APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Fei Xue,Jihui Wang,Yutong Hou,Wenbin Hu
ZnO resistive switching films were prepared on the surface of SS304 using hydrothermal method combined with heat treatment. The surface and cross-sectional morphology, composition, oxygen vacancy content and semiconductor type of ZnO films were characterized. The corrosion resistance and resistance switching properties of ZnO films were determined by electrochemical methods. The oxygen vacancy formation energy, surface adsorption energy and diffusion barrier of ZnO system were calculated using first-principles. The results show that the samples with 0.5 mol/L Zn 2+ and 4 mol/L NaOH have the best performance, and its corrosion resistance efficiency can reach more than 99.5 %. Calculations show that the ZnO film containing oxygen vacancies still prevents the entry of Cl − , and applied electric field promotes the formation of oxygen vacancies and conductive filaments. Thus, polarization-immersion treatment can adjust the oxygen vacancy content in film, which enables film to switch between high and low resistance states, realizing the cyclic resistance-switching performance of film and greatly extending service life.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Shubin Cheng,Qian Lei,Coner Deng,Weixin Lei,Honglin Chen
A green protocol for refining industrial chemicals containing formaldehyde (FA) impurities is presented here for the first time. FA, as an unreactant or a byproduct, causes separation problems in many industrial processes. It can be removed to a level of less than 1 ppm with easily separable methanol formation using commercial Cu/ZnO/Al 2 O 3 catalyst at atmospheric pressure in the absence of external hydrogen. The formation of methanol is achieved by the transfer of hydrogen species generated with the assistance of water to free FA, affording high methanol selectivity (62 %). By investigating potential intermediates and implementing deuterium labeling experiments, together with carbon and hydrogen balance calculations, a plausible pathway of water-assisted FA removal is proposed. Moreover, the in situ generated hydrogen species can be transferred directly into unsaturated compounds for selective reduction.
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RARE METALS
·
2023
·Vol. 42
·期 9
·3075-3087
·
IF 8.8
Wu Si-Wei,Jiang Quan-Tong,Yuan Shuai,Zhao Qing-Kun,Liu Chang,Tang Heng,Sun Qiang,Duan Ji-Zhou,Hou Bao-Rong
Abstract Designing and fabricating the marine anti-corrosion materials without fluorine by superhydrophobic method is a huge challenge. In this study, an environmentally friendly composite coating was prepared by combing modified expanded graphite (EAG) with nano zinc oxide (ZnO). This coating showed superhydrophobic surface and good corrosion resistance. Fourier transform infrared spectroscopy (FITR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the materials in fabricating process of the coating. The properties of three composite coatings (ZnO, EAG, and EAG@ZnO) were analyzed, including surface roughness, water contact angle, corrosion resistance, self-cleaning and anti-fouling. The combination of ZnO and EAG caused a big water contact angle, leading superhydrophobic surface of the composite coatings. The electrochemical results showed that the superhydrophobic EAG@ZnO coating had a larger capacitive arc diameter and charge transfer resistance, indicating the enhanced anti-corrosion resistance. Meanwhile, the EAG@ZnO coating also showed good self-cleaning and anti-fouling performance according to solid and liquid pollutants tests. In addition, the mechanical properties and stability of the superhydrophobic EAG@ZnO coatings were evaluated by knife peeling and finger scratch tests. In summary, these superhydrophobic and anti-fouling EAG@ZnO composite coatings provide a potential application in marine corrosion and protection field. Graphical Abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Zhanwei Chen,Chen Wu,Wenrui Li,Shaowei Yang,Haidong Shen,Runze Gao,Tianshuai Wang,Qiuyu Zhang,Hepeng Zhang
The strength and micro-distance of acidic and basic sites on acid-base pair catalysts (ABPC) are crucial in determining their synergistic effect and catalytic capacity, yet challenging in the synthesis of effective ABPC due to the tunable difficulties. Here, a Co-ZnO ABPC, containing adjacent Co single atoms-ZnO nanocluster acid-base pairs, was prepared by pyrolyzing ZnCo ZIF-precursor under vacuum. Benefiting from the unique acid-base pair features, Co-ZnO ABPC exhibited outstanding performance for the catalytic hydrogen transfer (CHT) cascade reaction, achieving high nitrobenzene conversion (95 %) and imine selectivity (98 %) at 160 ℃ for 3 h, exceeded almost all the documented catalysts. Both the experimental and calculation results verified the stronger acidity of Co SAs and the synergistic effect of acid-base sites lowered the free energy barrier. This work provides not only prospective insight into the effect of acid-base sites on the catalytic capacity but also a guide for the rational design of efficient ABPC.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Xiaojing Cui,Yequn Liu,Wenjun Yan,Yanfeng Xue,Yangang Mei,Jiamei Li,Xiaoqing Gao,He Zhang,Shanhui Zhu,Yulan Niu,Tiansheng Deng
Suppressing reverse water-gas-shift (RWGS) reaction is high desirable but challenging and underdeveloped for Cu/ZnO catalysts, particularly for commercial Cu/ZnO/Al 2 O 3 catalysts. Different from the current methodologies to reduce RWGS reaction, we report a simply surface silylation method for efficiently minimizing RWGS reaction over a commercial Cu/ZnO/Al 2 O 3 catalyst. This method suppresses STY CO (Space-time yield) from 97.4 to 0.7 g CO ·kg cat −1 ·h −1 , improving STY MeOH from 20.2 to 39.9 g MeOH ·kg cat −1 ·h −1 and methanol selectivity from 15.1 to 92.9 mol%. The combination of characterization methods and density functional theory calculations provide insight into the suppressing mechanism of surface silylation on catalyst. A hydroxyl (on ZnO)-promoted RWGS reaction cycle is discovered, which can be efficiently inhibited by the consuming of hydroxyls via surface silyation. Our results provide a way to regulate RWGS reaction on Cu/ZnO-based catalysts and are expected to the further use of silylation strategy to tune the interconversion of CO and CO 2 via RWGS/WGS reaction on hydrogenation catalysts.
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Nanomaterials
·
2023
·Vol. 13
·期 16
·2370
·
IF 5.3
Ke Huang,Junfeng Lu,Donglin Li,Xianjia Chen,Dingfeng Jin,Hongxiao Jin
To improve the gas sensitivity of reduced oxide graphene (rGO)-based NO2room-temperature sensors, different contents (0–3 wt%) of rGO, ZnO rods, and noble metal nanoparticles (Au or Ag NPs) were synthesized to construct ternary hybrids that combine the advantages of each component. The prepared ZnO rods had a diameter of around 200 nm and a length of about 2 μm. Au or Ag NPs with diameters of 20–30 nm were loaded on the ZnO-rod/rGO hybrid. It was found that rGO simply connects the monodispersed ZnO rods and does not change the morphology of ZnO rods. In addition, the rod-like ZnO prevents rGO stacking and makes nanocomposite-based ZnO/rGO achieve a porous structure, which facilitates the diffusion of gas molecules. The sensors’ gas-sensing properties for NO2were evaluated. The results reveal that Ag@ZnO rods-2% rGO and Au@ZnO rods-2% rGO perform better in low concentrations of NO2gas, with greater response and shorter recovery time at the ambient temperature. The response and recovery times with 15 ppm NO2were 132 s, 139 s and 108 s, 120 s, and the sensitivity values were 2.26 and 2.87, respectively. The synergistic impact of ZnO and Au (Ag) doping was proposed to explain the improved gas sensing. The p-n junction formed on the ZnO and rGO interface and the catalytic effects of Au (Ag) NPs are the main reasons for the enhanced sensitivity of Au (Ag)@ZnO rods-2% rGO.Keywords:Au nanoparticles;Ag nanoparticles;rGO;ZnO rods;p-n junction;synergistic effect
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 12
·7853-7864
·
IF 5.7
Song Baiqing,Zhang Tianyi,Yang Kaili,Tian Guangming,Dang Yunzhi,Ma Jianhua
To realize the biocompatibility, mechanical strength, and sustained antibacterial properties of medical materials, it is feasible to introduce antibacterial material components into biomass matrix to prepare medical materials. Herein, zinc oxide (ZnO) was in-situ synthesized in bacterial cellulose (BC) dispersion and filtered into a film, and the BC/ZnO composite film was further immersed in sodium alginate (Alg) solution to construct the second layer structure. The microstructure, mechanical strength, and antibacterial properties of the composite films were investigated systematically. The tensile strength of the BC/ZnO/CAlg sample was achieved at 16.5 ± 2.4 MPa, much higher than that of the Zn 2+ crosslinked CAlg film of 11.5 ± 1.2 MPa. The Zn 2+ cross-linked Alg in the outer layer and the BC/ZnO composite film in the inner layer combined to create a synergistic effect. This secondary structure design ensures good hydrophilicity and hygroscopicity of the material which enables the sustained-release migration of Zn 2+ from the inner layer to the outer layer. Finally, the BC/ZnO/CAlg composite film possesses excellent antibacterial performance against Staphylococcus aureus and Escherichia coli. In addition, this work systematically expounds on the antibacterial and slow-release mechanism of secondary structure composite membranes. The results will provide a database and theoretical reference for applying BC/ZnO/CAlg composite membranes in the medical field.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bin Zeng,Xutao Ning,Linfang Li
Herein, a novel zinc oxide (ZnO) hexagonal cap with exposed polar facets/MXene composite was synthesized via a simple hydrothermal method . The analysis of the morphology and structure of these composites as well as the results of photochemical property measurements showed that a heterojunction was formed between ZnO and MXene . After testing the photocatalytic degradation of methyl orange, the ZnO hexagonal cap with 3 mL MXene showed the highest photodegradation efficiency of 87.8 % within 60 min under a xenon lamp. Active species capture experiments showed that •OH and h + species were the main contributors to the degradation of methyl orange (MO). We proposed a possible mechanism for the excellent photocatalytic activity of ZnO hexagonal cap@Ti 3 C 2 MXene. The Schottky barrier hindering the photogenerated electron recombination, the hexagonal cap morphology with highly active exposed facets, and the hollow structure favoring the adsorption of contaminants were all beneficial to achieve a high catalytic activity. This work provides new insight into the design of metal oxide/MXene photocatalysts .
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Hailin Pan,Jie Wang,Zhi Chen,Ziqi Su,Zheng Tang,Zaifei Ma
Developing transparent conductors to replace indium tin oxide (ITO) is a critical objective in the field of organic optoelectronics. Non-atomically doped (NAD) ZnO thin films, while currently exhibiting limited conductivity, are highly promising candidates due to their unique advantages, such as having complete transparency in both the visible and near-infrared spectral regions, solution processability, and the desired surface electronic properties. In this work, the impact of surface modification by insulating polymers on the ultraviolet-enhanced conductivity of NAD-ZnO films is investigated. It was found that polymer modifiers that are rich in amino and hydroxyl groups are effective at increasing the concentration of oxygen vacancies and the conductivity of NAD-ZnO films. The highest conductivity of over 1000 S cm–1, which is more than twice as high as the previous record for NAD-ZnO films, is achieved using polyethylenimine ethoxylated (PEIE) to modify NAD-ZnO films. Subsequently, the replacement of ITO in organic photovoltaic devices by a ZnO/PEIE electrode is realized. The ZnO/PEIE-based OPV devices that were created exhibit performances comparable to those of ITO-based devices under simulated solar illumination and performances better than those achieved with ITO-based devices under simulated indoor illumination. These results make NAD-ZnO a promising candidate for the widespread replacement of ITO in optoelectronic devices.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Taoning Lei,Qi Dang,Tong Wu,Yun Wu,Jingyi Yu
Electrochemical reduction of CO 2 enables a flexible and efficient way of converting CO 2 into diverse products. Cu 2 O is regarded as a crucial species for electrocatalytically transforming CO 2 to methanol while facing challenges such as the deactivation of the catalyst and low selectivity of desired products. Therefore, the modification of Cu 2 O and the improvement of its catalytic activity needs to be addressed. Herein, we reported a novel synthesis of Cu 2 O nanocubes (Cu 2 O-cube) using the wet chemical method and demonstrated a Faradaic efficiency of 29.1 % for methanol. We found Cu 2 O (100) facet was responsible and beneficial to improve methanol production . The performance degradation at different potentials due to the deactivation of Cu 2 O-cube were revealed from the changes of surface morphologies by scanning electron microscope (SEM). The electrocatalytic activity of Cu 2 O-cube was further enhanced by embedding Cu 2 O-cube into ZnO nanowires (ZnO@Cu 2 O-cube) through drop-drying, leading to a Faradaic efficiency of 38.9 % towards methanol at − 0.45 V vs. RHE. For parallel comparison, an alternative binding form of ZnO and Cu 2 O was investigated through stacking Cu 2 O film onto ZnO nanowires (ZnO@Cu 2 O-film) through electrodeposition . The results elucidated that the existence of ZnO tended to suppress the production of ethanol and the binding site of ZnO-Cu 2 O could improve the selectivity of methanol.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yuzhe Liu,Chunlian Quan
This research paper introduces a highly sensitive electrochemical sensor designed for the detection of the sports stimulant methyltestosterone, utilizing a unique ZnO/TiO 2 nanocomposite. Methyltestosterone, an extensively abused anabolic steroid in sports, calls for an efficient detection technique to maintain sporting integrity. The sensor was designed and synthesized with enhanced properties leveraging the specific characteristics of the ZnO/TiO 2 nanocomposite. The sensor demonstrated high sensitivity and selectivity towards methyltestosterone, outstripping traditional detection techniques. When subjected to real-world scenarios, including testing in synthetic urine samples, the sensor showcased outstanding precision and consistency, making it a robust tool for anti-doping control.
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RENEWABLE ENERGY
·
2023
·
IF 8.7
Shanshuai Chen,Puxiang Yan,Xiaona Yu,Wanbin Zhu,Hongliang Wang
The development of a highly active and robust catalyst for the conversion of lignin, the largest volume of renewable aromatic resource in nature, to value-added aromatics is of great importance in sustainable chemistry. However, the condensation of lignin depolymerization intermediates into recalcitrant macromolecules restricts high yields of desired products, and this remains a great challenge in lignin valorization. Here, a serious of bifunctional Ru–ZnO/SBA-15 catalysts were synthesized for lignin conversion to aromatics. Roles of Ru and ZnO in these catalysts for lignin conversion were in-depth analyzed. The effect of the ratio of Ru to ZnO was studied. Other reaction conditions including temperature and time were systematically optimized. More than 51.3% yields of aromatics were obtained over Ru–10ZnO/SBA-15 at 240 °C for 4 h. Structure-activity relationship research of the catalyst revealed that the high yield of product could be attributed to the following three reasons: 1) the Lewis acidic sites on Ru/SBA-15 are significantly improved after ZnO modification, and thus promotes the C–O bond cleavage ; 2) the oxophilic ZnO is beneficial to absorb the substrate and reaction intermediates, and therefore enhances the hydrodeoxygenation activity of the adjacent Ru; 3). The interaction between Zn and Ru in Ru–ZnO/SBA-15 changes Ru electronic properties and leads to the formation of highly active catalytic sites with high electron density. These results indicated that the bifunctional Ru–ZnO/SBA-15 catalyst with high catalytic activity could be a good choice for lignin conversion to high-yield aromatics.
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