Membranes
·
2021
·Vol. 11
·期 12
·946
·
IF 4.106
Jinchao Li,Jun Liu,Wenjie Xu,Jun Long,Wenheng Huang,Zhen He,Suqin Liu,Yaping Zhang
A sulfonated polyimide (SPI)/Nafion blend membrane composed of a designed and synthesized SPI polymer and the commercial Nafion polymer is prepared by a facile solution casting method for vanadium redox flow battery (VRFB). Similar molecular structures of both SPI and Nafion provide good compatibility and complementarity of the blend membrane. ATR-FTIR,1H-NMR, AFM, and SEM are used to gain insights on the chemical structure and morphology of the blend membrane. Fortunately, the chemical stability of the SPI/Nafion blend membrane is effectively improved compared with reported SPI-based membranes for VRFB applications. In cycling charge-discharge tests, the VRFB with the as-prepared SPI/Nafion blend membrane shows excellent battery efficiencies and operational stability. Above results indicate that the SPI/Nafion blend membrane is a promising candidate for VRFB application. This work opens up a new possibility for fabricating high-performance SPI-based blend membrane by introduction of a polymer with a similar molecular structure and special functional groups into the SPI polymer.Keywords:sulfonated polyimide;blend membrane;vanadium redox flow battery;chemical stability
研究领域:
材料科学
·
电化学
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PubMed
高影响因子
Science China-Chemistry
·
2025
·
IF 9.7
Yang Yaqiong,Lv Tian-Run,Xue Yi-Han,Yin Zhigang,Yin Ming-Jie,An Quan-Fu
Real-time monitoring of ion content variations in humans offers a noninvasive approach to ensuring health, made possible through wearable sensors. However, challenges such as the low capacitance of the solid-contact (SC) layer and the formation of a water layer hinder the low-concentration ion detection and stable performance of these sensors. To address these limitations, a novel design is proposed using graphene quantum dots (GQD)-doped polypyrrole (PPy) nano-dendritic membranes, combined with a hydrophobic Nafion membrane, for sweat ion sensors. The GQD-doped PPy membrane serves as the SC layer, where GQD enhance capacitance and the nano-dendritic structure improves ion-to-electron transduction efficiency. Meanwhile, the hydrophobic Nafion membrane prevents water layer formation, stabilizing the sensor’s performance. This design significantly improves both the sensitivity (from 49 mV/decade to 70 mV/decade) and stability (potential drift decreasing from 1.3 mV/h to 18.7 μV/h) of the sensor. Leveraging this configuration, Na + and K + sensors are integrated onto a flexible electrode using a dispense-coupled inkjet printing technique. This enables real-time, continuous monitoring of Na + and K + concentrations in human sweat simultaneously. The proposed sensing device demonstrates strong potential for noninvasive sweat monitoring, contributing to enhanced health management in daily life.
研究领域:
生物传感器
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可穿戴电子设备
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纳米技术
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生物医学工程
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健康监测
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Zhijia Xiao,Jinlong Wang,Xinyi Ke,Zihan Lu,Zhe Zhao,Yongfeng Mei,Gaoshan Huang
The incorporation of metal–organic frameworks onto conductive substrates demonstrates considerable potential in applications related to the hydrogen evolution reaction. In this work, we present a streamlined synthesis approach involving atomic layer deposition pretreatment to facilitate the controlled growth of Cu-BDC particles on a conductive Nafion film. This methodology preserves a substantial loading of Cu-BDC with a hierarchically porous structure, accompanied by a notable surface area of 547 m2 g–1. The composite is subsequently utilized as an electrocatalyst for hydrogen generation in an alkane electrolyte. The structural advances in the composite result in a superior electrochemical hydrogen production efficiency with a low overpotential of 84 mV and a low Tafel slope of 58 mV dec–1 in 1.0 M NaOH. Notably, the composite showed good cycling performance during the 18 h test with 2000 cycles. This research introduces a design of a catalyst electrode with promising implications for the hydrogen production industry.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Bowen Yang,Yangyang Long,Feng Chen,Jiabao Wang,Zhipeng Wang,Ziqiang Zhang,Yanfei Wang,Weihua Zou,Yeguang Zhang,Peng Wang,Zili Zhan,Feihu Li
Hydrogen sensor based on proton exchange membrane fuel cells (PEMFCs) was one of the most extensively studied types. However, traditional Pt/C based electrodes suffered from several drawbacks, including high cost, low catalytic efficiency for oxygen reduction reaction (ORR) and slow reaction kinetics. Herein, we developed a quasi PEMFCs hydrogen sensor utilizing MnO 2 as cathode catalyst, where the electrochemical signal was generated via the direct MnO 2 redox reaction with hydrogen, replacing the ORR process. Membrane electrode assemblies (MEAs) were successfully fabricated incorporating α-MnO 2 , β-MnO 2 , and δ-MnO 2 polymorphs. The β-MnO 2 -based sensor demonstrated best sensing performance with a maximum sensitivity of 96 nA/ppm, a 34-fold enhancement over conventional dual-platinum electrochemical sensors, under the optimized volume ratio of catalyst ink (ethylene glycol: Nafion solution: water = 1:4:4). Moreover, the β-MnO 2 -based sensor exhibited significantly superior response and recovery speed. This strategy provided an effective approach for the commercialization of next generation PEMFCs-type hydrogen sensors.
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RSC Advances
·
2026
·Vol. 16
·期 13
·12165-12179
·
IF 6.1
Waqas Saeed,Ye Tian,Irshad Ahmad Mir,Baoji Miao,Amna Manzoor,Surjyakanta Rana,Xing Chen
Ammonia (NH3) detection at room temperature under varying humidity conditions is crucial for environmental monitoring, industrial safety, and healthcare. However, ammonia detection remains a challenge due to the lack of sensitivity and selectivity of current room temperature based sensors. In this context, Ti3C2Tx MXene and flower-like SnS2 composites were investigated for NH3 sensing. A comparative analysis of multilayered and few-layered nanohybrid composites demonstrated that the few-layered configuration displayed a markedly enhanced response to ammonia. Its larger surface area, higher electrical conductivity, and higher number of active sites contribute to its superior gas diffusion and charge transfer properties. The composite was further functionalized with Nafion (NF) to enhance sensitivity and selectivity under humid conditions. In an optimized NF-functionalized few-layered Ti3C2Tx/SnS2 sensor, we achieved a 12.11 response ratio towards 100 ppm NH3, with a response time of 42 s and a recovery time of 156 s, as well as excellent selectivity towards interfering gases. Reliability tests conducted in humid environments confirmed the excellent operational stability and durability of the proposed sensor. These experimental results demonstrate that the developed few-layered Ti3C2Tx/SnS2/NF nanohybrid composite provides a highly durable, sensitive, and selective platform for NH3 detection in practical applications at room temperature.
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JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Zhongrui Lu,Zhengwei Chang,Xiaohang Li,Xiaoyang Jia,Zhuoran Yang,Zhaoyang Wang,Shaoxiong Zhai,Qing Ye,Zhanfeng Deng,Shaojian He,Jun Lin
CeO 2 is incapable of conducting protons and tends to leach from the proton exchange membrane (PEM) under the acidic conditions during fuel cell operation, consequently deteriorating both the power density and durability of the fuel cell. In this work, we prepared an acid-insoluble HPCe hybrid by combining polyethyleneimine-polydopamine (PEI-PDA) crosslinked coated CeO 2 with phosphotungstic acid, a strong proton conductor. The PEI-PDA coating not only prevents the dissolution of CeO 2 in acidic environments but also suppresses the leaching of HPW. When incorporated into Nafion, the composite membrane containing 2 wt% HPCe exhibits a proton conductivity of 0.115 S cm −1 in liquid water, which is 15% higher than that of the recast Nafion membrane (0.100 S cm −1 ), while remaining stable for 2 months. After being assembled in the fuel cell, the performance and operation stability of the composite membrane significantly outperforms the recast Nafion membrane.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Lingchu Huang,Sitong Feng,Weijia Li,Huaiyuan Sun,Jianyu Zhang,Qi Lu,Tong Wang,Xiaoyong Sun,Rui Han,Xishuang Liang,Fangmeng Liu,Peng Sun,Fengmin Liu,Bin Wu,Geyu Lu
In this work, nitrogen doped carbon fiber loaded copper (Cu/CF-N) sensing electrode and Nafion proton conductor are used to fabricate fuel cell type gas sensors that realize fast response/recovery for SO 2 detection at room temperature . This is the first time that this type of sensor has been used to detect SO 2 . We investigated the effect of Cu content on sensors’ performance, and found that the Cu (20 wt%)/CF based sensor exhibited the highest response. This can be attributed to the optimal Cu content, which exposes the most active sites. Moreover, nitrogen was doped into electrode material to further improve the performance. Nitrogen atoms enhance the conductivity of the material and its ability to adsorb SO 2 . These are confirmed by the complex impedance measurement and TPD analysis. The upgraded Cu/CF-N fuel cell type gas sensor showed a response of − 435.6 nA to 50 ppm SO 2 and a low detection limit of 500 ppb. Significantly, the Cu/CF-N sensor demonstrated short response time (44 s) and recovery time (87 s) at room temperature. Furthermore, with the advantages of no power consumption , excellent selectivity and good repeatability, the fuel cell type gas sensors have broad prospects in the field of room temperature gas detection.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2026
·
IF 4.6
Feng Zhan,Hao Luo,Shuochen Fan,Yun Qu,Qianfen Zhuang,Yong Wang
A highly sensitive and selective non-enzymatic electrochemical sensor for hydrogen peroxide (H 2 O 2 ) detection was developed based on a glassy carbon electrode modified with Nafion/copper-based metal-organic gels (NF/Cu-MOGs/GCE). The copper-based metal-organic gels featured a porous three-dimensional network hosting electroactive Cu(I)/Cu(II) redox pairs. The as-prepared NF/Cu-MOGs/GCE sensor exhibited good electrocatalytic activity toward the reduction of H 2 O 2 , achieving a wide linear range from 5 to 10,025 μM and a low detection limit of 0.28 μM (S/N = 3). The sensor also demonstrated high selectivity against common interferents, excellent reproducibility, and satisfactory stability. Its practical applicability was successfully validated by determining H 2 O 2 in milk samples, with recoveries ranging from 98.6% to 102.0%, which were in good agreement with values obtained using a reference colorimetric method. This work not only presents a robust sensing platform for H 2 O 2 monitoring, but also highlights the significant potential of MOGs as versatile functional materials in electrochemical sensing.
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DOI
高影响因子
Analytical Methods
·
2026
·
IF 3
Huili Luo,Yuhang Xiang,Senbin Qin,Xiaopeng Pan,Anxin Li,Jia Zhao,Qiang Fu,Dengting Yang
Thiamethoxam (TMX), a widely used neonicotinoid insecticide, is electrochemically detected based on the reducibility of the nitro group. However, complex electrodes and matrix interferences limit the application. Due to the response attenuation of the graphite paper electrode (GPE) toward TMX detection, Nafion solution (NF) and L-ornithine hydrochloride (LO) were adopted to improve the measurement stability of TMX and enhance the resistance to matrix interferences. After drip-coating modification, a new electron-conducting layer was formed, accompanied by a scaly film with stacked interlayer gaps of approximately 100 nm. LO acted as a bridge, which bonded with NF via a sulfonylation reaction and linked to TMX through C–O–NO2 during the electro-sorption and enrichment process. This binding to TMX corresponded to a reversible electrochemical process involving one-electron transfer. Accordingly, the analytical stability was greatly improved. The modified NF–LO/GPE also exhibited excellent anti-interference ability against extractable organic acids from celery, such as chlorogenic acid. This was mainly attributed to the negative charge repulsion of NF and acid-base neutralization under moderate alkaline activation. This work demonstrates good modifiability of NF–LO based on the sheet-like graphite electrodes and conducts a valuable exploration of matrix interference in real samples. Enhancing the adsorption capacity of the electrode surface by constructing unsaturated C–O sites may be the primary issue for the detection of organic pesticides.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Xiao-Bing Yang,Lei Zhao,Xu-Lei Sui,Ling-Hui Meng,Zhen-Bo Wang
A novel composite vanadium-blocking proton exchange membrane for vanadium redox flow battery (VRB) was designed and constructed by immobilizing phosphotungstic acid (PWA) on Nano Kevlar Fibers (NKFs) via a solution-casting method. The proton/vanadium selectivity of the composite membrane is greatly improved by incorporating the complex formed by NKFs and PWA into the Nafion matrix. Simple tuning of the complex doping quantity results in different composite membranes with superior vanadium barrier properties (namely, a minimum vanadium permeability of 2.46 × 10 -7 cm 2 min −1 ). This coupled with proton conductivities reaching 0.061 S cm −1 at room temperature indicates a proton/vanadium selectivity of 2.48 × 10 5 S min cm −3 , which is 6.3 times higher than that of recast Nafion (0.34 × 10 5 S min cm −3 ). When tested in a VRB, the performance of the single cell assembled with the composite membrane greatly outperforms that with recast Nafion at current densities ranging from 40 to 100 mA cm −2 .
研究领域:
材料科学
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电化学
·
能源技术
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Hao Guo,Tian Fan,Wenqin Yao,Wenhu Yang,Ning Wu,Hui Liu,Mingyue Wang,Wu Yang
Herein, a novel electrochemical sensor based on ZIF-67/MWCNT-COOH/Nafion composite was designed and prepared for simultaneous detection of 4-aminophenol (4-AP) and acetaminophen (AMP). The electrochemical behaviors of the 4-AP and AMP on the ZIF-67/MWCNT-COOH/Nafion electrode were explored via cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results exhibited that the designed electrochemical sensor possessed superior electrocatalytic activity for 4-AP and AMP, which was attributed to the highly ordered porous structure of ZIF-67, the outstanding electrical conductivity and high electrocatalytic activity of MWCNT-COOH. Under optimization conditions, the DPV response of the prepared electrode depicted a wider linear response concentration range of 0.2 to 200 μM for 4-AP, and 0.1 to 100 μM for AMP, respectively. And the lower detection limits (LOD) of 0.01 and 0.07 μM were obtained for 4-AP and AMP, respectively. More importantly, the acquired electrode was applied to Yellow river water and Paracetamol tablets for analysis of 4-AP and AMP, which exhibited satisfying recovery of 98.2% ~ 106.7% for 4-AP and 94.7% ~ 99.6% for AMP, respectively. In a word, the constructed electrochemical sensing platform delivered a promising potential in real application.
研究领域:
分析化学
·
环境科学
·
药物分析
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Amin Zhang,Chongchong Miao,Hongyuan Shi,Hongkun Xiang,Chusen Huang,Nengqin Jia
Recent years have witnessed the great development of electrochemiluminescence (ECL) as a platform for the analytical processes in many fields, which includes pharmaceutical analysis, immunoassay, DNA analysis as well as clinical analysis. Herein, a novel electrochemiluminescence (ECL) sensor was fabricated for ultrasensitive detection of atropine based on Ru(bpy) 3 2+ /carbon nanospheres/Nafion composite film. The carbon nanospheres (CNPs) in composite film were obtained through a hydrothermal method. Then, electrochemical and ECL behaviors of the proposed sensor were investigated. Under the optimal conditions, the constructed atropine sensor showed a wide linear range from 0.5 to 250 μM with a detection limit of 0.17 μM (at signal-to-noise ratio of 3). Moreover, the results indicated that the CNPs-based ECL sensor exhibited excellent sensitivity and favorable stability, which might be ascribed to the high surface area and the good electrical conductivity of CNPs. Furthermore, the ECL sensor was applied for the determination of atropine in atropine sulfate injection samples and displayed a desirable result. The proposed ECL sensor could be easily obtained and be promising used for drug assay.
研究领域:
分析化学
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药学
·
电化学
·
纳米技术
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DOI
高影响因子
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