JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2020
·Vol. 51
·期 2
·295-306
·
IF 2.384
Liu Qian,Zhang Binyan,Du Shilong,Li Lin,Liu Fuxin,Fan Weizhou,Liu Xiuhui
Abstract Excessive uptake of nitrite will damage the human health. Hence, there is a rising requirement to construction a highly sensitive electrochemical sensor for detecting the level of nitrite in food precisely. In this work, an electrochemical nitrite sensor was successfully constructed with the porous hollow carbon nanoparticles as the electrode material. The morphology and structure of the synthesized material were characterized by scanning electron microscopy, transmission electron microscope, Brunauer–Emmett–Teller, and Fourier transform infrared spectroscopy. Meanwhile, the electrochemical behavior of nitrite was studied by cyclic voltammetry and amperometry ( i − t ). As a result, the as-constructed sensor exhibited high electrocatalytic activity, high sensitivity (275.7 µA mM −1 cm −2 ), wider linear range (0.037–6950 μM), and lower limit of detection (10.41 nM) toward nitrite oxidation. Finally, the sensor was successfully applied to the detection of nitrite in pickle directly, indicating its feasibility for practical applications. The results showed that the porous hollow carbon nanospheres hold great prospect in sensitive detection of nitrite. Graphic abstract
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PLoS One
·
2020
·Vol. 15
·期 10
·e0240173
·
IF 2.74
Lei Zhang,Zhengying Wei,Pengcheng Liu
To improve the single-layer all-solid-state ion selective electrode’ defects including poor conductivity of PVC sensitive membrane and interference of water layer between substrate electrode and sensitive membrane, a double-layer all-solid-state ion selective electrode with nanomaterial as the solid contact layer and conductive polymer as the ion sensitive membrane was developed. A gold nanoparticles solid contact layer and a nitrate-doped polypyrrole molecularly imprinted polymer membrane were prepared by electrodeposition. The optimal parameters obtained by electrochemical performance test were 2.5 mmol/L HAuCl 4 electrolyte for solid contact layer and 1800s electrodeposition time for sensitive membrane. The new electrode exhibited a Nernstian response of -50.4 mV/decade and a low detection limit of 5.25×10 -5 mol/L. Potentiometric water layer test showed no water film formed between the gold nanoparticles solid contact layer and nitrate-doped polypyrrole molecularly imprinted polymer membrane. The contact angle between droplet and the surface of solid contact layer was 112.35° and showed good hydrophobic property. Furthermore, the developed electrode exhibited fast response, excellent potential stability and long lifetime. This electrode is suitable for the detection of nitrate concentration in water and liquid fertilizer.
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CELLULOSE
·
2020
·Vol. 27
·期 16
·9457-9466
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IF 4.21
Hou Minjie,Hu Yumeng,Xu Miaojun,Li Bin
A novel conductive film with a sandwich structure was successfully prepared from nanofibrillated cellulose (NFC) and carbon nanotubes (CNTs). This film possessed an anisotropic electrical conductivity, and its electrical conductivity and mechanical strength were significantly enhanced. The electrical conductivity of the film was as high as 90.8 S cm −1 and the tensile strength was 60.8 MPa when the CNT loading amount was 19.2 wt%. Based on this unique structure, this flexible conductive film was used to prepare an all-in-one integrated film supercapacitor (IFSC) though a simple electrodeposition method. After the liquid electrolyte penetrated into the composite film, the flexible IFSC possessed a high volumetric capacitance of 11.25 F cm −3 and retained stable electrochemical performance under different bending states. Therefore, we believed that the flexible and simply designed NFC based film was a promising candidate for the application in wearable bio-electronics.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Jian Zhang,Shiyu Liu,Hao Wang,Qibin Xia,Xiaoxi Huang
The application of electrochemical water splitting process in acidic medium is restricted by the lack of highly efficient and stable oxygen evolution reaction (OER) electrocatalyst . In this work, we report a facile soft template method to synthesize nanosized iridium oxide for electrocatalytic OER in acidic medium. The fabrication process involves thermal treatment of iridium complex and polypyrrole in air. The compositions and structures of the resulting catalytic materials are significantly influenced by the annealing temperature. The nanostructured iridium oxide synthesized at optimal 450 °C exhibits low overpotential (291.3 ± 6 mV) to reach 10 mA/cm 2 current density towards OER, which is better than the commercial iridium oxide. Further investigation indicates that nanosized iridium oxide synthesized at 450 °C has high electrochemical active surface area to expose abundant accessible active sites, which can accelerate the OER rate. This method can also provide new guidance to prepare other metal oxide nanoparticles for various applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Lijie Zhong,Xuan Jiang,Runqiu Zhang,Jiahui Shao,Lina Chi,Yalin Wang,Jinping Jia,Diwen Ying
Mixed salt from the concentrated brine that contains NaCl and Na 2 SO 4 has been classified as hazardous waste since 2016 in China. This fact created an urgent and tremendous demand to treat these brine promptly. In this paper, we reported a method of using selectrodialysis with the bipolar membrane (BMSED) to reutilize the concentrated brine to produce high-purity HCl, NaOH, and Na 2 SO 4 , which fulfilled the demand above. The selective PPy(Cl) composite membrane, which was able to separate NaCl and Na 2 SO 4 in the concentrated brine, was prepared. The 3.5 μm PPy(Cl) film significantly enhanced the selectivity of the anion exchange membrane (AEM) to chloride ions while sulfate ions were blocked. The BMSED stack with our multilayer PPy(Cl) composite AEM produced 1.23 mol/L HCl with a purity higher than 98.2%. More importantly, the prepared PPy(Cl) composite AEM was not only suitable for brine with a high Cl − /SO 4 2− of 19:1, which was the typical ratio in concentrated brine from the coal chemical industry, but also able to treat the brine with a Cl − /SO 4 2− as low as 1:1, showing superior capability. The effluent of the BMSED we developed, which contained 0.02 mol/L Na 2 SO 4 with the Cl − /SO 4 2− equaling to 1:1, could be further concentrated by reverse osmosis for sea water (RO-SW) and freeze crystallization to obtain Na 2 SO 4 with a high purity accordingly. This reutilization route of concentrated brine was very green because it not only produced no hazardous waste, but also recycled valuable products. Therefore, it was believed a promising application in the coal chemical industry.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 27
·7515-7524
·
IF 3.637
Zhang Yang,Wang Yuedan,Qing Xing,Wang Yao,Zhong Weibing,Wang Wenwen,Chen Yuanli,Liu Qiongzhen,Li Mufang,Wang Dong
Multi-walled carbon nanotubes (MWCNT) play a synergistic role with conducting polymer in practical applications such as biological sensing. In this paper, multi-walled carbon nanotube and polypyrrole (PPy) composites were prepared on a fiber surface for the first time, and their morphology and electrical properties were characterized. Compared with PPy-coated fiber, the presence of carbon nanotubes induced the growth of large areas of PPy nanowires. In addition, fiber organic electrochemical transistors (FECTs) based on PPy and MWCNT were assembled, showing a higher on/off ratio, better stability, and greater flexibility. The lactate biosensor based on FECTs exhibits high sensitivity, with a correlation coefficient of R = 0.9889, quick response time of 0.6–0.8 s, a wide linear response range of 1 nM–1 mM, and excellent selectivity for lactate. Furthermore, the lactate concentration in human sweat was successfully detected by a FECT-based sensor. The hybrid fibers can be easily woven and placed on fabric simply by stitching. This favorable performance of the FECT-based sensor makes it suitable for noninvasive sensing of lactate. Therefore, it provides a promising platform for future use in healthcare and detection applications.
Graphical abstract
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Jie Du,Yide Xia,Faqiong Zhao,Baizhao Zeng
A stable gold nanoparticles (AuNPs) and barium coordination polymer (BaCP) doped polypyrrole (Ppy) solid phase microextraction coating was prepared by electrodeposition. It was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetry. The obtained coating exhibited broccoli-shape with many particles attached on it, and it could bear 300 °C. Five nitropolycyclic aromatic hydrocarbons (NPAHs) were selected as models to test its extraction property. Due to the π-π, metal ion-π interaction, hydrogen bonding and hydrophobic interaction between the target analytes and the coating, high extraction efficiency was observed. Under the selected conditions, by coupling with GC-FID detection limits of 0.92 ~ 4.16 ng/L (S/N = 3) and linear ranges of 10 ~ 3500 ng/L were achieved. The relative standard deviation for different coatings was 4.20 ~ 10.2%, and the relative standard deviation for the same coatings was 2.86 ~ 5.70%. The detection of the five NPAHs in water samples was successfully performed by using this method and the recoveries ranged from 80.3% to 115.6%.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Shan Yuan,Lili Cui,Xingquan He,Wei Zhang,Tewodros Asefa
Developing highly active, stable and sustainable electrocatalysts for overall water splitting is of great importance to generate renewable H 2 for fuel cells. Herein, we report the synthesis of electrocatalytically active, nickel foam-supported, spherical core-shell Fe-poly(tetraphenylporphyrin)/Ni-poly(tetraphenylporphyrin) microparticles (FeTPP@NiTPP/NF). We also show that FeTPP@NiTPP/NF exhibits efficient bifunctional electrocatalytic properties toward both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). Electrochemical tests in KOH solution (1 M) reveal that FeTPP@NiTPP/NF electrocatalyzes the OER with 100 mA cm −2 at an overpotential of 302 mV and the HER with 10 mA cm −2 at an overpotential of 170 mV. Notably also, its catalytic performance for OER is better than that of RuO 2 , the benchmark OER catalyst. Although its catalytic activity for HER is slightly lower than that of Pt/C (the benchmark HER electrocatalyst), it shows greater stability than the latter during the reaction. The material also exhibits electrocatalytic activity for overall water splitting reaction at a current density of 10 mA cm −2 with a cell voltage of 1.58 V, along with a good recovery property. Additionally, the work demonstrates a new synthetic strategy to an efficient, noble metal-free-coordinated covalent organic framework (COF)-based, bifunctional electrocatalyst for water splitting.
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CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
Zhifeng Dai,Yongquan Tang,Fei Zhang,Yubing Xiong,Sai Wang,Qi Sun,Liang Wang,Xiangju Meng,Leihong Zhao,Feng-Shou Xiao
The transformation of CO 2 into cyclic carbonates via atom-economical cycloadditions with epoxides has recently attracted tremendous attention. On one hand, though many heterogeneous catalysts have been developed for this reaction, they typically suffer from disadvantages such as the need for severe reaction conditions, catalyst loss, and large amounts of soluble co-catalysts. On the other hand, the development of heterogeneous catalysts featuring multiple and cooperative active sites, remains challenging and desirable. In this study, we prepared a series of porous organic catalysts (POP-PBnCl-TPPMg- x ) via the copolymerization metal-porphyrin compounds and phosphonium salt monomers in various ratios. The resulting materials contain both Lewis-acidic and Lewis-basic active sites. The molecular-level combination of these sites in the same polymer allows these active sites to work synergistically, giving rise to excellent performance in the cycloaddition reaction of CO 2 with epoxides, under mild conditions (40 °C and 1 atm CO 2 ) in the absence of soluble co-catalysts. POP-PBnCl-TPPMg-12 can also efficiently fixate CO 2 under low-CO 2 -concentration (15% v / v N 2 ) conditions representative of typical CO 2 compositions in industrial exhaust gases. More importantly, this catalyst shows excellent recyclability and can easily be separated and reused at least five times while maintaining its activity. In view of their heterogeneous nature and excellent catalytic performance, the obtained catalysts are promising candidates for the transformation of industrially generated CO 2 into high value-added chemicals.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 69
·16392-16401
·
IF 4.857
Chenxia Kang,Ju Fang,Likang Fu,Shuxian Li,Qiming Liu
Graphical Supercapacitive nanoarchitectures : A rationally designed 3D hierarchical carbon cloth/nitrogen-doped carbon nanowires/Ni@MnO 2 (CC/N-CNWs/Ni@MnO 2 ) nanocomposite was prepared by electrodeposition and used as a supercapacitor cathode exhibiting high surface area, outstanding electrical conductivity, and excellent performance in supercapacitors. A 3D hierarchical carbon cloth/nitrogen-doped carbon nanowires/Ni@MnO 2 (CC/N-CNWs/Ni@MnO 2 ) nanocomposite electrode was rationally designed and prepared by electrodeposition. The N-CNWs derived from polypyrrole (PPy) nanowires on the carbon cloth have an open framework structure, which greatly increases the contact area between the electrode and electrolyte and provides short diffusion paths. The incorporation of the Ni layer between the N-CNWs and MnO 2 is beneficial for significantly enhancing the electrical conductivity and boosting fast charge transfer as well as improving the charge-collection capacity. Thus, the as-prepared 3D hierarchical CC/N-CNWs/Ni@MnO 2 electrode exhibits a higher specific capacitance of 571.4 F g −1 compared with those of CC/N-CNWs@MnO 2 (311 F g −1 ), CC/Ni@MnO 2 (196.6 F g −1 ), and CC@MnO 2 (186.1 F g −1 ) at 1 A g −1 and remarkable rate capability (367.5 F g −1 at 10 A g −1 ). Moreover, asymmetric supercapacitors constructed with CC/N-CNWs/Ni@MnO 2 as cathode material and activated carbon as anode material deliver an impressive energy density of 36.4 W h kg −1 at a power density of 900 W kg −1 and a good cycling life (72.8 % capacitance retention after 3500 cycles). This study paves a low-cost and simple way to design a hierarchical nanocomposite electrode with large surface area and superior electrical conductivity, which has wide application prospects in high-performance supercapacitors.
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PROGRESS IN ORGANIC COATINGS
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2020
·
IF 4.469
Qian Gao,Min Lei,Kemeng Zhou,Xinliang Liu,Shuangfei Wang,Huimin Li
The objective of this research was to develop an effective and complete green approach for the production of composite films with enhanced antioxidant and antibacterial properties and oxygen barrier properties. This was accomplished by incorporating chitosan (CS) and polypyrrole (PPy) to microfibrillated by coasting method prepare MFC/CS/PPy film. The contact angle was used to evaluate poor water resistance, which increased from 94.1° to 122°. The contact angle of the composite film was further increased to 122° due to the chemical polymerization of pyrrole produces a layer of PPy nanoparticles on the surface of the MFC/CS composite film. The CS and PPy improved the uniformity of the surface and filled the pores, indicating that the channel has been blocked, resulting in significant reduction in oxygen transmission (32.38 cm 3 (m −2 ·day −1 ). The MFC/CS/PPy film showed bactericidal activity against Escherichia coli (5.43 log CFU mL −1 reduction) The synergistic effect of proton amino (in acidic medium) in CS with the positively charged PPy chain improves the antimicrobial performance of MFC/CS/PPy. The positive charges Ions may attach to the negatively charged bacterial cell wall, thus destroying the cell wall and eventually killing the bacteria. The composite films have good thermal stability. The ability of MFC/CS/PPy composite membrane to inhibit 2,2-diphenyl-1-picrylhydrazyl assay (DPPH) activity increases to 54 %. This property depends on the increased activity of the hydrogen atoms. Considering a series of current properties, MFC/CS/PPy composite film was successfully used in the active packing of fresh cherry tomatoes (10 days), effectively extending shelf life. Therefore, MFC/CS/PPy composite film has the potential to be used as biodegradable packaging materials for fresh fruits.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Fang Liu,Weidong Liang,Chengjun Wang,Jingxian He,Chaohu Xiao,Zhaoqi Zhu,Hanxue Sun,An Li
Solar-driven water evaporation is emerging as a promising strategy to utilize solar energy for the desalination and water purification . In this work, two kinds of monoliths based on hypercrosslinked polymers (HCPs) nanotubes , which were synthesized using inexpensive and conventional chemicals, i.e. benzene and methylbenzene as building blocks via Friedel-Crafts reaction, have been created as photothermal materials through a superhydrophilic modification followed by the coating of polypyrrole as light absorption layer . The as-synthesized HCPs possess large specific surface area (up to 773 m 2 g -1 ) and low apparent density (0.011 g cm -3 ), which endow them very low thermal conductivity (0.029 W m -1 k -1 ). After modification with sodium alginate and polypyrrole, the resulting HCPs (named as PPy-M-HCPs) show surface superhydrophilicity (water contact angle ~0°), stronger light absorption (ca. 95%) and better mechanical properties . Taking advantages of these unique physicochemical properties mentioned above, the PPy-M-HCPs exhibit outstanding light-to-heat conversion performance with a high solar conversion efficiency of ca. 87% achieved under 1 kW m -2 irradiation. In addition, the PPy-M-HCPs also show excellent salt-resistant performance, e.g. a high energy conversion efficiency of more than 85% obtained in 20 wt% NaCl solution, due to their loosely porous structure coupling with their superhydrophilic wettability . Based on the merits of simple fabrication process, excellent stability and high solar conversion efficiency, the PPy-M-HCPs may have great potentials as efficient photothermal materials for real applications.
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