Materials
·
2022
·Vol. 15
·期 8
·2833
·
IF 3.748
Xiaoming Tang,Ziyi Zhou,Yuehang Jiang,Qian Wang,Qi Sun,Lei Zu,Xing Gao,Huiqin Lian,Minhua Cao,Xiuguo Cui
Ionic electroactive polymer-based actuators have attracted much attention due to their low potential stimuli. In this work, MXene–Nafion composite actuators were fabricated, and the actuation performances were tested. The morphology of the as-made MXene–Nafion composite showed that the composite membrane was homogeneous, with an MXene doping level up to 5 wt%. In addition, the results of blocked force, response speed, and durability demonstrated that the actuation behavior of the composite-based actuator was enhanced due to the efficient dispersion of the two-dimensional nanofiller MXene. In addition, the blocking force of the composite actuator with a doping level of 0.5 wt% was about 6 times that of the pure Nafion without back-relaxation and durability degradation during the testing period.Keywords:MXene;carbon nanotubes;actuation;back-relaxation;ionic electroactive
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
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
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Sheng Chang,Yimin Xuan,Jingjing Duan,Kai Zhang
Electrochemical CO 2 conversion into valuable products provides a promising solution for achieving a carbon-neutral energy cycle. Herein, an active and stable Bi/Nafion interface is fabricated over Bi nanosheets with the modification of Nafion, which exhibits superior CO 2 conversion with formate selectivity of above 95% in a wide potential range, partial current density of 72.12 mA cm −2 at − 1.07 V vs. RHE in H-type cell. The extraordinary CO 2 reduction performance could be ascribed to a high CO 2 permeability and enhanced local proton activity at the Bi/Nafion interface, which leads to promoted CO 2 adsorption and feasible proton-coupled electron transfer during the CO 2 reduction process. Computational investigations reveal the modification of Nafion offers a comfortable platform to enable the key intermediate *OCHO to be stable. This work offers a valuable insight into interfacial manipulation of electrodes to convert CO 2 to valuable products.
研究领域:
电化学
·
能源材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Shuohao Wu,Mengjun Wu,Haining Zhang,Haolin Tang
The use of gel polymer electrolytes (GPEs) is recognized as a promising strategy to improve the safety characteristics of current lithium-ion batteries (LIBs) due to the incorporation of polymer matrix and immobilization of the liquid phase. To achieve high performance and efficient Li+ transport in GPEs, the selection of polymer is critically important. Herein, a single-ion-conducting GPE with a high lithium-ion transference number is proposed with lithiated Nafion (Li-Nafion) and polyacrylonitrile (PAN) polymers. We found that the interactions between electron-withdrawing C≡N groups Li+ facilitate fast Li+ transport and reduce the Li+ migration barrier of Li+ on the −SO3– groups. As a consequence, the designed GPE shows a high lithium-ion transference number of 0.93, an admirable ionic conductivity of 1.93 × 10–4 S cm–1, and a wide electrochemical stability window up to 5.0 V at 30 °C. Further validation of the Li|LiFePO4 cell shows a decent cycling performance with an initial discharge specific capacity of 126.1 mAh g–1 and a high capacity retention of 90.1% after 200 charge/discharge cycles at 1C. This study provides a strategy of Li-Nafion and a “decoupling” polymer to enhance the GPE performance and its applications on LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
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
·
环境监测
·
化学传感器
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Yongheng Yin,Zhen Li,Xin Yang,Li Cao,Chongbin Wang,Bei Zhang,Hong Wu,Zhongyi Jiang
Design and fabrication of efficient proton transport channels within solid electrolytes is crucial and challenging to new energy-relevant devices such as proton exchange membrane fuel cells (PEMFCs). In this study, the phosphoric acid (H 3 PO 4 ) molecules are impregnated into SNW-1-type covalent organic frameworks (COFs) via vacuum assisted method. High loading of H 3 PO 4 in SNW-1 and low guest leaching rate are achieved due to the similar diameter between H 3 PO 4 and micropores in SNW-1. Then the COF-based composite membranes are fabricated for the first time with impregnated COFs (H 3 PO 4 @SNW-1) and Nafion matrix . For the composite membranes, the acid-base pairs formed between H 3 PO 4 @SNW-1 networks and Nafion optimize the interfacial interactions and hydrophilic domains. The acidic –PO 3 H 2 groups in pores of H 3 PO 4 @SNW-1 provide abundant proton transfer sites. As a result, the continuous proton transfer channels with low energy barrier are created. At the filler content of 15 wt%, the composite membrane exhibits a superior proton conductivity of 0.0604 S cm −1 at 51% relative humidity and 80 °C. At the same time, the maximum power density of single fuel cell is 60.3% higher than that of the recast Nafion membrane .
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
IONICS
·
2019
·Vol. 26
·期 3
·1347-1356
·
IF 2.289
Qu Yuning,Wen Shuya,Chen Jianhong,Shen Honghui,Yu Wenjie,Wei Dan,Yu Jianguo,Kwon Young-Uk,Zhao Yongnan
In this work, we synthesized a Pd nanonetwork (PdNN) catalyst by employing Nafion as structure-directing agent. The nanonetwork-like structure is interconnected by Pd particles. Moreover, the morphologies and the sizes of PdNN samples can be tunable by adjusting concentrations of Pd precursor. The as-prepared PdNN catalysts have superior hydrogen evolution reaction (HER) performance to that of commercial Pd/C. Among them, PdNN-4.5 catalysts exhibit the most excellent hydrogen evolution performance, which contains an overpotential of 59 mV at 10 mA cm -2 and a Tafel slope of only 54 mV dec -1 . Besides, a super stability is also displayed for PdNN-4.5 catalysts. The significant improvement in the HER performance of the PdNN-4.5 catalyst may be attributed to the nanonetwork-like structure, the sizes, and the interaction between the Pd catalysts and Nafion. Thus, this work can provide a simple method for synthesizing the highly efficient Pd-based catalyst for HER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Kai Deng,Yining Zhang,Hang Xiao,Yujiao Hou,Qingbin Xu,Ying Li,Weijun Kong,Li Ma
The ubiquitous aflatoxin B1 (AFB1) contamination in foods and other complex matrices has brought great challenges for onsite monitoring. In this study, an ultrasensitive Nafion-immobilized functionalized multiwalled carbon nanotube (MWCNT)-based electrochemical (EC) immunosensor was developed for trace AFB1 detection. The introduced Nafion film could steadily stabilize functionalized MWCNTs with uniform distribution and tiling on the surface of a Au electrode. Functionalized MWCNTs with a large specific surface area, numerous active sites to couple with abundant anti-AFB1 monoclonal antibodies (mAbs), and high conductivity served as the signal amplifier for remarkably enhancing the sensing performance of the immunosensor. In the presence of AFB1, it was specifically captured by mAbs to reduce the amplified current signals, which were recorded by differential pulse voltammetry for the accurate quantitation of AFB1. Because of the synergistic effects of Nafion on the stabilization of functionalized MWCNTs as signal enhancers, the developed EC immunosensor exhibited an extremely high selectivity, excellent sensitivity with a limit of detection as low as 0.021 ng/mL, and a wide dynamic range of 0.05–100 ng/mL, besides fascinating merits of easy construction, low cost, good stability in 7 days, and good reusability. The anti-interference ability of the immunosensor was verified against three other mycotoxins, and the practicability and accuracy were confirmed by measuring AFB1 in fortified malt, lotus seed, and hirudo samples with a satisfactory recovery of 92.08–104.62%. This novel immunosensing platform could be extended to detect more mycotoxins in complex matrices to ensure food safety.
研究领域:
食品安全
·
分析化学
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
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
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xueyi He,Guangwei He,Anqi Zhao,Fei Wang,Xunli Mao,Yongheng Yin,Li Cao,Bei Zhang,Hong Wu,Zhongyi Jiang
Nafion, as a state-of-the-art solid electrolyte for proton exchange membrane fuel cells (PEMFCs), suffers from drastic decline in proton conductivity with decreasing humidity, which significantly restricts the efficient and stable operation of the fuel cell system. In this study, the proton conductivity of Nafion at low relative humidity (RH) was remarkably enhanced by incorporating multifunctional graphene oxide (GO) nanosheets as multifunctional fillers. Through surface-initiated atom transfer radical polymerization of sulfopropyl methacrylate (SPM) and poly(ethylene glycol) methyl ether methacrylate, the copolymer-grafted GO was synthesized and incorporated into the Nafion matrix, generating efficient paths at the Nafion–GO interface for proton conduction. The Lewis basic oxygen atoms of ethylene oxide (EO) units and sulfonated acid groups of SPM monomers served as additional proton binding and release sites to facilitate the proton hopping through the membrane. Meanwhile, the hygroscopic EO units enhanced the water retention property of the composite membrane, conferring a dramatic increase in proton conductivity under low humidity. With 1 wt % filler loading, the composite membrane displayed the highest proton conductivity of 2.98 × 10–2 S cm–1 at 80 °C and 40% RH, which was 10 times higher than that of recast Nafion. Meanwhile, the Nafion composite exhibited a 135.5% increase in peak power density at 60 °C and 50% RH, indicating its great application potential in PEMFCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200769
·
IF 9.14
Yuqing Zhang,Shuyuan Xie,Dan Li,Yulong Liu,Chao Li,Jia Liu,Haiming Xie
Graphical Everyday I'm shuttling : A functional lithiated Nafion-decorated separator (Li-Nafion@PE) exhibits a good inhibition for redox shuttling in LiI-containing Li-O 2 batteries. The fabrication combines the wide universality, easy operation, and suitability for mass production. A cell with as-prepared Li-Nafion@PE exhibits considerable cycling stability and good reversibility associated with desired Li 2 O 2 generation and degradation. Although the employment of redox mediator (RM) is an effective strategy to reduce the overpotential by avoiding the direct electrochemical oxidization of Li 2 O 2 during charging, an unexpected redox shuttling in Li-O 2 system leads to RM degradation and continuous deterioration of Li anode, finally resulting in a limited cycling stability. Here, a functional lithiated Nafion-modified separator was firstly introduced to inhibit the shuttle effect by coulombic/electrostatic interactions in RM-involved Li-O 2 batteries. The fabrication of the separator involved easily accessible raw materials and an easy-to-operate process, which made it suitable for large-scale production. The enhancement of lithiated process on electrochemical properties was systematically investigated. In addition, the influence of decorated amount on cycling stability was also studied. Furthermore, the functional contribution of lithiated Nafion on inhibition of redox shuttling and the working mechanism for cells with and without as-prepared separators were proposed. This work can give an insight into the development of functional separator ( i . e ., activity issue) and the suppression of parasitic reactions ( i . e ., selectivity issue) in Li-O 2 batteries.
研究领域:
电化学
·
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）