Nanoscale
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2024
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IF 5.8
Heyun Lin,Wenzhe Zhang,Huachen Shen,Hailing Yu,Yunlei An,Tiejun Lin,Liangshu Zhong
The catalytic behavior of CO hydrogenation can be modulated by metal–support interactions, while the role of the support remains elusive. Herein, we demonstrate that the presence of strong metal–support interactions (SMSI) depends strongly on the crystal phase of TiO2 (rutile or anatase) and the treatment conditions for the TiO2 support, which could critically control the activity and selectivity of Ru-based nanocatalysts for CO hydrogenation. High CO conversion and olefin selectivity were observed for Ru/rutile-TiO2 (Ru/r-TiO2), while catalysts supported by anatase (a-TiO2) showed almost no activity. Characterization confirmed that the SMSI effect could be neglected for Ru/r-TiO2, while it is dominant on Ru/a-TiO2 after reduction at 300 °C, resulting in the coverage of Ru nanoparticles by TiOx overlayers. Such SMSI could be suppressed by H2 treatment of the a-TiO2 support and the catalytic activity of the as-obtained Ru/a-TiO2(H2) can be greatly elevated from almost inactive to >50% CO conversion with >60% olefin selectivity. Further results indicated that the surface reducibility of the TiO2 support determines the SMSI state and catalytic performance of Ru/TiO2 in the CO hydrogenation reaction. This work offers an effective strategy to design efficient catalysts for the FTO reaction by regulating the crystal phase of the support.
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PubMed
高影响因子
Energy Storage Materials
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2017
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IF 0
Yang Li,Haixia Li,Kangzhe Cao,Ting Jin,Xiaojun Wang,Hongming Sun,Jiaxin Ning,Yijing Wang,Lifang Jiao
Designing the hydrogen evolution reaction (HER) electrocatalysts by tuning the micro/nano structure and optimizing composition to overcome the sluggish HER kinetics have fueled intensive research interests in recent years. Herein, the Co and CoP nanograins embedded in porous nitrogen-doped carbon nanofibers (Co/CoP@NC) are prepared by a controllable electrospinning method and subsequent thermal treatments as the wide-pH HER electrocatalysts. Owning to the prominent merits of strong synergistic relationships between Co and CoP nanoparticles , N-doped carbon configuration, and the interconnected three dimensional (3D) porous carbon network, the Co/CoP@NC nanofibers exhibit robust HER activity with affording an overpotential of 117 mV in acidic and 180 mV in alkaline media to deliver the current density of 10 mA cm -2 . As a practical application, when integrated the Co/CoP@NC/Ni foam cathode with the NiFe layered double hydroxides/Ni foam anode (NiFe-LDH/Ni foam), the electrolyzer can afford the cell voltage of 1.62 V to deliver the current density of 10 mA cm -2 , as well as ultralong lifetime of 60 h in alkaline medium, providing a viable alternative to the noble-metal electrocatalysts for water splitting.
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ACS Applied Materials & Interfaces
·
2017
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IF 7.504
Lifeng Wang,Keming Xu,Xiaochun Hou,Yiyuan Han,Shiying Liu,Christian Wiraja,Cangjie Yang,Jun Yang,Mingfeng Wang,Xiaochen Dong,Wei Huang,Chenjie Xu
The stable presence of fluorophores within the biocompatible and biodegradable elastomer poly(glycerol-co-sebacate) acrylate (PGSA) is critical for monitoring the transplantation, performance, and degradation of the polymers in vivo. However, current methods such as physically entrapping the fluorophores in the polymer matrix or providing a fluorescent coating suffer from rapid leakage of fluorophores. Covalent conjugation of fluorophores with the polymers and the subsequent core-cross-linking are proposed here to address this challenge. Taking rhodamine as the model dye and PGSA nanoparticles (NPs) as the model platform, we successfully showed that the synthesized rhodamine-conjugated PGSA (PGSAR) NPs only released less than 30% rhodamine at day 28, whereas complete release of dye occurred for rhodamine-encapsulated PGSA (PGSA-p-R) NPs at day 7 and 57.49% rhodamine was released out for the un-cross-linked PGSAR NPs at day 28. More excitingly, PGSAR NPs showed a strong quantum yield enhancement (26.24-fold) of the fluorophores, which was due to the hydrophobic environment within PGSAR NPs and the restricted rotation of (6-diethylamino-3H-xanthen-3-ylidene) diethyl group in rhodamine after the conjugation and core-cross-linking. The stable presence of dye in the NPs and enhanced fluorescence allowed a longitudinal tracking of stem cells both in vitro and in vivo for at least 28 days.
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高影响因子
DESALINATION
·
2025
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IF 9.8
Tunga Kuhana Arsene,Zihao Zhai,Junyong Zhu,Miaomiao Tian,Yatao Zhang
Nanofiltration membranes' performance hinges on their ion sieving and water permeability, which are affected by the crosslinking degree, uniformity, thickness, and microstructure of the active layer. Additive control offers a promising approach for optimizing membrane properties. This study presents a novel approach to improve water permeance of nanofiltration membranes by introducing organophosphorus end-capping reagents ((2-aminoethyl) triphenyphosphonium bromide (ATPB), (3-aminopropyl) triphenylphosphonium bromide (ATPPB), and 2-(diphenyphosphino) ethylamine (DPPE)) as co -reactive additives in the aqueous phase during interfacial polymerization. These reagents influenced the amine monomer's diffusion behavior, leading to a more homogeneous and potentially thinner polyamide (PA) layer, as demonstrated by molecular dynamics (MD) simulations. By regulating this process, we effectively modified pore characteristics, charge density distribution, and structural properties of the PA layer, all through a straightforward one-step method. The ATPB-0.015 membrane emerged as the optimal choice due to its excellent performance, characterized by a nodular buried structure, a water permeance of 16.3 L m −2 h −1 bar −1 , and a high Na 2 SO 4 rejection (98.5 %). In addition, the amide and phosphorus units on the ATPB-0.015 membrane surface facilitated the removal of 97.48 % of Escherichia coli through hydrogen bonding and electrostatic interaction, enhancing its anti-bacterial property. Anti-fouling tests employing bovine serum albumin (BSA) and humic acid (HA) as foulants revealed that the ATPB-0.015 membrane demonstrated a faster recovery ratio than the control membrane, primarily attributed to its enhanced surface hydrophilicity. This study demonstrates a facile method for designing nanofiltration membranes with controlled structure and functional performance characteristics.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Xun Li,Hui Hu,Tian Tan,Mengjing Sun,Yuwen Bao,Zhongbing Huang,Sohail Muhammad,Xiaohong Xia,Yun Gao
Detection of leaks of flammable methane (CH4) gas in a timely manner can mitigate health, safety, and environmental risks. Zinc oxide (ZnO), a polar semiconductor with controllable surface defects, is a promising material for gas sensing. In this study, Ag–Ru co-doped into self-assembled ZnO nanorod arrays (ZnO NRs) was prepared by a one-step hydrothermal method. The Ag–Ru co-doped sample shows a good hydrophobic property as a result of its particular microstructure, which results in high humidity resistance. In addition, oxygen vacancy density significantly increased after Ag–Ru co-doping. Density functional theory (DFT) calculations revealed an exceptionally high charge density accumulated at the Ru sites and the formation of a localized strong electric field, which provides additional energy for the CH4 reaction with •O2– at the surface at room temperature. Optimized AgRu0.025–ZnO demonstrated an outstanding CH4 sensing performance, with a limit of detection (LOD) as low as 2.24 ppm under free-heat and free-light conditions. These findings suggest that introducing defects into the ZnO lattice, such as oxygen vacancies and localized ions, offers a promising approach to improving the gas sensing performance.
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高影响因子
Small
·
2025
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IF 12.1
Zhefei Zhao,Wenjie Yan,Wenbin Zheng,Lipeng Guo,Ruopeng Yu,Minhao Chen,Huajun Zheng
Electrocatalytic hydrogenation (ECH) of quinoline provides an eco-friendly and prospective route to achieve the highly value-added generation of 1,2,3,4-tetrahydroquinoline (THQ). Co element has been proven to be the efficient catalytic site for ECH of quinoline, but the rational regulation of the electronic structure of active Co site to improve the activity is still a challenge. Herein, the hierarchical core–shell structure consisting of NiCo-MOF nanosheets encapsulated Cu(OH) 2 nanorods (Cu(OH) 2 @CoNi-MOF) is constructed. The heterojunction promotes the transfer of interfacial charge and optimizes the electronic structure of the Co site. The introduction of Ni significantly increases the binding between Co and Cu, preventing the exfoliation of Co sites from Cu(OH) 2 core, and reducing the reaction energy barrier of rate-determining step, thus resulting in superior reactivity and durability. Besides, electrochemical reconstruction further modulates the electronic structure of Co by forming the multi-metallic compound with a low valence state (NiCoCu), achieving an optimal performance with a conversion of 99.5% and THQ selectivity of 100%. A flow-cell system is assembled, demonstrating the prospect for industrial application.
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PubMed
高影响因子
CELLULOSE
·
2024
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IF 4.9
Yan Yujie,Jin Bo,Peng Rufang
Ammonium perchlorate (AP), as an oxidant and a main component in solid propulsion, has been of wide concern by researchers in recent years. However, problems, such as higher high-temperature decomposition peaks and nonconcentration of exothermic heat release, hinder its application. The addition of combustion catalysts can resolve these problems, but the small size of metals is prone to agglomeration and affects the performance of AP. Graphene oxide, which has a large specific surface area as a carrier, hydroxyethyl cellulose as an intercalating agent, cobalt nitrate as the three-dimensional porous carbon aerogel were prepared as catalyst for AP. The high-temperature decomposition peak of AP was greatly reduced by 116.5 K, which resulted in a great energy release.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Ying Yang,Hua Li,Yilong Hou,Ce Wang,Kangyi Zhang,Zhihao Man,Jiangwei Shang,Xiuwen Cheng
Antibiotics that permeate aquatic environments present significant risks to both ecosystems and human health. In this study, we employed the techniques of room temperature aqueous solution precipitation to fabricate ZIF-67 derivatives, and established a Co 3 O 4 /CeO 2 /O 3 /PMS (Co-Ce/OP) system. Furthermore, a 10 mg/L Levofloxacin (LEF) solution could reach rapid degradation (97.2%) and effective mineralization (40.4%) under specific conditions. Subsequent investigations identified the primary active substances, intermediates, and reaction mechanism in the Co-Ce/OP system. Evidence from Electron Paramagnetic Resonance (EPR) and quenching experiments indicates that SO 4 · - , OH·, O 2 · - and 1 O 2 contribute to the degradation process. Applying High Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS), we discovered that the principal degradation mechanisms for LEF encompass the cleavage and subsequent loss of the piperazine, quinolone, and morpholine rings, in addition to decarboxylation and defluorination reactions. Besides, we studied the acute toxicity, bioconcentration factor, developmental toxicity, and mutagenicity of LEF and its intermediate products. Our findings reveal a notable reduction in the toxicity of the intermediate products relative to LEF. Later experiment demonstrates that the degradation rate of LEF sustains above 90% after five cycles of reactions, indicative that the catalyst has excellent recyclability and stability. Furthermore, this study employed experiments across four different natural water matrices, demonstrating the system's considerable potential for effective application within authentic aquatic settings.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Shuang Liu,Qiaofeng Han,Xiaoheng Liu
Utilizing solar energy to produce hydrogen peroxide from oxygen and water offers an appealing and sustainable approach. In this work, Co-doped ZnIn 2 S 4 nanosheets were effectively synthesized through a chemical precipitation method, and the morphological structure, band structure and pathways for hydrogen peroxide production were investigated. The results indicate that Co doping significantly enhances the photocatalytic efficiency of ZnIn 2 S 4 in producing hydrogen peroxide. The sample with the 2 % doping concentration exhibited the highest rate, with a detected hydrogen peroxide concentration of 535.53 µM in the solution after 100 minutes of exposure to visible light, which is 4.29-fold higher than that of undoped ZnIn 2 S 4 . Further analysis revealed that the improved performance mainly originated from better spectral response, faster photogenerated carrier transport, and lower recombination frequency of photogenerated electron-hole pairs.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yingna Chang,Yuxiang Zuo,Jiawei Li,Jindi Wang,Kefan Song,Yu Liu,Rong Xing,Guoxin Zhang
Supportive atomic Zn electrocatalysts exhibit excellent stability for oxygen reduction reaction (ORR) due to their fully occupied d orbitals of Zn, but their catalytic activity is not satisfactory. Whereas heteroatom doping can anchor the Zn atoms to achieve higher Zn loading; and additionally serve as auxiliary sites to enhance the catalytic activity of Zn sites. Herein, we present a method for the synthesis of N, S co-doped carbon with highly dispersed Zn (named Zn-NSC). The ORR activity of the Zn-NSC catalysts is optimized by adjusting the pyrolysis temperature and the atomic structure of the dopant molecules. The optimized Zn-NSC demonstrates significantly enhanced ORR electrocatalytic activity, this is attributable to its highly co-doping of N and S heteroatoms that are adjacent to Zn atoms. Specifically, the Zn-NSC 3 catalyst exhibits remarkable ORR characteristics with excellent onset voltage (0.97 V vs RHE) and half-wave potential (0.87 V vs RHE), surpassing those of Pt/C (0.97 V and 0.85 V, respectively). Additionally, the Zn-NSC 3 can be utilized as efficient cathode for Al-air batteries, achieving a high power density of 119.4 mW cm −2 and satisfactory discharge stability. This work proposes an approach for synthesizing low-cost and efficient ORR electrocatalysts for Al-air battery applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tao Wang,Junling Yu,Jianmin Liu,Feng Jiang,Guo Feng,Jian Liang,Lifeng Miao,Quan Zhang,Qian Wu,Xinbin Lao
A fluorine-free route has been developed to fabricate V/Pr co-doped zircon (ZrSiO 4 ) ceramic pigments with Na 3 VO 4 and Pr(NO 3 ) 3 ·6H 2 O as colourants . The as-prepared pigments were characterized by XRD , Raman, XPS , UV–vis, FE-SEM, TEM and automatic colourimeters . The results show that Na 3 VO 4 can not only act as colourant to produce blue hue, but as mineralizer to accelerate the formation of V/Pr co-doped ZrSiO 4 pigment. A colour tuning between blue, green and yellow can be achieved by increasing the mole ratio of Pr/V, and the most intense yellow hue (L* = 74.55, a* = −0.38, b* = 46.82) is obtained at a mole ratio of Pr/V = 0.5. Both Pr 4+ and Pr 3+ cations are co-existed in the pigments, where Pr 4+ contributes to the generation of yellow hue while Pr 3+ undermines the yellow hue. The good chromatic ability in glaze at high temperature suggest its potential application in ceramic decoration.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
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IF 2.8
Chenwei Liu,Ran Jing,Yue Li,Daolai Sun,Jianhua Lv
Background Succinic acid is a vital platform chemical derivable from lignocellulosic biomass. Various non-noble metal catalysts were used to hydrogenate succinic acid and produce 1,4-butanediol in this study. Among them, Co-loaded SiO 2 with a moderate mean pore size of 10 nm exhibited a superior catalytic performance. Results The high catalytic activity of Co-loaded SiO 2 , which was prepared by an impregnation method, was demonstrated in the hydrogenolysis of succinic acid to provide 1,4-butanediol. The Co/SiO 2 catalyst reduced at 400 °C and calcined at 300 °C existed in the form of Co 2+ and Co 0 , exhibiting a high catalytic activity. The production of 1,4-butanediol from succinic acid was significantly enhanced at a temperature of 200 °C and an H 2 pressure exceeding 5 MPa. At 200 °C and 7 MPa H 2 pressure, a 1,4-butanediol selectivity of 67.8% and a full succinic acid conversion were obtained over Co/SiO 2 . Conclusion The Co-loaded SiO 2 with a moderate mean pore size of 10 nm was conducive to the efficient generation of 1,4-butanediol from succinic acid. The Co/SiO 2 catalyst reduced at 400 °C existed in the form of Co 0 and Co 2+ . It was suggested that the efficient synthesis of 1,4-butanediol from succinic acid was facilitated by the cooperative action of Co 0 and Co 2+ . © 2024 Society of Chemical Industry (SCI).
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