ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Penghui Ding,Jun Di,Xiaoliu Chen,Mengxia Ji,Kaizhi Gu,Sheng Yin,Gaopeng Liu,Fei Zhang,Jiexiang Xia,Huaming Li
In this study, S, N codoped graphene quantum dots/(BiO)2CO3 hollow microspheres have been fabricated by a facile electrostatic self-assembly method. The nanosized S, N:GQDs, which can be obtained by a bottom-up approach, are superior surface modification materials for photocatalytic applications due to their better electron transfer and peroxidase mimetic properties. The excellent oxidation property of the synthesized nanocomposite is confirmed by degradation of different model pollutants, such as rhodamine B, tetracycline, and bisphenol A under light irradiation or dark situation. Based on several experiments, the essential roles of S, N:GQDs can be described as (i) a photocarrier transport center strengthening photoinduced charge carriers (h+–e–) separation and (ii) an enzymatic-like catalysis center to accelerate H2O2 decomposition to produce ·OH because the surface accumulation of H2O2 is harmful for photocatalytic processes. The present work may pave the way for integrating enzymatic-like cocatalysis into a photocatalytic process to generate more reactive oxygen species, thus advancing the field of environmental remediation and synthetic chemistry.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Jieting Ding,Peng Wang,Shan Ji,Hui Wang,Vladimir Linkov,Rongfang Wang
The development of low-cost bifunctional catalysts with high catalytic activity and durability for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a critical step for successful commercialization of Zn-air batteries. In this study, N-doped mesoporous carbon containing dispersed FeN x species is prepared and tested as an ORR and OER bifunctional catalyst for this battery type. Physical-chemical characterization of the newly prepared material demonstrated that NaCl can be effective as a porous structure forming template during carbonization . Resulting mesoporous structure containing FeN x species provides significant number of ORR and OER active sites. The optimized catalyst displays higher limiting current density and more positive half-wave potential for ORR than commercial Pt/C, as well as lower overpotential for OER than RuO 2 in KOH electrolyte. Furthermore, the obtained carbon material used as an air cathode in a specially assembled rechargeable Zn-air cell demonstrates electrocatalytic performance superior to those of Pt/C and RuO 2 electrodes, which makes it a promising non-precious metal bifunctional catalyst for Zn-air batteries.
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Royal Society Open Science
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2019
·Vol. 6
·期 8
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IF 2.515
Ran Liu,Ke Zhang,Chen Liu,Yanhui Hu,Lilong Zhou,Juan Zhang
Four kinds of functional ionic liquids (ILs) ([C3SO3Hnmp]HSO4), 1-(3-sulfopropyl)-1-methylpyrrolidone phosphate ([C3SO3Hnmp]H2PO4), 1-(3-sulfopropyl)-1-methylpyrrolidone p-toluene sulfonate ([C3SO3Hnmp]CH3SO3H) and 1-(3-sulfopropyl)-1-methylpyrrolidone methyl sulfonate ([C3SO3Hnmp]C6H6SO3H)) were prepared and the catalytic activity of these ILs during esterification of carboxylic acids (formic acid, acetic acid, propionic acid, butyric acid) with alcohols was investigated. The results indicated that the IL ([C3SO3Hnmp]HSO4) exhibited an optimal catalytic performance. And then the IL ([C3SO3Hnmp]HSO4) was immobilized to the silica gel. The immobilized IL performed more excellent catalytic activity than the unsupported [C3SO3Hnmp]HSO4. The effects of reaction temperature, reaction time, molar ratio of acid to alcohol and catalyst dosage were investigated. The response surface methodology based on the Box–Behnken design (BBD) was used to explore the best reaction condition of different experimental variables. Accordingly, a high n-butyl butyrate yield of 97.10% under the deduced optimal reaction conditions was obtained, in good agreement with experimental results and that predicted by the BBD model. The immobilized IL [C3SO3Hnmp]HSO4 maintained high catalytic activity after five cycles.
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JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 6
·1-10
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IF 2.009
Wang Wenfang,Liu Jing,Li Xia,Jiang Qinglin,Xu Jingkun,Luo Chan,Liu Peipei,Tan Rongri,Du Yukou,Jiang Fengxing
One-dimensional silver telluride nanowires (NWs) as potential thermoelectric materials have been studied extensively. At present, most of the efforts are focused on p-type silver telluride, while limited works have been achieved on the preparation of n-type silver telluride. Herein, we prepared n-type Te/Ag 2 Te NWs by galvanic exchange reaction and fabricated a nanofilm. As a simple and cost-effective method, galvanic exchange reaction was employed to prepare n-type Te/Ag 2 Te NWs with obtained Seebeck coefficient of − 93.98 μV K −1 . The nanostructure and chemical composition as well as structural phase transition of as-prepared n-type Te/Ag 2 Te NWs were characterized and discussed. Besides, the thermoelectric thin film device consisting of n-type Te/Ag 2 Te nanofilms and p-type Ag-doped Te nanofilms obtained by one-step hydrothermal method was assembled and exhibited accessible output voltage as 65 mV at the 75 K temperature difference, which may provide the fundament for the development of inorganic thermoelectric nanofilm device.
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Nature Communications
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2019
·Vol. 10
·期 1
·1-9
·
IF 11.878
Qi Yu,Wang Jinyan,Kou Yan,Pang Hongchang,Zhang Shouhai,Li Nan,Liu Cheng,Weng Zhihuan,Jian Xigao
Aromatic N-heterocyclic compounds are very important chemicals, which are currently produced mostly from petroleum. Here we report that a pyridazine-based compound 6-(4-hydroxy-3-methoxyphenyl)pyridazin-3(2H)-one (GSPZ) can be efficiently synthesized by the Friedel-Crafts reaction of guaiacol and succinic anhydride, both of which can be derived from biomass. GSPZ is then treated with bio-based epichlorohydrin to prepare the epoxy resin precursor GSPZ-EP. With 4,4'-diaminodiphenylmethane as curing agent, GSPZ-EP possesses higher glass transition temperature (187 o C vs. 173 o C) and shows a 140%, 70 and 93% increase in char yield (in N 2 ), storage modulus (30 o C) and Young’s modulus, respectively when compared with a standard petroleum-based bisphenol A epoxy resin. Moreover, the cured GSPZ-EP shows good intrinsic flame retardancy properties and is very close to the V-0 rating of UL-94 test. This work opens the door for production of aromatic N-heterocyclic compounds, which can be derived from biomass and employed to construct high performance polymers.
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SYNTHESIS-STUTTGART
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2019
·Vol. 51
·期 16
·3085-3090
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IF 2.867
Menglan Wang,Yudong Li,Qing-An Wu,Shuping Luo,Yuehui Li
Indole scaffold synthesis relies primarily on oxidative C–H amination of N-protected alkenylanilines for C–N intramolecular cyclization reactions. Herein, for the first time, without N-protection, various readily prepared 2-alkenylanilines were transformed into the desired indole products in good yields by using K2S2O8 as oxidant in the presence of catalytic amounts of FeF2. The K2S2O8/FeF2 system offers a direct and benign synthetic route to 3-arylindoles and it is applicable to a wide range of substituted indoles including drug intermediates.
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ORGANIC ELECTRONICS
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2018
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IF 3.68
Xiao Gong,Wenwen Ma,Yunxia Li,Lingqi Zhong,Wenjing Li,Xiujian Zhao
Luminescent solar concentrators (LSCs) as alternatives to solar cells are suitable for photovoltaic windows. Generally semiconductor quantum dots are employed as emitters for LSC fabrication due to their advantages such as photostability, spectral tunability, and high photoluminescence quantum yield . In this paper, we used low cost and environmentally friendly N-doped carbon-dots (N-CDs) as phosphors to fabricate N-CDs/PMMA slab based luminescent solar concentrators. The high-performance N-CDs/PMMA slab based LSCs with an external optical efficiency of 12.23% could be achieved when the concentration of N-CDs within the PMMA matrix is 0.08 wt%. Our results showed that N-CDs/PMMA slab based luminescent solar concentrators make the practical use of LSCs more feasible because of the unique properties of N-CDs.
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Journal of Energy Chemistry
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2018
·
IF 3.886
Jie Yin,Binbin Wei,Yuxuan Li,Yefei Li,Pinxian Xi
Achieving high activity and stability oxygen evolution reaction (OER) catalysts to optimize the efficiency of metal−air battery , water splitting and other energy conversion devices, remains a formidable challenge. Herein, we demonstrate the metallic porous nanowires arrays with abundant defects via nitrogen and copper codoped CoS 1.97 nanowires (N−CuCoS 1.97 NWs). The N−CuCoS 1.97 NWs can serve as an excellent OER self-supported electrode with an overpotential of 280 mV ( j = 10 mA cm −2 ) and remarkable long-term stability. The X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectrum (XPS) measurements confirmed the surface lattice oxygen created on the N−CuCoS 1.97 NWs during OER. Then, the density function theory (DFT) results evident that lattice oxygen constructed surface of N−CuCoS 1.97 NWs has more favorable OER energetic profiles and absorption for reaction intermediate. More importantly, the flexible and wearable Zn−air battery fabricated by the N−CuCoS 1.97 NWs shows excellent rechargeable and mechanical stability, which can be used in portable mobile device.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 31
·31091-31100
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IF 2.8
Lei Yu,Zhu Chengzhu,Lu Jun,Zhu Yongchao,Zhang Qiuyue,Chen Tianhu,Xiong Hongbin
The photochemical oxidation of di- n -butyl phthalate (DBP) by • OH radicals from nitrous acid (HONO) in atmospheric hydrometeors was explored by two techniques, steady-state irradiation, and laser flash photolysis (LFP). The effects of atmospheric liquid parameters on DBP transformation were systematically evaluated, showing that DBP does not react with HONO directly and • OH-initiated reactions are crucial steps for consumption and transformation of DBP. Two reaction channels are operative: • OH addition and hydrogen atom abstraction. The overall rate constant for the reaction of DBP with • OH is 5.7 × 10 9 M −1 s −1 , and its specific rate constant for addition is 3.7 × 10 9 M −1 s −1 determined by using laser flash photolysis technique. Comparing the individual reaction rate constant for aromatic ring addition with the total rate constant, the majority of the • OH radicals (about 65%) attack the aromatic ring. The major transformation products were identified by GC-MS, and the trends of their yields derived from both ring addition and H-abstraction with time are discussed. These results provide important insights into the photochemical transformation of DBP in atmospheric hydrometeors and contribute to atmospheric aerosol chemistry.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-11
·
IF 4.122
Zhuang Xueheng,Zhang Ying,Cai Chang,Zhang Jing,Zhu Yuejin
Magnetic microencapsulated phase change materials (magnetic MicroPCMs) are hotly researched for their dual-functions with phase change and magnetic properties, which provided the new applications in fields of maneuverable phase change materials and infrared electromagnetic dual shield. A series of magnetic MicroPCMs samples are synthesized by polymerization and coprecipitation method and the chemical composition contained poly(MMA-MAA) @ n-octadecane modified by Fe 3 O 4 . In addition, the characterizations exhibit the excellent magnetic and phase change properties. The magnetic MicroPCMs samples present 20 emu·g −1 saturation magnetization with still high enthalpy of 132 J·g −1 , which fully illustrates that the magnetic MicroPCMs fulfill both application on thermal energy storage and magnetic control.
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ACS Applied Materials & Interfaces
·
2015
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IF 6.723
Dongdong Xu,Huanan Yu,Qun Xu,Guiheng Xu,Kaixi Wang
In this work, we report a simple method to fabricate smart polymers engineered with hierarchical photonic structures of Morpho butterfly wing to present high performance that are capable of color tunability over temperature. The materials were assembled by combining functional temperature responsivity of poly(N-isopropylacrylamide)-co-acrylic acid (PNIPAm-co-AAc) with the biological photonic crystal (PC) structure of Morpho butterfly wing, and then the synergistic effect between the functional polymer and the natural PC structure was created. Their cooperativity is instantiated in the phase transition of PNIPAm-co-AAc (varying with the change of temperature) that can alter the nanostructure of PCs, which further leads to the reversible spectrum response property of the modified hierarchical photonic structures. The cost-effective biomimetic technique presented here highlights the bright prospect of fabrication of more stimuli-responsive functional materials via coassembling smart polymers and biohierarchical structures, and it will be an important platform for the development of nanosmart biomaterials.
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ELECTROCHIMICA ACTA
·
2013
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IF 3.777
Jiu-Ju Feng,Zhang-Ying Lv,Su-Fang Qin,Ao-Qi Li,Yao Fei,Ai-Jun Wang
Au porous textile-like sheet arrays (AuPTSAs) have been facilely prepared on a glassy carbon electrode (GCE) by one-step electrodeposition, which are performed at -0.4 V for 600 s in the electrolysis solution containing 10 mM HAuCl 4 , 1.25 M N -methylimdazole and 0.5 M H 2 SO 4 . N -methylimdazole plays an important role in the formation of the gold nanostructures. This approach is simple and facile, whereas no additional issues such as seeds, templates, and surfactants are required. Thus prepared AuPTSAs are perpendicular to the electrode surface and growing in the (1 1 1) directions and their growth mechanism is discussed in some detail. The AuPTSAs show enhanced electrocatalytic activity with better stability toward methanol oxidation in alkaline media, compared with those of polycrystalline Au nanoparticles.
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