DALTON TRANSACTIONS
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2022
·Vol. 51
·期 12
·4685-4694
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IF 4.569
Guixian Li,Yu Xue,Qinan Mao,Lang Pei,Hong He,Meijiao Liu,Liang Chu,Jiasong Zhong
Luminescent thermometers provide a non-contact method of probing temperature with high sensitivity and response speed at the nanoscale. Synergistic photoluminescence from different activators can realize high sensitivity for luminescent thermometers by finely selecting ions with specific crystallographic sites. Herein, the more temperature-sensitive Mn4+ and the less-sensitive Eu3+ (or Sm3+) activators are co-doped into a Ca2GdSbO6 matrix to form an effective thermometer, where Mn4+ and Eu3+ (or Sm3+) ions occupy the Sb5+ and Gd3+ sites, respectively. The co-doping of Eu3+ ions or Sm3+ ions leads to lattice expansion of Ca2GdSbO6 matrix and a tuned narrow emission from deep-red to orangish-red. According to the ratio of luminescence intensity, the maximal Sa and Sr values are 0.19 K−0 (347 K) and 1.38% K−( (420 K) for Ca2GdSbO6:Mn4+/Eu3+ probe and 0.26 K−p (363 K) and 1.55% K−( (430 K) for Ca2GdSbO6:Mn4+/Sm3+ probe thermometers, respectively. In addition, thermometers based on Mn4+ emission lifetimes can provide the highest relative sensitivity of 1.47% K−s at 425 K. Thus, the highly-temperature-sensitive Ca2GdSbO6:Mn4+/(Eu3+ or Sm3+) phosphor is a promising candidate for practical luminescence thermometers.
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ACS Catalysis
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2025
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IF 13.1
Guihua Yan,Paulina Pršlja,Gaofeng Chen,Jiahui Kang,Yongde Liu,Miguel A. Caro,Xi Chen,Xianhai Zeng,Bo Peng
Syngas conversion into higher alcohols represents a promising avenue for transforming coal or biomass into liquid fuels. However, the commercialization of this process has been hindered by the high cost, low activity, and inadequate C2+OH selectivity of the catalysts. Herein, we have developed Cu/Co carbon wood catalysts, offering a cost-effective and stable alternative with superior selectivity for catalytic conversion. The formation of Cu/Co nanoparticles was found, influenced by water-1,2-propylene glycol ratios in the solution, resulting in bidisperse nanoparticles. The Cu/Co-CW-W1P1 catalyst (the ratio between water and 1,2-propanediol is 0.5:0.5) exhibited a remarkable CO conversion rate of 74.8% and a selectivity of 58.7% for C2+OH, primarily comprising linear primary alcohols. This catalyst demonstrated enduring stability and selectivity under industrial conditions, maintaining its efficacy for up to 350 h of operation. We also employed density functional theory (DFT) to analyze selectivity, particularly focusing on the binding strength of CO, a crucial intermediate for subsequent reactions leading to the formation of alcohols. DFT identified the pathway of CHx and CO coupling, ultimately yielding C2H5OH. This computational understanding, coupled with the high performance of the Cu/Co-carbon wood catalyst, paves the way to develop catalytically selective materials tailored for higher alcohol production from a nature-based source.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Fangqing Liu,Xiaoyi Lu,Chenglong Shi,Di Wang,Tingting Cui,Zhipeng Sun
Developing high-efficiency non-precious metal-based catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a major task for Zinc-air batteries (ZABs). Cobalt-based catalysts have been regarded as promising catalysts owing to the multivalence characteristic of the Co element, however, there remains the agglomeration of Co particles during the high-temperature calcination process and the strong adsorption of oxygen intermediates. Herein, the synthesis of Y 2 O 3 -La 2 O 3 co-modified Co nanoparticles embedded within the porous N-doped carbon substrate derived from a metal-organic framework precursor is reported ((Y 1 La 1 )O/Co-NC). Notably, this strategy allows Y 2 O 3 -La 2 O 3 to uniformly distribute around Co nanoparticles and to form intimate Y 2 O 3 -La 2 O 3 /Co interface sites. Benefiting from Y 2 O 3 -La 2 O 3 co-modification, the synergistic effect of the heterostructures, and abundant active sites, the optimized (Y 1 La 1 )O/Co-NC catalysts exhibit a higher half-wave potential (E 1/2 = 0.845 V) than commercial Pt/C (E 1/2 = 0.828 V). In addition, the potential gap between OER and ORR potentials is 0.78 V. As a cathode catalyst for ZABs, (Y 1 La 1 )O/Co-NC achieved a specific capacity of 955.73 mAh g −1 . Theoretical calculations have also revealed that the introduction of Y₂O₃ and La 2 O 3 promotes electron transfer and increases the electron density at Co sites. The interface effect of Y 2 O 3 -La 2 O 3 /Co optimizes the adsorption strength of oxygen intermediates, significantly reduces the reaction energy barrier, and enhances oxygen electrocatalysis. This study offers significant insights into the strategy of employing rare earth metals to boost the performance of cobalt-based catalysts in ZABs.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Qingfang Jiang,Wujian Zhang,Weijian Ge,Yiping Jin,Wenfeng Han,Ying Li,Haodong Tang
Sintering deactivation of loaded precious metal catalysts is a pressing issue in the field, significantly reducing catalyst activity. Among them, the redispersion of carbon-loaded precious metal catalysts under a high-temperature atmosphere suffers from the problem of carbon carriers being prone to carbonization. In this study, the sintered PdZn/AC catalysts could be redispersed at low temperatures by adding the additive Zn. Combined with TEM, XRD, XPS, and other characterization means, it was found that the main reason for the redispersion of the sintered catalysts was that the Zn additive could form an alloy with Pd, which promoted the formation of high-valent Pd species, which exfoliated into small particles by oxidation in the O 2 –CO atmosphere. In addition, the factors that influenced the process (Zn content, redispersion temperature, treatment time, and number of treatments) were investigated using the controlled variable method. The present work presents a new idea for recycling sintered precious metal catalysts.
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RENEWABLE ENERGY
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2025
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IF 9.1
Hongming Liu,Junhao Cui,Zhiyang Zhao,Yongqi Ren,Bailong Chen,Longzhi Li
The traditional utilization of lignin mainly relies on direct combustion, which leads to low energy efficiency and environmental pollution, becoming a key bottleneck restricting the efficient utilization of all components of lignocellulose. This paper introduced a new strategy of microwave-assisted lignin hydrogenolysis over bifunctional catalyst Fe-Co/AC to achieve high-value conversion of lignin. This article firstly investigated the hydrogenolysis characteristics and product distribution patterns in the presence of Fe-Co/AC through catalyst characterization and adsorption calculation, as well as hydrogenolysis experiments. The results showed that the formation of Fe-Co alloy in the catalyst resulted in highly catalytic activity and selectivity for the hydrogenolysis process. Next, the intrinsic effects of solvent hydrogen donors and microwaves on lignin hydrogenolysis were discussed, through comparative experiments of hydrogenolysis in absence of catalyst and microwave-assisted pyrolysis. Lastly, attention was paid to calculate the adsorption characteristics and bond length changes of different substrates under metal components in order to reveal the mechanism of Fe-Co for synergistic catalyzing lignin hydrogenolysis, and to propose a potential pathway for lignin directed conversion into phenol. The findings provide a new approach for efficient bond breaking and intermediates hydrogenation of solid wastes such as lignin and plastics to obtain high value-added products.
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NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Zhile Xiong,Yuewen Chen,Weidong Xie,Jiali Huang,Xiaoli Zhang,Xiya Zhang,Hai Liu
The electrocatalytic reduction of CO2 using renewable electricity offers a sustainable approach for the production of valuable chemicals. However, this process is often hindered by low catalytic activity and poor selectivity. In this study, we have developed a novel electrocatalyst that integrates ZIF-8-regulated ZnO interfaces, undercoordinated surface sites, and mesoporous nanostructures. This design enabled the ZnO/ZIF-8 catalyst to achieve excellent CO2 conversion performance, with a CO2 Faraday efficiency of more than 91% over the potential range of -1.0 V to -1.6 V and a high current density compared to reversible hydrogen electrodes. At the optimal potential of -1.4 V, the CO Faraday efficiency reaches 95.57%, accompanied by a current density of -8.16 mA/cm2. The porous nature and superior CO2 adsorption ability of the ZIF-8 shell layer foster an optimal setting for CO2 conversion while enhancing the exposure of active sites. Additionally, the synergistic coupling of ZnO and ZIF-8 interfaces fine-tunes the electronic structure of the active sites, thereby enhancing CO2RR efficiency.
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Journal of Environmental Sciences
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2025
·
IF 6.3
Menghe Lou,Li Xiang,Guo Nie,Xueqing Luo,Renna Li,Feng Bi,Xiaole Weng,Zhongbiao Wu
The removal of carbon monoxide (CO) from sintering flue gases remains a significant challenge in industrial gas purification, requiring efficient catalytic systems. This study explores the use of TiO 2 synthesized under supercritical conditions in copper-based catalysts for low-temperature CO oxidation. Experimental results showed enhanced catalytic activity, with complete CO conversion at 120°C, primarily due to a higher Cu⁺ concentration in the catalyst. Characterization techniques (XPS, EPR, CO-DRIFT) confirmed a substantial increase in the Cu⁺ ratio in Cu/sc-TiO 2 (78%) compared to Cu/TiO 2 (71%) before thermal treatment. Additionally, the Cu/sc-TiO 2 -A catalyst exhibited smaller particle size and better dispersion, which contributed to the elevated Cu⁺ ratio after preheating. Thermal treatment increased the Cu⁺ ratio by 11% in Cu/sc-TiO 2 -A, compared to just 3% in Cu/TiO 2 -A, leading to a final Cu⁺ ratio of 89%, which enhanced catalytic activity. DRIFT and TPSR analyses indicated that the Cu/sc-TiO 2 catalyst generated CO during heat treatment, creating a micro-reduction environment that optimized copper valence states and active sites. This study highlights the potential of continuous hydrothermal flow synthesis for modulating catalyst valence states in industrial applications.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2025
·
IF 14.3
Zixuan Wang,Zirui Jia,Junwen Ren,Li Wang,Di Lan,Siyuan Zhang,Xuetao Shi,Xuehua Liu,Zhenguo Gao,Guanglei Wu
The study of delicate nano-topological structures has been a prominent area of research, largely due to the distinctive electromagnetic characteristics of this structure. However, the relationship between topological transformations, material properties, and electromagnetic wave (EMW) absorption performance remains insufficiently understood. In this study, a series of carbon fiber-based Co/MnO nanocomposites is derived from Co/Mn bimetal Prussian blue analogs encapsulated in polymer nanofiber networks by electrospinning. It has been demonstrated that various topological shapes can be modulated by modulating surfactants, thereby changing the degree of graphitization and electrical conductivity. The optimized spherical precursor composite carbon fiber exhibits superior EMW absorption capability with minimum reflection loss (RL min ) of −58.15 dB with a thickness of 2.3 mm. Moreover, ultrabroad effective absorption bandwidth (EAB) as large as 8.96 GHz is obtained. This work offers a significant contribution to the field of topology, while also promoting the development of manganese-based microwave-absorbing materials (MAMs) with enhanced electromagnetic absorption properties.
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Electronic Materials Letters
·
2025
·
IF 2.6
Zhang Ligang,Xu Xiaoming,Ma Lihong,Wang Haosen
A series of Er 3+ /Eu 2+ -activated SrS/SrZnSO with different Er 3+ /Eu 2+ concentrations were synthesized at 1300℃ for 3 h through high temperature solid-state reaction, and their persistence luminescence and mechanoluminescence properties were studied. Upon 450 nm laser excitation, SrS/SrZnSO:Er 3+ /Eu 2+ emitted orange-red light, which could be observed with the naked eyes. When the laser was removed, it showed long afterglow orange-red luminescence. The brightness and duration of the long afterglow increase with the increase concentration of Er 3+ /Eu 2+ from x:y = 0.5%:1% to 3%:1%. SrS/SrZnSO:Er 3+ /Eu 2+ was confirmed as an excellent persistent luminescence material since it could continuously emit light for nearly 10 min. Moreover, under pressure stimulation SrS/SrZnSO:Er 3+ /Eu 2+ showed a novel type of mechanoluminescence (ML) with the emitting bright green light which linearly depended on the force. Under the same force of friction, the sample SrS/SrZnSO:Er 3+ /Eu 2+ with Er 3+ /Eu 3 = 1%:0% emitted the strongest ML among prepared samples. Furthermore, the mechanism of mechanoluminescence was studied in details. This study can expand the family of ML materials while promoting the applications of mechanoluminescence materials in damage diagnosis, human-machine interfaces, and pressure sensing. Graphical
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Soft Matter
·
2025
·
IF 2.8
Yun-song Zhou,Yang Sheng,Peng Zhang,Rong Zhang,Mark Bradley,Yi-xin Sun
The self-assembly of small molecules into supramolecular hydrogels is of great significance in mimicking biological systems. In this study, we investigated the formation and structure change of supramolecular hydrogels based on the self-assembly behavior of an achiral coumarin derivative (G1) and a chiral phenylalanine derivative (ALP). It was observed that G1 and ALP can self-assemble at various molar ratios, resulting in distinct nanostructured morphologies. Specifically, at a molar ratio of G1/ALP (4 : 1), the achiral G1 molecules initially bifurcate and diverge, ultimately forming a dendritic microstructure at the G1 termini. When the G1/ALP ratio was adjusted to 2 : 1, a chrysanthemum-like microstructure emerged. UV-light can destroy the self-assembled gel structure of different G1/ALP ratios, changing it from gel to sol. The emergence of these higher-order chiral structures during self-assembly was attributed to hydrogen bonding and π–π stacking interactions between the molecules. This research offers valuable insights into the understanding of biological self-assembly processes and the design of artificial biomedical materials.
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高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Shengyu Wu,Zhongran Wu,Guofeng Li,Yongkai Liao,Shanna Lin,Zhao Liu,Chao Cai
The transport behavior of pollutants under dynamic groundwater conditions has attracted significant attention recently. However, there is limited research on the simultaneous effects of groundwater table fluctuations on the transport of co-existing pollutants, especially combined dense and light non-aqueous phase liquids (DNAPLs and LNAPLs). In this study, column experiments investigated toluene and dichloromethane transport in a controlled water table system with varying fluctuation conditions. Results showed that both dichloromethane and toluene accumulated near the groundwater table under static water table conditions, but the concentration of dichloromethane declined more rapidly than toluene due to differences in their physicochemical properties, such as solubility, density, and hydrophobicity. Groundwater fluctuations facilitated pollutants transportation towards deeper layers, potentially resulting in unforeseen increases in pollutant volatilization and downward fluxes. The interactions between dichloromethane and toluene, including competitive adsorption, enhanced dissolution, and altered kinematic viscosities, resulted in the reduced transport potential of dichloromethane while enhancing that of toluene. Furthermore, compared to dichloromethane, the initial upward fluctuation of the water table had a more pronounced impact on toluene due to its lower solubility and volatility. The downward transport risk index assessment indicated that among various factors considered, groundwater fluctuation amplitude exerted the most significant influence on pollutant migration risk. These new findings will provide important insights into understanding and assessment of the potential transport risk associated with combined LNAPLs and DNAPLs in the natural environment.
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PubMed
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FOOD HYDROCOLLOIDS
·
2025
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IF 12.4
Yaping Liu,Chenxin Huang,Jiajie Wang,Xianchao Feng,Meihu Ma
Egg white proteins exhibit high thermal susceptibility to undesired aggregation, which limits their processing utility. In this study, the thermally regulated co-aggregation mechanism between ovotransferrin (OVT) and ovalbumin (OVA) was systematically investigated. Turbidity kinetics and particle size distribution results showed that the initial aggregation occurred at 55°C, induced by 4.3% disulfide cleavage and a 38.9% enrichment of β-sheet ( P < 0.05). Size exclusion chromatography results showed that this structural unfolding was mainly due to OVT molecules. The structurally activated OVT then specifically anchored the double cavities of OVA. Subsequently, upon heating at 60 - 65°C, the β-sheet reverted to the α-helix as detected by CD and FTIR spectroscopy, and the hydrophobic tyrosine and phenylalanine residues were reburied as detected by fluorescence spectroscopy, forming reversible metastable aggregates. At temperatures above 65°C, the larger heteroprotein complex (∼1.5 μm) emerged. ITC results showed that the co-aggregation was entropy-driven ( TΔS = +45.5 kJ/mol) with a stoichiometric ratio of 2:1 (OVT: OVA, n = 2.19 ± 0.12). Molecular docking and interaction force analyses revealed covalent disulfide bonds and multiple non-covalent bonds involved in this process. Notably, OVT acted as the aggregation initiator and governed the reverse aggregation, whereas OVA provided the structural backbone. These results provided a theoretical basis for the precise regulation of complex functional properties in the food industry.
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