Small
·
2025
·Vol. 21
·期 15
·2412473
·
IF 12.1
Xinyu Zhu,Minghao Fang,Bozhi Yang,Shaorou Ke,Meiling Zhan,YuanMeng Wang,Shujie Yang,Xin Li,Yanghong Li,Xin Min
Facing the complex application environment and overall inefficiency in the complete water-splitting process, the development of highly efficient and stable catalytic materials is urgently required. This study innovatively proposes and for the first time implements a rapid synthesis technique driven by microwave-induced sulfur sublimation, successfully preparing MS 2 /RuS 2 (M = Co, Fe, Ni) heterostructure interfaces with high structural stability and uniform active site distribution within merely 60 s. By incorporating iron-group sulfides, the electronic structure of pyrite-type RuS 2 is effectively modulated, enabling the developed MS 2 /RuS 2 @G catalyst to exhibit superior activity in alkaline environments. Particularly, the cobalt-based sulfide regulated pyrite-type RuS 2 (CoS 2 /RuS 2 @G) achieves a mass activity in the hydrogen evolution reaction (HER) that is 15.4 times that of 20 wt.% Pt/C, and in the oxygen evolution reaction (OER), it surpasses commercial IrO 2 by two orders of magnitude. This research not only provides a new pathway for enhancing the performance and environmental adaptability of water-splitting catalysts but also presents a simple and universal method to boost catalytic activity through a synergistic modulation strategy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 33
·15525-15533
·
IF 3.3
Xiao-Lan Wei,Qin-Lin Shi,Lan Jiang,Yu Qin
Fluorescent carbon dots (CDs) with narrow emissions have been mostly prepared at high temperatures and high pressures, with long reaction times and tedious purification processes, which greatly limits their large-scale production. In contrast, the microwave-assisted solvothermal method can produce CDs simply and rapidly, but often results in wide-emissive CDs with full widths at half maximum (FWHM) larger than 80 nm. In this study, the microwave synthesis of CDs was improved by using ethylene glycol as the solvent and sodium thiosulfate as the oxidant. Consequently, narrow emissive CDs with a FWHM of only 35 nm were obtained from phloroglucinol, and were purified by simple precipitation using a mixed solvent of ethanol and dichloromethane. The structural characterization studies of the obtained CDs reveal that the sulfur element could be doped in the carbon structure with the addition of thiosulfate. It was also demonstrated that the photoluminescence efficiency of the CDs is greatly determined by their carbon core structures and edge groups. In addition, the fluorescence of CDs could be tuned significantly from the blue region to the green region by changing the dispersing solvent. Accordingly, the prepared CDs were successfully applied for the sensing of water content in organic solvents.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 8
·3543-3551
·
IF 9.931
W. Zheng,P. Zhang,J. Chen,W. B. Tian,Y. M. Zhang,Z. M. Sun
To stabilize the layer structures of MXenes, carbon nanotubes (CNTs) have been successfully grown in situ by a facile microwave irradiation method under ambient conditions. The synthesized composites based on various MXenes including Ti3C2, Ti2C and V2C exhibited hybrid structures with uniformly distributed multi-walled CNTs anchored on the layer structured MXene networks. Benefiting from the unique structural features, these composites exhibit excellent electrochemical properties as anode materials in lithium ion batteries. The CNTs@Ti3C2 composite exhibits high reversible capacities of 430 mA h g−1 at 1 A g−1 and 175 mA h g−1 at 10 A g−1 (31.25 C), and is not only better than the pristine Ti3C2 (99 mA h g−1 and 45 mA h g−1, respectively), but also superior to the recently reported MXene composites. The impressive electrochemical performance is attributed to the synergetic effects of the connective CNT bridges, large-capacity metal/metal oxides and the fine conductive MXene matrix. This in situ growth strategy of CNTs shows great potential in modulating the structure and properties of nanomaterials for advanced applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jianglong Deng,Lintao Chen,Hao Chen,Jiazhuang Guo,Cai-Feng Wang,Su Chen
Carbon dots (CDs) have attracted increasing attention due to their remarkable optical characteristics and broad application prospects. Here, we report an efficient and mild strategy for the rapid preparation of green-emissive CDs (G-CDs) via a microwave-assisted approach. The G-CDs were synthesized via microwave-assisted thermal treatment of m-phenylenediamine (m-PD) and phthalic acid in ethylene glycol for 10 min, followed by purification. The resultant G-CDs exhibit a bright green photoluminescence (PL) centered at 515 nm with an absolute quantum yield (QY) of 66.5%. Structural characterization revealed that the G-CDs possess a highly graphitized carbon core and are enriched with various surface functional groups. Mechanistic studies on fluorescence indicated that the green emission of G-CDs originates from the interaction between the surface-attached green fluorophore, phenazine-2,7-diamine (2,7-DAP), and the graphitized carbon core. In addition, the prepared G-CDs/polyvinylpyrrolidone (G-CDs/PVP) composite film exhibits excellent optical properties and was successfully applied in the fabrication of green light-emitting diodes (LEDs). This study might promote the understanding of the fluorescence mechanism and the development of preparation methods for high-performance G-CDs based on m-PD.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Xiaotian Xie,Yi Xu,Fanshu Yuan,Qi Wu,Pengchao Liu,Jie Liu,Dongtian Wang,Tingting Lv,Qianli Zhang
The strategic design of in situ grown nanomaterials with microdendrite morphology to enhance supercapacitor performance has become a significant research focus in the field of renewable energy storage. This study explores an innovative one-step microwave technique for producing different NiSe microdendrite arrays that are grown in situ on Ni foam (NF) substrates. In this process, Ni foam serves dual roles as a Ni source and a structural framework. At a current density of 0.6 A g −1 , NiSe microdendrite arrays that were synthesized demonstrate a capacity of 261.1 mAh·g −1 , surpassing that of the majority of traditional pseudocapacitive materials. Furthermore, the effect of the solvent, Se powder dosage, and microwave reaction parameters on the micromorphology and electrochemical properties of NiSe is comprehensively examined. Furthermore, the supercapacitor device featuring a positive electrode composed of NiSe microdendrite arrays and a negative electrode constructed from activated carbon (AC) exhibits a broad voltage range of 1.7 V. It also achieves a peak energy density of 50.29 Wh·Kg −1 at power density of 847.98 W kg −1 , suggesting a promising application prospect.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jie Zhu,Chunxing Wu,Yongmei Cui,Dongxiang Li,Yaojun Zhang,Jie Xu,Chunfang Li,Shahid Iqbal,Meiwen Cao
The impurity of unpurified carbon quantum dots (CQDs) severely limits their application. In this paper, CQDs synthesized by ultrafast microwave hydrothermal method from L -cystine were purified by both dialysis and direct phase-transfer. The as-obtained CQDs in basic aqueous reaction mixture show excitation-independent fluorescence around 505 nm with a maximum excitation at 421 nm and pH-responsive emission intensity. However, after purification by dialysis the CQDs display excitation-dependent blue fluorescence from 410 to 500 nm with respect to the excitation from 310 to 430 nm. Particularly, the CQDs purified by direct phase-transfer into various organic solvents show two strong blue fluorescence peaks respectively focusing on 422–434 nm and 400–410 nm with a maximum excitation at 370–372 nm. The quantum yield of the CQDs decreases to 45.1% after a purification by dialysis from the original 82.7%, while it decreases to 57.5% after a purification of phase-transfer. The CQDs extracted in organic solvents are demonstrated to be pure small crystalline-carbon nanoparticles with chemically surface-grafted groups, while the dialyzed CQDs will physically adsorb additional L -cystine, sodium and by-product nitrate ions. The difference of surface state and solvent environment of these CQDs shall contribute to the different fluorescence property. Such strong luminescent , pure CQDs in organic solvents should have obvious advantages in further applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 38
·5787-5796
·
IF 3.474
Hualan Xu,Bo Xu,Ran Liu,Xinwei Li,Siqi Zhang,Chuying Ouyang,Shengliang Zhong
In this paper, a fast and facile microwave method is described to prepare monoclinic ScP04·2H2O flowerlike superstructures constructed by well-aligned nanorods without use of any template or surfactant. By varying the preparation parameters, such as reactant ratio, microwave power and reaction time, various morphologies, such as nanospheres, cubes and particles were obtained. The growth process of the flowerlike microstructure was also investigated. A nanorod growth and self-assembling process was involved in the formation of the flowerlike superstructure. After calcining the ScP04·2H2O microflowers at 800 °C, tetragonal ScP04 with similar morphology was obtained. Tb3+, Eu3+, Dy3+, Tb3+/Eu3+ and Eu3+/Dy3+ doped ScP04·2H2O were also prepared and their photoluminescent properties investigated. By adjusting the relative doping concentration, multicolor tunable emission of green, red and blue could be realized and the decay time results reveal that energy transfer occurs. More significantly, white light could be achieved in a 3% Eu3+ and 2% Dy3+ co-doped ScP04·2H2O. First-principles calculations were carried out to study the structural and electronic properties, which were in accordance with the experimental observations.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 45
·39150-39158
·
IF 3.289
Chiyao Bai,Meicheng Zhang,Bo Li,Xiaosheng Zhao,Shuang Zhang,Lei Wang,Yang Li,Ji Zhang,Lijian Ma,Shoujian Li
Recently, research into functional materials with various desired properties has been ceaselessly promoted. However, the development of convenient and practical strategies for building flexible material platforms to realize multi-functionalization and to prepare various functional derivatives is still a challenge. Herein, we propose for the first time a new strategy that introduces conjugated carbon–carbon triple bonds into the skeleton of covalent organic frameworks (COFs) that can act as both building blocks and active sites to create a versatile platform. Based on the platform, in situ multipurpose functionalization according to diverse real needs can be achieved more easily and efficiently with different addition reactions, compared with current approaches used for the preparation of functional materials. In this paper, a novel COF material (TCD), which contains diynes acting as a skeleton of the material platform, was directly prepared under microwave irradiation. Then, three new functional materials with a cyano group (TCD-CN), an amidoxime group (TCD-AO) and a hydroxyl group (TCD-OH) were obtained by further functionalization of the CC bonds in TCD. The capabilities of the prepared materials for the selective separation of uranium from a simulated nuclear industrial effluent were examined, and TCD-AO was found to exhibit the highest separation efficiency.
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
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 15
·4519-4525
·
IF 7
Chaoran Wang,Xiao Li,Shiyue Liu,Tingting Wang,Puxu Liu,Xiaowei Song,Zhiqiang Liang
Silicoaluminophosphate (SAPO) zeolites with small pores (8-ring window), such as SAPO-34, SAPO-17, and SAPO-RHO, have attracted a lot of attention due to their unique structural features, and their applications in the field of small-molecule gas adsorption and separation. However, the fast, efficient and green synthesis of SAPO zeolites remains a great challenge. In this work, SAPO-17 zeolites were synthesized within 1 min for the first time by a seed-assisted microwave method, and the resulting samples possessed excellent performance in the application of CO2 adsorption and separation for flue gas and natural gas. The microwave-assisted route can shorten the crystallization time of traditional hydrothermal methods from a few hours to 30 min. Furthermore, the crystallization time could be drastically shortened to 1 min with the addition of seeds, which represents the shortest time for the preparation of a SAPO-17 zeolite up to now. SAPO-17 synthesized within 1 min (SAPO-17-S-1) possessed the smallest crystal size, and the largest micropore volume and specific surface area among all the samples, which enhanced mass transfer and exposed more active sites, and thus it possessed prominent performance for CO2 adsorption (3.47 mmol g−1 at 273 K and 1 bar) and gas separation. At 298 K and 100 kPa, SAPO-17-S-1 exhibited the highest gas selectivity for CO2/N2 (276) and CO2/CH4 (63) over the other samples, which were synthesized in a relatively long time. Transient binary breakthrough experiments on SAPO-17-S-1 further verified the highly-efficient gas separation performance. This work proposes a green and ultrafast strategy for the synthesis of SAPO-17 zeolites with highly selective CO2 adsorption over N2 and CH4.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2011
·Vol. 11
·期 9
·7794-7801
·
IF 1.352
Zhang Wei,Wang Qiao,Qin Fan,Zhou Huamin,Lu Zhong,Chen Rong
Palladium nanoparticles (NPs) were successfully synthesized via a rapid and facile microwave route in HEPES (2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid) buffer solution. The shape- and size-controlled Pd nanoparticles could be obtained by one-step method without dependence
of seed-mediated growth. The capping agent plays a key role in the formation of Pd NPs with different shape and size, which could be tuned by varying capping agents such as polyvinylpyrrolidone (PVP), cetyltrimethylammonium bromide (CTAB), sodium citrate (Na3(cit)) and potassium
bromide (KBr). The size-dependent catalytic activities of the obtained Pd NPs for Suzuki coupling reaction were also investigated. It demonstrated that the catalytic activity of Pd NPs was enhanced regularly with the decrease of particle size. Pd NPs less than 10 nm exhibited better catalytic
activities for Suzuki reaction than the commercial Pd/C catalyst. Pd/MWCNTs and Pd/SBA-15 nanocomposites were also prepared by a facile method and afforded good catalytic activity and reusability. This "green" synthetic protocol could be used as a general method for the rapid synthesis of
transition metal nanoparticles.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
DOI
PubMed
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Wufeng Wu,Jiang Fan,Dongyue Wang,Yali Zhao,Xinglei Zhao,Yanying Wei
MOF membranes exhibit impressive performance in gas separation due to their large surface area, controllable pore size and unique affinity. Here, the ultrathin UiO-66-NH 2 polycrystalline membranes with thickness of ∼320 nm are successfully prepared within 1 h using a combination of ultrasound-assisted and microwave synthesis strategies. During the reaction, high-density small MOF nuclei are produced by sodium formate ultrasound-assisted, which act as sufficient nucleation sites for heterogeneous nucleation during membrane growth, aiming for development of a continuous MOF membrane on the porous substrate. The obtained UiO-66-NH 2 membrane shows an ideal CO 2 /CH 4 selectivity of 40 due to the enhanced the interaction between CO 2 molecules and the membrane. Moreover, the narrowed pore structure further hinders the diffusion of larger-sized molecules owing to -NH 2 occupying the pore channels, resulting in elevated CO 2 /CH 4 selectivity. Compared to many other MOF membranes, the UiO-66-NH 2 polycrystalline membranes exhibit a well balance of gas permeance and CO 2 /CH 4 selectivity, which presents a new route for CO 2 capture.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yongshun Liang,Lang Xu,Ya Li,Jie Ding,Yiyao Li,Kaijiao Duan,Wei Bai,Junming Guo,Mingwu Xiang
Layered Ni-rich oxides LiNi x Co y Mn 1-x-y O 2 (x ≥ 0.6, x + y = 1) are considered the best promising cathode material for high-performance lithium-ion secondary batteries. However, the time-consuming and complicated preparation process of spherical precursors greatly increases the consumption of energy and time, whilst suffering the challenges of liquid waste and Li uniform distribution. Herein, a simple microwave liquid phase flameless combustion method with the advantages of time-saving and energy-conservation has been proposed to synthesize Ni-rich LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM 622 ). The NCM 622 powders with uniform element distribution are obtained by heating the liquid mixture of raw materials in a simple domestic microwave oven only for 5 minutes and without waste liquid production. Subsequently, the microwave-synthesized NCM 622 powders are further calcined in high-temperature with different temperatures and time in order to obtain the final products with high crystallinity and good electrochemical performances. As a result, the optimal NCM 622 cathode material calcined at 800 °C for 14 h exhibits excellent irregular polyhedral morphology and low degree of Li + /Ni + mixing, whilst displays high first discharge capacity of 179.1 mAh g −1 and 204.9 mAh g −1 with the capacity retention of 88.21 % and 81.36 % (100 cycles) in 3–4.3 V and 3–4.5 V (0.2 C), respectively.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）