CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Yingfei Hou,Lin Jiang,Yaoyao Zhang,Zhiwen Qin,Chi Jiang,Ming Wang
Lithium-air (also known as lithium-oxygen) batteries have attracted considerable global attention in recent years due to their extremely high energy density (11,140 W·h·kg −1 ). The electrolyte is a key element in lithium-air batteries and the traditional organic electrolyte has great safety risk due to leakage. On the contrary, the polymer electrolyte has the advantages of high safety, high stability and easy processing comparing with the organic liquid electrolytes. In this paper, a new idea was proposed to coat the Nafion membrane on a layer of polymer for blocking the oxidation reduction electric (RM) and Li based on the selective permeability on lithium ion of the Nafion membrane. Self-made thickness-controllable Nafion membrane, polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) and 2,2,6,6-tetramethylpiperidinooxy (TEMPO) were used to prepare a quasi solid polymer electrolyte (NSPE). Electrochemical workstation and LAND battery testing system were used to perform a galvanostatic charge/discharge test on Li-O 2 . The ionic conductivity of NSPE was 4.3 × 10 −4 S·cm −1 at room temperature and the discharge platform was 2.6 V and the charging voltage was 3.7 V after 50 cycles with the cut-off capacity of 500 mA·h·g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Small Methods
·
2019
·Vol. 3
·期 12
·1900474
·
IF 0
Yongwen Ren,Chang Yu,Xinyi Tan,Xiaotong Han,Hongling Huang,Huawei Huang,Jieshan Qiu
The electrocatalytic N 2 reduction reaction (ENRR) to ammonia has attracted much attention due to the mild operating conditions, in which the Nafion membrane is generally adopted to separate the ammonia from the anode products. However, it has been mentioned that the Nafion membrane allows ammonia to pass through and traps the ammonia to some extent, but powerful confirmation experiments and effective solutions are still lacking. Herein, it is experimentally confirmed that the use of the Nafion membrane in the ENRR is inappropriate, based on the results that the ammonia can pass through the membrane, be adsorbed on the membrane, and interact with the membrane. This causes a measurement error and accelerates the membrane degradation process, which is unfavorable for ammonia quantification and the long-term stability operation of the ENRR in practical application. Also, for the first time, a more accurate method to evaluate the activity of the ENRR electrocatalyst using a salt bridge to replace the Nafion membrane is presented.
研究领域:
化学工程
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材料科学
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电化学
✓ 已验证
产品关联
DOI
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 318
·期 3
·2307-2311
·
IF 1.181
Chen Yanliang,Zhao Chao,He Linfeng,Tang Fangdong
A method was set up to prepare reference sources for calibration of surface contamination monitors using Nafion HP membrane to fix the radioactive nuclides on aluminium backing material. By investigating the adsorption mechanism including kinetics and pH, it has been proved the 241 Am could be fixed on the membrane effectively. The surface emission rate and the activity was measured to characterize the sources. In addition, the uniformity of the sources was evaluated according to ISO 8769 and the standard deviation of the surface emission rates from each individual portion of the whole source was no greater than 5%.
研究领域:
核技术
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xinyu Yang,Yueying Zhang,Xidong Hao,Yang Song,Xishuang Liang,Fengmin Liu,Fangmeng Liu,Peng Sun,Yuan Gao,Xu Yan,Geyu Lu
In this paper, an amperometric gas sensor based on proton exchange membrane (Nafion) was fabricated for H 2 S detection at room temperature . Pt-Rh nanoparticles loaded on carbon fibers, as sensing electrode , was prepared by chemical reduction method, and membrane electrode assemble (MEA) was fabricated using hot-pressing method. X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM) were used to analyze the structure and morphology of the fabricated electrode material. The effect of the weight ratio of Pt to Rh on the performance of the sensor was investigated and the results showed that the sensing performance was best when the ratio of Pt to Rh was 1:1. Moreover, the sensitivity had been significantly improved due to the use of carbon fibers pretreated by nitric acid, increasing from 0.158 μA/ppm to 0.191 μA/ppm. The present sensor could detect H 2 S at levels as low as 0.1 ppm with a −20 nA response and had a good linear relationship in the range of 0.1 to 200 ppm H 2 S. In addition, this amperometric H 2 S sensor displayed fast response-recovery rate as well as excellent selectivity and stability.
研究领域:
材料科学
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环境监测
·
化学传感器
✓ 已验证
DOI
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
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电化学检测
·
纳米技术
·
分析化学
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
生物化学
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医学诊断
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电化学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2014
·
IF 3.511
Xiaomei Chen,Limin Zhao,Xiaotian Tian,Sai Lian,Zhiyong Huang,Xi Chen
A novel method for the determination of tetracyclines (TCs) using electrochemiluminescence (ECL) based on a Ru(bpy) 3 2+ -doped silica nanoparticles (RuSiNPs)/Nafion film modified electrode is presented in this paper. The RuSiNPs were prepared by a water-in-oil microemulsion method. The characterization results indicated that the thus-prepared RuSiNPs presented a uniform size of 45 nm and retained the original electrochemical properties of Ru(bpy) 3 2+ . Importantly, the ECL response on RuSiNPs/Nafion film modified electrode was greatly enhanced by TCs. Under the optimum conditions, the ECL intensity versus the concentration of TCs was found to be linear over the range of 1–100 μmol L −1 for tetracycline (TC), 0.1–100 μmol L −1 for oxytetracycline (OTC) and 1–100 μmol L −1 for chlortetracycline (CTC). The detection limits ( S / N =3) were 0.23 μmol L −1 for TC, 0.10 μmol L −1 for OTC and 0.16 μmol L −1 for CTC. Moreover, due to the electrostatic interaction between Ru(bpy) 3 2+ and silica matrix, the leaching of Ru(bpy) 3 2+ was greatly reduced, therefore, the ECL sensor exhibited excellent repeatability and stability in the detection of TCs. Based on these investigations, the proposed ECL approach was successfully used to analyze the TCs content in drugs.
研究领域:
分析化学
·
药物分析
·
生物传感
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Feifei Fang,Lu Liu,Luofu Min,Li Xu,Wen Zhang,Yuxin Wang
To increase the conductivity of proton exchange membranes in the membrane thickness direction, a novel mixed matrix membrane of Nafion ionomer and sulfonated graphene nanoplates (sGNP) with aligned proton channels is prepared with the assistance of an electric field. A high voltage alternative electric field is applied to a casting solution consisting of Nafion ionomer , sGNP, N, N-dimethylformamide (DMF), and p-xylene (PX) while evaporating the solvents. The sGNP, naturally attracting the ionic groups of Nafion ionomer to their vicinity, is polarized and rotated under the electric field, leaving aligned proton channels in the solidified membrane. The trans-plane proton conductivity of the mixed matrix membrane can reach 0.155 S cm −1 at 80 °C and 100% RH, an increase of 48% as compared with the conventional cast Nafion membrane . Accordingly, the peak power output of H 2 /O 2 fuel cell with the mixed matrix membrane increases by 15%, reaching 440 mW cm −2 at 80 °C.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yehui Guan,Mingjun Dai,Tong Liu,Yingwei Liu,Fangmeng Liu,Xishuang Liang,Hui Suo,Peng Sun,Geyu Lu
A fuel-cell-type gas sensor based on the membrane electrode assemble (MEA) composed of proton exchange membrane (Nafion) and Pt/C sensing electrodes was fabricated for detection of CO at room temperature . The Pt/C electrodes materials were synthesized from Vulcan XC-72 carbon powders and hexachloroplatinic acid (H 2 PtCl 6 ). This paper mainly focused on the effect of various dispersants (ethylene glycol (EG) tetraethyl orthosilicate (TEOS), glycerol and EG/polytetrafluoro-ethylene (PTFE)) on the performance of the presented sensor. Results revealed that the sensor utilizing EG as the dispersant elicited the highest response current toward 50 ppm CO. The current of the sensor was linearly correlated with CO concentration in the range of 1–200 ppm, which sensitivity was 88 nA/ppm. In addition, the 90% response and recovery times of the sensor toward 50 ppm CO were 22 and 24 s, respectively. Besides, the prepared CO sensor also had a good repeatability and acceptable selectivity.
研究领域:
材料科学
·
传感器技术
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Hang Wang,Xiaojie Li,Xupin Zhuang,Bowen Cheng,Wei Wang,Weimin Kang,Lei Shi,Hongjun Li
Proton currents are an integral part of the most important energy-converting structures in biology. We prepared a new type of bioinspired Nafion (Bio-Nafion) membrane composited of biofunctional SiO 2 (Bio-SiO 2 ) nanofiber and Nafion matrix . SiO 2 nanofibers were prepared by electrospinning silica sol prepared from tetraethyl orthosilicate . Meanwhile, Bio-SiO 2 nanofibers were synthesized by immobilizing amino acids (cysteine, serine , lysine, and glycine) on SiO 2 nanofibers, which acted as efficient proton-conducting pathways that involved numerous H + transport sites. In our study, the SiO 2 nanofibers biofunctionalized with cysteine were further oxidized, and the composite membranes were designated as Nafion-Cys, Nafion-Lys, Nafion-Ser, and Nafion-Gly, respectively. We then investigated the different polar groups ( SO 3 H, OH, and NH 2 ) of the amino acids that contributed to membrane properties of thermal stability, water uptake (WU), dimensional stability, proton conductivity , and methanol permeability . Nafion-Cys exhibited the highest proton conductivity of 0.2424 S/cm (80 °C). Nafion-Gly showed the lowest proton conductivity and WU because glycine contains the least number of hydrophilic groups among the amino acids. Overall, the introduction of Bio-SiO 2 nanofiber to composite membranes significantly improved proton conductivity, dimensional stability, and methanol permeability.
研究领域:
材料科学
·
能源科学
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Hao Lu,Tanji Yin,Feng Luan,Yanhong Li,Wei Qin
Surfactants are a type of amphiphilic chemicals that comprise both hydrophilic and hydrophobic regions, and the presence of surfactants would bring a detrimental effect on the potential responses of the solid-contact ion-selective electrodes induced by their extraction from the aqueous solution into the polymeric membrane phase. Herein, an anti-surfactant solid-contact Ca 2+ -selective electrode is proposed based on tailoring the surface of the polymeric membrane with the thin-layer Nafion membrane. The extraction of surfactants into the polymeric membrane can be eliminated through using the hydrophobic group of Nafion acting as “a polymer brush”, while the Ca 2+ diffusion from the aqueous solution to the membrane phase is promoted by the hydrophilic group of Nafion based on the electrostatic interaction. The Nafion-functionalized solid-contact Ca 2+ -ISE shows an improved potential stability and an excellent potentiometric performance for detection of Ca 2+ in the presence of cationic and anionic surfactants as compared to the traditional solid-contact Ca 2+ -ISE. Moreover, the anti-surfactant solid-contact ion-selective electrode is feasible for in situ measurement of Ca 2+ at the interface between the seawater and the sediment. This work provides a general and facile strategy to eliminate the interferences of surfactants during the potentiometric measurements, and is favorable for in situ, on-site measurement with high accuracy and precision in the aquatic environment.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）