ChemPlusChem
·
2025
·
IF 2.8
Chunqiu Zhao,Qiang Chang,Fu Yin,Guowei Niu,Chenghua Zhang,Dan Liu,Bhekie B. Mamba,Alex T. Kuvarega
Graphical To enhance the catalytic performance of Zn−NC in the hydrogenation of CO to dimethyl ether, highly dispersed bimetallic catalysts are synthesized through the pyrolysis different metal-doped ZIF. The incorporation of secondary metals (Mn, Fe, Co, Ni, Cu) leads to distinct variations in catalytic performance. Among them, the introduction of Cu significantly improves catalytic activity. Highly dispersed bimetallic atomic-scale catalysts have garnered significant attention in syngas conversion filed due to the synergistic effects of the precisely structured bimetallic site, which facilitate the effective activation of CO. Despite their potential, synthesizing these catalysts to meet the specific application requirements remains challenging. Herein, various bimetallic catalysts were synthesized through the pyrolysis of the bimetallic ZIF precursors which were prepared by in situ doping of different metals (Mn, Fe, Co, Ni and Cu) into the ZIF-8 structure. In the presence of a highly dispersed and highly loaded Zn, the doping content in the ultimate second metallic catalysts varied between 0.15–1.20 wt % for different metals. The catalysts were systematically characterized using XRD, BET, TEM, XPS, Raman, ICP, and H 2 -TPD techniques. Among them, the Zn−NC regulated with Cu or Ni exhibited superior catalytic performance. Notably, the Cu−Zn−NC catalyst showed the highest activity, achieving a CO conversion of 32.8 % and optimal DME selectivity approaching 95.2 % in CO hydrogenation reactions. These enhanced performance metrics were attributed to the synergetic effects of bimetallic components. The incorporation of Cu not only preserved the original Zn−N structure but also preserved the catalytic performance unchanged. This preparation strategy is expected to filter out new research targets to use in diverse catalytic applications.
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PubMed
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Hailin Zheng,Mingjie Liang,Weiwei Cai,Kang Li,Min Zheng
Chemical loop combustion (CLC) is an innovative combustion technology that inherently separates the greenhouse gas CO2 while producing no NOx emissions. In this study, a CuMn2O4 composite oxygen carrier was synthesized using the sol–gel method, and the chemical looping combustion performance of the carrier was examined in a fixed-bed reactor utilizing CO as the reducing medium, along with an assessment of its cyclic reaction stability. The rapid increase in oxygen release from CuMn2O4 between 700 and 900 °C indicates a high reaction rate within this temperature range. Furthermore, the oxygen carrier demonstrates the capacity to release a substantial amount of oxygen consistently, with the release reaching its peak at 900 °C. The oxygen release from CuMn2O4 increases significantly within the temperature range of 700–900 °C. Ten reactions involving CuMn2O4 were conducted at 900 °C in an atmosphere containing 8% CO and 3% O2. The results demonstrated an average CO2 selectivity of 96.44%, a CO conversion rate of 95.98%, and a CO2 yield of 93.70%, effectively achieving near-complete capture of CO2. The results show that CuMn2O4 can significantly improve the CO conversion activity and basically regenerate the oxygen carriers of air oxidation reduction. This study fully proves that it is feasible to achieve CO2 capture by CuMn2O4 for converter gas CO, which is the main byproduct produced by converter smelting.
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高影响因子
MOLECULES
·
2025
·Vol. 31
·期 1
·
IF 4.6
Mingyu Liu,Bowen Pei,Hongyu Ba,Wei Ni,Huaheng Zhao,Shuang Chen,Jiamin Zhao,Jinsheng Zhao
The oxygen evolution reaction (OER) in water splitting involves complex multi-electron–proton transfer processes and represents the rate-determining step limiting overall electrolysis efficiency. Developing non-noble-metal catalysts with high activity and stability is therefore essential. Herein, a heterogeneous synthesis strategy was employed to in situ construct an iron-rich layered sulfate precursor (Fe0.42Co0.58-SO4/NF) on nickel foam, which underwent deep self-reconstruction in alkaline electrolyte to form nanoflower-like Fe0.42Co0.58OOH/NF. The optimized catalyst maintained its iron-rich composition and hierarchical structure, delivering outstanding OER performance with an overpotential of 220 mV at 10 mA·cm−2, a Tafel slope of 31.9 mV·dec−1, and stability exceeding 12 h at 600 mA·cm−2. Synchrotron analyses revealed dynamic transitions between mono-μ-O and di-μ-O Fe–M (M = Fe, Co) oxygen bridges during reconstruction, which enhanced both structural robustness and active-site density. The Fe-rich environment promoted the formation of Fe3+–O–Fe3+units that synergized with Co4+species to activate the lattice oxygen mechanism (LOM), thereby accelerating OER kinetics. This work elucidates the key role of oxygen-bridge geometry in optimizing catalytic activity and durability, providing valuable insights into the rational design of Fe–Co-based non-noble-metal catalysts with high iron content for efficient water oxidation.
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高影响因子
Nature Communications
·
2025
·
IF 15.7
Xue Liwei,Wei Fengyuan,Wang Jieyu,Huang Xuelin,Wang Huijuan,Wang Guangzhe,Xiao Li,Wang Gongwei,Zhuang Lin
The identity of cations plays a critical role in electrochemical CO 2 and CO reduction reactions. While most research has focused on elucidating the effects of alkali metal cations, the influence of organic cations, which are widely employed in practical anion exchange membrane (AEM) electrolyzers, remains underexplored. Here, we systematically investigate the effects of a series of organic cations with varying sizes and hydrophilic/hydrophobic properties on the CO reduction reaction (CORR). By combining electrochemical online mass spectrometry for kinetic analysis, in-situ Raman spectroscopy for interfacial species characterization, and ab initio molecular dynamics (AIMD) simulations to probe interfacial structures, we uncover that the structure of organic cations significantly influences the accessibility of interfacial water to the electrode surface, and thus the potential-dependent behavior of surface *H coverage, ultimately modulating the CORR selectivity. These findings provide new insights into the mechanisms governing CORR and can guide the development of efficient AEM electrolyzers for CO conversion.
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高影响因子
Nanoscale
·
2016
·Vol. 9
·期 4
·1547-1558
·
IF 7.76
Qingqing Yang,Lei Wu,Lian Li,Zhou Zhou,Yuan Huang
Co-delivery of multiple agents via nanocarriers is of great interest in cancer therapy, but subcellular delivery to the corresponding site of action remains challenging. Here we report a smart nanovehicle which enables two different site-oriented payloads to reach their targeted organelles based on stimulus-responsive release and nucleus-targeted modification. First, all trans retinoic acid (RA) conjugated camptothecin (RA–CPT) was loaded in a polyhedral oligomericsilsesquioxane (POSS)-based core; docetaxel (DTX) was grafted on N-(2-hydroxypropyl) methacrylamide (HPMA) copolymers. The POSS core grafted with semitelechelic HPMA copolymers then self-assembled into micelles. Once internalized into the cell, the two drugs were unleashed environment-responsively, and nuclear targeted RA remarkably facilitated the nuclear transport of CPT. Compared with single drug-loaded micelles, the dual drug-loaded platform showed superior synergic cytotoxicity, which was further strengthened by the involvement of RA. The ability to induce DNA damage and apoptosis was also enhanced by nucleus-targeted modification. Finally, dual drug-loaded micelles exhibited much better in vivo tumor inhibition (87.1%) and less systemic toxicity than the combination of single drug-loaded systems or the dual drug-loaded micelles without RA. Therefore, our study provides a novel “one platform, two targets” strategy in combinatory anti-cancer therapy.
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PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Xuemeng Yang,Jiadong Wang,Subing Fan,Qingxiang Ma,Xinhua Gao,Jianli Zhang,Tian-Sheng Zhao
The derivatives of primary Fischer-Tropsch synthesis (FTS) products are indispensable to the sustainable FTS run. For the one-pot conversion of FTS-based 1-octene to nonanol, nitrogen-doped cobalt oxides were obtained through hydrothermal synthesis followed by ammonia atmosphere thermal treatment (AATT) at 325 °C with varying treatment time. The AATT significantly affected the phase structure and the surface element valence states of the synthetic samples. The resulting (Co 3 O 4 ) x N showed high catalytic activity toward the reaction of 1-octene with CO + H 2 to nonanol through a successive hydroformylation-hydrogenation process, with conversion of 98 % and selectivity of close to 80 %. The crucial role of the CoO phase and the enhanced adsorption of the reactant molecules by the induced oxygen vacancy (O v ) were discussed based on multiple physicochemical properties characterization and activity evaluation.
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高影响因子
Nanoscale
·
2013
·Vol. 5
·期 7
·2745-2755
·
IF 6.233
Jinyou Lin,Feng Tian,Yanwei Shang,Fujun Wang,Bin Ding,Jianyong Yu,Zhi Guo
The pollution arising from oil spills is a matter of great concern due to its damaging impacts on the ecological environment, which has created a tremendous need to find more efficient materials for oil spill cleanup. In this work, we reported a sorbent for oil soak-up from a water surface with a high sorption capacity, good selectivity, and excellent reusability based on the hydrophobic–oleophilic fibrous mats that were fabricated via co-axial electrospinning polystyrene (PS) solution as the shell solution and polyurethane (PU) solution as the core solution. The fine structures of as-prepared fibers were regulated by manipulating the spinning voltages, core solution concentrations, and solvent compositions in shell solutions, which were also characterized by field emission scanning electron microscopy, transmission electron microscopy, nitrogen adsorption method, and synchrotron radiation small-angle X-ray scattering. The effects of inter-fiber voids and intra-fiber porosity on oil sorption capacities were well studied. A comparison of oil sorption capacity for the single fiber with different porous structures was also investigated with the help of scanning transmission X-ray microscopy. The results showed that the sorption capacities of the as-prepared sorbent with regards to motor oil and sunflower seed oil can be 64.40 and 47.48 g g−1, respectively, approximately 2–3 times that of conventional polypropylene (PP) fibers for these two same oils. Even after five sorption cycles, a comparable oil sorption capacity with PP fibers was still maintained, exhibiting an excellent reusability. We believe that the composite PS–PU fibrous mats have a great potential application in wastewater treatment, oil accident remediation and environmental protection.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4183
·
IF 5.719
Yu Zhang,Xiang Li,Dahai Hu,Qier Sa,Xinran Wang,Fengxiang Wang,Kaixuan Wang,Xuelian Zhou,Zhiqiang Song,Yongfu Liu,Kefu Chao
LEDs for plant lighting have attracted wide attention and phosphors with good stability and deep-red emission are urgently needed. Novel Cr3+and Dy3+co-doped Gd3Al4GaO12garnet (GAGG) phosphors were successfully prepared through a conventional solid-state reaction. Using blue LEDs, a broadband deep-red emission at 650–850 nm was obtained due to the Cr3+ 4T2→4A2transition. When the Cr3+concentration was fixed to 0.1 mol, the crystal structure did not change with an increase in the Dy3+doping concentration. The luminous intensity of the optimized GAGG:0.1Cr3+, 0.01Dy3+was 1.4 times that of the single-doped GAGG:0.1Cr3+. Due to the energy transfer from Dy3+to Cr3+, the internal quantum efficiency reached 86.7%. The energy transfer from Dy3+to Cr3+can be demonstrated through luminescence spectra and fluorescence decay. The excellent properties of the synthesized phosphor indicate promising applications in the agricultural industry.
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高影响因子
Heliyon
·
2024
·
IF 3.4
Yanru Yin,Mengmeng Jiang,Lianhua Tian
A series of GdY 2 SbO 7 :Bi 3+ , Eu 3+ phosphors were prepared using the conventional solid-state reaction. In this study, the photoluminescence properties and temperature sensitivity of the samples were investigated. When Bi 3+ and Eu 3+ were codoped into GdY 2 SbO 7 , the intensity of Bi 3+ decreased with increasing Eu 3+ concentration, indicating a potential energy transfer from Bi 3+ to Eu 3+ . To examine the temperature sensitivity of the sample, its emission spectrum was investigated in the range of 300–500 K. Based on different temperature dependences of Bi 3+ and Eu 3+ , the relative sensitivity ( S r ) and absolute sensitivity ( S a ) of the samples were calculated using the fluorescence intensity ratio (FIR) and thermochromic methods. In FIR modes, S r based on I Eu 3+ /I Bi 3+ reached 1.26 % K −1 at 500 K, while S r on double excitation method reached 1.36 % K −1 at 340 K. In addition, according to the thermochromic properties of GdY 2 SbO 7 :Bi 3+ , Eu 3+ phosphor, the temperature-sensing ability of the sample was investigated, and S r reached a maximum value of 0.5996 % K −1 at 300 K.
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高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2021
·
IF 3.531
Juping Ma,Yan Jiao,Chongyun Shao,Yan Sun,Fei Yu,Lili Hu
In this work, Tb 3+ /Al 3+ co-doped and Al 3+ single doped silica glasses are taken as the research objects, and X-ray is used as the simulated light source to study the photodarkening mechanism. Detailed optical properties of the glasses before and after X-ray irradiation and the results of electron paramagnetic resonance (EPR) indicate that the photodarkening effect is attributed to the valence changes of Tb 3+ ions and the energy transfer between Tb 3+ ions and related defects. In addition, this work revealed the relationship between valence changes behavior of Tb 3+ ions and various defects in glass matrix materials, deepening the understanding of the photodarkening mechanism in Tb 3+ doped oxide glass. We envisage that our finding provides a depth-theoretical support for the synthesis of Tb 3+ -doped oxide matrix glass fibers with excellent optical and anti-photodarkening performance.
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高影响因子
CARBON
·
2023
·
IF 10.9
Xia Wang,Taifeng Shi,Chunlei Wan,Peng-an Zong,Zhenguo Liu,Wei Huang
Electromagnetic interference (EMI) shielding materials play a crucial role in safeguarding the reliable operation of electronic devices against electromagnetic waves (EW). Nevertheless, electronic devices inherently generate heat, and thermoelectric (TE) can convert heat into electricity, making them attractive as clean energy sources. Therefore, there is an increasing demand for high-performance EMI shielding materials with excellent TE properties. These materials can effectively mitigate EW pollution while simultaneously harnessing heat as electricity. Carbon cloth (CC) as one type of functional textile , has been widely explored as a potential material for EMI shielding, but rarely reported for TE application, due to low Seebeck coefficient . In this study, a facile electrodeposition method was employed to coat Bi 2 Te 3 layers onto the carbon fibers within carbon cloth. This innovative approach not only significantly improved the EMI shielding efficiency from 17.0 dB to an impressive 42.7 dB, but also imparted excellent TE performance to the film, as evidenced by a power factor of 42.4 μWm −1 K −2 . A four-legged TE module based on this film generates 35.5 nW of power at a temperature difference of 30 K, indicating its significant potential for powering low-consumption wearable electronics after integrating more TE legs. This study has paved the way for the development of a versatile material, that can mitigate EW pollution while simultaneously harnessing heat as electricity, by incorporating high TE performance inorganics into CC using a simple electrodeposition method.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2018
·
IF 3.046
Yanchun Hu,Tengyu Guo,Xianwei Wang,Yawen Cui,Weixia Li,Xiangyu Zhao,Hongyan Liu
In this paper, the effect of Gd/Ba co-doping on magnetocaloric properties for Sr 2 FeMoO 6 is presented. Double-perovskite (Sr 2-3x Gd x Ba 2x )FeMoO 6 (0.00 ≤ x ≤ 0.20) were prepared by the solid reaction method. X-ray diffraction results showed that all samples were single phase and belonged to I4/m space group. X-ray photoelectron spectroscopy analysis of (Sr 2−3x Gd x Ba 2x )FeMoO 6 samples showed that proportional variations in Fe 3+ /Fe 2+ and Mo 5+ /Mo 6+ were found under Gd/Ba co-doping. Field-cooled magnetization curves indicated that Gd/Ba co-doping led to the Curie temperature ( Tc ) drop from 394 K to 357 K. Arrot plots analysis of samples revealed a second-order magnetic transition. The magnetic entropy change of all samples increased initially and then decreased with temperature, and all samples exhibited the maximum magnetic entropy change near Tc . The maximum magnetic entropy change of samples in the magnetic field of 2 T decreased from 0.72 J K −1 kg −1 to 0.54 J K −1 kg −1 because of Gd/Ba co-doping. Relative cooling power decreased correspondingly.
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高影响因子
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