JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liwen He,Zongmin Li,Yuan He,Xinjie Tao,Bizhou Lin,Jun Chen,Qiao Huang,Dongya Sun
The study of electrochromic materials has far-reaching significance for the regulation of light and heat as well as the reduction of energy consumption. In this study, rGO-Co-NiO composite films were prepared by combining graphene oxide , which has excellent conductivity and stability, with Co-NiO films. The particle size, band gap, conductivity and response time of the electrochromic films were improved by precisely adjusting the component modulation amount of graphene oxide. The results show that with the incorporation of GO it is easy to form oxygen vacancies , which is conducive to ionic conduction and diffusion, in which the film with a GO doping concentration of 4 % has excellent performances in terms of response time and coloring efficiency, and the response time is reduced from 10.2 to 5.8 seconds, and it still possesses 57.25 % of the light modulation amplitude after 600 cycles, of which the attenuation rate is only 2 % for the period from 100 to 600 cycles, The coloring efficiency after 100 cycles is 48.21 cm 2 /C. In summary, the investigated rGO-Co-NiO composite films have a broad potential for future application in electrochromic devices .
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DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Fengbo Zhu,Shanhao Feng,Zequn Wang,Zhichao Zuo,Shilei Zhu,Wenwen Yu,Ya Nan Ye,Meng An,Jin Qian,Zi Liang Wu,Qiang Zheng
Polyelectrolyte (PE) hydrogels are ubiquitous in nature. Tailoring the interactions between PE gels and salt provides versatile implements to overcome their critical drawbacks such as weak and brittle nature. Adding salts to PE gels introduces both counterions and co-ions, and the variations of PE chain conformations and their macroscopic properties have been mainly attributed to the interplay between PE charged groups and their counterions, yet the role of co-ions is generally ignored. This work demonstrates that by changing co-ion species with larger atomic sizes, monovalent haloids are capable of triggering the phase separation of common poly(acrylic acid) single network (PAAc-SN) hydrogels into polymer-sparse and polymer-rich regions, accompanied by remarkable enhancement in strength and toughness. The capabilities of co-ions inducing phase separation of PAAc-SN gels follow a reverse Hofmeister series: Cl– < Br– < I–. Due to the enhanced polymer–polymer interactions and viscoelastic energy dissipation, the phase-separated PAAc-SN gels exhibit exceptional mechanical properties, with fracture stress and tearing energy of 96.7-folds and 1636-folds larger than those of the as-prepared gels, respectively. The largest fracture stress and tearing energy reach 8.8 ± 1.3 MPa and 29.8 ± 2.4 kJ/m2, exceeding most state-of-the-art PE hydrogels. A combination of FTIR, 1H NMR, and all-atom molecular dynamics simulations reveals that the reverse Hofmeister series-aided phase separation originates from changes of network chain conformation through the following influences rooted in the larger size of co-ions: (i) enhancing hydrophobic polymer–polymer interactions; (ii) accelerating the ion pair formation between carboxyl groups and their sodium counterions. These results not only provide a new method for hydrogel strengthening and toughening but also emphasize the significant role of co-ions in tuning the properties of PE gels.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jun-Shuai Zhang,Wei-De Zhang
Developing earth-abundant H 2 -production heterogeneous photocatalysts with robust activity and stability has attracted great interests. Herein, a low-cost photocatalyst was prepared by binding nickel complex covalently from primary amines of chitosan (NiL) onto photosensitive carbon nitride nanosheets (CN) through electrostatic interaction. Introduction of NiL results in more efficient utilization of solar energy, photogenerated electrons’ direct transfer and lower overpotential for water reduction. The optimized NiL3-CN photocatalyst shows the highest H 2 evolution rate of 346 μmol g −1 h −1 under visible light irradiation and exhibits high stability during test. This work presents great potentials for sustainable conversion of solar energy, and sheds positive light on the development of heterogeneous photocatalysts via anchoring H 2 -evolving molecule catalysts confined by inexpensive macromolecules onto a semiconductor photosensitizer through a facile and valid method.
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高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·4834-4843
·
IF 9.5
Guo Zhiren,Zhang Xiao,Li Xinyuan,Cui Chang,Zhang Zilei,Li Hansheng,Zhang Dongxiang,Li Jinying,Xu Xiyan,Zhang Jiatao
Photocatalytic oxidation techniques are promising for degradation of the highly ecotoxic and refractory isothiazolinone bactericides in relevant industrial wastewaters. However, low charge separation and directional transport efficiency under solar light radiation restrain their practical application. Here, we report a nanostructured photocatalyst doped with Gd and B in TiO 2 with carbon incorporation and defect formation through incomplete calcination. The specific surface area, grain size, and hydrophilicity of TiO 2 are improved, which is beneficial for the interfacial reaction between the photocatalyst and pollutants. The reduction of the bandgap, the broadening of the photo-absorption range, and the retarded electron-hole recombination promote the photocatalytic performance due to the improved oxygen vacancies based on the electron distribution modification. The difference in partial density of states (ΔPDOS) between the current catalyst and raw TiO 2 indicates that the co-doping of Gd and B with incomplete calcination changes the electronic hybridization of conduction band and valence band near the Fermi level, and affects the band gap energy. It improved charge separation and directional transport efficiency and benefited the formation of main active species, including OH and O 2 − , for the pollutant decomposition. The rate of photocatalytic removal of benzisothiazolinone (BIT) by the current photocatalyst reaches 1.25 h −1 , being 4.31 times that of TiO 2 . The current work offers a constructive approach to the design and synthesis of nanostructured photocatalysts for the photocatalytic degradation of refractory organic pollutants.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xiaowei Guo,Yang Yuan,Shanshan Li,Jingwen Wang,Zhengyu Bai,Lin Yang
Owing to the unique geometric and electronic structure, design and synthesis of electrocatalysts with well defined heterointerfaces are essential for clean energy technologies, for instance water-splitting and Zn-air batteries. Herein, a bifunctional electrocatalyst assembled by Co/MnO nanoparticles and nitrogen doping double-sphere carbon (denoted as Co/MnO@N-DSC), was fabricated via a solvothermal and pyrolysis strategy. The Co/MnO@N-DSC catalysts exhibit an enhanced bifunctional oxygen electrocatalytic performance for Oxygen reduction reaction (ORR) (E 1/2 , 0.84 V vs . RHE) and oxygen evolution reaction (OER) (E onset , 1.54 V vs . RHE). As an air cathode catalyst, the Co/MnO@N-DSC-based Zn-air battery can afford prime performance, over the commercial noble-metal-based Zn-air battery. Theoretical calculation results indicate that the synergism of Co (111)/MnO (200) heterointerfaces can enhance charge transfer and provide extra electrons for the reaction processes. This work provides a promising manoeuvre to uplift bifunctional catalytic activity by increasing the synergy from heterointerfaces of transition-metal/metal oxide in oxygen electrocatalysis .
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Yao Tian,Chunmei Zeng,Shiyu Yang,Yang Luo,Lunhong Ai,Jing Jiang
Development of efficient and economical non-precious metal catalysts for dehydrogenation of ammonia borane is an important way to store and release hydrogen. Vacancy-engineered defective catalysts with modulated electronic structure allow ideal adsorption and dissociation of reactant molecules for the optimized catalytic activity. In this study, we report a facile synthesis of cobalt-defective Co 3 O 4 (V Co -Co 3 O 4 ) nanocatalyst by the calcination of layered cobalt glycerate as a key precursor. The stacked cobalt-oxygen sheets and interlayer bound glycerate anions in a layered structure are favorable for introducing cation vacancy during calcination process. The obtained V co -Co 3 O 4 exhibits outstanding catalytic activity for the hydrolysis of ammonia borane, along with a high hydrogen production rate of 934 mL min −1 g Cat -1 and a low activation energy of 32.65 kJ mol −1 . The catalytic performance of the V Co -Co 3 O 4 catalyst can be well maintained for consecutive five cycles. The current study establishes a new example of cation vacancy strategy to facilitate the hydrolysis of ammonia borane for hydrogen generation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Qianmin Ma,Meng Zhang,Chi Yao,Yaping Du,Dayong Yang
Lanthanide (Ln)-based supramolecular hydrogels are a new category of smart optical materials, which are promising for applications in chemistry sensors, bioimaging agents and light-emitting devices. Herein, we report a supramolecular hydrogel with tunable and responsive luminescence, which is based on the assembly of Ln and deoxyguanosine (dG, one of the units of DNA). ESI-TOF-MS, NMR, FTIR, PXRD and simulation results verify the formation of dG/Ln hydrogels. dG/Tb hydrogel emits strong green luminescence, while dG/Eu hydrogel is nonluminous; when Tb is co-doped into dG/Eu, surprisingly we find that co-doped dG/Tb/Eu hydrogel displays tunable luminescence from green, orange to red by simply regulating the stoichiometric ratio of Tb and Eu. A cascade luminescence resonance energy transfer mechanism (from dG to Tb, and to Eu) is proposed in this co-doped system, which is confirmed by luminescence decay curves and emission spectra. Subsequently, luminescence switch is designed based on reversible responsiveness of hydrogel upon Ag + /L-Cys, temperature and pH stimuli via dynamic supramolecular coordination. Our work provides a new route to construct multicolor functional materials.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 3
·1005-1014
·
IF 2.5
Han Song,Wang Yanqing,Xu Yanru,Wu Jinlong
Bulk polytetrafluoroethylene (PTFE) foam is a great potential oil–water separation material, owing to the high hydrophobicity and lipophilicity property. However, the technique of fabricating PTFE foam with low cost, controllable porosity and high mechanical strength remains an urgent requirement due to its high chemical inertness induced limitation. A kind of bulk PTFE foam material is prepared by cold pressing co-sintering method, employing sodium chloride (NaCl) as pore forming agent. SEM measurements reveal that the size and distribution of pore structure are mainly determined by the particle size and content of NaCl, because the migration and diffusion behaviors of PTFE particles suffer from more inhibition induced by increased NaCl particles during sintering. The PTFE foam with uniformly distributed pore structures can be obtained from composite mixed with 70 wt% NaCl and 30 wt% PTFE, with a low thermal conductivity as low as 0.069 W/(m K). With the decrease of PTFE content in raw composite, the density and mechanical properties of PTFE foam gradually declines. However, the tensile strength remains as low as 0.2 MPa, with an elongation rate of 21%, which guarantees the required mechanical strength avoiding being broken when use as a bulk oil absorption material. Remarkably, the PTFE foam shows a strong hydrophobicity, with a mean water contact angle of 137°, and with a mean surface roughness of 4.41 μm. It exhibits separation efficiency larger than 99% in 30 cycles, with separation flux larger than 4000 L/m 2 /h within 15 cycles, indicating excellent recyclability and stability. The PTFE foam sample also shows desirable continuous separation performance for oil/water mixture. The proposed bulk PTFE foam with low manufacturing cost and stable chemical and mechanical properties will provide data and theoretical support for the material applied in oil/water separation and thermal-protective coating.
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高影响因子
Journal of Coatings Technology and Research
·
2024
·Vol. 21
·期 3
·879-892
·
IF 2.3
Kuang Guankun,Liu Yan,Qin Ying,Lu Tianhao,Xin Binjie
Acrylic acid is commonly used to modify anionic waterborne polyurethanes, and little research has been done on the modification of cationic waterborne polyurethanes. In this study, the effect of acrylic acid addition at different levels on the performance of cationic waterborne polyurethanes was investigated. The experimental results showed that the stability, and chemical resistance of cationic waterborne polyurethane coatings were improved with the addition of acrylic acid, which has the advantages of better chemical resistance, high stability and low price, and the hardness of the coating gradually increased and the adhesion decreased with the increase of acrylic acid content, therefore, the acrylic acid content of 21% was the most suitable. In addition, the effect of amino acids as neutralizing agents on the performance of cationic waterborne polyurethane coatings was also explored. The addition of amino acids helped the cationic waterborne polyurethane to form a reticular crosslinked structure, and the experimental results showed that the mechanical properties of the cationic waterborne polyurethane coatings were greatly improved. Compared with the commonly used acids (hydrochloric acid and acetic acid), amino acids have the advantage of being environmentally friendly and non-toxic, which is more conducive to the industrial production and application of cationic waterborne polyurethane coatings.
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高影响因子
ChemNanoMat
·
2021
·Vol. 8
·期 1
·e202100392
·
IF 3.154
Qingchuan Du,Shumin Shi,Lida Zhang,Zhongyuan Yan,Xu Zeng,Jingjing Wu,Weixin Zhou,Zhen-Dong Huang,Titus Masese,Yanwen Ma
Separators are key components that physically separate and chemically connect the anode and cathode to guarantee the safety and cycle stability of batteries. Herein, based on the building concept of a bird's nest, we have developed separators comprising SiO 2 nanowires reinforced with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). In particular, the hybrid separators with 39% of PVDF-HFP exhibit much enhanced tensile strength, Young's moduli, flexibility, and elongation as a result of a strong crosslink effect, compared to bare SiO 2 nanowire separator, while yet maintaining excellent electrolyte wettability, high ionic conductivity, and wide electrochemical window. Moreover, the hybrid separators also demonstrate excellent thermal stability and dendrite suppression capability. Lithium metal batteries assembled using the hybrid separators with LiFePO 4 as the cathode achieve excellent rate performance and cyclic stability. The discharge capacities attained at a current density equivalent to 0.2 C and 2 C rate are 157 and 126 mAh g −1 , respectively. A capacity of 99 mAh g −1 is still maintained at 2 C rate after 500 cycles. This study illuminates SiO 2 nanowires reinforced with PVDF-HFP as promising separators for high-energy, high-power and safe lithium batteries.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Linli Tan,Na Han,Longfei Zhang,Zhenyu Cui,Wei Li,Xingxiang Zhang,Jun Cai
ABSTRACT In this study, a melt processable poly(acrylonitrile-co-methyl acrylate)(P(AN-MA)) copolymer was used as membrane matrix, caprolactam (CPL) and glyceryl triacetate (GTA) were used as an eco-friendly mixed diluent. P(AN-MA) membranes with inter-connected sponge structure and porous surface were successfully fabricated via thermally induced phase separation (TIPS). The optimum ratio of CPL/GTA in the mixed diluent was 1:1 wt.%. Even though the concentration of P(AN-MA) was up to 25 wt.%, the surface of membrane still exhibited microporous structure. When the concentration of P(AN-MA) was 15 wt.%, the membrane formed in 20 °C air bath showed the highest water flux of 6802 L/m 2 h. With the increasing of copolymer content or cooling rate, the pore size decreased. In addition, all of the P(AN-MA) membranes exhibited a rejection to carbon ink more than 90 wt.%. The average pore size of the membranes was less than 270.5 nm, and the tensile strength was more than 2.8 MPa. It is anticipated that the facile and green technology TIPS will bring the P(AN-MA) membrane a step closer for practical applications, including clean-up of oil spills, waste water treatment, fuel purification, and separation of commercially relevant emulsions.
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ChemistrySelect
·
2024
·Vol. 9
·期 17
·e202401101
·
IF 1.9
Xiangming Hu,Zhenyu Yang,Mingyue Wu,Yuntao Liang,Wei Wang,Fusheng Wang,Qian Zhang,Jingran Mao,Ning Yang,Xuwei Wang
Graphical This paper selectes MBioFs with copper ions as the metal center to design an MBioFs/PANI composite suitable for CO gas sensors. The morphology and nanostructure of the prepared materials were thoroughly analyzed, followed by testing their gas-sensing properties. Subsequently, the gas sensing mechanism of composite materials was proposed and discussed in detail. In addressing the issue of poor gas sensitivity in semiconductor CO sensor materials used in mining, such as pure PANI. This study utilized an ice-water bath in combination with an in-situ polymerization method to synthesize a new composite material consisting of Cu(II)-racemic glutamate nanofibers and PANI. The morphology, structure, and chemical bonds of the composite material were analyzed using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and spectral analysis. The material's ability to detect CO (100–500 ppm) at room temperature was investigated, revealing a response value of up to 6.8 % for 400 ppm CO detection when the composite material was deposited on a ceramic interdigital electrode. The material exhibited good selectivity and responsiveness to CO detection at room temperature, attributed to the heterojunction formed between Cu(II)-racemic glutamate nanofibers and PANI, which enhanced carrier migration. Consequently, the Cu(II)-racemic glutamate nanofiber/PANI composite(Cu(II)-RGlu/PANI) material shows promise as a high-performance sensing material for CO detection at room temperature and as a low-power, integrable sensor material for underground coal mines. This research contributes to the development of a theoretical framework for such applications.
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高影响因子
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