TETRAHEDRON
·
2018
·
IF 2.377
Jie Zhu,Wenhui Zhu,Ping Xie,Charles U. Pittman,Aihua Zhou
A novel and efficient Ni-catalyzed aryl- and alkyl-selenation of imidazo[1,2-α]pyridines employing selenium powder has been developed for the first time. The significant advantages of this protocol are that it is an inexpensive nickel catalyst and exhibits broad functional-group compatibility and good reaction yields.
✓ 已验证
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2025
·
IF 2
Yisong Yang,Sha Chen,Zhishun Wei,Ying Chang,Yan Xiong,Junxiang Zhao,Hu Zhu,Min Li,Qirui Yang,Guoqiang Yi
This study proposes a method involving stirring after a constant-temperature water bath in a salt solution to enhance the crystal size, overall homogeneity, and hydration strength of α-hemihydrate gypsum (α-HH). Utilizing by-product gypsum from the chlor-alkali industry as raw material, the influence of Mg 2+ ions on phase evolution and final morphology was systematically investigated. During the constant-temperature water bath process in salt solution, the neutral MgSO 4 0 ion pairs formed by Mg 2+ and SO 4 2- facilitated the dissolution of dihydrate gypsum (DH) while amplifying the solubility difference between α-HH and DH, thereby promoting preferential crystallization and precipitation of α-HH. Furthermore, Mg 2+ inhibited crystal growth along the c-axis direction during α-HH development, effectively reducing the aspect ratio. The subsequent stirring process significantly increased secondary nucleation probability, enabling mutual adhesion among α-HH crystals of varying dimensions. This synergistic process ultimately yielded enlarged α-HH crystals with an average particle size of 143.21 μm and aspect ratio of 5.57. The flexural strength and absolute dry compressive strength of bulk samples prepared from these α-HH crystals are discussed in detail, demonstrating substantial improvements in mechanical properties compared to conventional preparation methods.
✓ 已验证
产品关联
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2025
·
IF 3.7
Yaqi Fu,Siyu Mao,Tianyue Liao,Wei Feng
The enzyme OleT can utilize H 2 O 2 as the co-substrate, and this biocatalysis is an H 2 O 2 -driven enzymatic catalysis. In this work, OleT was recombinated by being fused to an elastin-like polypeptide (ELP). The recombinant enzyme OleT-ELP exhibits higher stability and resistance to H 2 O 2 interference compared to native OleT. OleT-ELP showed improved catalytic efficiency in producing α-olefins via fatty acid decarboxylation. The recombinant 5-hydroxymethylfurfural oxidase ( HMFO-ELP) catalyzes the oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA), generating H 2 O 2 as a byproduct. Combining OleT-ELP with HMFO-ELP enabled simultaneous conversion of fatty acids and HMF. The in situ H 2 O 2 generated by HMFO-ELP was transferred to OleT-ELP, enhancing catalytic efficiencies for both α-olefins and FDCA production.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2025
·
IF 14.1
Zhuo Chen,Tianyu Liu,Irfan Ismail,Fan Qian,Lianping Zhang,Shutao Yang,Xiaoke Zhang,Lingpeng Yan,Yunfei Han,Qun Luo,Yongzhen Yang,Chang-Qi Ma
The conductivity of AgNWs electrodes can be enhanced by incorporating Ag grids, thereby facilitating the development of large-area flexible organic solar cells (FOSCs). Ag grids from vacuum evaporation offer the advantages of simple film formation, adjustable thickness, and unique structure. However, the complex 3D multi-component structure of AgNWs electrodes will exacerbate the aggregation of large Ag particles, causing the device short circuits. To address this issue, the relationship between the surface energy of modification layers and the morphology and conductivity of ultrathin Ag on AgNWs is studied. The amorphous ZnO (α-ZnO) layer promotes Ag growth from Volmer–Weber (VW) to Frank–Van der Merwe (FM), reducing particle aggregation. The 1 µm thick PET/AgNWs/Ag grid electrode with α-ZnO exhibited low contact resistance and high conductivity. As a result, 1 cm 2 FOSCs with Ag grids achieve a power conversion efficiency (PCE) of 16.01%. As the area increased to 4 and 9 cm 2 , the performance of the monolithic FOSCs is 14.70% and 12.69%, showing less efficiency loss during upscaling. The 8 and 16 cm 2 modules constructed by series and parallel connection of the monolithic devices yield PCEs of 14.47% and 12.92%, respectively. This study offers valuable insights into constructing Ag grids on AgNWs electrodes for highly efficient large-area FOSCs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Mingxia Wu,Chang Chen,Shaowu Jiu,Yanxin Chen,Yan Liu
Salt gypsum (SG), a by-product derived from the salt manufacturing process, poses considerable challenges for efficient reuse owing to its elevated moisture and salt content. In this study, an innovative methodology was developed utilizing an oil-bath reaction unit to synthesize α-calcium sulfate hemihydrate (α-HH) from untreated SG in a sodium chloride (NaCl) solution, with the objective of achieving environmentally sustainable production. The influence of NaCl concentration, the type and content of transcrystallizing agents, reaction temperature, reaction duration, and stirring rate on the transformation process, crystal morphology, and mechanical strength of α-HH was systematically examined. The crystal morphology and chemical composition of the resultant α-HH products were meticulously characterized through XRD, SEM, EDS, FT-IR, and TG-DSC. The findings revealed that under optimized conditions (15 wt% NaCl solution, a reaction temperature of 115°C, a reaction duration of 2.0 h, a stirring rate of 200 rpm, and 0.20 wt% sodium succinate as a crystal modifier), the conversion efficiency of α-HH attained 80.90 %, accompanied by a compressive strength of approximately 31.93 MPa post-drying. NaCl induced a transformation in crystal morphology from flaky to long columnar, whereas sodium succinate further refined the morphology from long columnar to short columnar via physical adsorption mechanisms. This study proposes a high-value strategy for the valorization and recycling of industrial by-product gypsum, thereby broadening the application scope of SG and significantly enhancing its overall utilization efficiency. This approach is of paramount importance for advancing the green and sustainable development of the salt chemical industry.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Huan-huan Fan,Wei Su,Jing-zhi Wu,Wen-long Liu,Chu-an Lin,Qing-yun Li,You-yan Liu,Ai-xing Tang
This study addresses challenges in the chemoenzymatic epoxidation of α-pinene, such as lipase deactivation, carrier decomposition in acidic environments, and product ring-opening side reactions, by developing a core-shell structured metal-organic framework (MOF)-based immobilized enzyme catalyst, CALB@ZIF-8@Zn-BTC. Candida antarctica lipase B (CALB) was encapsulated into ZIF-8 channels via in situ encapsulation. Trisodium citrate was introduced to accelerate the aggregation and co-precipitation of ZIF-8, while 1,3,5-benzenetricarboxylic acid (H₃BTC) coordinated with surface zinc ions of ZIF-8 to form a core-shell composite with enzyme protection and acid-buffering functionalities. Experimental results demonstrated that sodium citrate significantly enhanced acid scavenging capacity, suppressing acidic side reactions and achieving 96.6 % epoxidation selectivity. The Zn-BTC shell improved ZIF-8 stability in acidic systems, retaining over 60 % activity after 7 cycles. Under optimized conditions (3.35 mol/L ethyl acetate, 0.5 mol/L H₂O₂, 0.1 g sodium citrate), α-pinene conversion reached 83.1 %. Compared to the commercial catalyst Novozym435, CALB@ZIF-8@Zn-BTC exhibited superior catalytic efficiency, selectivity, and reusability. Structural characterization (FESEM, EDS, nitrogen adsorption) confirmed enhanced mass transfer and stability due to the composite’s unique architecture and uniformly distributed sodium citrate. This work provides an innovative solution for green and efficient α-pinene epoxidation and offers theoretical and practical insights for designing MOF-based catalysts in acidic environments.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Hao Zhang,Weiping Yang,Wenjing An,Kai Yu,Shuangxi Liu,Lan-lan Lou
The development of highly efficient and recyclable bifunctional photoredox catalysts is extremely promising for organic synthesis. In this study, a novel kind of bifunctional metal-organic framework (MOF) based catalysts were prepared through the in-situ incorporation of the L -proline moiety into the MOF network and followed by the anchoring of dye molecules via a solvothermal process. These catalysts exhibited versatile catalytic activity in the visible light triggered α -alkylation of aldehydes and cross-dehydrogenative coupling reactions between N -aryl tetrahydroquinolines and ketones. The control experiments revealed enhanced synergy existed between the two kinds of catalytic active centers confined in the porous framework, resulting in significantly enhanced catalytic activities while maintaining comparable enantioselectivities to the corresponding homogeneous catalytic systems. Furthermore, the bifunctional catalysts showed high stability and reusability over five consecutive cycles with only a slight decrease in activity. Based on the experimental results, a plausible reaction mechanism over the present bifunctional catalyst was proposed.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2017
·
IF 0.963
Ru Meng,Yutong Chen,Xiufang Zhang,Xiaoli Dong,Hongchao Ma,Guowen Wang
The polydopamine (PDA) coating α-S hydrophilic composites (SD) were fabricated by a self-assembly process for enhanced α-S photocatalytic performance under visible light. The XRD patterns analysis indicated that we had successfully prepared the orthorhombic α-S. The SEM, FT-IR and TGA showed that PDA had been successfully coated on α-S. The photocatalytic ability was illustrated by the DRS and FL. Moreover, the measurement of the water contact angle of SD and the corresponding original α-S (SA) showed the hydrophilicity of α-S had been improved. The photocatalytic ability of SD and SA was evaluated by photocatalytic decomposition of Methylene blue (MB) solution. The MB elimination rate with SD in the photocatalytic process was 2.46 times as great as that with SA under visible light. The enhanced photocatalytic ability could be attributed to the improved hydrophilicty of α-S.
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 35
·期 2
·394-408
·
IF 2.007
Lv Xiao,Xiao Jun,Sun Tingting,Huo Xiaodong,Song Min,Shen Laihong
Tar is a barrier to limit the development of biomass gasification. Catalytic steam reforming experiments using α -methylnaphthalene (MNP) as a model tar compound were carried out in the two-stage reactor system (TSR). Based on response surface methodology, the effects of TSR temperatures and the molar ratio of steam to carbon (S/C) on MNP reforming performances were analyzed using the Li-modified Ni-based catalyst (NBC). The results show that the proper introduction of H 2 is able to improve significantly the MNP conversion, specially at lower temperatures. Furthermore, it is more appropriate for the modified catalysts by Li and Mg to be loaded in the first reactor due to their significant promotion to hydrocracking reactions, and it is favorable to place the Ni/Al catalyst in the second reactor for H 2 -rich gas. Additionally, the carbon deposition resistance of the NBC modified by Li exhibits better than that of the NBC modified by Mg.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ting Li,Yikun Wang,Lingling Yuan,Qianwen Zhou,Shuangyan Qiao,Zhengqing Liu,Shaokun Chong
Conversion mechanism anode materials have been widely employed for potassium ion batteries (PIBs) due to high theoretical specific capacities. However, large volume expansion and poor electrochemical kinetics have become the key bottlenecks hindering its further development. Herein, α-MnSe nanorods wrapped by N-doped carbon and graphene (α-MnSe@NC@graphene) are constructed as anode materials for PIBs . The architecture can not only provide superior electrode integrity to buffer volume variation and maintain structure stability via synergistic effects of physical encapsulation and Mn-C chemical bonding, but also serve as conductive network to accelerate the electron transfer and K-ion diffusion. As a result, α-MnSe@NC@graphene composite delivers high initial charge specific capacity of 307.9 mAh·g −1 and great cycling stability over 250 cycles with the capacity retention of 232.8 mAh·g −1 at 50 mA·g −1 . Besides, superior rate capability (91.1 mAh·g −1 at 2.0 A·g −1 ) and long lifespan over 700 cycles at 1.0 A·g −1 with the low capacities decay rate of 0.064% per cycle can be acquired. Ex situ TEM and XPS results verify that K-ion insert into/extract from α-MnSe@NC@graphene through a conversion mechanism based on the Mn-ion redox site (MnSe + 2 K + + 2e - ↔ Mn + K 2 Se).
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 27
·期 3
·1605011
·
IF 11.382
Yaxiong Yang,Yongfeng Liu,Kaichao Pu,Xing Chen,He Tian,Mingxia Gao,Min Zhu,Hongge Pan
In this study, an amorphous Li 2 CO 3 -coated nanocrystalline α-Fe 2 O 3 hierarchical structure is synthesized for the first time using a facile one-step mechanochemical process at room temperature, taking advantage of the concurrence of repeated fracture-cold welding of material's particles and a gas-solid redox reaction. The conformal coating and hierarchical structure significantly increase the cycling durability and rate capability. Typically, a 1–3 nm thick amorphous Li 2 CO 3 layer is conformally coated on Fe 2 O 3 nanocrystallines (≈10 nm in size) that form hierarchically aggregated particles 400–800 nm in size by ball milling α-Fe 2 O 3 with LiH in CO 2 . The prepared Li 2 CO 3 -coated nanocrystalline α-Fe 2 O 3 exhibits highly stable long-term cyclability as it delivers a reversible capacity of 975 mAh g −1 with 99% of retention after 400 cycles at 100 mA g −1 . At a high rate of 3000 mA g −1 , its reversible capacity still remains at 537 mAh g −1 , superior to the uncoated counterpart (311 mAh g −1 ). Moreover, amorphous Li 2 O and Li 2 CO 3 coatings are also similarly produced on Fe 2 O 3 and NiO nanocrystallines, respectively, representing the general applicability of this mechanochemical approach.
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2017
·Vol. 60
·期 11
·1121-1128
·
IF 3.956
Yang Hongchao,Wang Changhong,Hu Feng,Zhang Yejun,Lu Huan,Wang Qiangbin
The synthesis of atomic-scale metal catalysts is a promising but very challenging project. In this work, we successfully fabricated a hybrid catalyst of Ptc/Ni(OH) 2 with atomic-scale Pt clusters uniformly decorated on porous Ni(OH) 2 nanowires (NWs) via a facile room-temperature synthesis strategy. The as-obtained Pt c /Ni(OH) 2 catalyst exhibits highly efficient hydrogen evolution reaction (HER) performance under basic conditions. In 0.1 mol L −1 KOH, the Pt c /Ni(OH) 2 has an onset overpotential of ~0 mV vs. RHE, and a significantly low overpotential of 32 mV at a current density of 10 mA cm −2 , lower than that of the commercial 20% Pt/C (58 mV). The mass current density data illustrated that the Pt c /Ni(OH) 2 reached a high current density of 6.34 Amg
−1 Pt
at an overpotential of 50 mV, which was approximately 28 times higher than that of the commercial Pt/C (0.223 A mg
−1 Pt
) at the same overpotential, proving the high-efficiency electrocatalytic activity of the as-obtained Pt c /Ni(OH) 2 for HER under alkaline conditions.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）