International Journal of Electrochemical Science
·
2023
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IF 1.5
Yating Kan,Chenhua Han,Ying Ye,Xiao Zhang,Yuanfeng Huang,Liang Xing,Yifan Zhou,Huawei Qin
An all-solid-state ammonium ion-selective electrode, with silver/nano-silver wire as the substrate, polyaniline as transducer and poly (o-phenylenediamine) as sensitive membrane, is presented. The nano-silver was prepared by electrodeposition in 0.1 M AgNO 3 standard solution with the half-sine wave at amplitude of 500 mV, frequency of 50 HZ and action time of 1 min. The polyaniline and poly (o-phenylenediamine) were electropolymerized on the surface of the silver/nano-silver substrate by cyclic voltammetry with the scanning potential from 0 to 0.45 V in solutions of 1.0 M aniline hydrochloride and 0.08 M o-phenylenediamine hydrochloride, respectively. Under the SEM, poly (o-phenylenediamine) with 0.5-5 μm in size was evenly and firmly embedded on the surface of the PANI. This ammonium electrode exhibited low impedance of approximately 70 Ohm. It can detect as low as 1.2×10 -5 M of ammonium ion, with the slopes of 54.99-55.70 mV per decade (R 2 >0.99) within a linear range between 2×10 -5 M to 0.1 M. It responds as quickly as 0.5-2 s, as well as its lifespan extends to at least 147 days. The electrode showed a superior selectivity toward NH 4 + , and was successfully applied to detect the NH 4 + concentration in real samples. In addition, this electrode is miniature and convenient for package and assembly, which will enable in-situ measurement and long-term monitoring of NH 4 + concentration in rivers, lakes and industrial sewage.
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
DESALINATION
·
2017
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IF 5.527
Mali Zhou,Xu Chen,Jiefeng Pan,Shanshan Yang,Bo Han,Lixin Xue,Jiangnan Shen,Congjie Gao,Bart Van der Bruggen
To improve the dimensional stability of electrodialysis membranes, a series of crosslinked sulphonated polysulfone cation exchange membranes with different degrees of sulfonation were prepared by a simple and low energy consumption method, namely UV-crosslinking. The crosslinking reaction was performed by UV irradiation and using 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (TPO) as photoinitiator and trimethylolpropane tri-acrylate (TMPTA) as crosslinker . The scanning electron microscopy (SEM) and atomic force microscopy (AFM) results showed that crosslinking leads to a denser and smoother surface. Compared with the swelling and water uptake results of pristine membranes , the crosslinked membranes exhibited an enhanced dimensional stability, especially at higher temperature (40–70 °C). The thermogravimetric analysis and measurement of mechanical properties indicated that the crosslinked membrane has better mechanical and thermal properties. The electrochemical properties were analyzed, and the membrane after crosslinking showed a better ion permselectivity . When applied in electrodialysis and compared to the commercial membrane with a NaCl removal ratio of 75.6%, the crosslinked membranes showed a more efficient performance (NaCl removal ratio = 89.1% for SPSU-60). These improvements showed that the crosslinked membranes can be promising candidates for high-temperature and industrial application.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ACS Nano
·
2019
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IF 13.903
Jiaman Liu,Liwei Yu,Xingke Cai,Usman Khan,Zhengyang Cai,Jingyu Xi,Bilu Liu,Feiyu Kang
Two-dimensional (2D) hexagonal boron nitride (h-BN) has attracted great interest due to its excellent chemical and thermal stability, electrical insulating property, high proton conductivity, and good flexibility. Integration of 2D h-BN into commercial proton exchange membranes (PEMs) has the potential to improve ion selectivity while maintaining the proton conductivity of PEMs simultaneously, which has been a longstanding challenge in membrane separation technology. Until now, such attempts are only limited in mechanically exfoliated small area h-BN and in proof-of-concept devices, due to the difficulty of growing and transferring large area uniform h-BN monolayers. Here, we develop a space-confined chemical vapor deposition approach and achieve the growth of wafer-scale uniform h-BN monolayer films on Cu rolls. We further develop a Nafion functional layer assisted transfer method which effectively transfers as-grown h-BN monolayer films from the Cu roll to sulfonated poly(ether ether ketone) (SPEEK) membrane. The as-fabricated Nafion/h-BN/SPEEK sandwich structure is used as the membrane and compared with the pure SPEEK membrane for flow batteries. Results show that the sandwich membrane exhibits ion selectivity 3-fold greater than that of a pure SPEEK membrane (i.e., 32.1 × 104vs 9.7 × 104 S min cm–3). In addition, we fabricate vanadium flow batteries using the Nafion/h-BN/SPEEK sandwich membrane and find that the sandwich structure does not affect the proton transport but inhibits vanadium crossover at low current density (<120 mA cm–2) due to the selective blocking of vanadium ions by 2D h-BN. As a result, the sandwich membrane exhibits a significantly improved Coulombic efficiency and energy efficiency, ∼95% and ∼91%, respectively. Our results suggest that a functional layer/2D film/target substrate-based sandwich structure shows clear potential for future 2D material-based membranes in separation technologies.
研究领域:
材料科学
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能源技术
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DOI
PubMed
高影响因子
DESALINATION
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2020
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IF 7.098
Xiaoyu Zhao,Minghui Feng,Yaoxin Jiao,Yingbing Zhang,Yanfei Wang,Zuoliang Sha
With the increasing global demand for lithium, lithium extraction from seawater/brine attracted extensive attentions. Selective lithiation desalination battery is a novel and promising model for this process since its good performances on selectivity , extraction capacity and energy consumption. However, multi-metal composition and possible corrosiveness of seawater/brine requires high capacity electrode with high selectivity and cycle stability. To address this issue, this work proposed a less layer graphene gauze modified Ni-rich cathode material LiNi 0.6 Co 0.2 Mn 0.2 O 2 core-shell structure microsphere (rGO/NCM) with shell thickness of 3 nm. The graphene gauze offers high electron transfer pathways instead of ion transfer between lattices, which reduced the NCM lattice collapse probability effectively. This was verified by ex-situ XRD and electrochemical results of high capacity, good cycle stability and rate performance in both organic and aqueous systems. In the desalination battery composed of rGO/NCM as positive and activated carbon (AC) as negative, rGO/NCM//AC delivered high Li + extraction efficiencies reaching 13.84 mg/g per 1 cycle in simulated brine by consuming only 1.4 Wh/mol Li + . The overall process produced 93% Li + in simulated brine at optimized operating conditions. The results indicated that rGO/NCM//AC desalination battery is a promising electrochemical lithium extraction approach.
研究领域:
材料科学
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电化学工程
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DOI
高影响因子
Journal of Environmental Sciences
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2020
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IF 4.302
Baoleerhu Borjigin,lixue Liu,Ling Yu,Lili Xu,Changwei Zhao,Jun Wang
A novel polyamide (PA) thin film nanocomposite (TFN) membrane modified with Beta (β) zeolite was prepared by interfacial polymerization on a poly (ether sulfone) (PES) ultrafiltration membrane. Compared with the PA thin film composite (TFC) membrane, the introduction of β zeolite with porous structure notably increased the water flux of TFN membrane. Because the β zeolite with tiny-sized and well-defined inner-porous acted as prior flow channels for water molecules and a barrier for the sulfate ions. The successful introduction of β zeolite into the (PA) selective layer and their dispersion in the corresponding layer were verified by scanning electron microscope (SEM) and atomic force microscopy (AFM). Water contact angle, zeta potential measurements were used to characterize the changes of membrane surface properties before and after incorporating the β zeolite. With the β zeolite introducing, the water contact angle of modified TFN membrane was decreased to 47.8°, which was benefited to improve the water flux. Meanwhile, the negative charges of the modified TFN membrane was increased, resulting in an enhancement of separation effect on SO 4 2− and Cl − . In term of nanofiltration (NF) experiments, the highest pure water flux of the TFN membranes reached up to 81.22 L m −2 hr −1 under operating pressure of 0.2 MPa, which was 2.5 times as much as the pristine TFC membrane.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Chenling Yao,Huan Zeng,Caiqin Wu,Di Wang,Wenbo Ma,Guilong Li,Jialing Zhou,Jian Wang
Converting the salinity gradient between seawater and river water into osmotic energy is one of the direct and effective ways to alleviate the energy crisis. High selectivity and permeability are two contradictory aspects in the design of composite membranes , and balancing the relationship between the two is the key to achieving efficient osmotic energy harvesting . Herein, a series of heterogeneous membranes consisting of UiO-66-NH 2 intercalated with poly (sodium 4-styrenesulfonate) (PSS) and anodized aluminum oxide (AAO) were designed to enhance the osmosis power generation capacity. The asymmetry of pore size, surface charge, and wettability of the composite membrane makes it behavior like a diodes-like ionic current rectification (ICR). The addition of PSS changes the ion selectivity and permeability of the composite membrane, thus enhancing the energy harvesting performance. The maximum power density of 6.32 W/m 2 is obtained under a 50-fold salinity gradient, which is 4.94 times that of the original composite membrane. This study provides a reasonable preparation strategy for functionalized MOF-based composite membranes for ion transport and efficient osmotic energy conversion.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2024
·Vol. 59
·期 34
·16129-16140
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IF 3.5
Wang Youwei,Wang Xiushan,Xu Huan,Wu Ang,Chen Ying,Li Guiqiang,Dong Chuanxin,Li Yahui,Mei Chao,Li Shuailin,Zhang Hehu
To address solubility, plasticizer leakage, and ionic carrier issues in PVC-based solid ion-selective electrodes, a novel plasticizer-free photocurable solid Ca 2+ -selective electrode (GC/PANI/CPANI/Ca 2+ (PBA)-ISE) was developed using a novel electrode structure. A new Ca 2+ -sensitive membrane based on poly(butyl acrylate) (PBA) was synthesized by ultraviolet polymerization, with conductive polyaniline (PANI) as the solid contact layer and a copolymer of aniline and 2,5-dimethoxyaniline (CPANI) as the coating. All potential electrochemical tests were carried out on the prepared Ca 2+ -selective electrode. The response slope of the electrode was 28.33 mV decade −1 , the detection limit was 6.9 × 10 −6 M, the stable linear range was 1 × 10 −6 to 1 × 10 −2 M, and it had a good Nernst response. The chronopotentiometric analysis and water layer tests showed that the potential drift of GC/PANI/CPANI/Ca 2+ (PBA)-ISE was as low as 0.0125 mV s −1 and 1.247 mV h −1 . In addition, the interference tests of environmental factors were carried out. When the electrode was in different interference light and gas environments, the potential changes of 1.6 × 10 −4 mV s −1 and 1.2 × 10 −3 mV s −1 were observed. Compared with previous reports and commercial electrodes, the prepared GC/PANI/CPANI/Ca 2+ (PBA)-ISE showed good electrochemical performance, and the recovery rate in Ca 2+ test solutions was higher (97.2–99.9%). This study provided theoretical insights to address solubility, plasticizer leakage, and ion carrier leakage issues in solid-state contact ion-selective electrodes. At the same time, this study provided a new structure and preparation method for the preparation of all-solid-state Ca 2+ -selective electrode. Graphical abstract
研究领域:
分析化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF FOOD AND DRUG ANALYSIS
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2017
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IF 3.048
Juan Miao,Xin Wang,Yunchang Fan,Jing Li,Lina Zhang,Guitao Hu,Can He,Can Jin
A mercury(II) ion-selective electrode with an ionic liquid (IL), 1-methyl-2-butylthioimidazolium bis(trifluoromethanesulphonyl)imide ([C 1 C 4 Sim]NTf 2 ) as active material was constructed. Parameters affecting the performance of the electrodes such as the dosages of the IL and carbon nanotubes and the aqueous pH values were investigated. Experimental results indicated that the optimal composition of the electrode filling material was 47.6% [C 1 C 4 Sim]NTf 2 , 47.6% tetrabutylphosphonium bis(trifluoromethanesulphonyl)imide (TBPNTf 2 ) and 4.8% carboxylic multi-walled carbon nanotubes (MWCNTs-COOH). Under the selected conditions, the proposed electrodes showed a good linear response in the concentration range of 10 −10 –10 −5 mol L −1 and had a detection limit of 4.1 × 10 −11 mol L −1 . No great interference from common metal ions was found. The proposed electrodes were applied to determine Hg 2+ in seafood samples; the results were comparable to those of the direct mercury analyzer.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Qinghan Chen,Liu-Pan Yang,Dong-Hao Li,Jingying Zhai,Wei Jiang,Xiaojiang Xie
Modern liquid membrane based ion-selective electrodes (ISEs) require selective and lipophilic ionophores. For acetylcholine (ACh), an important neurotransmitter, there is still a lack of ionophores. We propose here a family of hydrophobic macrocycle Oxatub[4]arenes as ACh selective ionophores in potentiometric ISEs, which exhibited excellent stability, selectivity, and a lower detection limit of 100±20 nM. The stability constant of the acetylcholine-ionophore complex was determined to be (5.06±0.12) ×10 5 M −1 in PVC-NOPE membranes. The ACh ISEs were used to monitor the catalytic conversion of ACh to choline by the enzyme acetylcholinesterase. The concentration of ACh in mouse brain homogenate was also successfully measured. The proposed ionophores and ISEs are highly promising for continuous monitoring of ACh concentrations in complex biological samples.
研究领域:
分析化学
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神经生物学
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DOI
高影响因子
Engineering
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2024
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IF 10.1
Zong Lu,Haoyu Wu,Yanying Wei,Haihui Wang
Transport channels with ultrahigh K + selectivity over other ions play a crucial role for living beings, but constructing ionic channels with promising K + selectivity and permeability remains a challenge. Here, an asymmetric bilayer membrane based on MXene (Ti 3 C 2 T x ) lamellar channels consisting of a recognition layer (RL) on top of an enhancement layer (EL) exhibits an amazing Matthew effect: amplification of the preferred transport of K + , resulting in an excellent K + -separation performance. The K + ion is selected by the 1-aza-18-crown-6 ether-modified RL, owing to preferential affinity energy, and then rapidly transported as a hydrated ion through the EL, based on the confinement effect. Other undesired ions such as Na + are hindered from entering the RL by the preferred K + occupation of the crown ether. The MXene (Ti 3 C 2 T x )-based Matthew membrane presents high K + -permeation rates of 0.1–0.2 mol∙m –2 ∙h –1 , with a significant K + /Na + selectivity of 5–9. The molecular separation mechanism of the Matthew membrane is investigated deeply to explore the nature of the Matthew amplification effect on K + sieving, where the precise matching of the RL and EL within the membrane governs the fast K + permeation with good selectivity. The asymmetric structure of our Matthew membrane is the key to understanding the biological function of ion channels for precise and fast ion transport, which will guide us in the creation of artificial ion channels or membranes.
研究领域:
材料科学
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生物物理学
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化学工程
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2019
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IF 5.256
Hao-Hua Deng,Xiang-Yu Fang,Kai-Yuan Huang,Shao-Bin He,Hua-Ping Peng,Xing-Hua Xia,Wei Chen
Although numerous sensors have been successfully fabricated for the detection of various heavy metal ions by employing fluorescent gold nanoclusters (AuNCs) as nanoprobes, serious cross-interference often occurs when these ions coexist in samples, which results in glaring errors in quantification. In this study, glutathione-protected AuNCs (GSH-AuNCs) were synthesized and found to respond to both Cu 2+ and Hg 2+ via fluorescence suppression. Intriguingly, addition of Ag + to GSH-AuNCs could completely inhibit the quenching effect of Hg 2+ while not affecting the Cu 2+ -mediated quenching process. Ag + can combine with Au + on the surface of AuNCs to form a strong Ag + -Au + metallic bond , which disrupts the interaction between Hg 2+ and Au + and thus eliminates the corresponding quenching effect. Based on this phenomenon, a simple sensing approach for highly selective and sensitive detection of Cu 2+ in aqueous solution was developed using the GSH-AuNC/Ag + complex as a fluorescent turn-off nanoprobe. The proposed method exhibited good linearity in the concentration range 0.02–10 μM with a limit of detection of 12 nM. This assay was demonstrated to be suitable for determination of Cu 2+ in real water samples even in the presence of Hg 2+ , showing great promise as a tool for assessment of environmental security and drinking water quality.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 46
·24510-24518
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IF 14.511
Bo Pang,Zihao Fan,Wanting Chen,Xiaoming Yan,Ruohan Du,Xiaozhou Wang,Xuemei Wu,Fujun Cui,Minggang Guo,Gaohong He
Interconnective sieving pores are fabricated by the hydrolysis of ionic clusters in precursor ion-conductive membranes to provide a versatile strategy for the proton transport-ion selectivity trade-off in vanadium flow batteries. The sulfate ester group has higher acidity than the well-formed hydrophilic ionic clusters in the precursor dense membrane and converts into smaller hydroxyl groups by subsequent hydrolysis, producing numerous angstrom-scale pores (4–8 Å) as independent H+/Vn+ ion sieving units. Meanwhile, the collapse of electrostatic interactions between the precursor sulfate ester groups and the membrane swelling during hydrolysis induced interconnection of the hydrated ionic clusters; therefore, the converted hydroxyl groups tend to disperse in the hydrophilic domains to form the interconnected collection of numerous sieving pores as broad proton conductive channels. By tuning the porous morphology by ion exchange capacity, excellent cell performance is achieved (high energy efficiency of 85.8%, low discharge capacity decay of 0.22% per cycle, and stable operation of 1000 charge–discharge cycles at 100 mA cm−2), which is better than that of Nafion 212 and most contemporary porous membranes.
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
危险品化学品经营许可证（带存储）