JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Yulai Zhao,Mengzhi Wei,Zhongzheng Zhu,Jing Zhang,Longqiang Xiao,Linxi Hou
Biomass carbon materials which have the merits of green, low cost and renewability, can be obtained from sodium alginate (SA) beads crosslinked by polyvalent metal ions . SA beads are possible to be obtained using diammoniums as the crosslinking agents. In this work, N-O codoped porous carbon (NO-PC) was prepared from SA beads crosslinked by diammoniums through the electrostatic interaction between ammonium cations and carboxylate groups of SA chains. The using of diammoniums as the crosslinkers achieved N doping into NO-PC. Scanning and transmission electron microscope observations revealed that NO-PC possessed hierarchically porous characteristic. X-ray photoelectron spectroscopy identified the successful N-O codoping. Both the species and concentration of diammoniums strongly affected the porous structure, surface area and electrochemical performance of NO-PC. N 2 adsorption-desorption results of NO-PC indicated that the highest surface area was up to 3794 m 2 /g. The NO-PC based supercapacitors showed high specific capacities up to 269.0 F/g at 1 A/g and excellent cycling stability (92.09% after 5000 cycles at 5 A/g). The energy density of the symmetric supercapacitor was up to 18.9 Wh/kg at a power density of 1380 W/kg with a voltage window of −1.4–0 V.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Xiaoya Huang,Yan Zhang,Jing Bai,Jinhua Li,Linsen Li,Tingsheng Zhou,Shuai Chen,Jiachen Wang,Mohammadi Rahim,Xiaohong Guan,Baoxue Zhou
N-containing organic wastewater is harmful to human health and ecosystem while its degradation remains a huge challenge for decarburization and denitrification simultaneously. In this paper, we proposed a new photoelectrochemical method of chlorine oxide radicals production to oxidize mixture wastewater of phenol and N-ammonia into N 2 and CO 2 . The chlorine oxide radicals were generated via a rapid reaction of HClO with hydroxyl radicals or chlorine free radicals on a synergistic dual anode, in which hydroxyl radicals and chlorine free radicals generated on WO 3 side, and HClO generated on Sb-SnO 2 side, respectively. Phenol degradation rate on WO 3 -Sb/SnO 2 was 2.54 and 4.79 times than that on WO 3 and Sb/SnO 2 . Meanwhile, N-ammonia removal rate on WO 3 -Sb/SnO 2 was 5.69 and 20 times greater than that on WO 3 and Sb/SnO 2 , respectively. The effects of potential, Cl − concentration and initial pH were examined and the optimal conditions were potential 2.0 V vs Ag/AgCl, 0.05 M NaCl, pH = 5. The free radical quenching experiments and electron-spin resonance (ESR) confirmed that chlorine oxide radicals played an important role in the degradation of N-ammonia and phenol. Reasonable pathways of phenol in the WO 3 -Sb/SnO 2 system were also proposed. This work provides an exhaustive, novel, environmental-friendly photoelectrochemical system for N-containing organic wastewater treatment.
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高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Hongxiang Zhang,Chunxia Wu,Canran Zhang,Bisheng Yan,Jiyuan Guo,Gangyi Zhu,Jun Dai
In this paper, we report the dual-wavelength green-light emission from zinc oxide (ZnO)-nanoseed-decorated p-GaN (gallium nitride)/n-ZnO nanorod/CsPbBr3 quantum dots (QDs) light-emitting diodes (LEDs). At the same time, the effect of ZnO nanoseeds on the p-GaN/n-ZnO nanorod/CsPbBr3 QDs LED performance is deeply studied. ZnO nanoseeds were fabricated by magnetron sputtering and the sol–gel method; then ZnO nanorods were obtained on GaN by hydrothermal treatment to form the p-GaN/n-ZnO nanorod heterojunction, and green CsPbBr3 QDs were further deposited on ZnO nanorod arrays to realize LEDs. The results show that magnetron-sputtering ZnO nanoseeds can induce regular vertical ZnO nanorod arrays, and the corresponding device presents a better electroluminescence (EL) performance. The X-ray diffraction, atomic force microscopy, and EL mechanisms indicate that the p-GaN/n-ZnO nanorod with magnetron-sputtering ZnO nanoseeds has a better crystalline interface. Our results indicate that the p-GaN/n-ZnO nanorod/CsPbBr3 QDs heterojunction structure can be served as dual-wavelength LEDs, and magnetron-sputtering ZnO nanoseeds can give rise to a better EL performance.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Yan Cai,Ying Zhang,Wenjuan Yuan,Jun Yao,Guoquan Yan,Haojie Lu
For mass spectrometry (MS)-based N -glycoproteomics, selective enrichment of N -glycopeptides prior to MS analysis is a crucial step to reduce sample complexity. Enrichment based on covalent coupling is as an increasingly attractive strategy due to the unbiased and highly specific features. However, most of current covalent coupling reactions for N -glycopeptides enrichment are still limited by long coupling time and harsh coupling conditions. Herein, we developed a thiazolidine formation-based approach for ultrafast and highly efficient solid-phase extraction of N -Glycoproteome. With the use of facile synthesis of Cys-terminated magnetic nanoparticles , the oxidized glycan moieties on glycopeptides could be selectively captured by the β-amino thiols groups on the surface of magnetic nanoparticles through thiazolidine formation. The coupling could be achieved within 30 min under mild condition, eliminating the addition of toxic catalyst or sample-destroying reducing agent. Also, the great enrichment performance for N -glycopeptides were obtained in terms of sensitivity (low fmol levels), selectivity (extracting N -glycopeptides from the mixture of glycopeptides and non-glycopeptides at a 1:100 molar ratio) and reproducibility (CVs<26%). Finally, this proposed method was successfully demonstrated by analyzing the N -glycoproteome from 2 μL human serum, which offers an alternative purification method for analysis of N -glycoproteome from complex biological samples.
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高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 3
·1745-1761
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IF 3.917
Wan Caiyan,Liu Mingsheng,Tian Peixiu,Zhang Guangxian,Zhang Fengxiu
Abstract A bio-based P–N synergistic flame retardant ammonium salt of d -Panthenol-tri (methylphosphonic acid) (ADPTMPA) was synthesized using a formaldehyde-free and solvent-free strategy for the highly efficient preparation of durable flame-retardant cotton. The ADPTMPA structure was verified by 1 H NMR, 13 C NMR and 31 P NMR. FT-IR test revealed successful grafting of the flame retardant onto the cotton through P–O–C covalent bonding. The morphologies and structures of pure cotton and treated cotton were characterized by SEM and XRD, and the elemental compositions of cotton samples were analyzed by EDX. Volatile pyrolysis products of treated cotton were analyzed by TG-IR. Flame retardancy and washability of treated cotton were analyzed by limiting oxygen index (LOI) and vertical flammability tests (VFT). The LOIs of 40 wt% ADPTMPA treated cotton before and after 50 laundering cycles was determined as 46.5% and 35.8%, respectively. VFT showed the treated cotton exhibited no smoldering and continuous burning. All carbon lengths of treated cottons were less than 60 mm. The heat release rate and total heat release of treated cotton were decreased by 91.34% and 58.01% compared with pure cotton, respectively. There was 29.42 wt% carbon residual remaining when the treated cotton was exposed to heat flow of 35 kw/m 2 . The treated cotton exhibited excellent flame retardancy and washability. Additionally, the mechanical properties and whiteness of the treated cotton were well-maintained. Graphic abstract
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高影响因子
Energy & Environmental Science
·
2019
·Vol. 13
·期 1
·221-228
·
IF 33.25
Bin Liu,Shijia Feng,Lifei Yang,Chengcheng Li,Zhibin Luo,Tuo Wang,Jinlong Gong
Silicon-based (Si-based) junctions have been widely investigated in recent years as photoelectrochemical (PEC) water splitting photoelectrodes, including buried junctions and metal–insulator–semiconductor (MIS) Schottky junctions. However, Si-based MIS photoelectrodes suffer from low performance for the PEC oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) because of the dilemma that a thin insulator cannot provide enough interfacial passivation while a thick insulator will block the transport of charge carriers. Another trade-off is the fact that the photovoltage extracted from the band offset between the metal and semiconductor will be counteracted by the parasitic light absorption of the metal layer, sacrificing the saturation photocurrent. This paper describes the design and realization of a bifacial passivation strategy for the metal/Si interface of an MIS photoelectrode, featuring a bi-layer stack consisting of amorphous silicon (a-Si) for passivating the silicon surface and a metal oxide (TiO2) for passivating the metal surface. Upon the bifacial passivation of both a-Si and TiO2, the minority carrier lifetime of the Si MIS photoanode was significantly improved from 18 to 2360 μs. Enabled by this extremely long minority carrier lifetime, it becomes possible to place the MIS junction on the back side of a Si substrate to construct an inverted-MIS (I-MIS) structure to eliminate the parasitic light absorption of traditional Si MIS photoelectrodes. The obtained photoelectrode exhibits an excellent onset potential of 0.85 V and 0.62 V vs. reversible hydrogen electrode (RHE) for the OER and HER, respectively. Eventually, unprecedented applied bias photon-to-current efficiencies (ABPE) of 3.91% and 12.66% were obtained by Si MIS and Si I-MIS, which are the highest among MIS-based photoanodes and photocathodes, with 30 h and 108 h stable operation. When pairing the Si I-MIS photocathode with a BiVO4 photoanode to form a PEC membrane-free tandem cell, an unbiased solar-to-hydrogen conversion efficiency of 1.9% is achieved.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 55
·期 5
·2176-2185
·
IF 3.442
Ghorbani Marjan,Nezhad-Mokhtari Parinaz,Sohrabi Hessamaddin,Roshangar Leila
In the last years, chitosan (CS) nanofibers as one of the biodegradable biomaterials in nature for tissue engineering and related fields, including wound healing and cell–material interaction, have been widely used. For this purpose, we prepared the reinforced CS/nanocrystals cellulose-graft-poly( N -vinylcaprolactam) (CS/NCC-g-PVCL) nanofibers via the electrospinning technique. Fabricated nanofibers were characterized and studied for their structural, morphological, thermal stability, as well as mechanical and hydrophilic properties. Uniform nanofibers were achieved, and NCC-g-PVCL contents were partially embedded into CS nanofibers, as revealed in SEM analyses. Incorporation of NCC-g-PVCL contents (0.5, 2.5, and 5 wt%) enhanced the average fiber diameter of the obtained nanofibers from 100 nm (neat CS) to ∼ 350 nm [CS/NCC-g-PVCL (5 wt%)] and improved the nanofibers thermal stability. Additionally, among the CS/NCC-g-PVCL nanocomposite fibers, those loaded with 5 wt% NCC-g-PVCL had the best mechanical properties. The water contact angle of nanocomposite nanofibers increased with elevation of the weight content of NCC-g-PVCL. Cell culture results showed that the prepared nanofibers had better cytocompatibility and proliferation than neat CS nanofibers. The results proposed that the developed CS/NCC-g-PVCL nanocomposite nanofibers were promising as new biomaterials to be applied in the area of skin tissue engineering.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Chanez Maouche,Yazhou Zhou,Bing Li,Chao Cheng,Yunyan Wu,Jinghan Li,Shuai Gao,Juan Yang
N-doped graphene has attracted a considerable interest in the development of a new promising metal-free catalyst for oxygen reduction reaction (ORR) to replace platinum-based catalysts. Herein we reported a facile fabrication of three-dimensional N-doped graphene (GC) using graphitic carbon nitride (g-C 3 N 4 ) and graphene oxide (GO) as raw materials. Urea was used as a precursor of synthesizing g-C 3 N 4 and N doping. Thermal treatment has been done at different temperatures. As a result, a large surface area with a unique porous structure were obtained for the sample GC-900. Our catalyst showed an outstanding catalytic activity with superb stability and methanol tolerance. The structural characterizations of different materials demonstrated that the combination of an optimal heating temperature, a high nitrogen N content and a porous structure was essential for high ORR electrocatalytic activities .
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高影响因子
ChemSusChem
·
2019
·Vol. 13
·期 4
·741-748
·
IF 7.804
Mengfei Qiao,Ying Wang,Xamxikamar Mamat,Anran Chen,Guoan Zou,Lei Li,Guangzhi Hu,Shusheng Zhang,Xun Hu,Damien Voiry
Graphical Hierarchical electrocatalyst : Co-supported, N-doped, 3D-ordered porous carbon (Co-NOPC) is obtained by carbonization of the ordered porous metal–organic framework ZIF-67 prepared by forced molding of a polystyrene sphere (PS) template. The hierarchical porosity of Co-NOPC results in significantly improved performance as an electrocatalyst for the oxygen reduction reaction (ORR) under both alkaline and acidic conditions compared with its counterpart prepared from conventional ZIF-67. Developing highly active nonprecious-metal catalysts for the oxygen reduction reaction (ORR) is of great significance for reducing the cost of fuel cells. 3D-ordered porous structures could substantially improve the performance of the catalysts because of their excellent mass-diffusion properties and high specific surface areas. Herein, ordered porous ZIF-67 was prepared by forced molding of a polystyrene template, and Co-supported, N-doped, 3D-ordered porous carbon (Co-NOPC) was obtained after further carbonization. Co-NOPC exhibited excellent performance for the ORR in an alkaline medium with a half-wave potential of 0.86 V vs. reversible hydrogen electrode (RHE), which is higher than that of the state-of-the-art Pt/C (0.85 V vs. RHE). Moreover, the substantially improved catalytic performance of Co-NOPC compared with Co-supported, N-doped carbon revealed the key role of its hierarchical porosity in boosting the ORR. Co-NOPC also exhibited a close-to-ideal four-electron transfer path, long-term durability, and resistance to methanol penetration, which make it promising for large-scale application.
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高影响因子
Energy Technology
·
2019
·Vol. 8
·期 1
·1901013
·
IF 3.163
Xufei Liu,Peng Mei,Sheng Lei,Xiaofang Zhang,Qian Liu,Yingkui Yang
3D N-doped carbon nanobelt (NCB) networks are fabricated by one-pot hydrothermal polycondensation of co-monomer salts of dianhydride and diamine followed by carbonization of the resulting nanobelt-like polyimides. As control samples, solvothermally polymerized petal-like polyimides and conventionally polymerized spindle-like polyimides are also produced, which further yields N-doped carbon petals and N-doped carbon spindles after identical carbonization, respectively. Interestingly, all N-doped carbons copy the morphologies of their polyimide precursors well. Specially, the 800°C-treated NCB exhibits a robust 3D architecture composed of intertwined nanobelt networks with high N-doping levels and electroactivity-enriched N configurations. Remarkably, the symmetric supercapacitor assembled by such NCB electrodes delivers large specific capacitance (193 F g −1 at 1 A g −1 ), high rate capability (176 F g −1 at 20 A g −1 ), and long cycling stability (nearly 100% retention over 10,000 cycles at 20 A g −1 ). The energy density is as high as 27 Wh Kg −1 at the power density of 500 W Kg −1 , and retains 24 Wh Kg −1 at the power density up to 20,000 W Kg −1 . This work opens up an affordable and scalable approach to the rational fabrication of heteroatom-contained carbon materials for high-performance supercapacitors with well-balanced power and energy output.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Jiandang Xue,Xin Liu,Junfeng Zhang,Yan Yin,Michael D. Guiver
The knowledge that N -spirocyclic quaternary ammonium (QA) cations appear to have good alkaline stability has triggered the quest to incorporate these into anion exchange membranes (AEMs) with the anticipation of high operating stability in alkaline fuel cells . Herein, a series of poly(2,6-dimethyl-1,4-phenylene oxide)s (PPOs) incorporating spirocyclic 3,6-diazaspiro[5.5]undecane (DSU) cation/cation strings are synthesized by a two-step quaternization strategy. The properties of DSU-based single-cation and double-cation AEMs (PPO-SDSU and PPO-DDSU, respectively) are discussed and the effect of introducing heterocyclic quaternary piperidinium (Qpip) on spirocyclic DSU cation strings is investigated. Ionic clusters of larger size scattering are observed by atomic force microscopy for PPO-SDSU membranes, suggesting the dominant effect of polar tertiary nitrogen atom on the formation of ion cluster. The well-connected hydrophilic domains contributed to further increasing the water uptake and hydroxide conductivity of the AEMs. As a result, the PPO-SDSU membrane with ion exchange capacity (IEC) of 1.91 meq/g shows the highest hydroxide conductivity (31.9 mS/cm) with 76% water uptake and 9.6% linear dimensional swelling at 20 °C. Alkaline stability tests imply that the presence of Qpip in DSU cation strings alleviates the degradation of spirocyclic QA from S N 2 substitution, due to increased steric hindrance, but other considerations must address the potentially detrimental effect of Hofmann elimination on spirocyclic QA and PPO backbone scission, arising from the electron withdrawing effect of Qpip. Although hydroxide conductivity and IEC values were better retained for PPO-DDSU membranes, the inferior alkaline stability of the benzylic attached Qpip counteracted the overall stability enhancement anticipated for incorporating spirocyclic DSU cations. These results may provide valuable insights toward more effective molecular designs and new synthetic pathways to AEMs incorporating base-stable N -spirocyclic QA.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Chao Zhang,Jinhe Shu,Shuxian Shi,Jun Nie,Guiping Ma
Biomass derived porous carbon was wildly used in non-precious metal carbon based electrocatalysts for ORR due to its low cost and sustainability. Here, we develop a facile route to prepare Co/N doped hemp derived highly porous carbon (Co/NHPC) as ORR electrocatalyst. The prepared Co/NHPC-90 possess 3D hierarchically porous nanostructure with high specific surface areas (1251 m 2 g −1 ) and large pore volumes (0.99 cm 3 g −1 ) due to the chemical activation of NaHCO 3 , which is benefit for the mass/electron transfer and exposure of active sites. In addition, melamine and cobalt nitrate were selected as nitrogen and metal source respectively to enrich the density of active sites. Thus, Co/NHPC-90 exhibits excellent ORR electrocatalytic performance with high half-wave potential (0.826 V), superior catalytic stability and tolerance to methanol.
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高影响因子
危险品化学品经营许可证（带存储）