Nanomaterials
·
2020
·Vol. 10
·期 12
·2449
·
IF 4.324
Shiliang Heng,Lei Li,Weiwei Li,Haiyan Li,Jingyu Pang,Mengzhen Zhang,Yan Bai,Dongbin Dang
The development of high-efficiency, recyclable, and inexpensive photocatalysts for water splitting for hydrogen production is of great significance to the application of solar energy. Herein, a series of graphene-decorated polyoxoniobate photocatalysts Nb6/PPy-RGO (Nb6= K7HNb6O19, RGO = reduced graphene oxide, PPy = polypyrrole), with the bridging effect of polypyrrole were prepared through a simple one-step solvothermal method, which is the first example of polyoxoniobate-graphene-based nanocomposites. The as-fabricated photocatalyst showed a photocatalytic H2evolution activity without any co-catalyst. The rate of 1038 µmol g−1in 5 h under optimal condition is almost 43 times higher than that of pure K7HNb6O19·13H2O. The influencing factors for photocatalysts in photocatalytic hydrogen production under simulated sunlight were studied in detail and the feasible mechanism is presented in this paper. These results demonstrate that Nb6O19acts as the main catalyst and electron donor, RGO provides active sites, and PPy acted as an electronic bridge to extend the lifetime of photo-generated carriers, which are crucial factors for photocatalytic H2production.Keywords:polyoxoniobate;Nb6/PPy-RGO composites;electronic bridge;H2production
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 1
·1-12
·
IF 5.833
Yang Lili,Wang Jiasheng,Lü Haitao,Hui Ni
A dual-sensing platform is proposed based on multi-walled carbon nanotubes/Prussian blue–functionalized polypyrrole nanowire array (PPY/MWCNTs/PB). Highly aligned PPY nanowire arrays were electrochemically prepared on the surface of glassy carbon electrodes, which were doped with MWCNTs/PB nanocomposites. The nanomaterial combines the characteristics of the PPY nanowires (high conductivity and large specific surface area) and MWCNTs/PB (excellent catalytic performance and intrinsic redox activity). Owing to the nanowire microstructure and outstanding electrical properties, the PPY/MWCNTs/PB nanowire arrays show excellent electrocatalysis of the reduction of hydrogen peroxide and facilitate the construction of a high-performance biosensing platform for microRNA (miRNA). A linear relationship between analytical signal and concentration of hydrogen peroxide and miRNA was obtained in the range 5 to 503 µM (1.4–5.1 mM) and 0.1 pM to 1 nM, and detection limits of 1.7 μM and 33.4 fM, respectively. This new supersensitive sensing platform has broad application prospects of biomolecule and other analyte determination in drug, biomedical, plant protection, and environmental analysis. Graphical abstract
Prussian blue/multi-walled carbon nanotubes functionalized polypyrrole nanowire arrays (PPY/MWCNTs/PB) were prepared by a facile one-step electrochemical method. PPY/MWCNTs/PB nanowire arrays show excellent electrocatalysis of the reduction of H 2 O 2 and facilitate the construction of a high-performance biosensing platform for microRNA.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Yanli Bao,Haiyang Yu,Yu Zhang,Li Chen
The photosensitizers (PS) play a vital role in photodynamic therapy (PDT), but the clinical therapeutic effect is limited by its low solubility, easy aggregation and lack of selective tumor uptake. Hence, some biocompatible materials such as poly(amino acid) have been chosen to deliver PS to solve these problems. In this study, we fabricated two kind of poly(amino acid)-based PS delivery systems by using poly ( L -glutamic acid) (PLG) as the backbone material to physically encapsulate (P(T)) and chemically conjugate PS (PT), respectively. Moreover, the anticancer effect of these two PS delivery systems had been comparatively investigated. In vitro experiments verified that the delivery system of PT exhibited more effective treatment effect than that of P(T) because PS was chemically conjugated with PLG in PT which could obviously avoid the π-π stacking effect of PS and induced the aggregation. The less aggregation avoiding the quenching effect could result in an enhanced generation ability of reactive oxygen species to improve PDT treatment effect. Contrarily, the treatment effect of P(T) was lower due to the rigid structure and hydrophobic π-π stacking effect, in which the physically encapsulated PS was easier to aggregate and quench. Hence, the way how to combine carrier with drug is significant for satisfied treatment effect.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 12
·1-7
·
IF 1.81
He Song,Chang Mengyu,Liu Pengcheng,Wang Xueqin,Bai Zhongchen
We studied a Surface-enhanced Raman scattering (SERs) film by self-assembled deposition of Ag nanoparticles on the surface of PPy@PEDOT:PSS films to detect melamine molecules. The PPy@PEDOT:PSS film was prepared using an electrochemical polymerization method in a mixture solution of PPy and PEDOT:PSS. Then, Ag nanoparticles were directly deposited on the surface of PPy@PEDOT:PSS films by a chemical self-assembly method as an active SERs substrate to detect melamine molecules. The results showed that the density of Ag nanoparticles on the surface of PPy@PEDOT:PSS film was gradually increased due to the increase of depositional time of Ag nanoparticles. Accordingly, The SERs effect was also substantially enhanced. The signal of melamine was increased up to 440 times. The melamine molecules at 6.4 ng/ml concentration could be clearly identified. This preparing method of SERs film and detecting method of melamine molecules provide a new strategy for the design and application of chemical sensors and bio-sensors.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 12
·2000479
·
IF 3.853
Chunying Yang,Jialin Yin,Zhuo Chen,Haishun Du,Minghua Tian,Miaomiao Zhang,Jinxin Zheng,Lan Ding,Pengfei Zhang,Xinyu Zhang,Kuilin Deng
Retractable, self-healing, and conductive hydrogels are widely used as adjustable and wearable sensing materials. Herein, using polyfunctional trypan blue (TB) as a crosslinking agent for both poly(acrylic acid) (PAA) and polypyrrole (PPy), a retractable and self-healing PAA-TB-PPy hydrogel is prepared. The introduction of TB not only improves the water retention capacity of the hydrogel but also helps form a highly interconnected conductive path. It is found that PAA-TB-PPy hydrogel shows a high electrical conductivity (15 S m −1 ) which is almost equivalent to the pure PPy hydrogel. Due to the high stability of the semi-interpenetrating network structure, the elongation at break of PAA-TB-PPy hydrogel is more than 750%, along with high mechanical strength and strong adhesion to a variety of solid surfaces. In addition, the hydrogel exhibits high strain and pressure sensitivity with prominent linearity. Importantly, the as-prepared hydrogel sensor can reliably detect both repetitive large strain and subtle vibration, which makes it a great candidate as wearable electronics for human motion monitoring.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Ziqian Ma,Zhiqin Sun,Fengyu Qu
Pseudo-capacitive materials with high performance are always combined with carbon-based materials applying for supercapacitors, which can realize satisfactory properties of energy storage while excellent cycle life. Enhancing electrochemical performance of anodes following the method is an effective method to get high energy densities. Herein, Fe 1-x S grown on carbon nanofibers (Fe 1-x S/CFs) through electrospinning and calcination approach, possesses excellent electrochemical properties when it serves as the anode for asymmetric supercapacitors. The specific capacity of which can reach up to 238 mAh g −1 (1 A g −1 ) while remain 95.3 mAh g −1 at 15 A g −1 . The retention rate of the anode can retain 78.5% after 5000 cycles. Considering high performance of anode, NiCo 2 S 4 /NCTs with a high specific capacity of 203 mAh g −1 (1 A g −1 ) was selected as the cathode applying for all-solid-state battery-type asymmetric supercapacitor to get high energy density. Benefitting from excellent properties of both anode and cathode, as-fabricated all-solid-state battery-type asymmetric supercapacitor possesses high energy density of 55.4 Wh kg −1 at the power density of 882 W kg −1 with remarkable cyclic performance (80.6% after 5000 cycles). More important, all-solid-state battery-type asymmetric supercapacitor NiCo 2 S 4 /NCTs//Fe 1-x S/CFs-5 can work with a wide temperature range (−10 to 60 °C), which can display a specific capacity of 40.4 mAh g −1 at 1 A g −1 in −10 °C and 112.3 mAh g −1 in 60 °C. All these results indicate that as-fabricated NiCo 2 S 4 /NCTs//Fe 1-x S/CFs-5 battery-type asymmetric supercapacitor possesses great potential for future applications.
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DESALINATION
·
2020
·
IF 7.098
Weifeng Liu,Guang Yan,Erhui Zhang,Qi Liang,Lei Qin,Meiling Wang,Xuguang Liu,Yongzhen Yang
A novel lithium ion imprinted membrane (Li + -IIM) was synthesized by unipolar pulsed electropolymerization , using lithium ion as template ion, 2-hydroxymethyl-12-crown-4 ether as capture agent, pyrrole as conductive agent and crosslinking agent. The morphology and structure of the products were characterized by using field emission scanning electron microscopy and Fourier transformation infrared spectroscopy . The adsorption behaviors were detected by inductively coupled plasma-optical emission spectrometry . At pH = 1.0, the maximum adsorption capacity of Li + -IIM towards lithium ion reached 16.40 mg g −1 in 40 mg L −1 Li + solution, within 80 min. The resulting Li + -IIM exhibited excellent selectivity for Li + because the selectivity coefficients of Li + with respect to Na + , K + , Mg 2+ , Al 3+ and Fe 3+ are 4.20, 4.11, 4.13, 4.30 and 4.28, respectively. After five adsorption-desorption cycles, the adsorption capacity of Li + -IIM still maintained 95.88%, indicating that the obtained imprinted membrane has excellent regeneration ability.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Junchen Chen,Yaming Wang,Jianyun Cao,Li Liao,Yan Liu,Yu Zhou,Jia-Hu Ouyang,Dechang Jia,Mingshan Wang,Xing Li,Zhenyu Li
Uniform deposition of thin conducting polymer coatings on the surface of a porous structure is in demand for the fabrication of high performance electrodes for energy storage. A facile pulsed electrochemical method is developed in the present work for the preparation of porous reduced graphene oxide/polypyrrole (rGO/PPy) composite films. This method combines blade casting of graphene oxide (GO) gel and pulsed electrochemical technic which not only simplifies the precursor electrolyte but also preserves the porous structure of GO gel. The optimized rGO/PPy composite film exhibits a well-defined porous structure, leading to superior electrochemical performance with a high specific capacitance of 414 F g − 1 at 0.2 mA cm −2 . This optimized rGO/PPy electrode further demonstrates a large areal capacitance (419 mF cm −2 ) and excellent rate performance (180 mF cm −2 even at 40 mA cm −2 with 43% retention). Two-electrode aqueous supercapacitor based on the optimized rGO/PPy gel film electrodes exhibits excellent cycling stability with 95.7% capacitance retention after 10,000 cycles. Moreover, the as-fabricated flexible supercapacitor based on the rGO/PPy film electrodes on carbon cloth substrate shows good flexibility with 100% capacitance retention after 100 bending cycles. The present work provides a feasible electrochemical route for the fabrication of rGO based composite film electrodes.
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Small
·
2020
·Vol. 16
·期 40
·2000742
·
IF 11.459
Shan Yuan,Li-Li Cui,Zhiyu Dou,Xin Ge,Xingquan He,Wei Zhang,Tewodros Asefa
Developing efficient, inexpensive, and durable electrocatalysts for the oxygen reduction reaction (ORR) is important for the large-scale commercialization of fuel cells and metal–air batteries. Herein, a hierarchically porous bimetallic Fe/Co single-atom-coordinated N-doped carbon (Fe/Co-N x -C) electrocatalyst for ORR is synthesized from Fe/Co-coordinated polyporphyrin using silica template-assisted and silica-protection synthetic strategies. In the synthesis, first silica nanoparticles-embedded, silica-protected Fe/Co-polyporphyrin is prepared. It is then pyrolyzed and treated with acidic solution. The resulting Fe/Co-N x -C material has a large specific surface area, large electrochemically active surface area, good conductivity, and catalytically active Fe/Co-N x sites. The material exhibits a very good electrocatalytic activity for the ORR in alkaline media, with a half-wave potential of 0.86 V versus reversible hydrogen electrode, which is better than that of Pt/C (20 wt%). Furthermore, it shows an outstanding operational stability and durability during the reaction. A zinc–air battery (ZAB) assembled using Fe/Co-N x -C as an air-cathode electrocatalyst gives a high peak power density (152.0 mW cm −2 ) and shows a good recovery property. Furthermore, the performance of the battery is better than a corresponding ZAB containing Pt/C as an electrocatalyst. The work also demonstrates a synthetic route to a highly active, stable, and scalable single-atom electrocatalyst for ORR in ZABs.
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ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yafu Tang,Yuechao Yang,Shanmin Hou,Dongdong Cheng,Yuanyuan Yao,Shugang Zhang,Jiazhuo Xie,Xiaoqi Wang,Xiaoxiao Ma,Zhen Yu,Shan Li
Iron (Fe) chelated by water-soluble humic substances can effectively overcome plant micronutrient deficiencies. However, the traditional synthesis methods are often complex, expensive, and thus not applicable to large-scale industrial productions. In this work, an ecofriendly and multifunctional Fe–humic acid (HA) complex was successfully prepared through simply ball milling lignite with double-shelled Fe–N hollow mesoporous carbon microspheres (DS–Fe–N–HC). The novel DS–Fe–N–HC was synthesized using a simple strategy and was first applied in activating HA from lignite by solid-phase ball milling to attain the water-soluble HA–iron fertilizer (WHIF). The physicochemical properties of the DS–Fe–N–HC nanocomposites and WHIF were systematically characterized by a series of techniques. A traditional Fe–HA complex is mainly obtained by mixing HA and iron ions, which has poor water solubility because HA is not activated. In comparison to samples prepared with other methods, WHIF contained more stable water-soluble HA. Furthermore, the as-obtained WHIF had higher amounts of proteins and amino sugar tannin as evidenced in FT-ICR MS analysis. Moreover, WHIF contributed to higher activities in chlorophyll content, height, steam diameter, and biomass of peanuts than other samples. The results demonstrate that WHIF is effective in reducing symptoms of iron deficiency in peanuts, which can be attributed to its iron-based compounds and water-soluble HA. The findings of this study provide a promising, cost-effective, and environmentally friendly solution to mitigate iron deficiency and promote the growth of peanuts for large-scale agriculture production.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jian Zhang,Zixuan Yan,Xingzheng Liu,Yu Zhang,Haikui Zou,Yuan Le,Jian-Feng Chen
Renewable bio-based electromagnetic interference (EMI) shielding materials receive increasing attention undoubtedly. However, there is still a challenge to use raw biomass materials to construct a significant structure through an effortless and environmental route for EMI shielding applications. Herein, for the first time, we demonstrated a hybrid composite of multi-walled carbon nanotube/polypyrrole/chrome-tanned collagen fiber (MWCNT/PPy/CF), which utilized waste chrome shavings as a matrix. X-ray photoelectron spectroscopy reveals that the chromium on the CF has a binding effect on the PPy layer, which endows the tight integration between the CF and PPy layer. After the MWCNT network was loaded on the PPy layer, this ternary structure could provide stable conductive paths and a rich number of polarized interfaces. The MWCNT/PPy/CF composite exhibits superior electrical conductivity (354 ± 52 S/m), higher than PPy/CF (222 ± 38 S/m) and MWCNT/CF (104 ± 11 S/m), owing to the synergy of dual conductive structures. Notably, the shielding effectiveness (SE) value of the MWCNT/PPy/CF composite reaches 30 dB in the X band at a thickness of 0.48 mm. The shielding effectiveness of reflection (SER) (9.1 dB) is similar to that of PPy/CF (8.2 dB), while the shielding effectiveness of absorption (SEA) is significantly improved from 15.3 dB (PPy/CF) to 20.4 dB (MWCNT/PPy/CF) due to the additional coverage of the MWCNT network. This indicates the synergy between the MWCNT network and conductive PPy/CF skeleton. This work provided a method to prepare sustainable and low-cost renewable EMI shielding materials using chrome shavings. Meanwhile, this novel structure combining a conductive skeleton and heterostructure can be considered as a potential application in relevant fields.
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ChemCatChem
·
2020
·Vol. 13
·期 3
·1023-1033
·
IF 4.853
Yugang Qi,Shan Yuan,Lili Cui,Zizhun Wang,Xingquan He,Wei Zhang,Tewodros Asefa
Graphical Peak Power ! Novel hybrid materials composed of N-doped carbon nanotubes (CNTs) with several embedded Fe−Co alloy nanoparticles (CNTs@(Fe,Co)PP) that can serve as highly efficient bifunctional oxygen electrocatalysts are derived from bimetallic Fe/Co-coordinated polyporphyrin-CNTs self-assemblies via pyrolysis. The optimal electrocatalyst is used at air electrode in zinc-air battery (ZAB) delivering a higher peak power density and showing a better long-term cycling stability than a ZAB containing the noble metal electrocatalysts Pt/C+RuO 2 . The design and fabrication of efficient, less costly, and stable bifunctional oxygen electrode electrocatalysts is crucial for large-scale production of rechargeable zinc-air batteries. Herein, electrocatalytically active, hybrid materials composed of Fe−Co alloy nanoparticles-embedded N-doped carbon nanotubes (CNTs) are synthesized from Fe/Co-polyporphyrin-CNTs via pyrolysis. The materials serve as highly effective bifunctional oxygen electrode catalysts for zinc-air batteries. In particular, the one synthesized at 700 °C, named CNTs@(Fe,Co)PP-700, shows a very good activity for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in an alkaline solution. This material catalyzes ORR with a limiting current density of 5.11 mA cm −2 and a half-wave potential of 0.86 V vs RHE. It also catalyzes OER with 10 mA cm −2 at a small overpotential of 360 mV. Besides, it operates well as an air cathode in a home-made rechargeable zinc-air battery, with a small voltage gap of 0.71 V at 2 mA cm −2 , while remaining stable in hundreds of charge-discharge cycles for >83 h. Its performance in a zinc-air battery is better than that of a benchmark air-electrode containing noble metals, Pt/C+RuO 2 .
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