JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 1
·233-243
·
IF 2.647
Zhu Lin,Huang Yuhao,Wang Baoli,Zhang Yan,Zou Ruyi,Yan Lijun,Sun Wei
Achieving an efficient electrochemical hydrogen evolution reaction (HER) implies continuous development of new electrocatalysts for reducing the electrolytic energy consumption with the improvement of the stability and economical preparation in commercial applications. In this article, a binary transition-metal (Co/Ni) phosphide incorporated with an N-doped porous carbon (NPC) carrier was synthesized via a homogeneous polymerization followed by a high-temperature carbonizing and phosphating process, which was characterized by various techniques such as XRD, XPS, SEM, and EDS. The binary metal-based phosphide material (Co x P y /Ni x P y -NPC) exhibits high efficient catalytic activity for HER with low overpotential of 126 mV and 203 mV at 10 mA mg −1 in 1.0 M KOH and seawater with KOH added, respectively. Also, it exhibits satisfactory stability for a 10 h continuous test in the alkaline electrolyte. Furthermore, Co x P y /Ni x P y -NPC has good HER performance in natural seawater electrolyte with a potential difference of 110 mV (based on Pt/C at 10 mA mg −1 ), which is superior or close to that of other metal phosphides reported in literature. The excellent catalytic performance can be attributed to the synergistic effects of Co x P y and Ni x P y nanoparticles, protecting the effect of NPC to Co x P y and Ni x P y from aggregation. This work may provide an economic and convenient method to produce carbon-supported bimetallic phosphides as electrocatalytic materials.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-11
·
IF 4.38
Wang Haitao,Zou Haiyan,Liu Yingying,Liu Zhenglong,Sun Wenshuang,Lin Kunyi Andrew,Li Tielong,Luo Shuangjiang
It’s highly desired but challenging to synthesize self-supporting nanohybrid made of conductive nanoparticles with metal organic framework (MOF) materials for the application in the electrochemical field. In this work, we report the preparation of Ni 2 P embedded Ni-MOF nanosheets supported on nickel foam through partial phosphidation (Ni 2 P@Ni-MOF/NF). The self-supporting Ni 2 P@Ni-MOF/NF was directly tested as electrode for urea electrolysis. When served as anode for urea oxidation reaction (UOR), it only demands 1.41 V (vs RHE) to deliver a current of 100 mA cm −2 . And the overpotential of Ni 2 P@Ni-MOF/NF to reach 10 mA cm −2 for hydrogen evolution reaction HER was only 66 mV, remarkably lower than Ni 2 P/NF (133 mV). The exceptional electrochemical performance was attributed to the unique structure of Ni 2 P@Ni-MOF and the well exposed surface of Ni 2 P. Furthermore, the Ni 2 P@Ni-MOF/NF demonstrated outstanding longevity for both HER and UOR. The electrolyzer constructed with Ni 2 P@Ni-MOF/NF as bifunctional electrode can attain a current density of 100 mA cm −2 at a cell voltage as low as 1.65 V. Our work provides new insights for prepare MOF based nanohydrid for electrochemical application.
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MACROMOLECULAR RESEARCH
·
2021
·Vol. 29
·期 9
·625-635
·
IF 2.227
Li Li,Wang Huan,Hua Fenglin,Wang Mingming,Zhang Yuanshuo,Xi Hui,Yang Jing,Yang Zhiwang,Lei Ziqiang
An effective ternary organic-inorganic composite flame retardant of reduced graphene oxide-poly-dopamine@graphitic carbon nitride@10-(2,5-dihydroxyphenyl)-10- H -9-oxa-10-phosphaphenanthrene-10-oxide (RGO-PDA@g-C 3 N 4 @ODOPB) was successfully fabricated by co-precipitation method. Its property concerning the intrinsic flame retardancy and the mechanical performance was well studied when it was used as co-additives in combination with ammonium polyphosphate (APP) in epoxy resin (EP) samples. The surface morphology and the structure of RGO-PDA@g-C 3 N 4 @ODOPB were characterized by SEM, and the molecular structure and compositions were investigated by FT-IR, powder XRD and 1 H NMR. TGA, limit oxygen index (LOI), vertical burning test (UL-94), cone calorimeter test, and SEM were also used to investigate the thermal properties and flame retardancy of materials. As expected, the flame retardancy of EP was significantly heightened after adding of RGO-PDA@g-C 3 N 4 @ODOPB composites. It showed that with the 20% adding of RGO-PDA@g-C 3 N 4 @ODOPB/APP into EP led to the decreasing of the peak heat release rate and the total heat release at 78% and 62.5%, respectively. Meanwhile, the LOI value of the EP composites was as high as 29% and reached UL-94 V-0 rate. It was deemed that the excellent flame retardancy was attributed to the forming of compact and stable carbon layer, which was being catalytic carbonization by APP existed in the RGO-PDA@g-C 3 N 4 @ODOPB/APP composites. At the same time, the non-combustible gas released from thermal cracking of g-C 3 N 4 during the combustion also benefited the flame retardant performance of EP.
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JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·169-179
·
IF 2.496
Pang Yue-Hong,Yang Nian-Ci,Qiao Jin-Yu,Shen Xiao-Fang,Huang Yu-Ying
Benzo[a]pyrene (BaP), one of the polycyclic aromatic hydrocarbons with potential carcinogenic, mutagenic and teratogenic toxicity, have been widely concerned. Herein, we report a simple and rapid co-precipitation method for the synthesis of magnetic covalent organic framework (Fe 3 O 4 /COF-DQTp) adsorbent for BaP removal. The magnetized COF-DQTp was characterized by fourier transform infrared, X-ray diffractometer, Brunauer–Emmett–Teller, vibrating sample magnetometer, transmission electron microscopy, high angle annular dark field scanning transmission electron microscopy image and energy-dispersive X-ray spectroscopy elemental mapping. Under the optimized adsorption conditions, the adsorption efficiency was as high as 99% and the maximum adsorption capacity is 19 mg/g in 10 min. The adsorption kinetics shows that adsorption of BaP onto Fe 3 O 4 /COF-DQTp follow pseudo-second order kinetic model. Moreover, the prepared Fe 3 O 4 /COF-DQTp has good reusability and is a potential material for the adsorption of BaP.
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 10
·1577-1586
·
IF 1.931
Zhong Jun,Wang Bingbing,Sun Kai,Duan Jiang
Hyperbranched polyethylenimines (hPEIs) have diverse biological applications; however, the intrinsic toxicity is a major concern in developing hPEI-based biomaterials. This work reports the synthesis, properties, and an application as a biocompatible hPEI-based material, namely, fluorescent oxidized hPEI polymeric nanoparticles (F-ohPEIs). The synthesis was achieved through oxidation of hPEI with H 2 O 2 and subsequent cross-linking with formaldehyde, imparting to F-ohPEIs’ desired properties such as remarkably reduced positive charge density, hydrolytic degradability, low cytotoxicity, strong fluorescence emission, and stability. Furthermore, as an application, F-ohPEI demonstrated the ability to selectively respond to cupric ion in a wide concentration range of 0.02 ~ 10 μM with a low limit of detection of 0.013 μM. The synthesis strategy along with the F-ohPEI nanoparticles developed in this work is expected to find promising application in fabricating biocompatible hPEI-based biomaterials. Graphical abstract
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npj Flexible Electronics
·
2021
·Vol. 5
·期 1
·1-8
·
IF 12.74
Li Gang,Deng Zhihao,Cai Minkun,Huang Kaixi,Guo Mengxue,Zhang Ping,Hou Xingyu,Zhang Yuan,Wang Yueji,Wang Yan,Wu Xiang,Guo Chuan Fei
Hydrogels are a widely used ionic conductor in on-skin electronic and iontronic devices. However, hydrogels dehydrate in the open air and freeze at low temperatures, limiting their real applications when they are attached on skin or exposed to low temperatures. Polymer-ionic liquid gels can overcome these two obstacles, but synthetic ionic liquids are expensive and toxic. In this work, we present an ionic conductor based on polyacrylic acid (PAAc) and deep eutectic solvents (DESs) that well addresses the aforementioned challenges. We polymerize acrylic acid in DESs to get the PAAc–DES gel, which exhibits excellent stretchability (> 1000%), high electrical conductivity (1.26 mS cm −1 ), high adhesion to the skin (~ 100 N m −1 ), as well as good anti-drying and anti-freezing properties. We also demonstrate that the PAAc-DES gel can be used as an on-skin electrode to record the surface electromyographic signal with high signal quality, or as a transparent stretchable electrode in iontronic devices that can work at –20 °C. We believe that the PAAc–DES gels are an ideal candidate as epidermal electrodes or transparent stretchable electrodes.
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Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-14
·
IF 16.419
Lin Xiuzhu,Li Fan,Bing Yu,Fei Teng,Liu Sen,Zhao Hongran,Zhang Tong
A printable multifunctional electronic skin (e-skin) with an excellent self-healing ability was developed via a simple, clean and universally applicable method.
Water served as both the only solvent throughout the fabrication process and the trigger of the self-healing process. Each e-skin component was biocompatible.
Combined with conventional electronics, signals collected by the e-skin could be transmitted to smartphones via Bluetooth for post-processing.
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Chinese Medicine
·
2021
·Vol. 16
·期 1
·1-14
·
IF 5.455
Zhang Chen,Chen Zhejie,He Yanan,Xian Jing,Luo Ruifeng,Zheng Chuan,Zhang Jinming
Background The oral colon-targeting drug delivery vehicle is vital for the efficient application of curcumin (Cur) in ulcerative colitis (UC) treatment because of its lipophilicity and instability in the gastrointestinal tract.Methods The core–shell microparticle (MP) system composed of eco-friendly materials, zein and shellac, was fabricated using a coaxial electrospray technique. In this manner, Cur was loaded in the zein core, with shellac shell coating on it. The colon-targeting efficiency and accumulation capacity of shellac@Cur/zein MPs were evaluated using a fluorescence imaging test. The treatment effects of free Cur, Cur/zein MPs, and shellac@Cur/zein MPs in acute experimental colitis were compared.Results With the process parameters optimized, shellac@Cur/zein MPs were facilely fabricated with a stable cone-jet mode, exhibiting standard spherical shape, uniform size distribution (2.84 ± 0.15 µm), and high encapsulation efficiency (95.97% ± 3.51%). Particularly, with the protection of shellac@zein MPs, Cur exhibited sustained drug release in the simulated gastrointestinal tract. Additionally, the in vivo fluorescence imaging test indicated that the cargo loaded in shellac@zein MPs improves the colon-targeting efficiency and accumulation capacity at the colonitis site. More importantly, compared with either free Cur or Cur/zein MPs, the continuous oral administration of shellac@Cur/zein MPs for a week could efficiently inhibit inflammation in acute experimental colitis.Conclusion The shellac@Cur/zein MPs would act as an effective oral drug delivery system for UC management.
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EXPERIMENTS IN FLUIDS
·
2021
·Vol. 62
·期 10
·1-11
·
IF 2.48
Li Mengqi,Liu Zhaomiao,Pang Yan,Wang Ju,Lu Yao,Ren Yanlin,Zhao Siyu,Gao Shanshan
In this paper, the internal flow characteristics of shear thinning xanthan gum (0.02–0.08 wt %) non-Newtonian droplets moving in rectangular microchannels were studied by means of micro-PIV. When the capillary number Ca is less than 4.05 × 10 –3 , there are four eddies inside droplets running in the low depth-to-width ratio channel. Once the aspect ratio gets higher, more oil film resistance would result in a pair of eddies inside droplets near the channel wall at the plane of half the channel height, which means six eddies exist inside droplets in total. As Ca gradually increased to 5.06 × 10 –2 , due to the shear stress of continuous phase and the shear thinning of dispersed phase, the flow topologies inside droplets would change to symmetric butterfly wing double vortex and \(\dot{\mathrm{M}}\) structure. The uneven distribution of interfacial tension caused by the inertial aggregation of surfactants at the back end of the droplet transforms long droplets into a teardrop-like under continuous phase extrusion. Because of the continuous phase reflux in the middle of the droplet horizontal axis, an obvious pressure fluctuation is observed. At high xanthan gum concentration, the increase of viscosity leads to four eddies inside teardrop-like droplet. The essence of the flow fields inside non-Newtonian droplets is the redistribution of dispersed phase velocity with different degrees of shear thinning. The results are beneficial to the development of microfluidic flow cytometry, the control of biochemical reaction process inside droplets and the understanding of the complex logic behavior of non-Newtonian droplets in microchannels. Graphic abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 19
·23786-23797
·
IF 2.478
Zhou Dengfeng,Li Junqi,Chen Chaoyi,Chen Can,Wu Hongming,Lin Fangchang,Guo Jianbing
Ruthenium doped LiNi 0.5 Mn 1.5 O 4 (LNMO) microspheres has been prepared by a simple solid-state reaction process. The as-prepared sample was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and electrochemistry performance test. The sample shows a spinel crystal structure without RuO 2 impurity phase, and Ru doped sample crystal plane spacing increases. Combined with EDS spectrum, it indicates that the Ru ion was doped in the LNMO and distributed homogeneously. The XPS also further confirm the existence of Ru ions, and Ru has no obvious influence on Ni and Mn elements. The SEM images show that all the samples are sphere-like, with many polyhedral particles attached to the surface. When doped with 4% Ru ion, many cavities appear on the surface to form a porous structure. Electrochemical analysis confirms that the Ru-doped sample exhibits better electrochemical properties regarding discharge capacity, cycle stability, and rate performance. The 4% Ru-doped sample owns an initial discharge capacity of 125 mAh g −1 at 0.25C rate, with a capacity retention of 92% after 50 charge–discharge cycles. Moreover, at high current density (1C), Ru doped sample’s discharge capacity is 103 mAh g −1 while the original is only 86 mAh g −1 . The excellent electrochemical properties are attributed to the Ru doping that increases the interlayer spacing and reduces the charge-transfer impedance ( R ct ), which is beneficial to lithium ion-exchange.
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AMB Express
·
2021
·Vol. 11
·期 1
·1-8
·
IF 3.298
Xu Jing,Wang Bo,Zhang Wen-hui,Zhang Fu-Jian,Deng Yong-dong,Wang Yu,Gao Jian-Jie,Tian Yong-Sheng,Peng Ri-He,Yao Quan-Hong
p-Nitrophenol (PNP) is an important environmental pollutant and can causes significant environmental and health risks. Compared with the traditional methods, biodegradation is a useful one to completely remove the harmful pollutants from the environment. Here, an engineered strain was first constructed by introducing PNP biodegradation pathway via the hydroquinone (HQ) pathway into Escherichia coli. In the engineered strain BL-PNP, PNP was completely degraded to β-ketoadipate and subsequently enter the metabolites of multiple anabolic pathways. The high tolerance and rapid degradation ability to PNP enable the engineered strain to have the potential to degrade toxic substances. The engineered strain created in this study can be used as a functional strain for bioremediation of PNP and potential toxic intermediates, and the method of assembling aromatic hydrocarbons metabolic pathway can be used to eradicate nitroaromatic pollutants in the environment.
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Microbial Cell Factories
·
2021
·Vol. 20
·期 1
·1-13
·
IF 5.328
Zhang Yanfeng,He Yongzhi,Zhang Nan,Gan JiaJia,Zhang Shan,Dong Zhiyang
Background Melatonin has attracted substantial attention because of its excellent prospects for both medical applications and crop improvement. The microbial production of melatonin is a safer and more promising alternative to chemical synthesis approaches. Researchers have failed to produce high yields of melatonin in common heterologous hosts due to either the insolubility or low enzyme activity of proteins encoded by gene clusters related to melatonin biosynthesis. Results Here, a combinatorial gene pathway for melatonin production was successfully established in Escherichia coli by combining the physostigmine biosynthetic genes from Streptomyces albulus and gene encoding phenylalanine 4-hydroxylase (P4H) from Xanthomonas campestris and caffeic acid 3- O -methyltransferase (COMT) from Oryza sativa . A threefold improvement of melatonin production was achieved by balancing the expression of heterologous proteins and adding 3% glycerol. Further protein engineering and metabolic engineering were conducted to improve the conversion of N -acetylserotonin (NAS) to melatonin. Construction of COMT variant containing C303F and V321T mutations increased the production of melatonin by fivefold. Moreover, the deletion of speD gene increased the supply of S-adenosylmethionine (SAM), an indispensable cofactor of COMT, which doubled the yield of melatonin. In the final engineered strain EcMEL8, the production of NAS and melatonin reached 879.38 ± 71.42 mg/L and 136.17 ± 1.33 mg/L in a shake flask. Finally, in a 2-L bioreactor, EcMEL8 produced 1.06 ± 0.07 g/L NAS and 0.65 ± 0.11 g/L melatonin with tryptophan supplementation. Conclusions This study established a novel combinatorial pathway for melatonin biosynthesis in E. coli and provided alternative strategies for improvement of melatonin production.
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