COLLOID AND POLYMER SCIENCE
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2016
·Vol. 294
·期 8
·1359-1367
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IF 1.89
Yu Fengyang,Fang Yi,Wang Jingjing,Xu Yanling,Shi Jun
Microcapsules with smooth, transparent, and compact walls used for electrophoretic displays (EPDs) were prepared and characterized. The approach to fabricate EPD microcapsules was based on templating an oil-in-water emulsion stabilized by monodispersed poly(methyl methacrylate- co -butyl methacrylate- co -acrylic acid) latex particles synthesized by dispersion polymerization. The individual latex particles were then transformed into robust capsule walls by successively using solvent swelling, covalent cross-linking, and sintering. The diameter of the emulsion droplets was controlled by changing the concentration of latex in the emulsion, and the thickness of the wall changed according to the diameter of the latex particles. These microcapsules for EPDs were applied successfully in preparing a clock display panel controlled by a single-chip microprocessor operated at a low direct current voltage, demonstrating that these microcapsules can be used in EPDs.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
·
IF 3.525
Hualin Jiang,Jun Liu,Menglin Li,Lei Tian,Gongsheng Ding,Pinghua Chen,Xubiao Luo
Lattice-doping and surface decoration are prospective routes to improve the visible-light photocatalytic ability of TiO 2 , but the two techniques are difficult to combine into one preparation process because they are usually conducted under different conditions, which limits the efficiency of TiO 2 modification. In this study, TiO 2 was successfully modified by simultaneous lattice-doping and surface decoration, and the visible-light photocatalytic capacity was largely improved. Upon comparing the method reported here with previous ones, the most significant difference is that Fe(II)-phenanthroline was first used as the co-precursor of the introduced elements of C, N, and Fe. These three elements were simultaneously introduced to TiO 2 at high levels by this co-precursor method. The as-synthesized photocatalysts were systemically investigated and analyzed by several characterization methods such as XRD , FT-IR, XPS , Raman spectroscopy , EPR , UV-Vis DRS, photoluminescence spectra, photocurrent , electrochemical impedance spectra, TEM, and HRTEM . The photocatalytic degradation of 4-NP under visible-light irradiation was used to evaluate the photocatalytic activity of the photocatalysts. Based on the experimental data, a probable mechanism for the photocatalytic degradation by the photocatalysts is proposed. This is a novel method of using one source to simultaneously introduce metal and non-metal elements to TiO 2 at high levels, which may provide a new way to prepare highly effective TiO 2 photocatalysts.
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高影响因子
Energy Materials
·
2025
·Vol. 5
·期 6
·N
·
IF 11.2
Jing Peng,Ting Xue,Zhitong Li,Junwei Shi,Xingzhu Wang,Baomin Xu
Atomically dispersed metal catalysts coordinated with nitrogen coordination and anchored to carbon substrates (M-N-C) have become highly effective alternatives to platinum-group catalysts for oxygen electrocatalysis. However, the catalytic efficacy of M-N-C systems remains constrained by the suboptimal performance associated with the symmetric charge distribution around the active metal centers. The synergistic co-design of asymmetric metal single-atom catalytic centers with heteroatom doping significantly enhances the bifunctional oxygen electrocatalytic activity and durability, advancing the capabilities of next-generation flexible zinc-air batteries. Herein, we developed a pyrolysis-secondary coordination strategy to generate a bifunctional oxygen electrocatalyst, characterized by single Co atoms integrated within an asymmetrical Co-N5S1 moiety, along with nanocluster complexes embedded in N,P,S-codoped carbon frameworks, labeled CoSA+NC/NPSC. In the CoSA+NC/NPSC catalyst, the Co-N5S1 active sites exhibit an optimized electronic configuration, achieved through the synergistic coordination of heteroatom doping and nanocluster integration. Theoretically, this configuration significantly lowers the energy barriers and adjusts the d-band center, ensuring a more balanced binding strength between active sites and the oxygen-containing intermediates and contributing to the promoted bifunctional oxygen reduction reaction/oxygen evolution reaction efficiency. The experimentally analytical results reveal that the CoSA+NC/NPSC demonstrates an impressive oxygen evolution reaction activity (Ej=10 = 1.58 V) and a narrow bifunctional potential gap (ΔE = 0.75 V), remarkably superior to the counterparts with symmetric Co-S coordination or phosphorus-free doping. When assembled as an air electrode, the CoSA+NC/NPSC-based flexible zinc-air battery exhibits ultralong charge-discharge life (> 105 h) and impressive initial round-trip efficiency of 72.42% even at 0 °C.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 65
·59946-59955
·
IF 3.289
Liangliang Dong,Yue Wang,Mingqing Chen,Dongjian Shi,Xiaojie Li,Chunfang Zhang,Hui Wang
We report a high performance and CO2-philic, comb copolymer consisting of poly(ethylene glycol) methyl ether methacrylate (PEGMA), polymethyl methacrylate (PMMA) and poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) for use in composite membranes for CO2/N2 separation. Since the copolymers contain ethylene oxide (EO) groups and amino groups, the separation performance was expected to be enhanced by the synergistic effect of (1) the increased solubility of CO2 by dipole–dipole interactions between CO2 and EO units and (2) the enhanced CO2 transport by reversible reactions between CO2 and amino groups. The best separation performance was obtained from the PEDM5 composite membrane with 25 mol% of PEGMA, at which the CO2 permeability was 308 barrer and CO2/N2 selectivity was 38, which displays a potentially promising alternative for CO2 separation from N2.
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高影响因子
Materials Today Sustainability
·
2022
·
IF 7.244
X. Zhang,J. Xu,L. Wu
Fuel cells and metal-air batteries attracted extensive research attention owing to high power density, renewability, and environmental friendliness. Hence, developing heteroatom-doped pyridinic N abundant porous carbon materials with large surface area have an extensive effect on oxygen reduction reaction (ORR) for fuel cell and metal-air battery. Herein, high content of pyridinic N porous carbon-supported Co/Co-N x nanoparticles were synthesized as ORR catalysts by carbonizing complexes of hexamethylenetetramine (HMT) and Co(NO 3 ) 2 ·6H 2 O with silica template. The HMT-Co@SiO 2 -900 with high content of pyridinic N, large specific surface area, and porous structure exhibits a more positive half-wave potential (0.85 V) than 20% Pt/C and the outstanding performance oxygen evolution reaction behavior. The low Tafel slope of HMT-Co@SiO 2 -900 revealed the faster reaction kinetics during ORR. The HMT-Co@SiO 2 -900 zinc-air battery showed a high excellent cyclic stability in continuous charge/discharge cycles for 420 times at 10 mA/cm 2 . This research provides an efficient strategy for the preparation of pyridinic N porous electrocatalyst by the reduction of diffusion restriction and exposure of active sites.
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高影响因子
ACS ES&T Engineering
·
2021
·
IF 0
Zihao Zhao,Xinhong Li,Hongchao Li,Jieshu Qian,Bingcai Pan
The combination of Co(II) and peracetic acid (PAA) is an important alternative advanced oxidation process (AOPs), in which R-O• radicals including acetyloxyl radicals (CH3C(O)O•) and acetylperoxyl radicals (CH3C(O)OO•) have been considered to be the primary reactive species for the oxidative degradation of contaminants. However, it is still unclear how the active Co species participates in this process. In this study, we conduct a series of experiments including chemical probing, radical quenching, electron paramagnetic resonance (EPR), and Co(III) oxidation to investigate the degradation mechanism of contaminants in the Co(II)/PAA process, using bisphenol A (BPA) as target pollutant. On the basis of these results, we propose a Co(II)-PAA complex (Co(II)-OO(O)CCH3) to be the primary reactive species, while R-O• radicals and Co(III) (available as dimeric Co-peroxide species) derived from the decomposition of Co(II)-PAA complex are the minor contributors for the oxidation of BPA. Factors, including PAA concentration, Co(II) concentration, solution pH, inorganic anions, and natural organic matters (NOM), that might affect the oxidation performance of the Co(II)/PAA process were also investigated systematically. This study sheds new light on the mechanistic understanding of the Co(II)/PAA process for the oxidation of contaminants in water.
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JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Min Wei,Lei Huang,Shangli Huang,Zhenyu Chen,Dandan Lyu,Xiaoran Zhang,Shuangbao Wang,Zhi Qun Tian,Pei Kang Shen
Improving utilization of precious metals is one of the crucial challenges for electrochemical energy catalysis. Tuning precious metal structure to expose active sites is an effective strategy to reduce mass loading in the practical application. Herein, Pt-Co hollow nanospheres were synthesized via a sequential reduction strategy using amorphous Co-B-O complex as the key spheres-forming intermediates. The modulation mechanism of Pt-Co hollow nanospheres formation was established by investigating critical factors of addition sequence of reducing agent, the type of reducing agents and the ratio of Pt and Co precursors. The optimized Pt-Co hollow nanospheres with the Pt/Co molar ratio of 1:1 by this method is characterized by the average diameter of around 30 nm and the shell thickness of 2.3 nm. They displays superior performance for enhanced hydrogen evolution reaction (HER) in the aspect of activity and stability in 0.5 M H 2 SO 4 , in which the mass activity of the Pt-Co hollow spheres exhibits 2.82 times higher than that of commercial Pt/C and its stability also has a significant enhancement. The outstanding activity of the Pt-Co hollow nanospheres for HER is mainly attributed to its highly accessible electron/mass transport path, expose active sites on the ultra-thin shells and strain effect induced by the hollow sphere structure. This hollow nanospheres with ultra-thin shell provides a promising way to develop highly efficient precious metal based electrocatalysts.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiwen Tao,Zhengguang Zhang,Zheng Li,Shuangsheng Xiong,Shengmei Wang,Faming Gao,Chen Wang,Li Hou
Potassium-ion batteries (PIBs) have become the desirable alternatives for lithium-ion batteries (LIBs) originating from abundant reserves and appropriate redox potential, while the considerable radius size of K+ leading to poor reaction kinetics and huge volume expansion limits the practical application of PIBs. Hybridization of transition-metal phosphides and carbon substrates can effectively optimize the obstacles of poor conductivity, sluggish kinetics, and huge volume variation. Thus, the peapod-like structural MxPy@BNCNTs (M = Fe, Co, and Ni) composites as anode materials for PIBs were synthesized through a facile strategy. Notably, the unique architecture of B/N codoped carbon nanotube array as fast ion/electron transfer pathways effectively improves the electronic conductivity of composites. The MxPy nanoparticles (NPs) are encapsulated in BNCNTs with an amorphous carbon layer (5–10 nm), which discernibly alleviate the volume changes during potassiation/depotassiation. In conclusion, the composites show a commendable cycling performance, possessing reversible capacities of 111, 152, and 122 mA h g–1 after 1000 cycles at 1.0 A g–1 with a negligible capacity loss for FeP@BNCNT, CoP/Co2P@BNCNT, and Ni2P@BNCNT electrodes, respectively. Especially, after 1000 cycles at 2.0 A g–1, the CoP/Co2P@BNCNT electrode still possesses a capacity of 87.9 mA h g–1, demonstrating excellent rate performance and long-term life. This work may offer an innovative and viable route to construct a stable architecture for solving the issue of poor stability of TMP-based anodes at a high current density.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xinxin Zhang,Kang Hu,Xuliang Zhang,Wajid Ali,Zhijun Li,Yang Qu,Hao Wang,Qingyang Zhang,Liqiang Jing
In this work, an in-situ way has been developed to achieve the co-modification of highly-dispersed Mn and Cu oxides to g-C 3 N 4 nanosheets for efficient CO 2 reduction. The Mn & Cu amount-optimized nanosheets exhibit the improved photocatalytic activity for CO 2 reduction to CO and CH 4 both by 3 times compared with the generally-bulk g-C 3 N 4 , mainly attributed to the nanosheet structure and to the roles of modified Mn and Cu oxides. Based on the transient-state surface photovoltage responses, transient-state photoluminescence spectra, and electrochemical measurements, it is confirmed that the modified Mn and Cu oxides could respectively capture the photogenerated holes and electrons, and provide the catalytic functions for water oxidation and CO 2 reduction. Remarkably, the simultaneous introduction of Mn and Cu oxides shows an obvious synergistic effect on the improvement of photocatalytic activity for CO 2 reduction. This work provides a feasible way to synthesize high-activity g-C 3 N 4 -based photocatalysts for energy production.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5807-5819
·
IF 3.917
Fang Kuanjun,Xie Ruyi,Liu Xiuming,Zhao Gaojie,Han Dongmei,Chen Weichao,Shi Zhen,Hao Longyun,Cai Yuqing
Abstract The low utilization of dyestuff in textile coloration leads to serious environmental pollution and wasting of resources. Dye/polymer nanospheres have high absorbing, reflecting and scattering light properties due to the large specific surface area, the regular shape, and the uniform size. In the present study, we report the reactive dye/poly(styrene-butyl acrylate-trimethyl ammonium chloride) composite nanosphere as a highly efficient colorant for cationic cotton fabrics. The dye contents of the four colored nanospheres can reach to 217–404 mg/g. The hydration diameters of the composite nanospheres are 83–101 nm for four different reactive dyes. They have the negative zeta potentials, approximately − 25.3 to − 37.6 mV. The reactive dye/copolymer nanospheres exhibit much more powerful coloration ability for cotton fabrics and higher dye utilization than the ordinary reactive dyes. The color depths of cotton fabrics dyed with colored nanospheres are 2.8, 4.9, 10.6 and 4.2 times of the values of the corresponding dye colored samples. The dye/copolymer nanospheres have much larger color gamut than the ordinary dyes. The color durability and levelness of the dye/copolymer nanospheres on cotton fibers are good enough for practical applications. What’s more important is that the residual dye/copolymer nanospheres in the dye bath can be reused in the next dyeing process. This novel nanosphere dyeing method does not only save the colorants but also avoid the discharging of colored sewage. Graphical abstract The reactive dye/poly(St-BA-VBT) nanospheres were successfully fabricated by adding the cationic poly(St-BA-VBT) nanospheres dispersions into reactive dye solutions. This article offered a novel dyeing method for cotton fabrics using dye/poly(St-BA-VBT) nanospheres. These colored nanospheres can endow the cotton fabrics with good color performance and avoid the discharging of colored waste water, which provide a green way for textile coloration.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yi-Fan Jiang,Cheng-Zong Yuan,Xiao Zhou,Ya-Nan Liu,Zhi-Wei Zhao,Sheng-Jie Zhao,An-Wu Xu
The design of inexpensive, efficient, durable and self-supported bifunctional electrodes for simultaneously catalyzing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte is essential for renewable energy conversion processes and future sustainable development, however, it still remains a challenging issue. Reported herein is the first example of selenium phosphorus co-doped cobalt oxide nanosheets on highly conductive Co foil collector (CoOSeP@Co foil), fabricated by successively selenylation and phosphorization of a pre-oxidized Co foil, as a novel bifunctional electrode for water electrolysis. Due to the improved intrinsic catalytic activity of cobalt oxide derived from doping and the strong interaction between active CoOSeP nanosheets and highly conductive Co foil collector, the designed CoOSeP@Co foil integrated electrode displays favorable catalytic activities towards both HER and OER in strongly alkaline media, achieving an electrocatalytic current density of 10 mA cm −2 at a low overpotential of 155 mV for HER and 347 mV for OER, respectively. Beyond that, the electrode could keep working and maintain its catalytic activity for at least 30 h. Furthermore, an alkaline electrolyzer constructed by employing CoOSeP@Co foil as an integrated bifunctional electrode in both the cathode and anode can generate 10 mA cm −2 at a cell voltage of 1.74 V and shows good long-term stability of more than 30 h. This work not only opens a new avenue to improve the intrinsic catalytic activity of materials by co-doping with heteroatoms , but also brings us a new idea for designing other cost-effective, self-supported, efficient and robust overall water splitting electrodes.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Yongli Shi,Jintao Xue,Yajun Sang,Xiaoqing Xu,Qing Shang
The purpose of this study was developing a novel hydroxypropyl methyl cellulose- co -polyacrylamide- co -methacrylic acid (HPMC- co -PAM- co -PMAA) hydrogel, which was used as rectal suppository to regulate the blood glucose of diabetes. HPMC- co -PAM- co -PMAA hydrogel was fabricated via free-radical polymerization. Fourier transform infrared spectroscopy (FTIR) and Raman spectra were used to confirm the fabrication of HPMC- co -PAM- co -PMAA hydrogel. Their inner morphology was observed with scanning electron microscope (SEM). The extracts of hydrogel were applied to study their cell viability . The hypoglycemic effects of insulin (INS)-loaded HPMC- co -PAM- co -PMAA hydrogels were investigated by rectal administration. FTIR and Raman spectra confirmed the obtaining of HPMC- co -PAM- co -PMAA hydrogels. Many micro-pores were found in the SEM photograph of HPMC- co -PAM- co -PMAA hydrogels. Cell experiments indicated that HPMC- co -PAM- co -PMAA hydrogel was out of cytotoxicity. In vitro release profiles showed that INS-loaded hydrogel could release INS at a continuous manner in pH 7.4 buffer (rectal conditions). Animal experiments suggested that INS-loaded hydrogel had an obvious hypoglycemic effect. Therefore, as a convenient and economic method of administration, INS-loaded HPMC- co -PAM- co -PMAA hydrogels could be used as rectal suppositories to regulate blood glucose.
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PubMed
高影响因子
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