JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-11
·
IF 2.8
Zhang Zhengyu,Yang Yujie,Chen Congliang,Chen Dongyang,Zhang Yingming,Meng Yuting,Li Hao
In this study, Ni–Zn–Co ferrite doped with (Al 3+ ) was synthesized by solid-phase synthesis method and its structure was analyzed. By analyzing the X-ray diffraction (XRD) data, it was explained that the Ni 0.45 Zn 0.40 Co 0.15 Fe 2-x Al x O 4 (0 ≤ x ≤ 0.15) ferrite has a single-spinel structure with FD-3 m space group. Additionally, by analyzing the XRD data, it is found that the lattice constant is the largest when Al 3+ is undoped. The range of lattice constant is (8.3751 ~ 8.3900) Å, the range of saturation magnetization ( M s ) is (68.77 ~ 79.39) emu/g, and the range of coercivity ( H c ) is (9.04 ~ 13.10) Oe. When the content of Al 3+ is 0.09, the permeability reaches the highest. In conclusion, the results obtained indicate that this ferrite is suitable for low-frequency electronic devices and also confirm that Fe 3+ was successfully replaced with Al 3+ . This paper provides a new idea for the study of spinel-structured ferrites by doping Al 3+ .
研究领域:
材料科学
·
固体物理
·
磁学
✓ 已验证
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 9
·1189-1197
·
IF 3.1
Luo Yanrong,Lu Chunlan,Zhang Xiaolin,Zhan Shiping
With the widespread use of hydrogels, injectable hydrogels for the human body require higher safety and non-toxicity. The most important is the choice of cross-linking agent to be green. In this study, acylated chitosan macromolecular crosslinkers (MCS) were prepared by maleic acid (MA) and chitosan (CS). Its structure was confirmed by FTIR and 1 H NMR and its degree of acylation was also determined. Then, a series of polymeric network hydrogels were investigated. The cross-linked copolymer poly( N -isopropyacrylamide-maleic acid copolymer)/acylated chitosan P(NIPAM- co -MA)/MCS is a series of thermosensitive hydrogels formed by free radical polymerization of NIPAM and MA with MCS as cross-linking agent. The apparent morphology, thermosensitive transition point, and hydrophilicity were investigated. The results show that the hydrogel has a homogeneous pore structure inside. The optimal low critical solution temperature (LCST) was 36.66 ℃. In addition, with the increase of maleic acid content, the water contact angle of the hydrogel is smaller, that is, the hydrophilic effect is better. The results indicate that the P(NIPAM- co -MA)/MCS hydrogels were synthesized successfully and may be a potential material for biomedical, drug delivery, or absorption application. This study can provide a certain research basis and relevant theoretical basis for clinical practice. Graphical abstract
研究领域:
高分子科学
·
材料科学
·
生物医学工程
·
药物制剂技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaofeng Wang,Chengcheng Zhang,Zuyi Zhang,Yaoming Gai,Qingbo Li
The interface site between metal and support possess unique electronic and morphological structure, providing distinct active centers for favorable reaction in catalytic conversion of biomass derivatives to valuable chemicals. In this study, a series of Cu-Co/CeO x catalysts were prepared for hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF) via reduction of the corresponding layered double hydroxide precursors. The characterizations indicated the formation of CoCe-Vö interface (Vö denotes oxygen vacancy) and the effect of hydrogen spillover from Cu species to CoCe-Vö interface. Furthermore, the experiments and theoretical calculations verified that CoCe-Vö interface could activate the C O bond. The optimized catalyst showed a DMF yield of > 90% at 180 °C and 1.5 MPa H 2 with no deactivation in the cycling tests. This study reveals the interfacial effects of the nanocatalysts, including the oxygen vacancies and hydrogen spillover, on hydrogenolysis of HMF, which provided a simple and efficient approach for synthesis of high-performance non-noble metal nanocatalysts applied to the hydrogenolysis of various biomass derivatives.
研究领域:
催化化学
·
生物质转化
·
纳米材料科学
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Dangcheng Su,Yuanhua Xiao,Yingliang Liu,Shengang Xu,Shaoming Fang,Shaokui Cao,Xuezhao Wang
2D MXenes (transition metal carbides, Ti 3 C 2 T x ) with large surface area and metallic conductivity are widely used as supporters in catalysts. Unfortunately, the single MXene sheets would deteriorate in the presence of oxygen and water, which is almost the same as the environment of oxygen reduction reaction (ORR). Herein, an “armor” was constructed to encapsulate the oxidizable MXene by a confined in-situ oxidative polymerization strategy, employing the electrostatic interaction between the exfoliated MXene sheets (negatively charged) and oxidant (Fe 3+ , positively charged). The ultra-dispersed binary Fe 3 N and Co sits coupled with the large surface area MXene supporter synergy to endow more exposed active sites, meanwhile, the density functional theory (DFT) studies reveal that a moderate binding strength between the intermediates and the binary active sites was effectively modulated to enhance the ORR performance. The synthesized Fe 3 N/Co–N–C@MXene exhibits an impressive half-wave potential (E 1/2 , 0.871V) and a lower Tafel slope of 52.56 mV dec −1 than that of Pt–C-20% (74.89 mV dec −1 ). The Fe 3 N/Co–N–C@MXene based ZAB exhibits a four times higher peak power density (189.16 mW cm −2 ) than the Pt–C-20% based ZABs and superior cycle stability within 320 h. Furthermore, the assembled flexible ZABs shows high flexibility and stability in different bending scenarios.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源存储与转换
·
功能材料
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 83
·期 4
·841-853
·
IF 1.915
Li Dongmei,Li Wenjie,Zhang Quan,Wang Yizhi,Lin Hongyu,Feng Li,Li Shaoxiu,Deng Yue,Xiao Qiurong,Chen Jiongxi,Dong Qi
The promising synergistic electrocatalytic system of phosphate (PO 4 3− ) with the mediator cobalt(II) (for short E-Co(II)-PO 4 3− ) was employed to degrade cationic dye methylene blue (MB). The exploration in the electrocatalytic process revealed that the main intermediate active oxidation products were Co(III), accompanied with hydroxyl radicals and peroxodiphosphates (P 2 O 8 4− ). Their synergistic electrocatalytic degradation rate to MB and total organic carbon (TOC) was up to 100 and 60% in 40 min, respectively, which was 5 times and 2.6 times that in a direct electrocatalytic system, correspondingly. The degradation process of the E-Co(II)-PO 4 3− system on MB started with the bond being broken at the N-C junction of the MB molecule and intermediate active oxidation substances being generated, such as phenothiazine, 2-amino-5-(N-methylformamide) benzene sulfonic acid and N 1 ,N 1 -dimethyl-1,4 diaminobenzene. Then, the intermediates were degraded into aniline, phenol and benzene sulfonic acid, and eventually decomposed into inorganic substances like CO 2 and water. The electrocatalytic degradation mechanism of E-Co(II)-PO 4 3− system on MB was the combination of indirect oxidation of the intermediate oxidants like Co(III), P 2 O 8 4− and the hydroxyl radical with direct electrocatalysis on the platinum titanium electrode, where the electrocatalytic oxidation of Co(III) was dominant. Active Co(III) and peroxodiphosphate generated in a novel electrocatalytic system have synergistic electrocatalytic effect. MB removal rate reached 100% in 40 min in the novel electrocatalytic system with phosphate and the mediator cobalt(II). Co(III) is the dominant active oxidation substance in MB oxidation and mineralization.
研究领域:
环境化学
·
电催化
·
环境污染与控制
·
高级氧化技术
·
环境功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xing Qian,Chong Xu,Yiqing Jiang,Jie Zhang,Guoxiang Guan,Yixuan Huang
Multi-shelled micro-/nanomaterials with complex hollow structures have been regarded as a promising kind of advanced catalysts for energy conversion owing to their large specific surface, increased active sites, and shortened paths of charge transfer. Herein, a series of double-shelled transition metal chalcogenides (Ni-Co-MoS x , Co-MoS x , and Ni-MoS x ) with ball-in-ball hollow structures have been synthesized by converting corresponding metal-glycerol spherical precursor with the assistance of (NH 4 ) 2 MoS 4 under a facile solvothermal condition. In this process, (NH 4 ) 2 MoS 4 acted as a multifunctional vulcanizator, which could conveniently afford Mo and S elements at the same time, and the mass ratio of the precursor to (NH 4 ) 2 MoS 4 played an indispensable role in preparing the uniform hollow sphere with satisfactory morphology and catalytic performance. Noteworthily, compared with ternary Co-MoS x and Ni-MoS x , the quaternary Ni-Co-MoS x ball-in-ball nanospheres demonstrated much enhanced catalytic properties in accelerating the reduction of triiodide in dye-sensitized solar cells (DSSCs) and the electrochemical hydrogen evolution reactions (HERs) due to the advantages of multi-elements, moderated surface texture, and larger surface area. Specifically, a prominent power conversion efficiency of 9.63% was achieved by the DSSC assembled with Ni-Co-MoS x counter electrode (CE), which was much superior to that of Pt CE (8.28%). Besides, Ni-Co-MoS x showed a low η 10 of 93.4 mV and a small Tafel slope of 55.0 mV dec −1 when employed as electrocatalysts for HER in 0.5 M H 2 SO 4 .
研究领域:
材料科学
·
能量转换
·
催化
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peidong Hong,Zijian Wu,Dandan Yang,Kaisheng Zhang,Junyong He,Yulian Li,Chao Xie,Wu Yang,Ya Yang,Lingtao Kong,Jinhuai Liu
Singlet oxygen ( 1 O 2 ) is an electrophilic species that has great selectivity for breaking down electron-rich refractory organic pollutants. However, in most cases, 1 O 2 plays a minor role in the Fenton-like process due to its low yield, the contributions of which are usually covered by free radicals. Here, we provide the first report on a type of hollow amorphous Co/C composites prepared for the efficient generation of 1 O 2 to degrade oxytetracycline (OTC) selectively in the Fenton-like system. The optimized Co/C samples (Co/C-3) obtained the best degradation performance of OTC near to 100% under neutral conditions, along with satisfactory reusability and stability. Additionally, it exhibited a high anti-interference capacity for inorganic anions and natural organic matter s in the different water qualities. XPS spectrum revealed that the electron cycle of ≡Co 2+ -O-C/H and ≡Co 3+ -O-C/H played a vital effect on the formation of 1 O 2 . Quenching experiments and EPR testing further verified that 1 O 2 converted from ·O 2 – was the dominant oxidative species, and no hydroxyl radical (·OH) appeared in this reaction. Moreover, the results of the Fukui function and T.E.S.T (Toxicity Estimation Software Tool) analysis provided significant assistance in the exploration of degradation pathways and ecological risks of OTC and its intermediates.
研究领域:
环境科学
·
材料科学
·
污染控制
✓ 已验证
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2016
·
IF 1.299
Yangyi Chen,Jie An,Qi Zhong,Peter Müller-Buschbaum,Jiping Wang
The smart control of cotton fabric comfort by cross-linking thermo-responsive random copolymer is investigated. The monomers 2-(2-methoxyethoxy) ethoxyethyl methacrylate (MEO2MA) and ethylene glycol methacrylate (EGMA) with a molar ratio of 17:3 are selected to synthesize the thermo-responsive random copolymer poly(2-(2-methoxyethoxy) ethoxyethyl methacrylate-co-ethylene glycol methacrylate), abbreviated as P(MEO2MA-co-EGMA). By using citric acid as a cross-linking agent, the obtained P(MEO2MA-co-EGMA) is successfully immobilized onto cotton fabrics. Smart control is achieved from the thermo-responsive behavior of the copolymer. Cross-linked P(MEO2MA-co-EGMA) will collapse when the ambient temperature exceeds its transition temperature. Therefore, the formerly compact P(MEO2MA-co-EGMA) layer will switch to a porous structure, and the air/moisture permeability of the textiles is enhanced. As the comfort of the textiles is closely related to the air/moisture permeability, a smart control of the cotton fabric comfort can be realized. In addition, the softness of cotton fabrics with and without thermo-responsive polymers does not show a prominent change, even when the applied solution concentration is as high as 16% (wt%). On the contrary, the stiffness of the cotton fabric coated with poly(N-isopropylacrylamide) (PNIPAM) is significantly higher than the original cotton fabric, indicating that homo PNIPAM is less suitable for textiles used in daily lives. Moreover, the whiteness and mechanical properties are studied and stay unchanged after cross-linking. As a consequence, the introduction of P(MEO2MA-co-EGMA) into textiles can provide textiles with smart control of cotton comfort, and it will not influence the wearabilities of the textiles.
研究领域:
纺织科学
·
聚合物化学
·
材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Bingjie Wang,Jun Li,Jianqiang Zhang,Huyan Li,Peng Chen,Qun Gu,Zongbao Wang
Acetylated chitin nanocrystals were prepared through surface modification, and biodegradable poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/chitin nanocrystals films were produced via solution-casting method. Transmission electron microscopy observations and X-ray diffraction profiles revealed that the rod-like morphology and crystal structure of chitin nanocrystals were maintained. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy results showed that the hydroxyl groups were partly replaced by the acetyl groups on the surface of chitin nanocrystals. The hydrophobic performance of the acetylated chitin nanocrystals was significantly increased according to the contact angle measurements. Differential scanning calorimeter results indicated that the influence of chitin nanocrystals on the crystallization behaviors of PHBV matrix was changed from suppression to assistance after the surface modification. Tensile test showed that the tensile strength and Young's modulus of PHBV/acetylated chitin nanocrystals composites were improved by 44% and 67%, comparing to the improvement of 24% and 43% for PHBV/chitin nanocrystals composites with the addition of 5.0 wt.% nanocrystals into PHBV.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4439-4448
·
IF 2.817
Huang Xiangjin,Li Jianwen,Xie Chunsheng,Zhang Huasheng,Wei Shoulian,Lai Wenfeng,Xian Shaoling,Huang Sicong
Herein, a nanocomposite comprising polyvinyl pyrrolidone (PVP) and cobalt(II) hydroxide (Co(OH) 2 ) nanoparticles (PVP–Co(OH) 2 ) was synthesized via a hydrothermal method and used for detection of Cu(II) ions. Using PVP grafted nanosized Co(OH) 2 as a surfactant could decrease the aggregation and reduce the particle size. The conducted morphology investigations showed that PVP–Co(OH) 2 nanocomposite was composed of small spherical particles with a diameter of 40–80 nm that could accelerate mass diffusion and favor the deposition-stripping process of Cu(II) ions. High catalytic activity of Co(OH) 2 and good affinity of PVP to Cu(II) ions synergistically enhances sensing performance of the PVP–Co(OH) 2 nanocomposite-modified electrode than Co(OH) 2 - and PVP-modified electrodes. A linear response was obtained for Cu(II) ion concentration over a range of 1.0–90.0 μg/L, with a detection limit of 0.26 μg/L (S/N = 3). The proposed electrode exhibited good performance in terms of selectivity, stability, and reproducibility. It was also employed to detect Cu(II) ions in water and food samples, and the results were in good agreement with those obtained by graphite furnace atomic absorption spectrometry.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Jinshi Dong,Ting Li,Shengtong Li,Panpan Chang,Qianqian Jin,Jiaqiang Yang,Zhuangzhuang Lai
CO and C3H8, as typical inorganic and organic gaseous pollutants, respectively, require distinct oxidation catalysts for efficient conversion due to their unique properties. In this work, Pt catalysts with different crystal phases of TiO2 (anatase and rutile) as supports were fabricated and investigated for CO oxidation and C3H8 combustion. The surface nature of TiO2 dramatically affects the local environment and electronic properties of supported Pt. Pt-TiO2(R) exhibited superior activity for CO oxidation, whereas Pt-TiO2(A) showed higher reactivity for C3H8 total oxidation. It is concluded that Pt-TiO2(R) contains more oxygen vacancies at the interfacial Pt perimeter sites than Pt-TiO2(A) after reduction pretreatments, which facilitates CO oxidation through the Mars–van Krevelen (MvK) mechanism. The electron-deficient Pt in Pt-TiO2(A) promotes the adsorption and activation of C3H8, and the amount of charge transfer between Pt and adsorbate intermediates during C3H8 oxidation determines the preference of C-C cleavage or dehydrogenation. Lower charge transfer in Pt-TiO2(A) makes C–C cleavage more efficient and contributes to the total oxidation of C3H8. This work emphasizes the importance of engineering material’s local environment and electronic structure to design high-performance oxidation catalysts.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xinyu Huo,Jinxing Gu,Baomin Luo,Fengyun Su,Yezhen Zhang,Dan Zhang,Ruili Shi,Bingxuan Qiao,Yixin Wang
Direct ethanol fuel cells (DEFCs) have received widespread attention due to their simple construction, low operating temperature, high conversion efficiency, high energy density, and being free of pollution. The sluggish kinetics, low C 1 pathway selectivity, and poor resistance to CO poisoning, however, remain great challenges for their development. In this work, porous PtBiTe nanoplates (PtBiTe NPs) with an average lateral size of 309.5 nm and an average thickness of 14.6 nm were facilely synthesized in aqueous solution at room temperature by using Bi 2 Te 3 nanoplate templates. The twodimensional porous structure exposes a large number of Pt active sites and has excellent structural stability. The introduction of Bi and Te modifies the electronic structure of Pt, weakens the energy barrier of the potential-determining step of the C 1 pathway, reduces the energy barrier of CO oxidation, and decreases the number of oxidized Pt atoms. PtBiTe NPs show excellent activity and stability, high C 1 pathway selectivity, and robust resistance to CO poisoning toward ethanol oxidation reaction in alkaline electrolyte, much superior to the commercial Pt/C catalysts.
研究领域:
电化学
·
纳米催化
·
能源材料
·
表面科学
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）