Journal of Materials Chemistry A
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2018
·Vol. 6
·期 40
·19743-19749
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IF 9.931
Chengcheng Yan,Long Lin,Dunfeng Gao,Guoxiong Wang,Xinhe Bao
The electrochemical CO2 reduction reaction (CO2RR) powered by renewable electricity has emerged as a promising approach to alleviate global warming and energy depletion simultaneously. Notably, efficient catalysts containing Earth-abundant elements to achieve high CO2RR performance are in great demand for future applications. Herein, carbon-supported gallia gel nanoparticles were synthesized by precipitating gallium nitrate on carbon black in an ethanolic ammonia solution. Nano-sized gallia nanoparticles uniformly dispersed on the carbon support achieved a maximum CO faradaic efficiency of 77.0% at −0.71 V vs. the reversible hydrogen electrode (RHE) in CO2-saturated 0.1 M KHCO3 solution, showing a dramatic improvement compared to a bulk Ga electrode with only 24.2% CO faradaic efficiency at −0.80 V vs. RHE. X-ray photoelectron spectroscopy measurements revealed that surface Ga3+ species were reduced to metallic Ga when subjected to a negative potential during the CO2RR, indicative of the formation of oxide-derived active gallium sites. Control experiments further highlighted the necessity of close coalescence between the nano-sized gallia particles and the conductive carbon support. The present study underscores the feasibility of improving the CO2RR performance of Ga-related materials through nanostructuring of oxide-derived gallium catalysts.
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ChemCatChem
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2018
·Vol. 10
·期 14
·3040-3048
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IF 4.674
Tingxia Hu,Haiping Li,Na Du,Wanguo Hou
Graphical Iron rules : Fe-doped Bi 2 WO 6 exhibits a much higher photoactivity than Bi 2 WO 6 because of the introduction of the dopant and defect energy levels. The metal-doping of Bi-based oxide photocatalysts to enhance the photocatalytic performance has been a research hotspot in recent years, but the research on the mechanism of doping-induced photoactivity improvement is still incomplete. To illustrate the mechanism completely and clearly, Fe-doped Bi 2 WO 6 , as an example, was synthesized by a facile hydrothermal route. Fe-doped Bi 2 WO 6 exhibits a much higher photoactivity than pure Bi 2 WO 6 in the degradation of Rhodamine B (RhB) and salicylic acid (SA). By replacing W 6+ , the Fe 3+ doping narrows the energy band gap and generates many oxygen vacancies, which can increase the adsorption of both RhB and SA, and the introduced defect and Fe-doping energy levels in the band gap of Bi 2 WO 6 increase the separation efficiency of photoinduced charge carriers significantly. These lead to the considerable photoactivity enhancement of Fe-doped Bi 2 WO 6 . The photoactivity of Fe-doped Bi 2 WO 6 is stable and superior to that of most reported modified Bi 2 WO 6 photocatalysts. This work illustrates in detail the mechanism for the photoactivity improvement of Fe-doped Bi 2 WO 6 , which benefits the research of other metal-doped photocatalysts.
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FOOD CHEMISTRY
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2012
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IF 3.655
Yali Wang,Yu Zhao,K. Andrae-Marobela,H. Okatch,Jianbo Xiao
The crude polysaccharides from tea leaves (TPS) looks like have good antioxidant activities. However, whether or not the antioxidant abilities of crude TPS depend on tea polyphenols in the crude TPS is not understand. Herein, TPS fractions were isolated from crude TPS and their antioxidant activities were compared. The crude TPS showed stronger antioxidant activities than that of TPS fractions. However, EGCG (6.15 μg/mL) significantly enhanced DPPH radical scavenging potential of TPS fractions for each dose. Moreover, EGCG (8.0 μg/mL) significantly improved the reducing power of TPS fractions. EGCG causes a synergistic increase in the antioxidant activities of TPS fractions. The antioxidant activities of dextrans in the absence and presence of EGCG were investigated to illustrate that the antioxidant activities of TPS is similar to dextrans. These results illustrated that TPS fractions hardly exhibited antioxidant activities and tea polyphenols are the major antioxidant in the crude TPS. TPS as food antioxidants is an old woman’s tale.
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ELECTROCHIMICA ACTA
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2016
·
IF 4.803
Xiangli Zheng,Hongli Li,Fangquan Xia,Dong Tian,Xiaoxia Hua,Xueying Qiao,Changli Zhou
A new electrochemical sensor for ultrasensitive determination the polychlorinated biphenyls (PCBs) is presented here, exploiting the electrochemical route of sensing which has a distinct advantage over other conventional analysis. Chemically converted reduced graphene oxide modified with β-cyclodextrin polymer (β-CDP), being more soluble in water and the formation constants of target molecules with β-CDP are generally stronger and larger than that of β-CD, provides a platform for the electrochemical detection of PCBs using ferrocene as redox indicator. Ferrocene can form a host-guest complex with β-CDP. PCBs will replace the ferrocene in the cavity due to its higher affinity towards β-CDP, offering wide linear range and higher detection sensitivity via selective host-guest interaction. As ferrocene is a well known redox probe and hence can be easily detected using differential pulse voltammetery (DPV) technique. The new method exhibited excellent analytical performance toward PCBs with a low detection limit of 5.0 × 10 −13 M (S/N = 3). More importantly, the developed method was applied to the quantitative determination of PCBs level in sediment core collected from Lake Nansihu and displayed satisfactory results. These results indicate that the method offers considerable potential for trace PCBs monitoring. We believe that the method has a profound impact on the design of a convenient platform for rapid screening and determination of PCBs in environment.
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MATERIALS LETTERS
·
2016
·
IF 2.437
Xiaogang Guo,Xueming Li
This work firstly utilizes electrophoretic deposition (EPD) followed by perfluorodecyltriethoxysilane (FAS-17) modification as a novel and facile method to fabricate superhydrophobic ZnO and Bi 2 O 3 coatings with great potential application. The stable suspension consists of isopropyl alcohol and polyethyleneimine (PEI). The FESEM investigations show that the resulting two superhydrophobic oxide coatings with reticular-like structures uniformly distribute in nanoscale. The wettability results demonstrate that the water contact angle of all samples can reach to ca. 167° and remain almost unchange after exposure for nine weeks, resulting into an excellent stable superhydrophobicity. Most importantly, this paper provides an effective and low-cost strategy to fabricate to other functional superhydrophobic coatings for various applications.
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RSC Advances
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2016
·Vol. 6
·期 74
·70124-70132
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IF 3.289
T. M. Chen,J. Xiao,G. W. Yang
Inorganic artificial enzymes have been developed as potential candidates to naturally occurring enzymes, and three inorganic enzyme mimics, noble metals, metal oxides and carbon materials, have been reported so far. Here, we reported the inorganic enzyme mimic of nitride-based materials. We demonstrated that cubic boron nitride (c-BN) as an enzyme mimic showed intrinsic peroxidase-like activity towards classical colorimetric substrates in the presence of hydrogen peroxide (H2O2). The Michaelis–Menten kinetics studies indicated that the catalytic efficiency of c-BN is superior to its natural peroxidase counterparts. We also established that the peroxidase-like activity of c-BN is induced by catalyzing the decomposition of H2O2 and generating hydroxyl radicals (˙OH). Based on the color reaction, a strategy was developed for H2O2 and glucose quantitative detection with high sensitivity. A reactor was constructed by entrapping c-BN in a porous platform and the peroxidase mimic immobilization for removal of organic pollutants was successfully conducted. Additionally, c-BN can be re-used up to 5 times and retain its catalytic activity after incubation at extremes of pH and temperature. These findings open the door for the application of c-BN as a catalyst and the development of nitride-based materials in the enzyme-mimics field.
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DALTON TRANSACTIONS
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2017
·Vol. 46
·期 35
·11875-11883
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IF 4.029
Yi Ding,Ziyi Song,Qian Liu,Shaohua Wei,Lin Zhou,Jiahong Zhou,Jian Shen
Sonodynamic therapy (SDT) is a non-invasive therapeutic modality for cancer treatment. Finding new effective sonosensitizers has attracted great attention in the field of SDT. Mesoporous silica nanoparticles (MSN) have been extensively explored as a drug delivery system because of their good biocompatibility and satisfactory drug loading ability. However, there are relatively few studies devoted to using MSN as an efficient sonosensitizer. In this paper, we found that MSN could be used as an efficient sonosensitizer to induce cell apoptosis after ultrasound (US) treatment. To make the full use of MSN and increase its activity for cancer treatment, a chemotherapeutic drug was encapsulated inside MSN to achieve a chemotherapy-SDT synergistic function. Furthermore, photoinitiated polymerization cross-linked methacrylated hyaluronic acid (m-HA) gel was covered on the surface of DOX@MSN to improve its tumour targeting ability. In vitro and in vivo research studies indicated that the degradation of the m-HA shell by hyaluronidase (HAase) that is concentrated in the tumour environment results in the release of DOX@MSN. Importantly, subsequent US treatment could not only trigger SDT of MSN but also promote DOX release from MSN to show chemotherapeutic activity.
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ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Bin Li,Ruiqing Ge,Wenwen Du,Zhenning Wang,Tao Peng,Ruojiang Wang,Yu Chang,Tingrui Pan
Woodwork is involved in a variety of interactions with humans through physical contact, which may reveal valuable information if the tactile data can be unnoticeably extracted. In this work, an intelligent iontronic wood (iWood) device, along with its seamlessly integrated architecture into the woodwork, enabled by the iontronic sensing principle, is implemented. Notably, the tactile sensing structure is generated at the iontronic interface between ionic and conductive woods. In particular, the ionic wood is established by infusing an ionic liquid into the wood, followed by immobilizing it via chemical bonding, presenting both prominent ionic conductivity and excellent stability under pressure. By formatting the woods into identical strips, the high-density tactile sensing array can be simply formed by a braiding process for a scalable interwoven structure. As a result, the iWood device has offered a high sensitivity over a broad detection of 0.5 MPa and an array of 40 × 90 units covering an area up to 3600 cm 2 . The iWood device is showcased as an interactive human interface, demonstrating its potential as a smart desktop capable of gesture and object recognition, a health-tracking chair for real-time ballistocardiograph monitoring, and an embedded intelligent floor for weight management and gait analysis.
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CHEMICAL PAPERS
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2018
·Vol. 72
·期 6
·1525-1534
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IF 0.963
Shi Xiang,Shi Hong-Xin,Wu Hong-Ke,Shen Hai-Min,Cao Peng
A novel environmentally friendly fluorinated diamine N-[2-[(2-aminoethyl) amino]ethyl]-perfluoro-2,5-dimethyl-3,6-dioxa-nonanamide(FDETA) was synthesized for the first time based on diethylenetriamine and ethyl perfluoro-2,5-dimethyl-3,6-dioxa-nonanoate (FEt). It was characterized by means of Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and mass spectroscopy (MS). Subsequently, fluorinated polyurethanes (FPUs) containing various amounts of FDETA were then synthesized using hexamethylene diisocyanate (HDI), poly(tetramethylene oxide glycol) (PTMG), FDETA and 1,4-butanediol (BDO) as the main starting materials. Results of proton 1 H NMR and FTIR had verified successful incorporation of the FDETA chain extenders into FPU backbones. The surface properties of FPUs were detected by contact angle measurement, scanning electron microscope (SEM), and energy-dispersive X-ray spectroscopy (EDX). The thermal property of FPUs was also investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Results from EDX, SEM and contact angle studies indicated that fluorinated side chains in the hard segments had indeed migrated onto the surface. Results from DSC and TGA studies indicated that the thermal stability and the degree of phase separation were also improved.
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JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 2
·1-12
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IF 2.127
Yang Dong,Zou Xiaoyan,Tong Zhenwei,Nan Yanhu,Ding Fei,Jiang Zhongyi
One-dimensional nanotubes have attracted enormous attention due to their specific structure and excellent performance since the carbon nanotube was prepared. In this study, the open-ended SrTiO 3 nanotubes (STNTs) have been fabricated for the first time via an isomorphic conversion strategy using the protonated titanate nanotubes (HTNTs) as the precursor and template under the hydrothermal treatment. The as-prepared STNTs consist of uniform and continuous multilayers, having inner and outer diameters about 8.0 and 13 nm. The STNT formation involves the exchange of Sr 2+ ions with H + ions in HTNTs and then in situ growth of cubic SrTiO 3 crystals by the templating of HTNT frameworks. It is found that the diffusion process of Sr 2+ ions plays a critical role in controlling the nanotube morphology of SrTiO 3 crystals. In addition, the SrTiO 3 nanotubes exhibit high photocatalytic activity for the Cr(VI) reduction, which can reduce nearly 100% Cr(VI) within 6 h under simulated sunlight irradiation. The current strategy may be broadly applicable for fabricating the nanotubes from raw materials without 2D layered nanostructure.
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Journal of Materials Chemistry C
·
2017
·Vol. 6
·期 2
·388-392
·
IF 5.256
Yaoguo Shen,Sangen Zhao,Chenxi Wang,Zujian Wang,Jianghe Feng,Maochun Hong,Junhua Luo
Bistable compounds have attracted intensive interest because of their great potential to realize seamless integration of multifunctional switches in one device. However, previous studies are mainly limited to organic–inorganic hybrid compounds, which have relatively low phase-transition temperature and thermal stability. Here, we report a new pure inorganic compound CsCdPO4, which undergoes a high-temperature phase transition at 447 K. Correspondingly, CsCdPO4 simultaneously shows an interesting duple bistability of nonlinear optical and dielectric properties. Furthermore, it shows an extremely high thermal stability up to 1418 K, which is significantly higher than those of organic–inorganic bistable compounds. This work will open up a new avenue to develop multifunctional materials that remain stable even under extreme operating conditions (e.g. extremes of temperature).
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ACS Synthetic Biology
·
2018
·
IF 5.316
Xianglai Li,Zhenya Chen,Yifei Wu,Yajun Yan,Xinxiao Sun,Qipeng Yuan
Hydroxytyrosol (HT) is a valuable natural phenolic compound with strong antioxidant activity and various physiological and pharmaceutical functions. In this study, we established an artificial pathway for HT biosynthesis. First, efficient enzymes were selected to construct a tyrosol biosynthetic pathway. Aro10 from Saccharomyces cerevisiae was shown to be a better ketoacid decarboxylase than Kivd from Lactococcus lactis for tyrosol production. While knockout of feaB significantly decreased accumulation of the byproduct 4-hydroxyphenylacetic acid, overexpression of alcohol dehydrogenase ADH6 further improved tyrosol production. The titers of tyrosol reached 1469 ± 56 mg/L from tyrosine and 620 ± 23 mg/L from simple carbon sources, respectively. The pathway was further extended for HT production by overexpressing Escherichia coli native hydroxylase HpaBC. To enhance transamination of tyrosine to 4-hydroxyphenylpyruvate, NH4Cl was removed from the culture media. To decrease oxidation of HT, ascorbic acid was added to the cell culture. To reduce the toxicity of HT, 1-dodecanol was selected as the extractant for in situ removal of HT. These efforts led to an additive increase in HT titer to 1243 ± 165 mg/L in the feeding experiment. Assembly of the full pathway resulted in 647 ± 35 mg/L of HT from simple carbon sources. This work provides a promising alternative for sustainable production of HT, which shows scale-up potential.
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