zhou
Hydrogen peroxide (H2O2) has been reported to mediate a variety of physiological and pathological processes in living systems. In this work, a biosensor for determination of H2O2 was prepared by using an HRP/Ti3C2/Nafion film-modified glassy carbon electrode (GCE). Ti3C2 nanosheets with remarkable conductivity and high specific surface area were chosen as carriers for HRP. Moreover, this biosensor modified with HRP has a specific catalytic effect on H2O2. The difference in peak current could reflect the quantitative change of H2O2. The linear range of the biosensor is 5–8000 μM, and the detection limit is 1 μM (S/N = 3). This biosensor was used to detect H2O2 in clinical serum samples of normal controls and patients with acute myocardial infarction (AMI) before and after percutaneous coronary intervention (PCI). The results showed that the difference between normal controls and patients is significant (P < 0.05), as well as the difference for patients before and after PCI (P < 0.01), but no significant difference existed between postoperative patients and normal controls. This biosensor has the advantages of simple preparation, high sensitivity, and quick detection, showing potential application in clinical diagnosis.
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Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·196-206
·
IF 10.733
Jialin Li,Fanzhe Bu,Chunyu Ru,Hao Jiang,Yuting Duan,Yinan Sun,Xingtong Pu,Lichao Shang,Xifang Li,Chengji Zhao
Conventional fillers have limitations on the modification of proton exchange membranes because of differences in the sizes and physicochemical properties of matrix molecules. Designing skeleton molecules is a vital way to address the limitations by enabling precise distribution in the matrix and inducing automatic nanoscale aggregation and separation of hydrophilic–hydrophobic phases. In this work, a novel SDF-PAEK polymer was synthesized with a rigid hydrophobic backbone, short high-density trifluoromethyl side chains and long flexible aliphatic pendant side chains as a skeleton molecule for the Nafion membrane. Due to the unique molecular interaction selectivity during the membrane formation process, SDF-PAEK automatically matches the Nafion molecular conformation by self-assembly. Combining an improved solution formulation and membrane-casting method, the degree of composition can therefore rise to 20%, which can effectively reduce the cost. Morphological studies show that there is a certain degree of bicontinuous phase microcrystalline domains, and the proton transport channels are highly concentrated. In contrast to the Nafion membrane, SDF-PAEK@Nafion-15% exhibits better performances with higher selectivity (9.73 × 104 S s cm−3) and single-cell maximum power density (PDmax–139 mW cm−2, at 80 °C), which demonstrates the feasibility of SDF-PAEK as a novel PEM skeleton molecule for fuel cell applications.
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BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
·
2020
·Vol. 93
·期 11
·1393-1400
·
IF 4.488
Mool-am-kha Pijika,Themsirimongkon Suwaphid,Saipanya Surin,Saianand Gopalan,Tuantranont Adisorn,Karuwan Chanpen,Jakmunee Jaroon
The design and development of facile, rapid, selective, and sensitive electroanalytical methods for the simultaneous determination of serotonin (ST) along with other interfering species are in huge demand. To address this, herein, we report an efficient electrochemical sensing platform for the individual and simultaneous determination of ST and dopamine (DA) in human serum. The sensing system was judicially constructed by hybrid electrocatalytic nanocomposites composed of carbon nanotubes/nickel oxide/carbon black/Nafion modified screen-printed carbon electrode (CNT-NiO-CB/Nafion/SPCE). The structural, morphological, and electrochemical properties of the as-synthesized/fabricated materials and electrodes were thoroughly analyzed through appropriate instrumentations (scanning/transmission electron microscopy, electron microscopy, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, etc.). Besides, the experimental parameters of electrochemical measurements, such as varying amounts (CNT-NiO-CB/Nafion), pH, conditioning potential, time, modulation amplitude, and step potential, have been carefully optimized. The as-fabricated newly designed sensor exhibits superior analytical performance such as wide linear range (0.06–7.50 µM ST and 0.08–6.00 µM DA), low limit detection of (11 nM ST and 11 nM DA), high reproducibility (RSD = 5.74% ST and 7.74% DA) indicating excellent selectivity, stability, sensitivity along with good recovery range.
研究领域:
分析化学
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生物医学工程
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材料科学
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Chemosensors
·
2026
·Vol. 14
·期 4
·77
·
IF 4.4
Juan Ma,Hong Li,Siyu Huang,Xiaojing Hu,Tingjuan Xia,Dongyun Zheng
In the present study, an amperometric aflatoxin B1 sensor was constructed via modifying a nano-graphite carbon paste microelectrode with a cationic surfactant of cetyltrimethylammonium bromide (CTAB) and a perfluorosulfonic acid resin of Nafion through a simple and controllable electrochemical scanning method. The experiment results show that CTAB–Nafion composite film has a good catalytic effect on the electrochemical response of aflatoxin B1. The electrocatalytic mechanism was investigated with the aid of different analytical techniques, including square wave voltammetry, electrochemical impedance spectroscopy, chronocoulometry, energy-dispersive spectroscopy and scanning electron microscopy. Under the optimal conditions, the linear range of the sensor is from 0.1 nM to 100 nM, and its detection limit and sensitivity are 20 pM (S/N = 3) and (24.9 ± 1.51) μA/nM, respectively. The accurate and rapid detection of aflatoxin B1, which has strong carcinogenicity, is of great significance for food quality monitoring and the protection of human health. Therefore, finally, the sensor was used to detect the concentration of aflatoxin B1 in milk and soy sauce samples, and the favorable recovery results indicated its good application prospects.
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JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Xiaoyun Lin,Yongnian Ni,Serge Kokot
A new modified electrode was constructed by the electro-polymerization of 7-[(2,4-dihydroxy-5-carboxybenzene)azo]-8-hydroxyquinoline-5-sulfonic acid (DHCBAQS) at a graphene–nafion modified glassy carbon electrode (GCE). The construction process was performed stepwise and at each step the electrochemical characteristics were investigated particularly with respect to the oxidation of the three noxious analytes, 2-nitroaniline (2-NA), 3-nitroaniline (3-NA), 4-nitroaniline (4-NA); the electrode treated with the fluorescence reagent DHCBAQS performed best. At this electrode, the differential pulse voltammetry peak currents of the three isomers increased linearly with their concentrations in the range of 0.05–0.60 μg mL −1 , respectively, and their corresponding limits of detection (LODs) were all about 0.022 μg mL −1 . Furthermore, satisfactory results were obtained when this electrode was applied for the simultaneous quantitative analysis of the nitroaniline isomer mixtures by Principal component regression (PCR) and Partial least squares (PLS) as calibration methods (relative prediction error (PRE T ) – 9.04% and 9.23%) and average recoveries (101.0% and 101.7%), respectively. The above novel poly-DHCBAQS/graphene–nafion/GCE was successfully employed for the simultaneous analysis of the three noxious nitroaniline isomers in water and sewage samples.
研究领域:
分析化学
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电化学
·
环境科学
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Advanced Materials Interfaces
·
2020
·Vol. 7
·期 18
·2000342
·
IF 4.948
Fei Jin,Ke Yan,Ying Zhao,Lijuan Du,Rui Li,Jie Zheng,Ting Wang,Zhang-Qi Feng
Construction of long-range interconnected ionic channels in proton exchange membranes (PEMs) is the key to realize anisotropic proton transportation. But, how to effectively modulate ionic channels at the molecular level still remains a great challenge for modern nanoenergy technology. Here, surface enriched sulfonic acid ionic clusters in Nafion (NF)/ZnO nanofibers are successfully designed and fabricated as long-range interconnected ionic channels, in which the ZnO nanofiller (nano-ZnO) act as an inducer to enable the spatial deformation and inversion of sulfonic acid groups in NF molecule from the inside to the surface of the NF/ZnO nanofibers, due to the strong intermolecular electrostatic interactions between nano-ZnO and the CF 2 of NF backbones. The phenomenon and molecular mechanism are visually confirmed by physicochemical analysis. Ultimately, the NF/ZnO nanofibers demonstrate the relative higher of proton conductivity up to 253.2 mS cm -1 and power density of 115.72 mW cm -2 than that of reported NF-based PEMs. This study, for the first time, reveals that the surface enrichment of sulfonic acid ionic clusters is an efficient strategy to construct long-range interconnected ionic channels in the NF-based PEMs, proves that the formation of the ionic channels could be efficiently modulated by controlling the molecular activity and morphology of nanofiller.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Jing-Yi Huang,Lang Zhao,Wan Lei,Wei Wen,Yi-Jia Wang,Ting Bao,Hua-Yu Xiong,Xiu-Hua Zhang,Sheng-Fu Wang
In this work, we have developed an electrochemical aptasensor for high-sensitivity determination of carcinoembryonic antigen (CEA) based on lead ion (Pb 2+ )-dependent DNAzyme-assisted signal amplification and graphene quantum dot-ionic liquid-nafion (GQDs-IL-NF) composite film. We designed hairpin DNA containing CEA-specific aptamers and DNAzyme chains. In the presence of CEA, hairpin DNA recognized the target and performed a DNAzyme-assisted signal amplification reaction to yield a large number of single-stranded DNA. The GQDs-IL-NF composite film was immobilized on the glassy carbon electrode for the interaction with single-stranded DNA through noncovalent π-π stacking interaction. Therefore, the methylene blue-labeled substrate DNA (MB-substrate) was fixed on the electrode and exhibited an initial electrochemical signal. Under optimal conditions, the response current change was proportional to the concentration of CEA, demonstrating a wide linear range from 0.5 fg mL −1 to 0.5 ng mL −1 , with a low detection limit of 0.34 fg mL −1 . Furthermore, the proposed aptasensor was successfully applied in determining CEA in serum samples, showing its superior prospects in clinical diagnosis.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Alamgeer Khan,Hyunseo Lee,Shurouq Abdulqadir Mohammed,Muhammad Quddamah Khokhar,Hasnain Yousuf,Sangheon Park,Jaeki Jeong,Junsin Yi
Perovskite/silicon tandem photovoltaics offer a compelling pathway to surpass the efficiency limits of single-junction silicon. However, perimeter-induced recombination and shunting in n-type TOPCon bottom cells remain a critical barrier to achieving high tandem performance. Here, we present a simple and scalable Nafion-based edge-engineering approach designed to selectively passivate the damaged wafer perimeter without altering the poly-Si/SiOₓ contact. The ionomer forms a stable ionic barrier that suppresses edge-related recombination, thereby improving carrier collection in the bottom sub-cell. As a result, the Nafion-passivated n-type TOPCon cells achieved a power conversion efficiency (PCE) of 23.37%, with reduced series resistance and enhanced external quantum efficiency (EQE) across the visible and near-infrared range. Integration with a high-performance nip-structured FAPbI₃ perovskite top cell (23.62%) enables the four-terminal (4 T) tandem configuration to reach a combined PCE of 30.01% under a bifacial operation with a rear albedo of 0.3 sun. Furthermore, PVsyst simulations at the system level indicate a high-performance ratio of 0.859, highlighting substantial energy-yield potential and supporting the practical viability of this tandem architecture for large-scale deployment.
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