Inorganic Chemistry Frontiers
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2022
·Vol. 9
·期 21
·5663-5672
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IF 7.779
Qixuan Qin,Asu Li,Yizhuo Fan,Xindong Zhang
In this work, Au nanoparticle-loaded ZnO/ZnFe2O4 (Au-ZnO/ZnFe2O4) microspheres were prepared using a combination of a two-step hydrothermal process and a co-precipitation method. The SEM and TEM analyses showed that the synthesized Au-ZnO/ZnFe2O4 samples were microspheres with a yolk–shell structure assembled from nanosheets. Gas-sensitive performance tests indicated that Au-ZnO/ZnFe2O4 showed the highest response to 100 ppm acetone (18.18), higher than those of ZnFe2O4 (8.4) and ZnO/ZnFe2O4 (11.6). In addition, the optimum operating temperature of Au-ZnO/ZnFe2O4 decreased from 279 to 206 °C compared to ZnFe2O4 and ZnO/ZnFe2O4. In addition, Au-ZnO/ZnFe2O4 yolk–shell microspheres exhibited fast response and recovery times (4 and 23 s, respectively). The sensor has a lower limit of acetone detection (0.7 ppm) at 85% RH and is able to effectively differentiate diabetic patients from healthy subjects by detecting acetone in their exhaled breath. The enhanced response of Au-ZnO/ZnFe2O4-based sensor is attributed not only to its high specific surface area but also to the synergistic effect of the n–n heterojunction structure of ZnO-ZnFe2O4 and the catalysis of Au nanoparticles.
研究领域:
材料科学
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医学诊断
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 55
·34609-34617
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IF 3.108
Xiang Ma,Xinyuan Zhou,Yan Gong,Ning Han,Haidi Liu,Yunfa Chen
ZnO/ZnFe2O4 hollow cube composites with heterogeneous structure are synthesized by a facile strategy through simple and direct pyrolysis of FeIII-modified Zn-based metal–organic frameworks. The as-synthesized ZnO/ZnFe2O4 hollow cubes have well-defined cube morphology with an ∼2 μm and multiple porous shell constructed from interpenetrated ZnO and ZnFe2O4 heterogeneous nanoparticles, providing structurally combined mesoporous channels for facilitating the diffusion and surface reaction of gas molecules. In addition, a comparative sensing performance investigation between ZnO/ZnFe2O4 hollow cubes and singular ZnO demonstrates that, in contrast with ZnO, the ZnO/ZnFe2O4 hollow cubes show significantly enhanced chemical sensing sensitivity towards low-concentration acetone. Furthermore, the ZnO/ZnFe2O4 hollow cubes exhibit good reproducibility and selectivity towards gaseous acetone. The enhanced sensing performance of the MOF-derived ZnO/ZnFe2O4 hollow cubes is ascribed to the unique hierarchical structure with high specific surface area, abundant exposed active sites with surface-adsorbed oxygen species and heterojunctions formed at the interfaces between ZnO and ZnFe2O4.
研究领域:
材料科学
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传感器技术
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纳米科技
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产品关联
DOI
高影响因子
Catalysis Science & Technology
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2017
·Vol. 7
·期 11
·2236-2244
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IF 5.773
Huabin Chen,Wenxia Liu,Zhuozhuo Qin
The majority of current photocatalysts are generally excited under ultraviolet (UV) and visible light, while near-infrared (NIR) light accounting for nearly half of solar light has not been fully used. Herein, a ZnO/ZnFe2O4 nanocomposite with the ability to degrade an organic dye in the presence of H2O2 under NIR irradiation was prepared by a co-precipitation method followed by calcination at 800 °C. As revealed by optical absorption analysis, the ZnO/ZnFe2O4 nanocomposite exhibits significant optical absorption in the UV, visible and NIR light regions. Benefitting from this unique photo-absorption property and the generation of reactive ˙OH mainly by the reaction of photogenerated electrons with H2O2, the ZnO/ZnFe2O4 nanocomposite performs well in photodegrading methyl orange under either UV, visible or NIR irradiation. Moreover, the UV, visible and NIR photocatalytic activities of the ZnO/ZnFe2O4 nanocomposite did not change significantly after three runs of recycling. This finding opens a new approach for fully utilizing solar light energy, especially the energy of NIR light.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2018
·
IF 1.861
Xiaojuan Li,Bo Jin,Jingwen Huang,Qingchun Zhang,Rufang Peng,Shijin Chu
In this study, novel ternary Fe 2 O 3 /ZnO/ZnFe 2 O 4 (ZFO) composites were successfully prepared through a simple hydrothermal reaction with subsequent thermal treatment. The as-prepared products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis, Barrett-Joyner-Halenda (BJH) measurement, and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). The photocatalytic degradation of rhodamine B (Rh B) under visible light irradiation indicated that the ZFO composites calcined at 500 °C has the best photocatalytic activity (the photocatalytic degradation efficiency can reach up to 95.7% within 60 min) and can maintain a stable photocatalytic degradation efficiency for at least three cycles. In addition, the photocatalytic activity of ZFO composites toward dye decomposition follows the order cationic Rh B > anionic methyl orange. Finally, using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species during the degradation reaction of Rh B.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
·
IF 4.1
Xupeng Chen,Jun Yu,Yong Jin,Yunzhao Zhang,Jie He,Xingang Li,Chun Zhang
In this paper, C/ZnO/ZnFe 2 O 4 @ZnIn 2 S 4 ternary heterojunctions were prepared using Zn-Fe bimetal-organic frameworks (Zn-Fe MOFs) as precursors and applied to the photocatalytic degradation of tetracycline hydrochloride (TC). The experimental results show that 30 mg of the composite (FS-2) showed 96 % removal of 20 mg/L TC. The improved photocatalytic performance was attributed to the synergistic effect of the double S-scheme heterojunction and the carbon layer, which greatly facilitated the separation of electron-hole pairs by the reverse motion of electrons and holes driven by the difference of work functions and the built-in electric field at the interface. The carbon layer acts as an electronic bridge can further improve the charge transfer between the interfaces of different photocatalysts, allowing more useful electrons and holes with strong redox capabilities to participate in the surface reactions. Combining the experimental results and density functional theory (DFT) calculations, the photocatalytic mechanism of the dual S-scheme system is proposed. This study provides a theoretical basis for the design of novel photocatalytic materials with dual S-scheme heterojunctions and efficient photocatalytic degradation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Xiao Wang,Shouwei Zhang,Minghui Shao,Jinzhao Huang,Xiaolong Deng,Peiyu Hou,Xijin Xu
ZnO/ZnFe 2 O 4 hollow nanocages have been designed and synthesized through a metal organic frameworks route, which involves two steps including the synthesis of Fe(III)MOF-5 nanostructured cages precursors and the subsequent transformation to ZnO/ZnFe 2 O 4 hollow nanocages by thermal annealing in air. The ZnO/ZnFe 2 O 4 architecture is constructed by hollow nanocages with the scale around 100 nm. To demonstrate its functional properties, the as-prepared products are utilized as sensing material for gas sensor. Significantly, the ZnO/ZnFe 2 O 4 hollow nanocages exhibit enhanced response to acetone (25.8) with the detection limit of 1 ppm at an optimum temperature of 290 °C toward its two individual compositions (ZnO nanocages (7.9) and ZnFe 2 O 4 nanospheres (8.1)). Moreover, the response of the ZnO/ZnFe 2 O 4 nanocages is even larger than that of other architectures, which follows the order hollow nanocages > double shell > hollow microsphere > hybrid hollow sphere > nanoparticle with rod. The remarkable gas sensing performance enhancement of ZnO/ZnFe 2 O 4 nanocages can be attributed to the unique porous and hollow structure, heterojunction and high response/surface area ratio.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2017
·Vol. 6
·期 3
·1210-1218
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IF 8.867
Tingting Yang,Jiawei Xue,Hao Tan,Anjian Xie,Shikuo Li,Wensheng Yan,Yuhua Shen
Highly ordered heteronanostructures with binder-free interfaces are the key factors in developing high-performance photoanodes. Here, we design and fabricate three-dimensional ordered macroporous ZnO/ZnFe2O4 inverse opals with binder-free heterojunction interfaces that improve the separation of photogenerated charge carriers. The well-defined ZnO/ZnFe2O4 inverse opal displays a high photoconversion efficiency of 0.81% at 0.38 V versus the RHE without any co-catalyst assistance, which is over 6 times higher than that of the pristine ZnO sample (0.13% at 0.65 V vs. the RHE). Furthermore, the photoanode is quite stable even after 10 h of continuous illumination with a slight photocurrent decay of 4.9% (88.0% loss for the pristine ZnO). The high performances of the ZnO/ZnFe2O4 inverse opals can be attributed to the improved interfacial charge carrier separation based on electrochemical analysis and first-principles calculations. This work may provide more insights into the design of highly efficient photoanodes for photoelectrochemical applications.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Hui Mei,Shixiang Zhou,Mingyang Lu,Laifei Cheng
Tetrapod-like ZnO/ZnFe 2 O 4 heterostructure composites were designed and fabricated for ethanol detection. Sensitivity and selectivity of ZnO were significantly enhanced after coating with ZnFe 2 O 4 , as it formed heterostructure and special morphology. The tetrapod-like structure formed numerous three-dimensional hollow holes as channels for the gas diffusion in the inner and outer surfaces of materials simultaneously, providing large specific areas as “reaction field” for gas adsorption. Additionally, the heterojunction increased oxygen adsorption, resulting in the formation of more chemisorbed oxygen species for reaction with the target gas. Further, in contrast to aggregated structures, the ZnO/ZnFe 2 O 4 tetrapods were separated from each other, and the electrons conducting between the tetrapod-shape ZnO/ZnFe 2 O 4 had to pass through the modified surface sensing layer at the boundary; thus, the response of the heterojunction to target gas significantly affected the overall resistance. Consequently, ZnO/ZnFe 2 O 4 exhibited an excellent responses value of 28.11–500 ppm ethanol gas. The sensor exhibited good sensing repeatability and long-term stability, which maintained 93% of its original response after 30 days. The response time and selectivity to ethanol were also enhanced compared with the pristine T-ZnO. Therefore, the proposed strategy may facilitate the design and fabrication of binary transition metal oxide based heterostructure for ethanol vapor sensing.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Shuang Li,Yuchi Zhang,Le Han,Xianliang Li,Yan Xu
Hierarchical kiwifruit-like ZnO/ZnFe 2 O 4 heterostructures were prepared using Fe-doped Zn-based metal organic framework as a precursor combined with a subsequent thermolysis strategy. The hierarchical ZnO/ZnFe 2 O 4 composites featured well-organized nanosheet-like surface morphology assembled from interpenetrated ZnO and ZnFe 2 O 4 nanoparticles, facilitating the diffusion and surface reaction of specific gas molecules in gas sensing applications. As expected, a comparative study of triethylamine gas sensing performance between the kiwifruit-like ZnO/ZnFe 2 O 4 heterostructures and single-component ZnO proved that the former composites showed improved triethylamine gas sensitivity with R a /R g = 40.5 at an operating temperature of 200 °C. Specifically, the ZnO/ZnFe 2 O 4 heterostructure exhibited a fast response/recovery time of 32 s/41 s and excellent long-term stability of up to one month towards gaseous triethylamine. The enhanced trimethylamine gas sensing mechanism is ascribed to the intriguing kiwifruit-like hierarchical architecture of ZnO/ZnFe 2 O 4 heterojunction with ultrathin nanosheets on its surface and abundant accessible reactive sites interacting with the target gas molecules. This work offers new opportunities for rationally designing gas sensing materials by assembling the multi-component architectures.
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Shangwei Song,Aitang Zhang,Lin Chen,Qiang Jia,Congli Zhou,Jingquan Liu,Xiaoxia Wang
Carbon materials exhibit potential as lightweight microwave absorption (MA) absorber, however, the MA performance of them is strongly limited due to the single loss mode and unsatisfactory spatial topography. In this work, the novel porous ZnO/ZnFe 2 O 4 /C@PG composites are synthesized using metal organic framework (MOF) and micro-sized porous graphene (PG) network as precursors via a synchronous reflux strategy for sufficient MA performance . As multi-component composites, the component of ZnO/ZnFe 2 O 4 /C will provide excellent dielectric loss and certain magnetic loss, while the PG conductive network can create more electronic transmission paths and significant conductive loss. In addition, the unique porous structure increases the probability of multiple reflection and scattering, which contributes to the high MA ability of ZnO/ZnFe 2 O 4 /C@PG. The minimum reflection loss (RL) value of ZnO/ZnFe 2 O 4 /C@PG could reach −54.6 dB at frequency of 9.04 GHz with thickness of 2.7 mm，and the effective absorption bandwidth (RL ≤ −10 dB, EAB) covered as wide as 5.36 GHz. This result demonstrates that ZnO/ZnFe 2 O 4 /C@PG composites have promising potential as tunable, broadband and high-performance microwave absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yu Chen,Yiwen Zhong,Zenghui Diao,Diyun Chen,Lingjun Kong
This study addresses the challenge of eliminating persistent antibiotics like levofloxacin (LEV) from wastewater by developing a ZnO/ZnFe 2 O 4 heterojunction catalyst through a sol-gel method. The heterojunction synergistically combines ZnO and ZnFe 2 O 4 to reduce bandgap energy (1.89–1.99 eV) and enhance visible-light absorption. Under energy-efficient LED irradiation (5 W, 320–780 nm), the ZnO/ZnFe 2 O 4 -PMS system achieved 94.11% LEV degradation within 90 min, alongside 58.61% total organic carbon removal efficiency and 71.69% defluorination efficiency, outperforming individual components and physical mixtures. Mechanistic investigations revealed that reactive oxygen species ( 1 O 2 , SO 4 - ∙, ‧O 2 - and ‧OH) and holes jointly oxidize LEV. The heterojunction’s built-in electric field effectively suppressed charge recombination, as being confirmed by photoluminescence and photocurrent analyses. Remarkably, the catalyst retained >87% efficiency over four cycles with negligible metal leaching efficiency (<1%), demonstrating robust stability. This work highlights the dual advantages of the ZnO/ZnFe 2 O 4 heterojunction and LED-driven activation, offering a scalable and energy-efficient strategy for antibiotic wastewater remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yaqin Chen,Jiafeng Wu,Weisen Yang,Yuanyuan Fu,Rihui Zhou,Shouhui Chen,Lixue Zhang,Yonghai Song,Li Wang
Transition metal oxides@carbon(C) nanocomposites with hierarchical three-dimensional (3D) core-shell nanoarchitectures, large surface area and high electrical conductivity as anode materials for lithium ion batteries (LIBs) are very desirable. Herein, we developed a simple and feasible route to fabricate novel hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres with well-defined hollow microstructures via one-step carbonization of Zn/Fe-metal organic frameworks for the first time. The as-prepared hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres were carefully characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, thermogravimetric analysis , N 2 adsorption/desorption isotherm, transmission electron microscopy and electrochemical techniques . The results showed ultrafine ZnO and ZnFe 2 O 4 nanocrystals were uniformly encapsulated by few carbon layers which was derived from in-situ carbonization of the organic ligands. Benefiting from their special hollow nanoarchitectures, ultrafine ZnO and ZnFe 2 O 4 nanocrystals encapsulated by a few carbon layers, large specific surface area and high electrical conductivity, the hierarchical 3D ball-in-ball ZnO/ZnFe 2 O 4 @C nanospheres presented high reversible capacities of 1283 and 1100 mA h g −1 after first 100 cycles and the following 100 cycles at current density of 100 and 200 mA g −1 , respectively. A high specific capacity of 155 mA h g −1 was obtained at relatively large current rates of 20 A g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）