JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Haizhen Liu,Liwen Lu,Hui Luo,Jiayi Deng,Guangxu Li,Hua Ning,Yi Fan,Cunke Huang,Zhiqiang Lan,Wenzheng Zhou,Jin Guo,Xinhua Wang
The Li-Mg-B-H composite (2LiBH 4 + MgH 2 ) is acknowledged as a promising material for hydrogen storage due to its large hydrogen capacity (11.4 wt.%). However, the sluggish kinetics and poor reversibility make it difficult to be practically used. In this work, the hydrogen storage performances of 2LiBH 4 + MgH 2 have been significantly improved by a hybrid of bulk NbC and layered Nb 4 C 3 MXene (denoted as “Nb-C”). The 2LiBH 4 + MgH 2 + 6 wt.% Nb-C can release 8.5 wt.% H 2 within 30 min at 400°C and the dehydrogenated composite can absorb 9.3 wt.% H 2 within 30 min at 350°C and 7.5 MPa H 2 . The reversible dehydrogenation capacity maintains at 8.4 wt.% after 24 cycles, with a capacity retention ratio of 95.4%. By contrast, the undoped 2LiBH 4 + MgH 2 suffers from serious capacity degradation, with the capacity decreased dramatically to 3.5 wt.% after 3 cycles. Microstructural studies revealed that the doped composite has uniform particle and elemental distributions and possesses various multiphase interfaces of LiH/MgB 2 /NbC/Nb 4 C 3 , which is beneficial to hydrogen diffusion during the hydrogen uptake and release process. Theoretical studies by first principle calculation presented an extended bond length of the Mg-H and B-H bonds in the 2LiBH 4 + MgH 2 + NbC system, which may also explain the improved hydrogen storage properties of 2LiBH 4 + MgH 2 by addition of Nb-C. This work provides new insights into the role of transition metal carbides in regulating the Li-Mg-B-H hydrogen storage materials both experimentally and theoretically.
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高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Xinyi Jing,Linggong Meng,Tong Liu,Xinming Ye,Shuai Yang,Zhichao He,Wensheng Wang,Jie Li,Yingchun Li
Achieving high thermal conductivity in composites with low filler content is a major challenge in current research. In this paper, polypropylene (PP) and polyamide 6 (PA6) were used as polymer matrix, and the hybrid thermal conductive filler, formed by hexagonal boron nitride (h-BN) and aminated carbon nanotubes (NH 2 -CNTs), was integrated into matrix for the fabrication of thermal conductive composites (PP/PA6/h-BN and PP/PA6/h-BN@CNTs) via two-step melt blending technology. The thermal conductive fillers were selectively distributed in a phase of the polymer matrix with a co-continuous structure, forming a thermal conductive path with a three-dimensional network structure. The results show that when the content of h-BN reaches 25 wt%, the thermal conductivity of the PP/PA6/h-BN and PP/PA6/h-BN@CNTs composites was 199% and 300% higher than that of PP/PA6, respectively. Through testing the volume resistivity of the composites, it was confirmed that PP/PA6/h-BN@CNTs composites maintain good electrical insulation. Both composites demonstrated remarkable thermal conductivity and outstanding electrical insulation. This research provides a facile way to prepare highly thermal conductivity polymer composites with excellent processing performances and electrical insulation. Highlights h-BN@CNTs hybrid fillers with sandwich structure were prepared. A two-step blending method was used to control the selective distribution of hybrid fillers in a phase of the polymer matrix with a co-continuous structure. The hybrid filler formed a thermal conductive path with a three-dimensional network structure in the collective. PP/PA6/h-BN@CNTs composites demonstrated remarkable thermal conductivity, outstanding electrical insulation and favorable processing performances.
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CEMENT & CONCRETE COMPOSITES
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2022
·
IF 9.93
Xing Ming,Qing Liu,Miaomiao Wang,Yongqing Cai,Binmeng Chen,Zongjin Li
Chloride-induced corrosion in reinforced concrete is a primary durability issue that causes large economic loss every year. To improve the intrinsic chloride binding capacity and realize a favorable corrosion protection of cement-based materials are thus crucial to prolong the service life of concrete structures. Here, alumina nano particles (ANPs) were incorporated to improve the chloride binding capacity of cement pastes in chloride solutions and the anti-corrosion performance of mortars under accelerated corrosion process. The ANPs facilitated the formation of alumino-ferrite-mono (AFm)-type phases, thereby improved the content of chemically bound chlorides. Solution calcium (Ca) ions benefited the chloride captured by calcium-(alumino-)silicate-hydrates (C-(A-)S-H) in the assistance of ANPs, especially at high initial chloride concentrations , and further evoked a pH-related chloride binding response. Moreover, the enhanced corrosion resistance was finally realized by incorporating appropriate amount of ANPs because of the filling and chemical effects induced low permeability of mortars. In general, the ANPs possess dual functions in the aspects of chloride binding and corrosion inhibition . These findings are expected to advance the design of high-durable cement-based materials serviced in the marine environment.
研究领域:
建筑材料
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土木工程材料
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腐蚀科学
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纳米材料应用
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混凝土耐久性
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xu Huang,Xuezhang Xiao,Xuancheng Wang,Zhendong Yao,Jiahuan He,Xiulin Fan,Lixin Chen
Li–Mg–B–H reactive hydride composite (RHC) has attracted extensive attention over the past decades for its extremely high hydrogen storage capacity (11.5 wt%). But the sluggish desorption kinetics for the second step dehydrogenation reaction need to be further improved. Herein, short rod-like TMTiO 3 (TM = Co, Ni) bimetallic oxides , which contain two kinds of transition metal elements, were synthesized and introduced into Li–Mg–B–H RHC for the first time. The NiTiO 3 exhibits excellent catalytic effect on the hydrogen desorption kinetic performance of Li–Mg–B–H RHC, and the incubation period for the second step dehydrogenation reaction is eliminated completely by reducing the apparent activation energy for the generation of MgB 2 from 296 kJ/mol to 269 kJ/mol. The NiTiO 3 doped Li–Mg–B–H RHC can desorb about 9.0 wt% H 2 without obvious attenuation of kinetic performance in five cycles. Mechanism analyses reveal that the in-situ generated nano-sized MgNi 3 B 2 and TiB 2 species (∼5 nm) both meet the critical value ( < 10%) of the edge-to-edge matching model (5.77% for MgNi 3 B 2 and 2.22% for TiB 2 ), which play a significant role in supporting the nucleation of MgB 2 . Meanwhile, the extremely fine MgNi 3 B 2 and TiB 2 heterogeneous nucleation sites can inhibit the excessive growth for a single crystal nucleus of MgB 2 . The heterogeneous nucleation and grain refinement mechanisms caused by the novel bimetallic oxide could provide alternative insights into designing an in-situ generated nano-sized catalytic hydrogen storage system with enhanced kinetics and cyclic stability for hydrogen-fueled applications.
研究领域:
材料科学
·
能源科学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Rajapriya Andavar,Mameng Yang,Cunpeng Duan,Anuj Kumar,Yanzhi Sun,Junqing Pan
Industrial-level alkaline water electrolysis requires high-efficiency catalysts to achieve rapid water dissociation and hydrogen intermediate migration at an ampere-level current density. However, conventional alloy catalysts lack spatially organized, abundant site functions, resulting in poor coupling between alkaline electrolysis steps. Here, we report a new NiCoFeCuMoW high-entropy alloy (HEA) catalyst prepared by pulse electrodeposition, featuring efficient mass and charge transport. The catalyst features a three-dimensional hierarchically porous framework with tailored surface atomic configurations and chemically differentiated multimetallic motifs, enabling abundant accessible active sites, accelerated transport, and cooperative regulation of reaction intermediates. Density functional theory (DFT) calculations show that Mo/W-richdomains preferentially facilitate H 2 O dissociation, whereas adjacent NiCoFeCuMoW ensembles optimize hydrogen diffusion and intermediate stabilization via regulated d-band states, thereby establishing an efficient dissociation-diffusion cascade. The NiCoFeCuMoW HEA delivers overpotentials of only 36 mV within the hydrogen evolution reaction (HER) while exhibiting 226 mV in the oxygen evolution reaction (OER) operating in alkaline electrolytes at 10 mA cm −2 . Amazingly, the cell delivers an ultra-low electrolyte potential of 1.57 V at 120 °C and 1 A cm −2 , owing to greatly enhanced charge-mass transport and perturbed hydrogen-bond networks in the over-boiling environment, providing a scalable HEA design strategy for ampere-level industrial water splitting. The boosted electrocatalytic acitivity of new HEAs alloy catalyst under over-boiling environment. Download: Download high-res image (204KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shucheng Liu,Ying Sun,Danzhao Guo,Ruiheng Lu,Yuying Mao,Hongxiang Ou
For porous molecular imprinted polymers (MIPs), introduction of special functional groups and integration porous structure support will endow the MIPs with tunable surface properties and specific affinity performance. Herein, by combination of RAFT molecular imprinting, Pickering emulsion, and boronate affinity methods, a new kind of porous imprinted microspheres (BA-HPMIPs) using the low pKa value of APBA (1-allylpyridinium-3-boronic acid, pKa = 7.4) as functional monomer was prepared for specific molecular recognition and separation of NRG. Meanwhile, the novel RAFT functioned surfactants with dual amide multiple H-bonds were designed as stabilized particles was used to promote sustainability, which further confer them multifunctionality and/or by polymerizing the Pickering emulsion itself. Equilibrium adsorption was reached rapidly within 360 min, and the maximum equilibrium binding capacities of BA-HPMIPs were found to be 118.32 µmol g −1 for NRG. Furthermore, they had a stronger selectivity towards NRG than other competitive target (i.e rutin, catechol, ARS, o -nitrophenol). Moreover, BA-HPMIPs have shown outstanding reusability of 8.63 % loss in enrichment performance after five times repeatedly. As a proof of this concept, a commercially avaliable NRG with purity could be effectively extracted and concentrated to 96.75 % purity. These results demonstrated that, a new kind of porous imprinted microsphere with abundant porous structure and boronic acid recognizing sites has great potential for separation and purification of industrial samples under neutral conditions.
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JOURNAL OF BIOSCIENCE AND BIOENGINEERING
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2019
·
IF 2.032
Xiaohong Lu,Juhua Chen,Linshu Jiao,Lei Zhong,Zhaoxin Lu,Chong Zhang,Fengxia Lu
Directed evolution methodologies have been used as promising strategies for improving the catalytic properties of many existing enzymes . In the presented work, this approach was applied to improve the enzyme activity of l -asparaginase I obtained from Bacillus megaterium H-1. After two rounds of error-prone polymerase chain reaction (epPCR) and two generations of sequential DNA shuffling , all of 5 different mutants showed a significant increase in the enzyme activity of l -asparaginase I, ranging from 6.27 to 22.78 IU/mL. Among these mutants, D-9B and DD-12G displayed the relatively high catalytic activity , which were 20.22-fold and 21.33-fold higher than the wild-type enzyme (WT), respectively. Furthermore, the catalytic efficiency ( k cat / K m ) of D-9B and DD-12G were also improved, which were 132.73 min −1 mM −1 and 146.39 min −1 mM −1 , respectively, in comparison to that of WT (3.39 min −1 mM −1 ). In addition, mutant DD-12G showed tolerance toward wider range of pH values and higher temperatures than its WT counterpart. Homology modeling of above two mutants reflected a reduction of hydrogen bonds and an introduction of flexible residues in the loops near the active catalytic site Thr15. These changes contributed to the flexibility of loops, which may lead to further enhancement in catalytic efficiency. Results also showed that approximately 88.5% (0.978 mg/kg) acrylamide could be removed from mutant DD-12G pre-treated fried potato chips. This study clearly shows that directional evolution methods can indeed be utilized to improve the activity of l -asparaginase, which could also provide research basis for future application in food industry.
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DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 24
·9216-9225
·
IF 4.097
Qiong Wu,Tianfeng Chen,Zhao Zhang,Siyan Liao,Xiaohui Wu,Jian Wu,Wenjie Mei,Yanhua Chen,Weili Wu,Lingli Zeng,Wenjie Zheng
Two arene Ru(II) complexes coordinated by 2-(3-methoxyphenyl)imidazole[4,5-f][1,10]phenanthroline, [(η6-RC6H5)Ru(m-MOPIP)Cl]Cl (R = H, 1; R = CH3, 2), have been prepared under microwave irradiation; the crystal structure of 2 exhibits a typical “piano stool” conformation, with bond angles for N1–Ru1–Cl1 86.02 (14)° and N2–Ru1–Cl1 84.51 (14)°. The Ru–C distance for the Ru atom bound to the benzene ring is about 0.2178(8) nm, and the average Ru–N distance for Ru atom to the two chelating N atoms is about 0.2092(4) nm. The evaluation of in vitro anticancer activities revealed that these synthetic Ru(II) complexes selectively inhibited the growth of HepG2 hepatocellular carcinoma cells, with low cytotoxicity toward LO2 human normal liver cells. The results demonstrated that the complexes exhibited great selectivity between human cancer and normal cells by comparing with the ligand m-MOPIP. Furthermore, complexes 1 and 2 could bind to c-myc G4 DNA in groove binding mode in promising affinity, and the insertion of the methyl groups in the arene ligand contributed to strengthen the binding affinity. This was also confirmed by molecular docking calculation and 1H NMR analysis which showed that both 1 and 2 can bind in the loop constructed by A6–G9 and G21–A25 base pairs in c-myc G4 DNA to block the replication of c-myc oligomer. Taken together, these results suggest that arene Ru(II) complexes display application potential as small molecule inhibitors of c-myc G4 DNA.
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Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 10
·1292-1300
·
IF 8.683
Yueyue He,Zhuo Chen,Xiaogang Chen,Xian-Ming Zhang,Dongying Fu
Organic–inorganic hybrid perovskite (OIHP) multifunctional molecular switching materials have been widely studied as excellent supplements to the conventional all-inorganic perovskites due to their structural diversity and property adjustability. However, considering their practical application, the phase transition temperature (Tp) of the system is a crucial evaluation standard and meanwhile it remains an arduous challenge to construct phase transition materials with three kinds of switching characteristics. Therefore, the design of high Tp multifunctional switching materials is a huge task. Herein, we have reported a chiral OIHP multifunctional semiconductor 2 ([(R)-N-fluoroethyl-3-quinuclidinol]PbBr3) with dielectric switching, nonlinear switching and ferroelastic switching characteristics and an ultrahigh Tp of 498 K, which is obtained from compound 1 ([(R)-N-ethyl-3-quinuclidinol]PbBr3) with a Tp of 445 K through the strategy of H/F substitution. The substitution of F atoms for H atoms not only changes the coordination environment of Pb, but also increases the molecular interactions due to the stronger electronegativity of the F atoms, which raises the barrier of rotation of the fluorinated organic cations, (R)-N-fluoroethyl-3-quinuclidinol, and finally leads to a remarkable increase in Tp. Ultimately, through accurate molecular design, the Tp of compound 2 has been increased by 53 K and compound 2 exhibits three kinds of switching characteristics, which also makes it a superior switching material for practical application.
研究领域:
材料科学
·
化学
·
物理学
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Materials Today Communications
·
2022
·
IF 3.662
Chenchen Xiong,Yang Zhou,Yanji Jin,Chao Liu,Pan Feng
Calcium silicate hydrates (C-S-H) are the strength sources of cement-based materials. However, the arbitrary packing of C-S-H particles at the nanoscale limit the mechanical properties considerably. In this study, we achieved high-order growth and improved mechanical properties of C-S-H by polymer addition and fine-tuning of the pH value. We found that a proper initial condition contributes to a uniform dispersion of colloidal C-S-H particles, which is essential for subsequent ordered growth. On the basis of stable dispersion, an accurate control of increasing pH values can induce the high-order and dense growth of C-S-H, which obtains a significantly higher elastic modulus as twice as traditional C-S-H. Furthermore, the polymer steric hindrance effect in low pH condition and templating effect of long chain in the higher pH condition explained the well-arranged growth of C-S-H with the interaction to polymer. We hope this highly ordered C-S-H may pave the way for designing tougher and more durable cement-based materials.
研究领域:
材料科学
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土木工程
·
化学工程
·
纳米技术
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高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Zu-Sheng Huang,Xu-Feng Zang,Tao Hua,Lingyun Wang,Herbert Meier,Derong Cao
Five novel metal-free organic dyes DQ1–5 containing a dipentyldithieno[3,2-f:2′,3′-h]quinoxaline (DPQ) unit were synthesized and applied in dye-sensitized solar cells (DSSCs), where DPQ was employed as a π-spacer for the first time. Their photophysical, electrochemical, and theoretical calculations and photovoltaic properties were systematically investigated. All the five dyes show broad photoresponse. Especially the absorption edges of DQ3–5 extend to 800 nm on the TiO2 films. The inserted electron-rich unit 3,4-ethylenedioxythiophene or electron-withdrawing group benzothiadiazole (BTD) in DPQ-based dyes can greatly influence the optoelectronic properties of the dyes. In addition, the different electron donors also significantly affect the performance of the DSSCs. Under standard global AM 1.5 solar light conditions, the DQ5 sensitized solar cell obtained a power conversion efficiency of 7.12%. The result indicates that the rigid DPQ-based organic dye is a promising candidate for efficient DSSCs.
研究领域:
材料科学
·
能源科学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Siqi Liu,Shanshan Cheng,Zhimeng Liu,Miaomiao Zheng,Hongyuan Wang,Supakorn Boonyuen,Hongyi Gao,Ge Wang
Reactive oxygen species (ROS)-mediated sterilization typically relies on continuous light irradiation or exogenous H 2 O 2 addition, limiting their practical utility under dark or resource-limited conditions. Herein, we rationally design an S-scheme MIL-100(Fe)/Zn 3 In 2 S 6 heterojunction (M 5 Z 1 –1@ZIS2) by in-situ growing Zn-doped MIL-100(Fe) on Zn 3 In 2 S 6 , achieving synergistic light-harvesting and ROS self-supply capabilities. The incorporation of Zn 3 In 2 S 6 enhances electron density around Fe 2+ sites while modulating Fe 3+ states, significantly improving O₂ activation and H 2 O 2 affinity. This unique electronic regulation enables the heterojunction to generate superoxide radical(·O₂ − )-dominated ROS even in the dark. Notably, visible-light pretreatment induces active In sites in Zn 3 In 2 S 6 to produce H 2 O 2 , which accumulates and sustains the FeII/FeIII redox cycle in the absence of light, driving continuous hydroxyl radical(·OH)-dominated ROS generation. Combined characterizations including X-ray photoelectron spectroscopy (XPS) and Electron Paramagnetic Resonance (EPR) confirm H₂O₂-mediated Fe 2+ regeneration and ROS persistence. The M 5 Z 1 –1@ZIS2 heterojunction exhibits exceptional antibacterial performance, achieving ≥99.9% inactivation of Escherichia coli ( E. coli ) within 1.5 h in the dark and 40 min under visible light. This work provides a strategy for designing self-sustaining catalytic systems that leverage light-driven H₂O₂ supply to enable day-night ROS functionality. Furthermore, M 5 Z 1 –1@ZIS2 loaded on polyvinylidene fluoride (PVDF) film can achieve an efficiency of over 99% for particulate matter (PM) pollutants at the wind speeds of 1.5 m/s and 0.5 m/s and reach a maximum adsorption efficiency of 99.5% for formaldehyde within 19 min, highlighting its potential for all-weather air purification via ROS-mediated environmental remediation.
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高影响因子
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