Journal of Materials Research and Technology-JMR&T
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2024
·
IF 6.2
Liye Xing,Yaqiang Dong,Xiao Li,Xingjie Jia,Ling Zhang,Aina He,Jiawei Li,Qikui Man,Baogen Shen
As the application scenarios of soft magnetic composites (SMCs) tend to be high frequency, reducing their high-frequency core loss ( P cv ) and improve the heat-sinking capability to avoiding thermal failure of electronic system are still greatly challenging. In present work, we successfully designed and prepared novel ZnO insulating layers on the surface of FeBSiPCNbCu nanocrystalline powders and discussed their growth processes. In addition, we investigated the effects of the ZnO insulating layers on the magnetic properties and heat-sinking capability of the FeBSiPCNbCu nanocrystalline magnetic powder cores (NMPCs) and explored the related mechanisms. The experimental results show that the hydrolysis of 1.75 wt% zinc acetate dihydrate under the coupling of 1 wt% polyvinylpyrrolidone forms uniform and thin ZnO insulating layers on the powders surface. The FeBSiPCNbCu@ZnO NMPCs annealed at 510 °C for 60 min exhibit excellent magnetic properties and superior heat-sinking capability with a low core loss of 698.4 mW/cm 3 (20 mT, 2 MHz), high DC bias permeability of 68.3% (100 Oe) and heat conductivity coefficient of 2.22 W/(m•K) as compared with those of 859.8 mW/cm 3 , 57.1% and 1.86 W/(m•K), respectively, for the NMPCs without ZnO insulating layer.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yuhui Liu,Alei Dang,Xin Liu,Yanying Han,Jiahe Chen,Amir Zada,Yiting Sun,Zeqi Yuan,Fa Luo,Tiehu Li,Tingkai Zhao
The main contribution of semiconductor nanomaterials to surface-enhanced Raman scattering (SERS) comes from charge transfer (CT) between the absorbing molecules and the semiconductor. However, it is still challenging to realize the combined effects of the electromagnetic mechanism (EM) and the chemical mechanism (CM) for semiconductor-based SERS substrates. Herein, we demonstrate and design double-shelled ZnO (ZnO-DS) hollow microspheres by a modified hydrothermal/solvothermal process. SERS experiments and theoretical simulations proved that the excellent SERS activity is mainly attributed to the combined effect of Mie resonances generated by the nanocavities in the unique hollow double-shell nanoparticles and the CT effect excited by special structure ZnO. Particularly, the produced ZnO-DS SERS substrates exhibited a low limit of detection (LOD, 1 × 10–7 M for 4-MPY), outstanding sensitivity (EF = 1.2 × 104), and high stability (RSD = 10.4%, over 30 days of storage at room temperature). Furthermore, benefiting from the matching of energy levels of the ZnO-DS substrate and probe molecules, the sulfhydryl molecules with similar structures could be selectively distinguished in complex environments. We visualize that this work will resolve the current dilemma between sensitivity and selective detection of SERS substrates and expect to enable the monitoring of target molecules in the environment containing complex mixtures such as food safety and environmental protection.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
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IF 20.2
Yongjian Wei,Ying Li,Yunfei Xu,Yuze Zu,Yinghui Sun,Tong Xu,Haiou Liang,Jie Bai
Exploring the impact of metal oxide crystal facets on the cycloaddition reaction of CO 2 with epoxides is meaningful because pure metal oxides exposing specific crystal facets show considerable promise as catalysts for industrial applications. In this study, we developed a simple strategy to prepare single-crystal ZnO nanosheet materials with controllable crystal facets through hydrothermal synthesis, followed by pyrolysis under different atmospheres. Studies revealed that the formation of ZnO single-crystal nanosheets involves the decomposition of the precursors and an ordered phase transition. Based on the quantitative correlation between oxygen vacancies, surface Zn, and the catalytic activity of ZnO (002) with varying numbers of oxygen vacancies, together with TPD, Py-IR, in-situ EPR, fluorescence spectroscopy characterizations, and DFT calculations, a synergistic mechanism between oxygen vacancies and surface Zn was proposed. Specifically, oxygen vacancies are the active sites for CO 2 , whereas saturated coordination surface Zn atoms activate epoxides. At 125 °C, 2 MPa, and 4 h, 93.3 % yield of the product was achieved using only 5 mg of the optimal ZnO catalyst. The excellent performance, stability, and applicability of single-crystal nanosheets make them ideal candidates for industrial applications. This study provides a new insight into the catalytic mechanisms of CO 2 cycloaddition over metal oxides.
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JOURNAL OF SOLID STATE CHEMISTRY
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2025
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IF 3.5
Lanlan Zhang,Qi Wang,Yuanhu Lei,Xixi Yin,Bing Lv,Qingping Dai,Yangfang Liao,Xiaolu Wang
This study fabricated a type-II heterojunction photoanode system via a two-step synthesis strategy, constructing ZnO/CeO 2 nanotube arrays (NTAs) heterostructures by using zinc oxide NTAs as the substrate with surface-loaded cerium dioxide quantum dots (QDs). Firstly, one-dimensional ZnO nanorod arrays (NRAs) structures were prepared via electrochemical deposition, followed by etching in an alkaline solution to fabricate ZnO NTAs. Subsequently, CeO 2 QDs were synthesized using a precipitation method and loaded onto the surface of ZnO NTAs through spin-coating, successfully fabricating ZnO/CeO 2 heterostructures. The ZnO/CeO 2 heterojunction exhibits a photocurrent density of 35 μA cm −2 in neutral electrolyte under zero bias,1.75 times that of pristine ZnO NTAs. Its hydrogen evolution rate increases from 9.9 μmol h −1 cm −2 to 12.8 μmol h −1 cm −2 , demonstrating enhanced photoelectrochemical performance. The enhancement mechanism of photoelectrochemical performance was analyzed through Mott-Schottky ((MS) measurements, X-ray photoelectron spectroscopy (XPS), and bandgap characterization. Theoretical simulations, including finite-difference time-domain (FDTD) and first-principles calculations, were employed to model surface electric field variations and photoexcited carrier transfer pathways, further elucidating the charge transfer mechanism within the heterostructure. The improved photoelectronic properties and hydrogen evolution performance were attributed to the synergistic effects between ZnO and CeO 2 QDs, including enhanced light absorption capacity, increased exposure of surface active sites, and efficient separation of photogenerated carriers driven by the type-II band alignment of the two semiconductors.
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JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
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2024
·Vol. 30
·期 4
·1039-1051
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IF 3.8
Yujie Yang,Xiaodong Qiao,Xinpeng Fan,Shuangquan Liao,Zhenfan Sun
Zinc oxide (ZnO) is widely used as an activator in the vulcanization process of natural rubber. However, due to its poor compatibility with natural rubber, a large amount of ZnO needs to use, and the unreacted ZnO can precipitate in various ways, posing significant harm to aquatic organisms and microorganisms. Therefore, it is necessary to reduce the dosage of ZnO in order to minimize its environmental impact. In this study, we applied ZIF-8, a zinc-based metal–organic framework, as a vulcanization additive in natural rubber. and it was found that ZIF-8 could promote the rubber vulcanization reaction by adsorbing sulfur, promoting sulfur ring-opening, and providing different ligand interactions of Zn 2+ . Moreover, even at low usage levels of ZIF-8, it effectively reduces the amount of ZnO while simultaneously improving the mechanical properties of the samples. This work provides an effective method to reduce the amount of ZnO without sacrificing the rubber properties and provides a new idea for the application of ZIF-8 in rubber materials. Highlights ZIF-8 enhances properties of natural rubber composites with low ZnO dosages. Revealing the reason why ZIF-8 promotes the vulcanization of natural rubber. Investigation of the effect of ZIF-8 on the vulcanization properties of natural rubber.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6269
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IF 3.1
Mirza Nadeem Ahmad,Muhammad Naveed Anjum,Muhammad Fayyaz Farid,Atta-ul Haq,Akbar Ali,Muhammad Fayyazur Rehman,Mohammed A. Assiri,Muhammad Safwan Akram
Water pollution is growing at an alarming rate, particularly due to the colored wastewater released by the various industries into aquifers and fresh water sources, and in some extreme cases, they have reached the water table. Faisalabad, a city in Pakistan where there is an industrial cluster of textiles dyeing and manufacturers, water table has become undrinkable. The presence of hazardous dyes and chemicals imposes serious health issues on humans, animals, and plants. The treatment of such toxic dye effluents is crucial and could be done by efficient degradation methods such as photocatalysis. The current study presents synthesis of poly( o -methylaniline)/zinc oxide/reduced graphene oxide nanocomposite (POMA/ZnO/rGO NC) using a chemical oxidative polymerization process and explores its properties as a photocatalyst by demonstrating degradation of three dyes. The composite was characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), photoluminescence emission spectroscopy (PL), Brunauer Emmett–Teller analysis (BET), and UV–visible spectroscopy (UV–visible). Further, the photocatalytic activity of POMA/ZnO/rGO NC was evaluated and compared by degrading the direct yellow 12 (DY 12), congo red (CR), and malachite green (MG) dyes in aqueous media under UV irradiation. The results indicated that after 110 min, POMA/ZnO/rGO composite degraded the dyes by 92% (DY 12), 86.1% (CR), and 82.1% (MG), respectively. Moreover, kinetic studies of the photocatalyst were also performed along with reusability test, total organic carbon, chemical oxygen demand, and degradation mechanism.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Zhiru Wang,Meng Su,Chanjuan Wang,Yuxin Wang,Ying Liu,Xiaoshuang Yin,Wenzhong Yang,Hui Xu
A robust composite hydrogel (i.e., ZnO@(CNC- g -PAA/PEI)) integrating cellulose nanocrystal-grafted polyacrylic acid/polyethyleneimine with uniformly dispersed ZnO nanoparticles (NPs) was synthesized through dual chemical-physical cross-linking strategies. This multifunctional hydrogel synergistically combines adsorption and photocatalytic reduction for efficient Cr(VI) removal, exhibiting exceptional stability, recyclability, and performance. Systematic optimization revealed that pH, ZnO loading, adsorbent dosage, and contact time critically influenced removal efficiency. Under optimal conditions (pH at 3, 15 wt% ZnO loading, 100 mg/L Cr(VI), 0.5 g/L adsorbent), a remarkable 99.03 % Cr(VI) removal was achieved. The enhanced efficacy arises from three synergistic features: (1) a 3D porous architecture enabling rapid Cr(VI) diffusion, (2) abundant protonated amine groups for electrostatic adsorption, and (3) homogeneously distributed ZnO NPs minimizing aggregation and maximizing photocatalytic activity. Simulated light irradiation triggered Cr(VI)-to-Cr(III) reduction, regenerating active sites and amplifying removal capacity. Kinetic analyses confirmed pseudo-second-order adsorption. The hydrogel retained 94.75 % efficiency after five cycles, demonstrating robust reusability. This work provides a scalable strategy for designing hydrogel-based adsorbent-photocatalyst hybrids, offering a sustainable solution for chromium-laden wastewater remediation.
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ACS Catalysis
·
2025
·
IF 13.1
Cuizhu Ye,Yan Liu,Weiming Chen,Yu Mao,Yongfang Zhou,Geoffrey I. N. Waterhouse,Ziyun Wang,Yi Shen
Fe–N–C catalysts have emerged as promising alternatives to platinum-based electrocatalysts for the oxygen reduction reaction (ORR). However, single Fe–N4 moieties generally suffer from unsatisfactory intrinsic activity and durability. Herein, iron–copper oxide nanoparticles (FeCuxO NPs) were transformed into trimetallic atomic electrocatalysts containing atomically dispersed iron, copper, and zinc on N-doped carbons (FeZnCux-NC) via an in situ encapsulation and ZnO-mediated pyrolysis strategy. The introduction of Zn and Cu atoms modulates the electronic environment of traditional FeN4 sites, optimizing the adsorption and desorption of reaction intermediates and lowering the theoretical overpotentials of ORR. Benefiting from the unique configuration of dual-atom FeZnN6 sites and nearby CuN4 sites, a compositionally optimized FeZnCu0.05-NC electrocatalyst delivered a half-wave potential of 0.92 V in 0.1 M KOH electrolyte, outperforming a commercial Pt/C catalyst and most state-of-the-art ORR electrocatalysts. A zinc-air battery constructed with FeZnCu0.05-NC as the air-cathode catalyst delivered a specific capacity of 806 mAh g–1 and charge–discharge stability over 1500 h. This work offers a simple strategy for synthesizing polymetallic atom electrocatalysts with high ORR activity and excellent durability.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Wenyu Li,Hui Yu,Ming Yang,Xiangting Dong,Ying Yang,Tianqi Wang
Photosensitized metal oxide gas sensors have been a research hotspot in the field of gas sensors in recent years, the vast majority of related studies use the ultraviolet light as the excitation light source, there are relatively few related studies on the ceramic gas sensors using a single LED as the excitation light sources, and even fewer studies on using natural sunlight as the light excitation source. In this study, porous ZnO precursor particles were introduced into the channels of ZIF-8 to ensure the integrity of its skeleton after calcination, and ZnO/ZIF-8 derivative was prepared and used to construct gas sensors to detect NO x under the different excitation light source (the natural sunlight, 365 nm LED and xenon lamp). Compared with the test under darkness conditions, the operating temperature was reduced 70℃ under light excitation conditions, the gas-sensitive response of the gas sensor to 20 ppm NO x under the natural sunlight excitation was 7.48 times of the darkness conditions, and the measured detection limit was as low as 50 ppb. Under the excitation of natural sunlight, 365 nm LED or xenon lamp, the room temperature gas sensitive response to NO x gas could be achieved. The prepared gas sensor was used for the actual detection of NO x concentration in vehicle exhaust, which showed the attractive practicality and excellent detection sensitivity.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Jun-Tao Cao,Xiao-Jing Liao,Yu-Ling Wang,Yan-Ming Liu
A novel photoelectrochemical (PEC) aptasensor for lead ion (Pb 2+ ) detection was proposed on the basis of the CdSe quantum dots (QDs) co-sensitized ZnO-CdS nanostructure and the specificity of aptamer. The CdSe QDs-capped cDNA, as a signal enhancement element, could hybridize with the aptamer on the sensing platform to generate a CdSe/CdS/ZnO dual co-sensitized structure, realizing a great enhancement in photocurrent response. In the presence of Pb 2+ , the aptamer on the sensing interface specifically bound with the Pb 2+ to form G-quadruplex structures, which greatly inhibit the hybridization between aptamer and CdSe QDs-cDNA, leading to a decrement of the photocurrent signal. As the concentration of Pb 2+ increased, the photocurrent response showed a diminishing tendency. Under the optimized conditions, the fabricated PEC aptasensor exhibited a linear response between photocurrent variation and the logarithm of Pb 2+ concentration in the scope of 1.0 × 10 −9 M to 1.0 × 10 −5 M with a detection limit of 3.4 × 10 −10 M. Moreover, the aptasensor has been applied in the determination of Pb 2+ in environmental water samples with the good selectivity .
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 26
·51205-51213
·
IF 5.6
Chao Fan,Zijiang Yang,YiMing Yao,Cheng Tao,Rui Huang,Hua Hao,Zhonghua Yao,Hanxing Liu,Minghe Cao
The ternary transition metal oxide 40FeO-40NiO-20ZnO ((FNZ)O) was coated on the surface of BaTiO 3 (BT) powder to prepare (FNZ)O@ BT ceramics powder with uniform core-shell structure. The (FNZ)O coating effectively inhibits grain growth during the sintering process, reducing the grain size from 30 μm in pure BT ceramics to an ultra-fine grain size of 197 nm with uniform grain distribution. XRD analysis showed that the crystal structure of the ceramics gradually changed from tetragonal phase to cubic phase with the increase of the (FNZ)O. Under the electric field of 225 kV/cm, the highest discharge energy density (W d ) of 1 wt%(FNZ)O@ BT ceramic is 1.49 J/cm 3 , and the energy storage efficiency(η) is 71.3 %. The dielectric properties of (FNZ)O@ BT ceramics meet the X7R standard, it shows good temperature stability. In addition, 1 wt%(FNZ)O@BT ceramics also have very good high cycle stability (up to 10 5 cycles) and fast charge and discharge characteristics (τ 0.9 <0.75 μs). In this study, the core-shell structure prepared by coating ternary transition metal oxides opens up a way for the preparation of new functional materials.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Zhixuan Tan,Bin Liang,Jiaping Yang,Kepan Yan,Jiarong Chen,Xiaoying Liu,Xu Peng,Tangchao Xie,Yijuan Li
Zinc metal is one of the most promising anode materials for aqueous batteries. However, nonuniform deposition of zinc metal anodes and hydrogen evolution reactions (HER) severely affect the stability of aqueous zinc–ion batteries. Herein, a simple redox reaction between zinc metal and graphene oxide and a subsequent one-step replacement reaction were utilized to in situ fabricate rod-shaped zinc oxide, reduced graphene oxide (rGO), and Cu nanoparticles on the zinc anode surface. This ingenious design constructs an artificial gradient zinc-affinity interface layer (ZnO–rGO–Cu), which regulates the longitudinal electric field distribution, enabling Zn2+ to deposit uniformly along the gradient from bottom to top, thereby suppressing the dendrites growth. Besides, Cu nanoparticles and rGO partially isolate the zinc from the electrolyte to inhibit the unwanted HER. Moreover, these components reduce the interface contact angle with aqueous electrolytes, enhancing electrolyte affinity and electrochemical activity. Consequently, the Zn–rGO–Cu symmetric cells cycle stably for 1000 h at 1 mA cm–2, and the half-cells achieve 1500 stable cycles at 2 mA cm–2 with a high Coulombic efficiency of 99%. Furthermore, full cells paired with manganese-based and vanadium-based cathodes stably cycle 900 times at 0.5 A g–1 and 600 times at 2 A g–1, respectively. This study thus provides insights into rationally designing multifunctional interphase layers for high-performance zinc–ion batteries.
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