ACS Applied Polymer Materials
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2025
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IF 4.7
Dong Xu,Quankang Sheng,Ao Chen,Long Chen,Yu Zhang,Chao Zhu,Jian Chen,Shaoyun Chen,Chenglong Hu
Conductive polymers have great potential applications as electrode materials for supercapacitors in small energy storage devices. First, manganese sulfate (MnSO4) was oxidized to manganese dioxide (MnO2) microspheres with a diameter of 1.5–3.5 μm by catalysis of Ag+. Subsequently, polyaniline (PANI) grew in situ on the surface of MnO2 by the dilute solution method, using MnO2 as a self-degraded template in an acidic environment. The MnO2 was gradually reduced to Mn2+ because MnO2 acted as both an oxidant and a template for the polymerization of aniline, resulting in the formation of PANI microspheres with a hollow urchin-like structure. The as-prepared PANI, with its high specific surface area and porous properties, was considered a potential material for surface–interface chemical energy storage. Therefore, the specific capacitance of the hollow urchin-like PANI electrode could reach 531 ± 35 F/g at 5 mV/s, and the loss of specific capacitance was 41.0% when the current density increased from 1 to 10 A/g. Further analysis of the charge storage mechanism of the hollow urchin-like PANI electrode revealed that the electrode was controlled by slow kinetics, indicating that the electrode reaction was mainly controlled by the Faradaic intercalation process inside the active material. A symmetric supercapacitor device was also assembled using hollow urchin-like PANI microsphere electrodes, and the maximum energy density was about 17.92 Wh/kg at a power density of 500 W/kg.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Guangli Li,Yafeng Zhang,Yonghui Xia,Tianyu Wang,Yuan Jin
Excessive consumption of Sunset Yellow (SY) and Tartrazine (Tz) might cause adverse effects on human health. Hence, it is essential to develop a rapid and reliable technique for simultaneous determination of SY and Tz. Herein, an innovative voltammetric sensor was constructed for simultaneous determination of SY and Tz using multiwalled carbon nanotubes decorated dandelion-like α-MnO 2 microspheres (MnO 2 /MWCNTs). The physiochemical properties of MnO 2 /MWCNTs were studied by various microscopic, spectroscopic, and electrochemical techniques. Various parameters, including accumulation time, accumulation potential, loading volume, buffer pH, and scanning rate, were systematically explored in order to pursuit the higher peak current response. The MnO 2 /MWCNT effectively enlarged the electroactive surface area and expedited the electron transfer. As a result, the MnO 2 /MWCNT decorated glassy carbon electrode (GCE) displayed superior sensing performance for the electrooxidation of SY and Tz over a wide concentration range (0.06–10 μM), owing to the synergistic effect from dandelion-like α-MnO 2 microspheres and highly conductive MWCNTs. The detection limits were 0.005 and 0.01 μM for SY and Tz, respectively. In addition, the MnO 2 /MWCNT/GCE demonstrated strong anti-interfering capacity against potential interfering species, and highly reproducible electrode manufacture. The MnO 2 /MWCNT/GCE was successfully employed for the simultaneous and sensitive determination of SY and Tz in carbonate beverage with good recovery.
研究领域:
分析化学
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食品科学
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材料科学
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DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 42
·5472-5477
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IF 2.378
Linjie Wang,Kun Ye,Jianming Pan,Hongwei Song,Xin Li,Xiangheng Niu
As a typical biomarker for disease diagnosis in clinical practice, alkaline phosphatase (ALP) plays a critical role in regulating the dephosphorylation process of biomolecules. On this account, exploration of an effective and simple means of ALP activity measurement becomes very significant. In this work, we report a catalytic reaction-based colorimetric method for the monitoring of ALP activity via employing nanostructured MnO2 as a favorable oxidase mimic. The prepared MnO2 microspheres exhibit good oxidase-like capacity to induce the catalytic oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to deep-blue TMBox; when ALP hydrolyzes ascorbic acid phosphate, the produced ascorbic acid (AA) with a certain reducing power can destroy the MnO2 enzyme mimic by reducing it to Mn2+, dramatically suppressing the TMB chromogenic reaction. Based on the strategy, a convenient and high-performance colorimetric method was established for ALP activity sensing, giving a wide linear range from 0.5 to 120 U L−1. With the help of N-ethylmaleimide as an efficient masking agent for biothiols, the colorimetric approach could provide excellent specificity for ALP activity detection. Reliable and precise measurement of the analyte in practical samples was also verified by our assay, indicating its promise as a feasible tool for clinical diagnosis.
研究领域:
生物化学
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医学诊断
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纳米材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Hengjia Zhu,Peng Liu,Lizhang Xu,Mengzhu Wang,Jianming Pan,Xiangheng Niu
Due to their great threat to human health and the environment, it is always of significance to develop efficient tools to monitor pesticide residues. Although the enzyme inhibition-based strategy is considered as a potential method and has been intensively explored for pesticide analysis, both vulnerable enzymatic activity and tedious operation greatly hinder its practical applications. Developing robust, easy-to-use and efficient devices for pesticide sensing is still challenging. Herein, we recommend an enzyme-nanozyme integrated hierarchically porous hydrogel (AChE-MnO 2 @HPH) for the convenient detection of pesticides. MnO 2 microspheres were first employed as an emulsion stabilizer to fabricate MnO 2 @HPH by thermal polymerization, and AChE was then immobilized into the MnO 2 @HPH via a fast self-absorption process. With the unique porous structure and hydrophilic microenvironment, the constructed AChE-MnO 2 @HPH exhibited excellent enzymatic activity and stability as well as rapid response toward pesticides through inhibiting the activity of AChE. By applying a smartphone to read the color information originating from the chromogenic reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) catalyzed by oxidase-mimicking MnO 2 , highly sensitive and convenient determination of fenthion, an organophosphorus pesticide model, was achieved with a detection limit down to 0.63 ng mL −1 . Excellent performance robustness over 30 storage days and reliable detection of the target in real food samples were also demonstrated. With the advantages of easy operability, free of equipment, and good detection performance and long-term stability, the integrated AChE-MnO 2 @HPH will find promising use for pesticide residue in-field analysis.
研究领域:
生物化学
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环境科学
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材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
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2021
·Vol. 188
·期 10
·1-10
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IF 5.833
Xu Shengrui,Dong Panlong,Qin Ming,Liu Hailin,Long Anying,Chen Changpo,Feng Suling,Wu Hongjing
Core-shell structured Fe 2 O 3 /CeO 2 @MnO 2 microspheres were fabricated and used as solid-phase microextraction coating for determination of polycyclic aromatic hydrocarbons (PAHs) in water samples. XPS spectra demonstrated the generation of abundant surface oxygen on Fe 2 O 3 /CeO 2 @MnO 2 microspheres, which provided binding sites for enhancement of analyte extraction. Under optimized conditions, the proposed method presented good linearity in the concentration range 0.04–100 ng mL −1 , with low limits of detection varying from 0.38 to 3.57 ng L −1 for eight PAHs. Relative standard deviations for a single fiber and five batches of fibers were in the ranges of 4.1–8.2% and 7.1–11.4%, respectively. The proposed method was successfully used for determination of PAHs in real river water samples with recoveries ranging from 87.1 to 115.9%. The proposed method using as-prepared Fe 2 O 3 /CeO 2 @MnO 2 microspheres as SPME coating exhibit significant potential for real sample analysis due to its excellent reproducibility, high sensitivity, and good linearity. Graphical abstract
研究领域:
环境科学
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分析化学
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材料科学
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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）