Catalysis Science & Technology
·
2024
·
IF 4.4
Peng Wang,Shaowen Hou,Pengxiang Tu,Bing Xue,Weixin Guan,Dong Wang,Danfeng Zhou,Yajun He,Xinhui Chen,Yixing Wang,Kegong Fang,Xiaonian Li,Jun Ni
As a sustainable, environmentally friendly, and economically viable way to produce 1,3-butadiene, the ethanol-to-butadiene (ETB) process has received increasing attention recently. This ETB process normally requires catalysts with suitable acidity and basicity, namely an acid–base balance. However, the origin of acid–base balance has not yet been elucidated. Herein, we demonstrate that by finely coordinating the interaction of ZnO and ZrO2, a butadiene productivity of 0.33 gBD gcat−1 h−1 at low WHSV and 1.39 gBD gcat−1 h−1 at high WHSV can be achieved. In contrast, pure ZnO prefers ethanol dehydrogenation to acetaldehyde and pure ZrO2 favors ethanol dehydration to ethylene and diethyl ether. Through a variety of characterization techniques, we found that the interaction of ZnO and ZrO2 alters the acidity and basicity of catalysts, resulting in volcanic shapes of ethanol conversion, butadiene selectivity, and butadiene yield in the ETB process. These findings provide in-depth insights into the understanding of the ETB process and may also apply to other reaction systems using ZnO–ZrO2 as catalytically active components.
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Yan Hongsheng,Xiong Jie,Du Peijian,Wu Ermiao,Pan Tiandi,Li Ni
The construction of semiconductor heterojunctions is an effective way to enhance the photocatalytic activity. In this work, n–p heterojunction composed of ZnO nanorods and polypyrrole (PPy) nanospheres were loaded on polyacrylonitrile (PAN) nanofibers to fabricate ZnO/PPy/PAN nanofiber membranes (ZnO/PPy/PAN NFMs) via electrospinning, hydrothermal synthesis and chemical polymerization. The results showed that the photodegradation rate of ZnO/PPy/PAN NFM was about 4.8 times higher than that of ZnO/PAN NFM. Moreover, the membrane exhibited good cycling stability, which maintained the removal efficiency of rhodamine (RhB) at 79% after five cycles. The enhanced photocatalytic activity was mainly ascribed to the synergistic effect of PAN nanofibers adsorption and n–p heterojunctions catalysis, resulting in a narrow bandgap, an increase in the absorption of visible light and the separation efficiency of electron–hole. Meanwhile, the degradation mechanism of ZnO/PPy/PAN NFMs was proposed. This work provides a promising strategy to construct n–p heterojunction photocatalysts for removing organic pollutants in wastewater.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Lijuan Wang,Yinghan Li,Jun Cai,Shuqing Liu,Zifan Yuan,Depeng Gao
A novel heterogeneous nanocomposite photocatalyst ZnO/g-C 3 N 4 was fabricated by secondary high-temperature calcination using g-C 3 N 4 and ZnO as raw materials and characterized by XRD , SEM , TEM, EDS , FT-IR, Zeta potential , UV-Vis and XPS . The results displayed that the ZnO/g-C 3 N 4 components were tightly bound, evenly distributed and significantly reduced in size, which could provide more active sites. The heterogeneous types, photocatalytic performance, degradation mechanism of ZnO/g-C 3 N 4 for dyeing wastewater were speculated by REDOX potential, heterojunction , and quenching experiments. The degradation efficiency of ZnO/g-C 3 N 4 on MB was much higher compared with that of single ZnO, g-C 3 N 4 and the mechanical mixture of ZnO and g-C 3 N 4 , which can reach more than 95% at 60 min. The degradation rate was also significantly improved, with the degradation rate exceeding 50% at 20 min. The composite ZnO/g-C 3 N 4 could degraded 90% MB after 5 cycles. The quenching experiment showed that hydroxyl (·OH) and photogenerated hole (h + ) played the main role in the reaction process. It was confirmed that the prepared ZnO/g-C 3 N 4 formed a Z-scheme photocatalytic system by examining the transfer paths of e - and h + in various types of heterojunction and contrasting the CB and VB energy levels with the REDOX potentials of ZnO and g-C 3 N 4 . The Z-Scheme ZnO/g-C 3 N 4 photocatalyst has the characteristics of stability, reusability, and no by-product, making it an ideal choice for environmental purification.
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Xinzhi Wang,Yurong He,Meijie Chen,Yanwei Hu
Direct absorption solar collector (DASC) is a promising technology for solar energy harvesting . Recently, nanofluids have shown great potential for DASC applications due to their tunable optical absorption properties . An advanced composite combining plasmonic gold nanoparticles (Au NPs) and hedgehog-like hierarchically structured ZnO particles (HPs) was prepared and used in DASCs. The nanofluid prepared with 1.0 mg mL −1 HP-Au exhibited excellent stability and broadband optical absorption properties, and reached an equilibrium temperature of ~125 °C within 1 h of solar heating at an irradiation power of 10 kW m −2 . A new photothermal conversion efficiency model was established to evaluate the solar harvesting performance of the HP-Au/oil nanofluid by simultaneously considering the effect of the working fluid temperature on the heating and cooling efficiencies. Compared to the base fluid, the HP-Au/oil nanofluid exhibits a 240% enhancement in photothermal conversion efficiency. The HP-Au/oil nanofluid shows great potential as a working fluid in direct absorption solar collectors.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Huili Wang,Luting Yan
The excellent adhesion property of polydopamine (PDA) provides a new way to fixing nanoparticles . This study investigated the effects of PDA/ZnO nanocomposite as an electron transport layer (ETL) material on the performance of polythieno[3,4-b]-thiophene/benzodithiophene:[6,6]-phenyl-C70-butyric acid methyl ester bulk heterojunction solar cell . On one hand, the strong adhesive property of PDA to ZnO nanoparticles is beneficial to the formation of a uniform ZnO thin film , which is favorable for electron transfer. On the other hand, an energy level mismatch exists between PDA and ZnO, which hinders electron transfer from ZnO to ITO . Upon optimization, filling factor and photoelectric conversion efficiency are improved by 23.2% and 13.8%, respectively, when the single ZnO layer is replaced by PDA/ZnO nanocomposite as the ETL. Open circuit voltage resulted in 9.8% enhancement from 0.61 V to 0.67 V. However, the short circuit current density is reduced.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xun Li,Hui Hu,Tian Tan,Mengjing Sun,Yuwen Bao,Zhongbing Huang,Sohail Muhammad,Xiaohong Xia,Yun Gao
Detection of leaks of flammable methane (CH4) gas in a timely manner can mitigate health, safety, and environmental risks. Zinc oxide (ZnO), a polar semiconductor with controllable surface defects, is a promising material for gas sensing. In this study, Ag–Ru co-doped into self-assembled ZnO nanorod arrays (ZnO NRs) was prepared by a one-step hydrothermal method. The Ag–Ru co-doped sample shows a good hydrophobic property as a result of its particular microstructure, which results in high humidity resistance. In addition, oxygen vacancy density significantly increased after Ag–Ru co-doping. Density functional theory (DFT) calculations revealed an exceptionally high charge density accumulated at the Ru sites and the formation of a localized strong electric field, which provides additional energy for the CH4 reaction with •O2– at the surface at room temperature. Optimized AgRu0.025–ZnO demonstrated an outstanding CH4 sensing performance, with a limit of detection (LOD) as low as 2.24 ppm under free-heat and free-light conditions. These findings suggest that introducing defects into the ZnO lattice, such as oxygen vacancies and localized ions, offers a promising approach to improving the gas sensing performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Linyun Zhang,Shanxin Li,Xuzhou Jiang,Hongying Yu,Yijing Sun
Carbonaceous materials have great prospects in microwave absorption due to their lightweight and corrosion resistance. However, their high conductivity leads to poor impedance matching, posing a significant challenge for obtaining outstanding microwave absorption (MA) materials from carbonaceous materials. In this work, the core-shell ZnO/C nanorods (ZCNs) are prepared by covering conductive carbon on the surface of ZnO nanorods through a simple stirring process in ambient temperature and calcination treatment. The thickness of carbon shell is carefully regulated to realize appropriate impedance matching and strong microwave dissipation capability. ZCN with 30.2 nm of carbon shell achieves outstanding microwave absorption in low frequency and broadband microwave absorption because of the synergies of optimized impedance matching and enhanced dielectric loss: the reflection loss of 49.9 dB at 6.32 GHz, and the effective absorption bandwidth of 6.4 GHz at a corresponding thickness of 2.0 mm. RCS simulation results have verified its excellent performance in practical application. This study proposes a simple and effective idea for the efficient utilization of carbonaceous materials in microwave absorption.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Xuehu He,Chunyan Chen,Yuheng Liu,Jiancai Le,Guoqing Xiao,Chunlin Chen,Yucheng Wang,Jian Zhou
Cactus-like ZnO@three-dimensional reduced graphene oxide aerogels (3D rGA) were obtained via a hydrothermal method. The 3D rGA had an interconnected large-size network structure, and cactus-like ZnO nanoparticles were uniformly distributed on the 3D rGA. The gas sensors based on cactus-like ZnO@3D rGA showed a high response (81.07) and a fast response/recovery time (15/27 s) to 10,000 ppm hydrogen at room temperature (25 ℃), as well as an excellent stability and selectivity toward hydrogen. The improved hydrogen sensing performance of this 3D structure was mainly related to the high conductivity and porous structure of reduced graphene oxide. Besides, the p-n heterojunction formed between ZnO and reduced graphene oxide was also a significant factor for the performance improvement. The results indicated that the cactus-like ZnO@3D rGA material was promising for the detection of hydrogen at room temperature.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 19
·1-15
·
IF 2.8
Suguna A.,Parthibavarman M.,Sridevi C.,Al-Mohaimeed A. M.,Al-onazi W. A.
New ternary nanocomposites for photocatalysis, composed of ZnFe 2 O 4 @ZnO@rGO, were synthesised in this work using a straightforward hydrothermal method. After characterising the samples' structures, morphologies, and photoelectric outcomes, researchers found that 25–30 nm ZnFe 2 O 4 @ZnO nanoparticles were securely attached to the surface of the rGO sheets' fibres. The photocatalytic activity in the deterioration of rhodamine B (RhB) was much enhanced by the ZnFe 2 O 4 @ZnO@rGO composite photocatalysts when compared to ZnO, ZnFe 2 O 4 , and ZnFe 2 O 4 @ZnO. With a degradation efficiency of 99.9% for RhB and 88.7% for MB after 60 min of ultraviolet (UV) radiation, the ZnFe 2 O 4 @ZnO@rGO composite photocatalyst stood out as the most active photocatalyst. In addition, this nanocomposite exhibited excellent adaptability for use in water treatment, since it could be magnetised apart and maintained a dye removal percentage of about 100% after eight cycles. Analysis of the photodynamic response and TRPL spectra further verified that the manufactured ternary composite had improved charge transfer efficiency. The synergy of multicomponent ternary nanocomposites may have contributed to the enhanced performance by increasing absorption capacities automatically, discouraging the reconsolidation of electron–hole couples, and inducing the photodeveloped separation of proteins.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Rong Fang,Hongwei Hu,Jiupai Ni,Chengsheng Ni
ZnO is a semiconductor with a reactive surface due to the presence of oxygen vacancies, but its application in solid oxide electrochemical cells (SOCs) was limited by its low electronic conductivity. Aluminum-doped zinc oxide (AZO), an n -type transparent conductive oxide, is explored for the reversible SOCs. Interestingly, 2 at. % of alumina doping in zinc oxide (AZO-2) increased the electric conductivity of ZnO to 1 Scm −1 at 800 °C. The K chem (5.98 x 10 −8 cm s −1 ) of AZO-2 from electric conductivity relaxation is 91% higher than that of ZnO. AZO-2 electrode on Y 0.16 Zr 0.84 O 1.92 (8YSZ) electrolyte exhibits a polarization resistance ( R p ) of 0.73 Ω cm 2 at open-circuit voltage and 800 °C, and the reaction is limited by the surface exchange of oxygen species. The surface exchange current density of AZO-2 cathode on Y 0.16 Zr 0.84 O 1.92 is 0.0736 A cm -2 at 800 °C. AZO-2 electrode can be activated after 20 cycles of switching bias, and the R p is further decreases to 0.26 Ω cm 2 . This study confirms that AZO with an enhanced electric conductivity can be used for the oxygen electrode of a reversible SOC due to the fast surface oxygen exchange over the defective surface with couple Zn 2+ and O 2− vacancies.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bo Wang,Ziyan Zhao,Zihao Pan,Xuejian Liu,Zhengren Huang,Yan Liu
The ZnO–Al 2 O 3 –B 2 O 3 –SiO 2 (ZABS) glass powder was designed and innovatively employed to join AlN ceramics. The crystallization, thermal expansion and wettability behavior of the ZABS glass and glass-ceramic were investigated. The results shows that Zn 3 B 2 O 6 , ZnSiO 4 and Zn 4 B 6 O 13 were precipitated after heat treatments at different temperature, respectively, resulting in a variation in the coefficient of thermal expansion (CTE) of the ZABS glass ceramic. Then guided by the wetting behavior on the AlN ceramic substrate, the joining of the AlN ceramics by ZABS glass at various temperatures and holding times were conducted. Notably, Zn 3 B 2 O 6 was identified to be the primary product in the joints bonded at temperature of 700–800 °C due to the crystallization within the glass and no discernible reaction was observed between the substrate and the interlayer, while ZnSiO 4 was observed at the periphery of Zn 3 B 2 O 6 after 750 °C. Moreover, the crystalline phase Zn 3 B 2 O 6 gradually grew with the temperature and holding time increasing as the glassy phase gradually diminished, resulting in a reduction of the strength and reliability of the joints. The optimal flexural strength of the joints was 156 ± 11MPa at 700 °C for 30min. The reason for the high strength can be attributed to the interactions between the glass precipitated crystalline phase interlocking each other and the glass phase tightly bonded with the crystalline phase.
✓ 已验证
产品关联
DOI
高影响因子
Micro and Nanostructures
·
2024
·
IF 2.7
Yanghai Gui,Shuaishuai Zhao,Kuan Tian,Jintao Wu,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Dongjie Guo,Canxiang Fang
N-methyl pyrrolidone (NMP) is an organic compound that is mainly used in chemical synthesis, the manufacture of anesthetics and pesticides, and the production of electronic materials, especially in the preparation of electrodes for lithium-ion batteries. However, their high volatility and toxicity pose potential risks to health and the environment. Therefore, the development of rapid, highly sensitive and low-cost NMP gas sensors is urgent. In this paper, ZnO nanorods were in situ grown on ceramic tubes via hydrothermal method and subsequently annealed at different temperatures. The gas sensing performance of ZnO nanorods after annealing at different temperatures was investigated. The results show that the ZnO nanorods annealed at 400 °C have more oxygen vacancies and excellent selectivity to NMP at 210 °C, with a response value of up to 67.33–100 ppm NMP, a response time of 25 s, and a low recovery time as low as 8 s. The sensors have potential applications for rapid monitoring of NMP and environmental health protection, providing a simple and feasible method for NMP detection.
✓ 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）