ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Zhongying Liu,Yihai Zhou,Liangjun Yang,Renchun Yang
The preparation of high-efficiency photocatalysts by green and mild methods is very attractive for photocatalysis field. Here, TiO 2 /Ti 3 C 2 was prepared by in-situ oxidation with a green method, in which only water or H 2 O 2 was used. A heterojunction interface formed between the anatase phase TiO 2 and the Ti 3 C 2, which was demonstrated by HRTEM and XRD. Fluorescence spectra and i-t transient photocurrent are used to study the separation efficiency of photogenerated electron-hole pairs. The close contact between Ti 3 C 2 and TiO 2 speed up the separation of photo-generated electron-hole pairs, promoting a higher hydrogen production performance around 2520.4 μmol·g −1 ·h −1 on TCT-1.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Zichun Ding,Siying Wang,Runze Liu,Yuhang Wang,Jianing Guo,Xuedong Wu,Jiaming Wang,Xigao Jian,Lishuai Zong,Jinyan Wang
Phthalonitrile (PN) resin is renowned for its absence of small molecule release during curing, high processing stability, and exceptional thermal stability, positioning it favorably in the realm of high-temperature resin applications. However, its narrow processing window and high melting point present challenges to its development and practical use. To address these limitations, this work synthesized PN prepolymers 4,4′-bis (sulfonylbiphenyl) thiophtalonitrile (BSPS) and 4,4′-bis(carbonylbiphenyl) thiophtalonitrile (BSPC) by introducing thioether bonds as a substitute for ether bonds, aiming to expand the prepolymers' processing window. Meanwhile, building upon the oxidation process of thioether to sulfone observed in pharmaceutical production, the potential for in-situ oxidation of thioether bonds during the curing of phthalonitrile prepolymers was investigated. A comprehensive analysis of the curing behavior, viscosity changes, and thermal stability was conducted using differential scanning calorimetry (DSC), rheological analysis, and thermogravimetric analysis (TGA). The DSC and rheological test results reveal that the experimental group prepolymers BSPS and BSPC exhibit lower melting points (BSPS 179 °C; BSPC 180 °C) and broader processing windows (BSPS 52 °C; BSPC 79 °C) than blank. Additionally, the thermal performance of resins show improvement over the blank, with BSPS achieving a decomposition temperature of up to 530 °C ( T d5% ). XPS analysis of the curing process confirmed that the enhanced thermal stability is attributable to the partial oxidation of thioether bonds into stable sulfone groups. This innovative structural approach allows for satisfactory processing performance in the initial stage, followed by a spontaneous transformation into a more robust and thermo-resistant structure post-shaping. This finding carries significant implications for the development of a balanced phthalonitrile system that harmonizes processing ease with superior thermal endurance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ze Yang,Songding Guo,Zhenglai Huan,Yongbing Zhu,Tingting Zhang,Shangyi Li
In this study, we dexterously constructed a unique in situ interface oxidation–adsorption dual-reaction platform through the self-excitation of ferrate (Fe(VI))/peroxymonosulfate (PMS) for phenylarsonic acid (PAA) and inorganic As(V) removal. When the molar ratio of Fe(VI)/PMS was 1:2, 80% degradation of PAA could be achieved within 180 min and the apparent constant value of the reaction rate ( k obs ) would reach up to 0.185 min −1 . 1 O 2 and Fe(IV) were the main active species for degradation of PAA in Fe(VI)/PMS reaction system. In addition, we explored the possible degradation intermediates and pathway of PAA. In situ Fe(III) oxides generated from Fe(VI) decomposition could adsorb arsenic pollutants through ligand exchange with inorganic As(V) through surface hydroxyl groups to form Fe-O-As bonds. The effect of coexisting anions on the removal performance of the system was investigated, and the results showed that the presence of PO 4 3− and CO 3 2− promoted the oxidative degradation of PAA owing to the activation of PMS by PO 4 3− and CO 3 2− , but Cl − can inhibit the PAA degradation through a free radical scavenging mechanism. PO 4 3− and SiO 3 2− affected the adsorption and removal of the released inorganic As(V) due to their competitive adsorption of in situ Fe(III) oxides. Density functional theory (DFT) calculations indicated an obvious electron transfer (1.83 e) between the in situ Fe(III) oxides and inorganic As(V) with a high adsorption energy of −10.30 eV. These results indicate that the combination of Fe(VI) and PMS can effectively control the total arsenic (total-As) in water bodies.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 16
·165403
·
IF 2.9
Yitong Guo,Qixun Xia,Yukai Chang,Libo Wang,Aiguo Zhou
In this work, a new MoO3@Mo2CTx nanocomposite was prepared from two–dimensional (2D) Mo2CTx MXene by in situ oxidization in air, which exhibited wonderful lithium-storage performance as anodes of lithium–ion batteries (LIBs). The precursor Mo2CTx was synthesized from Mo2Ga2C by selective etching of NH4F at 180 °C for 24 h. Thereafter, the Mo2CTx was oxidized in air at 450 °C for 30 min to obtain MoO3@Mo2CTx nanocomposite. In the composite, in situ generated MoO3 nanocrystals pillar the layer structure of Mo2CTx MXene, which increases the interlayer space of Mo2CTx for Li storage and enhances the structure stability of the composite. Mo2CTx 2D sheets provide a conductive substrate for MoO3 nanocrystals to enhance the Li+ accessibility. As anodes of LIBs, the final discharge specific capacity of the MoO3@Mo2CTx composite was 511.1 mAh g–1 at a current density of 500 mA g–1 after 100 cycles, which is about 36.7 times that of pure Mo2CTx MXene (13.9 mAh g–1) and 3.2 times that of pure MoO3 (159.9 mAh g–1). In the composites, both Mo2CTx and MoO3 provide high lithium storage capacity and can enhance the performance of each other. Moreover, this composite can be made by a facile method of in situ oxidation. Therefore, the MoO3@Mo2CTx MXene nanocomposite is a promising anode of LIB with high performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2018
·Vol. 14
·期 12
·1703453
·
IF 9.598
Caiyan Gao,Guangming Chen
Although composites of organic polymers or n-type small molecule/carbon nanotube (CNT) have achieved significant advances in thermoelectric (TE) applications, p-type TE composites of small organic molecules as thick surface coating layers on the surfaces of inorganic nanoparticles still remain a great challenge. Taking advantage of in situ oxidation reaction of thieno[3,4-b]pyrazine (TP) into TP di- N -oxide (TPNO) on single-walled CNT (SWCNT) surface, a novel synthesis strategy is proposed to achieve flexible films of TE composites with narrow-bandgap (1.19 eV) small molecule coating on SWCNT surface. The TE performance can be effectively enhanced and conveniently tuned by poly(sodium- p -styrenesulfonate) content, TPNO/SWCNT mass ratio, and posttreatment by various polar solvents. The maximum of the composite power factor at room temperature is 29.4 ± 1.0 µW m −1 K −2 . The work presents a way to achieve flexible films of p-type small organic molecule/inorganic composites with clear surface coating morphology for TE application.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiang Lv,Tianhe Wang,Wei Jiang
We report a novel method to prepare translucent and stable Ag@AgCl/g-C 3 N 4 /TiO 2 ceramic films having strong photocatalytic activities and self-cleaning capabilities under light irradiation. Colloidal silica was used as an inorganic binder and P25 TiO 2 was added as a hydrophilicity enhancer without which a smooth coating was not achievable. Ag@AgCl of particle size around 30 nm, was synthesized by in-situ oxidation of nano-silver particles in porous g-C 3 N 4 /TiO 2 films. Optimal conditions for Ag@AgCl/g-C 3 N 4 /TiO 2 preparation in terms of strongest photocatalysis were established by tests on Rhodamine B degradation under visible and full spectral irradiations. A good adhesion strength of the porous films on glass substrate was achieved. Stability and reusability of the films were assessed by cycling tests. Possible photocatalytic mechanisms are proposed based on the basis of trapping experiments. Systematic characterization of the film suggests that the in-situ oxidation is an effective and practical method to produce nanoscale Ag@AgCl.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 11
·6475-6481
·
IF 10.733
Ruiyi Han,Peiyi Wu
Separation membrane with laminar structure, assembled by two-dimensional materials, has been widely explored to achieve precise molecular separation and high water permeability in the field of water purification. Herein, a novel GO-based nanofiltration membrane intercalated with TiO2 nanoparticles was fabricated by the in situ oxidation of MXene nanosheets. The formation of TiO2 nanocrystals, derived from the oxidation of MXene, created additional channels for water permeation. Particularly, the consecutively distributed TiO2 nanocrystals acted as intercalators owing to their laminar structure and created continuous nanochannels within GO membrane for water transport, which shows great advantages over the membrane prepared using traditional methods. Water permeability of the obtained membrane reached 89.6 L m−2 h−1 bar−1, which is 7.3 times that of pristine GO membrane and 2.4 times that of GO/TiO2 membrane fabricated using traditional methods. The rejection rate for four different organic dyes is above 97%. The highly improved water permeability with no obvious sacrifice of rejection rate was attributed to the presence of continuous nanochannels obtained via the in situ oxidation of MXene without destroying the intrinsic stacking structure of GO sheets. This study offers a novel strategy to fabricate continuous nanochannels within the separation membrane with a two-dimensional laminar structure.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Tungsten
·
2023
·
IF 6.6
Fu Yi-Han,Peng Yuan-You,Zhao Lei,He Tian-Qi,Yuan Mei-Mei,Dang Hao,Liu Rui,Ran Fen
Vanadium nitride (VN) has received significant attention as a potential negative electrode material due to its remarkable theoretical and physical properties. However, the electrochemical performance needs to be improved due to its low specific surface area and the issue of being easily dissolved in electrolyte. Researches have shown that the composite structure of carbon-coated nanoscale VN particles could significantly increase the specific surface area of VN, and more importantly, and the carbon matrix can effectively restrain the dissolution of VN particles in the electrolyte, thereby improving its chemical and electrochemical performance, including specific capacity and cycling stability. Herein, VN quantum dots are synthesized and protected by uniformly coating the carbon skeleton on its surface via an in situ strategy of oxidation initiation, which initiates dopamine polymerization, forming a crystalline complex of polydopamine and vanadium. After heat treatment, the product is a composite material with VN quantum dots embedded in the amorphous carbon skeleton. The resulting small-sized and crosslinked carbon particles formed a graded pore structure, more reasonable channels provided for electrolyte ions transport quickly. When the composite material was used as the negative electrode material for supercapacitors, it exhibits the specific capacity of 391.9 F·g −1 at a current density of 0.5 A·g −1 and excellent capacity retention rate of 83.6% after 5000 cycles. The synthesis method of this quantum dot could be applied to other metal compounds and has potential applications in catalysis, environmental protection, and other fields.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 11
·1703279
·
IF 9.598
Qian Wang,Minghui Yang,Zhen-Bo Wang,Chao Li,Da-Ming Gu
Shuttle effect of the dissolved intermediates is regarded as the primary cause that leads to fast capacity degradation of Li–S battery. Herein, a microporous carbon-coated sulfur composite with novel rambutan shape (R-S@MPC) is synthesized from microporous carbon-coated rambutan-like zinc sulfide (R-ZnS@MPC), via an in situ oxidation process. The R-ZnS is employed as both template and sulfur precursor. The carbon frame of R-S@MPC composite possesses three kinds of pores that are distinctly separated from each other in space and are endowed with the exclusive functions. The central macropore serves as buffer pool to accommodate the dissolved lithium polysulfides (LPSs) and volumetric variation during cycling. The marginal straight-through mesoporous, connected with the central macropore, takes the responsibility of sulfur storage. The micropores, evenly distributed in the outer carbon shell of the as-synthesized R-S@MPC, enable the blockage of LPSs. These pores are expected to perform their respective single function, and collaborate synergistically to suppress the sulfur loss. Therefore, it delivers an outstanding cycling stability, decay rate of 0.013% cycle −1 after 500 cycles at 1 C, when the sulfur loading is kept at 4 mg cm −2 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zhimin Jia,Xiaofeng Li,Jie Zhang,Ningning He,Honghan Long,Yingdi Zou,Yingdan Zhang,Bo Jiang,Yue Qi,Yang Li,Lijian Ma
Two-dimensional (2D) covalent organic nanosheets (CONs) are layered crystalline porous polymers comprising periodically extended graphene-like structures, and have great application potential in membrane separation field due to the advantages of abundant optional monomers , tunable pore size and structure, facilely-tailored functionality and pre-designed properties. However, unlike graphene oxide (GO) membranes, it is hard to directly prepare 2D CON membranes by vacuum filtration because of the difficulties in preparation of ultra-thin, large-sized and well-dispersed 2D CONs. Herein, an improved buffering interlayer interface method was proposed to realize a facile one-step synthesis of GO-like CON oxides by using H 2 O 2 as an in-situ oxidant in the buffer layer . The stereoscopic fulcrum-oxygen sites introduced into the structure of CONs lead to weaken interactions between CON layers and increased hydrophilicity, which contributes to subsequent preparation of monodisperse nanosheets. The membranes fabricated with the as-prepared monodisperse nanosheets can realize high-efficiency transport of metal ions with a precise charge-discriminated group separation ability and efficient ion rejection. The strategy of in-situ oxidation to prepare monodisperse CONs proposed in this study provides a valuable approach for the preparation of novel functionalized CONs and the achievement of fast membrane separation performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 47
·34606-34610
·
IF 3.9
Jianfeng Qiu,Yanping Liu,Minxian Cao,Luqi Xie,Yongkun Liu,Hongwen Li,Junqiang Lu,Qifeng Liang,Jiaqi Pan,Chaorong Li
The MoS2/MoO3 nano-heterojunction photocatalyst was synthesized via the in situ oxidation sintering method. The properties of the samples were characterized by XRD, SEM, EDX, TEM, UV-vis, PL, FT-IR, BET and electrochemical techniques. The MoS2/MoO3 nano-heterojunction (MS-400) exhibited significantly better photocatalytic activity toward Rhodamine B degradation (0.42634 h−1) than monomer MoS2 (∼8.0-folds) and MoO3 (∼25.6-folds). This is mainly attributed to the MoS2/MoO3 heterojunction interface having an appropriate potential gradient that can promote the interface carrier transportation/separation to optimize the carrier efficiency and increase the solar absorption and specific surface areas/active sites via microstructures.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Fanyun Su,Qi Meng,Xiaojian Liu,Wan Yang,Yanxi Chen,Juan Yang,Jingjing Tang,Hui Wang,Yayun Ma,Xiangyang Zhou
With the annual increase in lithium-ion batteries (LIBs) disposal, valuable resources are being generated with worrying waste, so it is strategically important to recover the critical metals from them. Individual high temperature or leaching processes do not apparently achieve very satisfactory results. In the present work, the reduction with zinc powder was able to convert the lithium in LiNi x Co y Mn z O 2 (NCM) to soluble LiOH, while the reduction and ammonia complexation environment generated by the decomposition of cysteine (Cys) achieved an efficient leaching of transition metals without additional additives. The leaching efficiency of Li can reach more than 92 %, while that of Ni/Co/Mn reaches more than 97 % through the regulation of the parameters of each process. In particular, an in-situ redox mechanism is proposed to explain the efficient leaching of transition metals, which further enriches the theory of spent LIBs recycling and provides a promising idea for various hydrometallurgical extraction systems.
研究领域:
环境科学
·
冶金工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）