Materials Today Chemistry
·
2026
·
IF 7.4
Jin Chen,Naoyuki Hatada,Wenhao Li,Wenzhuo Chen,Donglin Han
Heavily acceptor-doped perovskite oxides have the potential to activate percolation conduction of protons at reduced temperatures, and the reported percolation proton conductors up to now are restricted to the systems containing high Sc content. However, larger trivalent rare earth elements (e.g., Y) are known to be better dopants for proton conducting zirconates, but their solubility is low. In this work, we propose a new strategy to design the percolation proton conducting perovskites, by introducing La and Y into the Sr and Zr-sites of SrZrO 3 , respectively, leading to the formation of (Sr 1.1- x La x -0.1 )(Zr 1- x Y x )O 2.95 (SLZY, x = 0.1 – 1.0), which takes Pnma and Pna 2 1 orthorhombic structures with x = 0.1 – 0.4 and 0.5 – 1.0, respectively. Interestingly, the conductivity decreases with the Y content increasing from 0.1 to around 0.7 and increases with the Y content further increasing to 1.0. Moreover, the activation energy of the bulk conduction shows the maximum value at x = 0.6. In addition to the expected monotonically increasing activation energy resulted from the enhanced structural asymmetry, these results imply that the trapping effect of protons plays an important role, which is enhanced with Y content increasing from 0.1 to around 0.6. Notably, higher Y content (e.g., x > 0.6) appears to activate the percolation conduction of protons, leading to the decreasing activation energy.
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CHINESE JOURNAL OF CATALYSIS
·
2026
·
IF 17.2
Yun Huang,Qi Chen,Yueling Chen,Zefeng Yang,Jionghua Wu,Jimmy C. Yu,Ling Wu
The generation of active hydrogen species (H*) is an essential step in the photocatalytic conversion of nitrogen molecules (N 2 ) to ammonia (NH 3 ). Metal-organic frameworks (MOFs) are versatile porous structures but they do not exhibit sufficient photocatalytic activities for nitrogen fixation. Adding appropriate amounts of noble metal species as a cocatalyst to MOFs can often improve their activities. This work uses a photoreduction strategy to reduce the right amount of Pt 4+ to Pt clusters, and confines the remaining Pt 4+ uniformly onto DUT-67(Zr). This is realized by taking advantage of a unique Pt-S electron channel, and the unsaturated Zr sites are concurrently in-situ generated under light exposure. The unsaturated Zr sites adsorb and activate N 2 , while the Pt clusters are involved in the water splitting process on DUT-67(Zr) to generate more H*, leading to continuous H* supply that would speed up the catalytic hydrogenation of nitrogen intermediate NH x . The Pt-S electronic channel formed between highly dispersed single atoms Pt and DUT-67(Zr) facilitates the separation and transfer of photo-generated charge carriers. Consequently, with the synergistic effect of unsaturated Zr sites, Pt clusters and Pt-S electron channels, a high photocatalytic nitrogen fixation performance of 78.8 μmol g ‒1 h ‒1 can be achieved. This is 10.4 times higher than that of the sample DUT-67-L with only unsaturated Zr sites and no Pt loading. This work provides an insight to rational design of uniform dispersed precious metal-based MOF photocatalyst for efficient photocatalytic ammonia synthesis.
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TALANTA
·
2025
·
IF 6.1
Muhammad Hussnain Afzal,Wajeeha Pervaiz,You Xu,Nomair Elahi,Zhuo Huang,Guangfang Li,Hongfang Liu
The widespread use of acetaminophen (AP) has resulted in its frequent presence in pharmaceutical waste, posing ecological and health risks. To address this, a voltametric sensor based on a bimetallic UiO-66-NH 2 metal-organic framework incorporating Zirconium (Zr) and Cerium (Ce) was developed for sensitive AP detection. The incorporation of Ce 3+ not only introduced redox active sites but also reduced the particle size from 495-650 nm in (Zr)UiO-66-NH 2 to 230–365 nm in (Zr/Ce)UiO-66-NH 2 , increasing surface area and enhancing electrocatalytic activity. The combined synergistic effect of Zr and Ce significantly improved charge transfer and enhanced oxidation current response compared to the unmodified GCE. The sensor exhibited excellent electrocatalytic performance with a wide linear range (0.072–680 μM), high sensitivity (0.496 μAμM −1 cm −2 ), and a low limit of detection (0.024 μM). In addition, the sensor exhibited excellent selectivity against interfering species and maintained stable performance over 21 days. The sensor's practical applicability was validated by testing real environmental samples, achieving recovery rates of 97–103 %, and the results were consistent with those obtained using high-performance liquid chromatography (HPLC).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Honghao Su,Jingwei Hou,Junyong Zhu,Yatao Zhang,Bart Van der Bruggen
Zr IV -based metal–organic frameworks (MOFs) featuring distinguished water stability, large surface area, and intriguing functionalities have immense potential for practical usage. However, conventional MOF synthesis approaches generally require high reaction temperatures and organic solvents to initiate and template the nucleation and growth, hindering sustainable and cost-effective manufacturing and application of Zr-based MOFs. In this study, a scalable, room-temperature and aqueous synthesis of MOF-808—a Zr-MOF extensively explored as an adsorbent in both academic and industrial sectors—was reported. A rational use of water/formic acid (FA) as a green co-solvent enabled the formation of Zr 6 -cluster in an aqueous phase, thereby facilitating subsequent coordination with H 3 BTC to yield well-crystallized MOF-808. The effects of the water/FA volume ratio, the total solvent volume, and reaction time on the physicochemical properties of MOF-808 were studied. The optimized synthesis conditions (FA/water = 2.7:8.1, and reaction time = 24 h) resulted in the synthesis of MOF-808 with good hydrophilicity, excellent stability, high surface area, and weak positive charges. Moreover, this synthesis approach was successfully upscaled, yielding 11.5 g of MOF-808 at a magnification factor of 48. Notably, MOF-808-V 10.8 exhibited an impressive adsorption capacity for Congo Red (ca. 1500 mg/g) and demonstrated selective fractionation of dye mixtures, suggesting their potential application in dye wastewater treatment. This methodology is expected to provide guidance for aqueous and scalable fabrication of Zr-MOFs towards water-related environmental applications.
研究领域:
材料科学
·
环境科学
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TALANTA
·
2026
·
IF 6.1
Chu Zeng,Hong-Tao Jiang,Ming Xu,Zhi-Yuan Gu
Flexible metal–organic frameworks (MOFs) with dynamic adaptability offered exciting opportunities for advanced separation, yet their tendency to undergo void collapse severely limited their application as gas chromatography (GC) stationary phases. Here, we overcame this challenge by stabilizing the scu -topology Zr-MOF NU-903 through a linker installation strategy. By incorporating biphenyl-4,4′-dicarboxylic acid (BPDC) into the vacant coordination pockets along the c-axis, the resulting material, NU-903-BPDC, exhibited markedly enhanced stability and structural rigidity, retaining its porosity even at 250 °C. Comprehensive characterization confirmed that the original structure was preserved, while framework flexibility was effectively suppressed. Fluorescence spectroscopy further revealed restricted ligand dynamics, corroborating the rigidified framework environment. When employed as a GC stationary phase, NU-903-BPDC delivered significantly improved resolution for C 7 hydrocarbons and dichlorobenzene isomers, benefitting from stronger thermodynamic interactions and reduced band broadening. Crucially, NU-903-BPDC maintained stable separation performance after thermal treatment, in sharp contrast to the pronounced degradation observed for pristine NU-903. This work demonstrated linker installation as an effective strategy to modulate framework flexibility, opening a general pathway toward robust, high-performance MOF-based stationary phases for chromatographic separations.
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Defence Technology
·
2020
·Vol. 17
·期 2
·467-477
·
IF 2.637
Lu-yao Wang,Jian-wei Jiang,Mei Li,Jian-bing Men,Shu-you Wang
Projectiles made of reactive structure materials (RSM) can damage the target with not only kinetic but also chemical energy, but the enhanced damage potential of RSM may become compromised if extreme loading condition disintegrates the projectile before the target is reached. In this work, a ductile coating of Ni was introduced to a tungsten-zirconium (W-Zr) alloy, a typical brittle RSM, to preserve the damage potential of the projectile. Detonation driving tests were carried out with X-ray photography and gunpowder deflagration driving tests were carried out with high-speed photography for the coated and uncoated RSM samples, respectively. The craters on the witness target were analyzed by scanning electron microscopy and X-ray diffraction. The Ni coating was found to effectively preserve the damage potential of the W-Zr alloy under extreme loading conditions, whereas the uncoated sample fractured and ignited before impacting the target in both detonation and deflagration driving. The crack propagation between the reactively brittle core and the ductile coating was analyzed based on the crack arrest theory to mechanistically demonstrate how the coating improves the structural integrity and preserves the damage potential of the projectile. Specifically, the Ni coating envelops the W-Zr core until the coated sphere penetrates the target, and the coating is then eroded and worn to release the reactive core for the projectile to damage the target more intensively.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2019
·
IF 2.794
Jian Zhang,Ye Tian,Jiawen Zhu,Yi Sun,Guoqiang Luo,Qiang Shen,Lianmeng Zhang
In this study, the W-HfC-Zr composites with various Zr content were fabricated via plasma activated sintering. The relative density, microstructure, microhardness , as well as mechanical properties of these composites were investigated. The W-HfC-Zr composite with 1.0 wt% Zr content had high relative density of 97.56%, exhibited the higher microhardness of 614 Hv, compressive yield strength of 1.85 GPa and bending strength of 880 MPa, which attributing to Zr captured impurity oxygen and generated solid-solution oxide (Hf, Zr)O. The enhancement mechanisms of trace Zr addition on microstructure and mechanical properties were proposed.
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AICHE JOURNAL
·
2026
·
IF 4.4
Tingting Yan,Senlin Deng,Jie Li,Guoliang Zhang,Gang Wang,Chunshan Li
Significant attention is paid to methyl methacrylate (MMA) synthesis via direct aldol reaction on supported Cs-based catalysts; however, the structure of active sites is still unclear. Herein, the structural sensitivity of Zr sites toward MMA production through aldol condensation of methyl propionate with formaldehyde on Cs/Zr/SiO 2 was identified, which was affected by surface hydroxyl groups on SiO 2 . Isolated hydroxyl groups were discovered to induce the formation of well-defined Zr sites, which facilitated MMA formation, while the dimeric Zr species led to the generation of undesired methylacrolein (MAL) byproduct. It was demonstrated that a higher proportion of medium and strong Lewis acid sites could suppress MAL production through sequential H-transfer hydrogenolysis and condensation reaction. As a result, the selectivity and formation rate of MMA could be promoted by ~30% and ~2.5 folds after Zr site modification. Therefore, the local structure of active components is critical to the regulation of catalytic performance in MMA production.
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 34
·15374-15386
·
IF 7.6
Li Chenguang,Zhou Mingjun,Li Yuchen,Wang Xue,Wang Lei,Fang Cheng,Wu Gongde,Ding Jing,Wan Hui,Guan Guofeng
Direct conversion of CO 2 into ethanol represents a promising route toward carbon neutrality. In this study, a series of Zr-modified K-FeCu/MWCNT catalysts were developed for efficient and selective CO 2 hydrogenation to ethanol. The introduction of Zr promoted ethanol formation primarily by diversifying the reaction pathways toward ethanol and enhancing the dispersion of active phases. The electronic interactions among Zr, Fe, and Cu significantly reduced the particle sizes of the Fe and Cu phases and effectively restrained their migration and agglomeration. Furthermore, ZrO 2 served to adsorb and activate in situ generated CO, which subsequently coupled with CH x * species on the Fe 5 C 2 surface to yield C 2+ oxygenated intermediates, thereby favoring ethanol formation. Under the reaction conditions of 320 ° C, 4 MPa, and 6000 mL·g cat –1 ·h –1 , the Zr-modified K-FeCu/MWCNT catalyst exhibited a 44.39% higher space-time yield (STY) of ethanol than its unmodified counterpart. This performance considerably surpasses that of most Fe-based catalysts reported to date, providing insights and design strategies for developing high-performance catalysts for CO 2 hydrogenation to ethanol.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Zheng-Yao Li,Rui Gao,Limei Sun,Zhongbo Hu,Xiangfeng Liu
In this work, Zr 4+ doped P2-Na 0.75 Mn 0.55 Ni 0.25 Co 0.05 Fe 0.10 Zr 0.05 O 2 has been synthesized and investigated as high-rate sodium-ion battery cathode material for the first time. XRD results indicate that Zr-ion with a big size cannot completely dissolve into the crystal structure, but the residual ZrO 2 shows little impact on the electrochemical performance in comparison with the post-added ZrO 2 . With the substitution of Zr 4+ for Fe 3+ , the lattice parameter a decreases but c increases, resulting in the reduced lattice volume. In comparison with the Zr-free sample, Na 0.75 Mn 0.55 Ni 0.25 Co 0.05 Fe 0.10 Zr 0.05 O 2 (Zr05) can deliver a discharge capacity of about 95, 74, 61 and 53 mAh g −1 at 2C, 5C, 8C and 10C. At the current density of 2C, the capacity retention after 100 cycles has increased from 57% of Zr0 to 74% of Zr05. The results demonstrate that Zr-ion substitution can effectively improve the rate performance and cycling stability of P2-structure cathode materials. The role of Zr 4+ can be summarized as follows: (1) Zr-O ( △H f 298K (Zr-O) = 760 kJ mol −1 ) has a stronger bond energy than that of Fe O ( △H f 298K (Fe-O) = 409 kJ mol −1 ), which enhances the structure stability and cycling performance; (2) the aliovalent substitution of Zr 4+ for Fe 3+ enhances the electronic conductivity, which is favorable for the rate capability; (3) the substitution of Zr 4+ for Fe 3+ can be beneficial to Na + conduction because it increases disorder in the transition metal (TM) layers and can prevent Na+/vacancy ordering, which further enhances the rate capability.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
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RARE METALS
·
2017
·Vol. 36
·期 12
·934-941
·
IF 1.189
Yong Yao-Wei,Fu Wei,Deng Qi-Lin,Yang Jian-Guo
By adding mixture of ZrO 2 and carbon, a Zr-enhanced composite coating was produced onto an AISI 1045 substrate by laser cladding. The microstructure and phase formation, microhardness and wear resistance of the composite coating were studied. The experimental results indicate that the composite coating with metallurgical bonding to substrate consists of γ-Ni, massive ceramic particles of ZrC, NiZr 2 , Ni 7 Zr 2 , (Fe, Ni) 23 C 6 and Fe 3 C. The in situ-synthesized ZrC particles are uniformly dispersed in composite coating, which refines the microstructure of composite coating. With different ZrO 2 and carbon additions, the properties are improved differently. Finally, the fine in situ ZrC particles improve the microhardness of composite coating to HV 0.2 650, which is nearly 2.7 times that of Ni25 coating. Also, the composite coating has an advantage in wear resistance; it offers better wear resistance when more mixture of ZrO 2 and carbon was added in nickel alloys.
研究领域:
材料科学
·
金属学与热处理
·
表面工程
·
先进制造
·
复合材料
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Wei Man,Shuo Zhang,Yunlong Wang,Mengjun Wang,Chongjiang Cao,Linyu Nian
The metabolic processes of fruits induce water vapor condensation in packaging, creating a high-humidity microenvironment that exacerbates the proliferation of microorganisms and causes food spoilage. Therefore, a Fe/Zr bimetallic organic framework (Fe-MOF-801) packaging (i.e., FeMGCF) with high binding stability to transpiration water was prepared based on transition metal Fe doping strategy, and the mechanism of its enhanced binding stability towards transpiration water was investigated. The results indicate that Fe enhances the interaction between MOFs and H 2 O by promoting the charge depletion at the O sites coordinated with Zr, thereby increasing the aggregation tendency of H 2 O in the T 1 and T 2 cavities (characterized by strong hydrogen bonding) of Fe-MOF-801, which increased the binding energy of MOFs to H 2 O by 29.6 %. Accordingly, the application of FeMGCF packaging extended the shelf life of tomatoes by 6 days and delayed the degradation of lycopene and anthocyanins during postharvest tomato preservation.
研究领域:
材料科学
·
食品科学
·
化学
·
农业
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