INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Yan Wang,Yihui Wang,Xueya Sun,Mengwei Li,Mingxin Tang,Jianliang Cao,Cong Qin
High-performance room-temperature hydrogen (H 2 ) sensors are the optimal choice for practical applications. Light excitation , especially visible light, is safer and requires less power compared to ultraviolet (UV) light. This makes it an effective method for achieving room temperature operation. In this study, different mass ratios of Pd-modified ZnO nanorods were synthesized using a combination of hydrothermal and impregnation methods, and their sensing performance to H 2 under visible light excitation was investigated. Material characterization results demonstrated that the localized surface plasmon resonance (LSPR) effect of Pd broadened the absorption in the visible light region, increasing the generation of high-energy hot electrons . Notably, the 2.5 wt% Pd/ZnO exhibited excellent sensing performance towards 5000 ppm H 2 at room temperature under visible light excitation, with a high response value of 5906.78. The LSPR effect and the catalytic activity of Pd nanoparticles significantly enhance the sensing performance of H 2 . Based on our current knowledge, there have been no explicit reports on the detection of H 2 using visible light excitation with Pd/ZnO, thus highlighting a new direction for the study of room temperature H 2 sensors.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 32
·1-16
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IF 2.8
Guan Jiayan,Liu Xiangchun,Bai Ningna,Wang Fei,Yang Zhe,Zhang Jie,Gao Feng,Zhang Ping,Wei Ziyao
High-performance fluorescent carbon quantum dots (CQDs) prepared by hydrothermal method using citric acid and polyethyleneimine as raw materials. TiO 2 /ZnO/CQDs ternary composites were obtained by compositing different contents of CQDs with TiO 2 /ZnO. The phase structure, morphology, photocatalytic performance, and photocatalytic mechanism of ternary TiO 2 /ZnO/CQDs were investigated. The result shows that the CQDs synthesized by the hydrothermal method have good whole dispersibility, spherical shape, and particle size of 3–5 nm. When the hydrothermal time is 4 h and the hydrothermal temperature is 220 °C, the fluorescence luminescence performance of the prepared CQDs is the best. The prepared CQDs were loaded on the surface of TiO 2 /ZnO to form ternary TiO 2 /ZnO/CQDs photocatalysts. The results find that no other new phase is produced by the complex, and the TCZ-1 sample (When the amount of CQDs is 1 mL, the prepared ternary composite photocatalyst.) has a uniform grain size, with an average grain size of about 20 nm. CQDs can reduce the band gap bandwidth of TiO 2 /ZnO, and the polar hydrophilic functional groups of CQDs are displayed in the composite, which improves the photocatalytic performance and stability of TiO 2 /ZnO. TCZ-1 sample has the best photocatalytic performance, and the photocatalytic degradation rate of methylene blue (MB) solution is 96.7% within 90 min, and after 5 cycles of degradation, it drops to 80.2%, which is improved compared with zinc oxide catalyst.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 48
·22090-22102
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IF 3.3
Shoujie Jiang,Lili Wang,Yuyang Zhou,Haixiang Wang,Qiaoli Lu,Jinmei Wang,Chunxia Wang,Dawei Gao
Antibiotics, such as tetracycline hydrochloride (TC), are persistent pollutants in the environment due to their difficult degradation properties. In this study, a MoS2/ZnO heterostructure nanocomposite was synthesized and evaluated for its photocatalytic performance in degrading TC under simulated sunlight irradiation. The degradation rate of TC in the MoS2/ZnO/PMS system reached 99.8% after 30 min, surpassing the rates observed in both ZnO and MoS2/ZnO systems. The presence of active species, including superoxide radicals (˙O2−), hydroxyl radicals (˙OH), sulfate (SO4˙−) and singlet oxygen (1O2), was confirmed through trapping experiments and electron paramagnetic resonance (ESR) analysis. The MoS2/ZnO heterostructure effectively suppressed the recombination of photogenerated charge carriers, leading to improved photocatalytic efficiency. The results demonstrate the potential of the MoS2/ZnO/PMS system as a low cost and efficient method for the removal of TC from water. This study contributes to the development of photocatalytic materials for the degradation of persistent organic pollutants in aqueous environments.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Feihu Li,Junjie Jing,Jinkun Li,Shuni Li,Siyu Ye,Xinru Song,Zili Zhan,Yeguang Zhang
The development of metal oxide semiconductor-based chemiresistive gas sensors with ultra-fast response/recovery for toxic and flammable gases is of great importance, but still challenging. Here, ZnO-SnO 2 heterojunction three-dimensional (3D) inverse opal photonic crystal balls (IOPBs) were fabricated based on rapid and liquid waste-free spray drying. The spherical three-dimensional (3D) ordered macroporous skeleton can provide more active sites and faster gas diffusion channels. Furthermore, the n-n heterojunction established by ZnO and SnO 2 is favorable for electron transport . The response (Ra/Rg) of IOPBs to 50 ppm acetone reaches 40.3 at an optimal operating temperature of 260 °C when the Zn/Sn atomic ratio is 1:4, which is 5 times higher than that of the pure SnO 2 sensor. Response/recovery time also reduces from 23/47 s for pure SnO 2 to 6/10 s. In addition, the IOPBs gas sensors also exhibit good selectivity and excellent long-term stability. This work provides a straightforward and versatile synthetic route for the preparation of 3D IOPBs to explore novel gas sensors with ultra-fast response speed.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Jiaochun Zheng,Mao Deng,Yang Shi,Zhangyi Huang,Haomin Wang
The cold sintering process, a novel technique for low-temperature ceramic processing , effectively removes interparticle pores via dissolution and re-precipitation. However, it often triggers grain growth, especially in nanocrystalline ceramics. To address this issue, the present study proposed an innovative two-step cold sintering process with an initial step at 1.5 GPa/RT (room temperature) for 10 min, followed by a subsequent step at 300 MPa/250 °C for 45 min. This method yields ZnO nanocrystalline ceramics with 97.5 % relative density and a 39 nm average grain size (from 30 nm powder). The initial high-pressure step significantly enhances the pressure gradient and particle solubility, leading to very high supersaturation and the occurrence of homogenous nucleation during pressure release. Subsequently, the formation of the crystal nuclei in the interparticle voids can dramatically improve the density of the compact by the additional pore filling and avoid recrystallization-induced grain growth during the second-step cold sintering process.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2023
·Vol. 170
·期 10
·104503
·
IF 3.9
Hao Wang,Enyi Hu,Faze Wang,Bin Zhu
Energy band alignment in ZnO-Sm2O3 was proposed to design promising electrolyte materials for low temperature ceramic fuel cells. The arrangement of energy bands leads to local electric field at the interface, avoiding short-circuit problems and accelerating ion conduction in ZnO-Sm2O3 electrolyte low temperature ceramic fuel cells. The optimized composite electrolyte 7ZnO-3Sm2O3 fuel cell devices an appreciable maximum power density of 790 mW cm−2 and stable power density of 125 mW cm−2 for 40 h at 500 °C.
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PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Kang Feng,Haoyi Qiu,Anna Gapeeva,Xia Li,Yan Li,Sören Kaps,Yogendra Kumar Mishra,Rainer Adelung,Martina Baum,Liangmin Yu
Antifouling coatings for marine use are a widely employed method for controlling the settlement and growth of unwanted aquatic organisms on surfaces. In this study, indole derivative N-(1 H -5-bromo indole-3-ylmethyl) acrylamide (BIAM)-functionalized polythiourethane (PTU)/tetrapodal shaped zinc oxide (t-ZnO) nanocomposites (PTU/BIAM/t-ZnO) were synthesized through a Friedel–Crafts Alkylation reaction, thiol-ene click reaction and polyaddition reaction . Nanocomposites' surface characteristics, such as surface free energy , chemical composition, and surface morphology were investigated here. The mechanical characteristics and antifouling properties of the coating materials were also considered. These nanocomposites exhibited not only superior mechanical properties, due to the presence of both PTU and t-ZnO, but also promising antifouling properties owing to the incorporation of BIAM on their surfaces. The adhesion strength of the nanocomposites increased from 0.26 MPa to 0.68 MPa due to the incorporation of t-ZnO particles. Benefiting from the PTU matrix, the tensile strength of nanocomposite can reach over 57 MPa. The PTU/BIAM/t-ZnO nanocomposites demonstrated improved algae resistance and marine antifouling performance compared to the reference PTU/t-ZnO nanocomposite without indole derivative. The PTU/BIAM/t-ZnO nanocomposites exhibit resistance to fouling organisms due to the synergistic effect of the easy-to-clean characteristic of the PTU/t-ZnO and the reduction of the polar component of the surface free energy resulting from the inclusion of indole derivative BIAM on the surface. This, in turn, reduces the interaction between fouling organisms and the material surface. Furthermore, BIAM interferes with the homeostasis of cellular calcium ions , thereby hindering the attachment of fouling organisms. Under the combined action of PTU, BIAM, and t-ZnO, the synergistic effect of good antifouling properties, environmental compatibility, good mechanical properties and strong adhesion to the substrate was achieved.
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MODERN PHYSICS LETTERS B
·
2023
·
IF 1.9
Qian-Qian Zhang,Shu-Yi Ma,Xiang-Bing Li,Fang-Qiang Yuan
The ZnO-10, ZnO-20, ZnO-30, and ZnO-40 nanopetal-shaped samples were successfully synthesized by a hydrothermal method. The results of XRD, SEM, TEM, and BET indicate that the micro–nano petal-like samples have the advantages of high purity, good crystallinity, and large specific surface area. The ZnO-20 sample with the largest specific surface area and pore volume was prepared by adjusting the scheme without changing the sample morphology. The specific surface area and pore volume of the sample were 33.6914 m 2 /g and 0.1561 ml/g. The results of gas sensitivity test show that the sample has the highest response and super good gas sensitivity selectivity. At 250 ∘ C, the responses to 5 ppm and 50 ppm ethylene glycol can reach 14.4 and 293, respectively. Because of the excellent gas performance of ZnO nanosheets, this work can provide a theoretical basis for the research and development of ultra-sensitive ethylene glycol gas sensors in the industry.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhilin Feng,Hongtao Wang,Yaodan Zhang,Dan Han,Yongqiang Cheng,Aoqun Jian,Shengbo Sang
The development of NO 2 gas sensors with lower operating temperature and good thermal stability is always a challenge to solve. In this work, 2D loose porous ZnO/GaN heterogeneous nanosheets were synthesized by ultrasonic mixing, in which ZnO nanosheets and GaN nanoparticles were prepared by hydrothermal method and solid-state pyrolysis , respectively. BET characterization result showed that the specific surface area of loose porous ZnO nanosheets was 57.24 m 2 /g, and XPS tests proved that the formation of heterogeneous interface between ZnO and GaN can effectively increase the number of negative oxygen ion species on the surface. Noticeably, 15 mol % ZnO/GaN composites (Ga:Zn) exhibited the highest response of 134.5–2 ppm of NO 2 at 125 °C and lower limit of detection of 20 ppb. Furthermore, it showed outstanding selectivity, repeatability and long-term stability. The excellent gas-sensing properties can be attributed to the loose porous structure of ZnO and the formation of n-n heterojunction between ZnO and GaN. The gas-sensing mechanism of ZnO/GaN composites to NO 2 was also discussed in detail.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Xian Li,Chengcheng Xu,Jie Sun,Yin Long,Yang Wang,Zhemin Li,Chunjiang Bai,Xiaosong Du
Ethylene is one of the important indicators to reflect the ripeness and senescence of the fruit. Ethylene sensor can be applied for fast ethylene detection nondestructively, yet high temperature condition of the common metal oxide semiconductors restrains its agricultural applications. Herein, porous-ZnO/carbon nanofibers (CNFs) three-dimensional structure, derived from Zeolite imidazole framework-8 (ZIF-8) /polyacrylonitrile (PAN) electrospun nanofibers, was proposed and further optimized. The results showed that porous-ZnO/CNFs exhibited increasing resistance to reducing ethylene at room temperature , well explained by the Fermi levels’ relative position of the sensing system. Repeatability, selectivity and stability were demonstrated. The addition of porous-ZnO (10 % composting mass ratio) resulted in a 428 % increase in the ethylene-sensing response compared with CNFs, and a 64.2 % improvement compared with ZnO/CNFs. The outstanding sensing performance can be attributed to the synergistic effect of porous and interconnected morphology, the formed p-n heterojunction , as well as oxygen-vacancy effect. This strategy is beneficial for designing efficient gas sensors at room temperature, and exploring the application of the advanced gas sensors in intelligent agriculture field.
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Polymers
·
2023
·Vol. 16
·期 1
·116
·
IF 5
Muhammad Waseem,Yuxiang Xie,Kesong Yu,Xiling Zhou,Yingchun Cai,Xiaoli Zhang,Baochen Liu,Jingbo Chen
Electromagnetic wave pollution has become a significant harm posed to human health and precision instruments. To shelter such instruments from electromagnetic radiation, high-frequency electromagnetic interference (EMI) shielding materials are extremely desirable. The focus of this research is lightweight, high-absorption EMI shielding composites. Simple aqueous dispersion and drying procedures were used to prepare cotton fiber (CF)-based sheets combined with various zinc oxide (ZnO) contents. These composites were carbonated in a high-temperature furnace at 800 °C for two hours. The obtained CF/ZnO samples have densities of 1.02–1.08 g/cm3. The EMI shielding effectiveness of CF-30% ZnO, CF-50% ZnO, and CF-70% ZnO reached 32.06, 38.08, and 34.69 dB, respectively, to which more than 80% of absorption is attributed. The synergetic effects of carbon networks and surface structures are responsible for the high EMI shielding performance; various reflections inside the interconnected networks may also help in improving their EMI shielding performance.Keywords:cotton fiber;zinc oxide;carbonation;electromagnetic interference shielding;composites
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Linyun Zhang,Shanxin Li,Lihong Duan,Xuzhou Jiang,Yijing Sun,Hongying Yu
Core-shell structural design is an attractive strategy to achieve high-performance microwave absorbers. Nevertheless, it still remains a problem to simultaneously obtain superior microwave dissipation and impedance matching for microwave absorption (MA) materials. In this work, ZnO-NiCo 2 O 4 -NiCo 2 O 4 (ZNN) core–shell microstructure is designed and fabricated by covering NiCo 2 O 4 nanosheets on the surface of ZnO nanorod and next growth of NiCo 2 O 4 nanoparticles. With the synergies from the NiCo 2 O 4 nanosheets improving the microwave attenuation capability and the NiCo 2 O 4 nanoparticles increasing the impedance matching, ZNN possesses efficient MA performance: the strongest reflection loss is −59.93 dB at the corresponding thickness of 2.6 mm, and the maximum absorption bandwidth is 7.04 GHz at 2.4 mm, which covers the entire Ku-band. RCS simulation also indicates that ZNN has outstanding MA performance. Moreover, this study proposes a point for the utilization of nickel–cobalt oxides in MA materials, and offers a reference for the design of core–shell structural absorbers.
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