Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 21
·12599-12608
·
IF 10.7
Yiming Yang,Jiachen Lu,Xinyu Zhang,Yanuo Shi,Peng Du,Xiao Ling,Nan Yang,Qianli Chen
Y-doped Ba(Zr,Ce)O3 (BZCY) proton conducting ceramics have attracted extensive attention because of their promising applications as electrolytes for intermediate-temperature proton ceramic electrochemical cells. The proton conductivity of BZCY is governed by their lattice volume and crystal symmetry; however, systematic studies of the competition between these two factors are lacking, hindering further improvement of their proton conductivity at low and intermediate temperatures. In this work, the crystal symmetry of BZCY epitaxial films deposited on NdGaO3 (110) is compared to that of polycrystalline bulk BZCY based on Raman spectra. The Raman signal of BZCY epitaxial films is amplified using surface-enhanced Raman spectroscopy and subsequently extracted utilizing the nonnegative matrix factorization method. The relative Raman intensity ratio of the BO6 octahedra motion to the Ba-BO6 relative motion in the ABO3 structure indicates that as the Ce content increases, the crystal symmetry of polycrystalline bulk BZCY decreases, whereas that of the epitaxial films on NdGaO3 remains consistently lower compared to bulk BZCY. The relationship between the activation energy and relative Raman intensity of epitaxial films and bulk BZCY indicates quantitatively that higher activation energy is observed in the crystal structure with lower symmetry. This work suggests that crystal symmetry has a predominant effect on the activation energy of BZCY. The results provide a deeper insight for developing proton conducting electrolyte membranes with high proton conductivity and low activation energy.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-9
·
IF 2.8
Song Peiqi,Zhu Zhe,Yao Zhonghua,Hao Hua,Cao Minghe,Liu Hanxing
Piezoelectric materials are widely used in the direction of sensors. PZT-based ceramics are very suitable for precision sensors. However, due to the low Curie temperature, the application temperature range of the material is relatively narrow. Here we show a high-performance material 0.6PZT–0.4PNN. In this case, a morphotropic phase boundary (MPB) region was artificially designed in the 0.6Pb(Zr x Ti 1 −x )O 3 –0.4Pb(Ni 1/3 Nb 2/3 )O 3 ( x = 0.35–0.41) ceramics to develop high-performance piezoelectric compositions which could cofire with low-cost Ag/Pd inner electrode by 0.2wt% Li 2 CO 3 addition. The ceramic composition at x = 0.39 near MPB possess exceptional properties with high piezoelectric coefficient d 33 ∼ 611 pC/N, planar electromechanical coupling coefficient k p ∼ 53.5%, low mechanical quality factor Q m ∼ 64.5 piezoelectric strain of 0.17%, and suitable Curie temperature T c ∼ 191 °C, respectively. The fact that d 33 was detected close to T c , and no noticeable change below 6.6% in cycling stability was observed at 20 kV/cm means a robust temperature-independence and fatigue reliability of the piezoelectric ceramics. Thus, this research provides a novel high-piezoelectricity configuration with elemental regulation, comparable to the commercial PZTs.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2025
·
IF 3.1
Li Kaiqian,Zhang Xupeng,Li Xianghong,Chang Qiaowen,Deng Shuduan,Zhu Gang
Introducing novel bimetallic metal–organic frameworks (Cu/Zr-MOF) into wood cellulose scaffolds via an in situ growth strategy represents an effective approach to enhance the fire retardancy of wooden products. This work evaluates the effects of Cu/Zr-MOF loading content embedded in wood composite on the MOF morphology and flame retardancy of natural wood (NW). We discovered that MOF loading has a significant impact on the morphology of Cu/Zr-MOF. Specifically, with an increase in the amount of MOF precursors, the morphological transformation is from spherical to regular octahedra. Furthermore, the incorporation of high MOF loading remarkably enhanced the thermal stability at the early stage and exhibited significantly improved residual content. With 24 mass% loading of Cu/Zr bimetallic MOF, the highly flame-retardant wood composite (Cu-U-W-3) was obtained. Compared to pure NW, the peak heat release rate (pHRR) and total heat release (THR) were reduced to 25.25 W g −1 and 5.0 kJ g −1 , respectively. The limiting oxygen index (LOI) of the treated sample reached 24.81%, showing outstanding self-extinguishing ability. According to the char residue analysis, it was found that Cu-Zr bimetallic MOF anchored on the cell wall exhibited catalytic carbon-forming effect, thereby facilitating the generation of high-quality residual char. The enhanced fire safety of natural wood can be attributed to the oxygen barrier and the reduced heat transfer characteristics of the dense carbon layer. This work presents a novel methodology for the fabrication of bimetallic MOF hybrid flame retardants, with the objective of enhancing the flame retardancy of wooden products.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 8
·1-19
·
IF 3
Ou Qianhui,Xiong Yan,Chen Li,He Deyong,Zhou Chuxiang,Wang Lan
The nanocomposite materials are highly promising candidates for adsorption applications in dyed wastewater due to their distinctive structural properties. In this work, the nanocomposite hybrids of UiO-66@GO were first synthesized by specifically anchoring Zr-based metal organic framework (MOF) of UiO-66 onto graphene oxide (GO) nanolayer through solvothermal method. Then the composite matrix microspheres (CMMs) of UiO-66@GO were subsequently prepared by embedding the obtained UiO-66@GO nanocomposite into sodium alginate (SA) microspheres through self-assembly cross-linking process. Finally, the prepared UiO-66@GO CMMs were applied for the adsorption of organic dye pollutant and showed efficient water purification performance. As a result, the UiO-66@GO CMMs exhibited selective cationic dye adsorption for Rhodamine B (RhB + ). The experimental results revealed that the adsorption kinetics followed by the pseudo-second-order (PSD) model with rate constant k 2 = 0.95 × 10 –3 g mg −1 min −1 , and the thermodynamics followed by the Langmuir model with adsorption capacity of 345.66 mg mg −1 . Notably, the UiO-66@GO CMMs demonstrated excellent adsorption removal of a significant removal efficiency of 98% towards 10 ppm Rh-B and a rapid adsorption response time of ~ 5 min. Meanwhile, the UiO-66@GO CMMs maintained long-term stability with adsorption efficiency > 95% over 30 days and effective reuse with resorption efficiency > 90% using DMF-H₂O as eluent. In this study, SA has served as a porous supporting matrix to immobilize UIO-66@GO nanoparticles, having mitigated issues of aggregation and leaching common to nanoscale adsorbents while improving reusability. The synergistic effect between UIO-66 and GO has further enhanced pollutant adsorption capacity, demonstrating significant potential for dye wastewater treatment applications.
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CHEMICAL PAPERS
·
2025
·
IF 2.5
Zhao Chun-Yan,Hu Xiu-Li,Zhou Wei
Calcium looping represents a high-temperature method designed to capture CO 2 , making it appropriate for CO 2 capture from flue gases post-combustion in power plants after combustion or for integration with fuel transformation techniques in pre-combustion CO 2 sequestration systems. This method employs solid sorbents of CaO sourced from natural limestone, leveraging the chemical interaction of CaO with CO 2 , which ultimately results in the formation of CaCO 3 , thereby facilitating effective CO 2 capture. In this research, multiple metal-incorporated CaO-based sorbents were produced through the sol–gel method. Notably, the CaO-based sorbent with a Ca/Ce doping ratio of 15 demonstrates exceptional CO 2 capture ability and stability, maintaining 13.20 mmol/g of CO 2 adsorption capacity after 20 carbonation/calcination cycles. Various characterization techniques, including X-ray diffraction (XRD), N 2 physisorption, scanning electron microscopy (SEM), high-angle annular dark field scanning transmission electron microscopy/energy dispersive spectroscopy (HAADF-STEM/EDS), temperature-programmed-desorption with CO 2 (CO 2 -TPD), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) are employed to demonstrate that the presence of nanoscale CeO 2 significantly enhanced the diffusion of CO 2 during the adsorption process.
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Materials
·
2025
·Vol. 18
·期 9
·1988
·
IF 3.2
Yushi Qi,Fangming Wei,Yu Wang,Yu Jin,Xusheng Chang,Gang Chen
To enhance the mechanical properties of 6082 aluminum alloy, a novel Sc- and Zr-microalloyed 6082 alloy was fabricated through squeeze casting technology. Microalloying with Sc and Zr substantially refined the microstructure of alloy, achieving an average grain size of 136.36 μm—a 31.7% reduction compared to the baseline 6082 alloy. Furthermore, the addition of Sc and Zr effectively refined the coarse AlFeMnSi intermetallic phases, mitigating their inherent brittleness. The Sc/Zr-modified alloy exhibited delayed age-hardening kinetics, requiring 100% longer aging time to reach peak hardness due to Sc/Zr-induced retardation of β’’-phase precipitation. The optimized alloy demonstrated better mechanical properties, showing 10.4%, 8.0%, and 71.8% enhancements in yield strength, ultimate tensile strength, and elongation, respectively, over the non-microalloyed counterpart. The squeeze-cast Sc/Zr-modified alloy valve body showed yield strength exceeding 300 MPa and elongation above 10% across various sections, which verifies the effectiveness of this integrated microalloying and forming approach.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 12
·1-10
·
IF 2.8
Hao Yi,Ma Tianzhu,Yan Yangxi,Li Zhimin,Murakami Ri-ichi,Zhang Dongyan
Nickel-rich cobalt-free cathode materials have received widespread attention due to their advantages of high energy density, low-cost, and environmental friendliness. However, the instability of the structure and surface interface accelerates the capacity degradation of these materials during cycling. Here, we synthesized LiNi 0.9 Mn 0.1 O 2 (NM91) nickel-rich cobalt-free cathode material by sol–gel method and optimized it by Zr doping to enhance the electrochemical performance. Comprehensive structural characterization confirmed that Zr doping effectively suppressed the volume change and microcrack formation during the H2–H3 phase transition, reduced the side reactions occurring on the surface, and generated a thinner and more stable CEI layer, which effectively prevented the erosion of the electrolyte. As a result, Zr–NM exhibits superior cycling stability and rate performance. Notably, 0.75%Zr–NM shows excellent capacity retention of 92.36% at 1 C and achieves a discharge specific capacity of 138 mAh·g −1 even at a high current density of 10 C.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Fangfang Li,Xiaofang Hou,Wei Fu,Jinjin Wang,Ying-Hua Zhou
The efficient transformation of CO 2 into high-value chemicals remains a significant challenge, particularly in the design of heterocatalysts capable of simultaneous multi-site activation towards the substrate. In this work, we develop the novel Zr-MOF catalysts incorporating both cobalt(II) meso-tetra(4-carboxyphenyl)porphine (CoTCPP) complex and the imidazolium bromide-based ionic liquid (IL) containing different alkyl chain (RImBr), where R = Et, Pr, Bu, and Pe), denoted as CoTCPP-UiO-66-IL(RImBr). The catalysts were synthesized through a solvothermal method followed by a post-synthetic modification. Among the prepared catalysts, CoTCPP-UiO-66-IL(BuImBr) demonstrated exceptional performance on the solventless and cocatalyst-free conversion of epichlorohydrin into chloropropene carbonate, achieving a remarkable 99% yield under mild conditions (90 °C and 1.0 bar CO 2 ). This outstanding catalytic efficiency was attributed to the synergistic effects of the dual Lewis-acid active sites offered by Zr-MOF node and the integrated CoTCPP complex, the strong nucleophilicity resulting from the incorporated imidazolium bromide-type IL, and the improved CO 2 adsorption capacity. Additionally, the CoTCPP-UiO-66-IL(BuImBr) catalyst exhibited excellent recyclability and broad substrate versatility in epoxide cycloaddition. These findings provide valuable insights into the development of multifunctional MOF-based heterogeneous catalysts with high activity and sustainability for CO 2 conversion applications.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Shidong Song,Yongqiang Xu,Yanli Ruan,Hong Wang,Dequan Zhang,Joykumar Thokchom,Donghai Mei
Amorphous Li–La–Zr–O (LLZO) solid-state electrolyte thin films are promising alternatives to the well-established lithium phosphorus oxynitride (LiPON) electrolyte for all-solid-state lithium batteries due to their potentially higher Li-ion conductivity and stability. Herein, the enhancement methodology in the ionic conductivity of amorphous LLZO-based thin films is investigated. By doping with Ta, the conductivity of the amorphous LLZO film at 30 °C (3.9 × 10–7 S cm–1) can be enhanced by up to an order of magnitude (2.6 × 10–6 S cm–1), ascribed to tuning Li conduction in local near-order LLZO nanodomains. On that basis, an isomeric Li–La–Zr–Ta–O (LLZTO) amorphous–crystalline composite thin film is prepared via incorporating cubic LLZTO particles into the amorphous LLZTO matrix. The composite film with 10 wt % cubic LLZTO filler can further achieve an ionic conductivity of 0.8 × 10–5 S cm–1 at 30 °C, which is comparable to the best values obtained for the state-of-art LLZO-based thin films. Li transport through the well-connected cubic LLZTO filler network and along the interfaces between the crystallites and the amorphous matrix in the LLZTO composite thin film may offer fast and long-range Li-conduction pathways, which supplement the ionic conduction in the amorphous matrix with short-range-ordered and long-range-disordered structures.
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FUEL
·
2025
·
IF 7.5
Zhenzhen Wang,Shufeng Lin,Liujun Wang,Zhe Wang,Bing Lu,Zhonghua Sun,Zhihui Zhang,Mingyang He,Junfeng Qian
The hydrogenation of CO 2 to formic acid (FA) represents a sustainable route for carbon utilization and chemical production, yet it faces challenges in catalytic efficiency, selectivity, and process scalability. Herein, we report a highly efficient catalytic system based on Pd supported on amine-functionalized Zr-SBA-15 (Pd/Zr-SBA-15-AP) for continuous FA synthesis in a fixed-bed reactor. The flake-shaped Zr-SBA-15 support with short mesoporous channels facilitates superior mass transfer. Meanwhile, amine functionalization was identified to serve a dual function: significantly enhancing CO 2 adsorption capacity and modulating the electronic state of Pd to form electron-enriched sites conducive to H 2 activation. The optimized catalyst, 0.3Pd/Zr-SBA-15-AP 3.0 , achieved an exceptional turnover number (TON) of 160 and a turnover frequency (TOF) of 80 h −1 , outperforming the state-of-the-art catalyst under similar continuous-flow conditions. Furthermore, the catalyst demonstrated stable performance over 32 h of continuous operation, underscoring its practical potential. This work provides a scalable strategy for sustainable FA production, effectively bridging laboratory-scale research and industrial application.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 3
·1180-1188
·
IF 2.047
Ji Xinran,Zhou Ke,Zhao Ye,Sun Meiling,Dong Shijun,Zhang Hongbo,Cao Hechun,Zheng Hui,Wu Qiong,Zhang Yang
The regulation of magnetic and dielectric properties for yttrium iron garnet ferrites by ion doping is highly desirable in microwave devices. In this work, yttrium iron garnet ferrites co-doped with Pr-Zn-Zr atoms with the chemical formula Pr x Y 3-x Zn 0.1 Zr 0.1 Fe 4.8 O 12 (x = 0, 0.1, 0.15, and 0.2) were prepared. The dependence of the crystal structure, microstructure, magnetic, and dielectric properties of the obtained samples on the Pr doping concentration was investigated. The morphologies and crystal structure characterizations confirm that the Pr ion has effectively doped in the yttrium iron garnet ferrites and increased the lattice parameter and grain size. The magnetic characterization shows that the saturation magnetization also increases with the Pr concentration and obtains a maximum value of 27.68 emu/g at x = 0.15. Additionally, the doping of Pr increases the magnetic anisotropy constant K 1 which increases ferromagnetic resonance linewidth. Lastly, the dielectric properties measurement further indicates that Pr doping improves both real and imaginary parts of permittivity, and the highest value of the real part of the permittivity is obtained at x = 0.15. Consequently, the crystal structure, microstructure, magnetic properties, and dielectric properties of garnet ferrite can be effectively regulated by the Pr doping concentration, and excellent properties of the ceramic can be obtained at x = 0.15, which allows potential applications in microwave devices.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·A658
·
IF 3.12
Zhenya Wang,Limei Sun,Wenyun Yang,Jinbo Yang,Kai Sun,Dongfeng Chen,Xiangfeng Liu
Li4Ti5O12 (LTO) has attracted great interest as an anode material due to the "zero strain" during Li+ insertion and extraction. But the intrinsic ionic diffusion coefficient and electronic conductivity are very poor. Herein, a strategy of Mg2+ and Zr4+ co-doping has been proposed to modulate the crystal structure and improve the electrochemical performances. More importantly, the synergic roles of Mg/Zr co-doping has been unveiled based on the analysis of X-ray diffraction, Neutron powder diffraction, X-ray photoelectron spectroscopy, and electrochemical measurements. Firstly, Mg-Zr co-doping expands the lattice parameter, cell unit volume and even Li-O bond length, which reduces Li+ migration barrier and benefits to Li+ insertion/extraction. Secondly, Ti-O shrinkage induced by Mg-Zr co-doping enhances the structure stability and subsequently the cycle performance. Thirdly, Mg-Zr co-doping promotes more Ti4+/Ti3+ which facilitates electron conductivity. Moreover, Mg-Zr co-doping also decreases the polarization and charge transfer impedance. Li3.8Mg0.2Ti4.9Zr0.1O12 delivers a discharge capacity of 180.5, 150.7, 110.4 and 78.9 mAh/g at 0.2C, 1C, 5C and 10C, respectively. Moreover, the capacity retention is greatly increased from 57.9% of LTO to 98.59% at 10C after 500 cycles.
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