JOURNAL OF MATERIALS SCIENCE
·
2013
·Vol. 48
·期 24
·8386-8392
·
IF 2.163
Du Pingfan,Song Lixin,Xiong Jie,Cao Houbao
TiO 2 and ZnO nanofibers were fabricated through a facile electrospinning method. The obtained nanofibers were characterized by a variety of analytical means including FESEM, TEM, SAED, XRD, UV–Vis, and PL. Compared with nanoparticles, nanofibers can be recycled more easily when they are used as photocatalysts. The photocatalytic activities of these two nanofibers were investigated and compared by evaluating the photodegradation of hazardous dye Rhodamine B. Although, ZnO nanofibrous photocatalyst exhibits better initial activity than TiO 2 nanofibrous counterpart, its photocatalytic performance is inferior to that of the latter on the whole. The photo-instability arising from photocorrosion may be responsible for its rapid deterioration in activity. The difference in the photocatalytic properties between TiO 2 and ZnO nanofibers was discussed, and a possible photodegradation mechanism of organic dyes in the presence of the nanofibrous photocatalyst was proposed. This work offers a direct insight into the comparison of photocatalysis of electrospun TiO 2 and ZnO nanofibers.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Haibo Jiang,Xin Ren,Xuebin Lao,Anting Kong,Meilian Zhong,Yan Sun,Yucong Wu,Zheng Yao,Liyi Shi
The effects of NiO content on the grain growth and the electrical properties of the ZnO varistors were studied. The effect on the grain growth was characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffractometer, while the effects on the electrical properties were investigated by varistor tester, pulse surge tester and precision impedance analyzer. The results showed that the growth of the (0002) plane of the ZnO varistors was inhibited by doping NiO, which improved the electrical properties of the varistors, especially the surge shock stability. The sample doped with 1.56 mol% NiO exhibited excellent electrical properties with breakdown voltage gradient of 184.0 V/mm, nonlinear coefficient of 72.7, leakage current of 0.37 µA, clamp voltage ratio of 2.20 under 8/20 μs waveform impact of 20 kA and change rates of positive and negative breakdown voltages of < 4% under 20 times impacts of 20 kA.
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CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 10
·14501-14507
·
IF 2.605
Yibing Lin,Yu Lin,Jihuai Wu,Yongguang Tu,Xiaolong Zhang,Biaopeng Fang
In this study, the different sizes of ZnO hierarchical spheres (ZnO HS) based on the aggregations of nanoparticles were synthesized through hydrolysis of zinc acetate dihydrate in water and applied to photoanodes of quantum dots-sensitized solar cells (QDSSCs). Among these, ZnO HS with a main diameter of less than 1 μm could significantly extend the traveling distance of light within the photoanode films as the scattering centers and ZnO nanoparticles could prevent the decrease of specific surface area. CdS and CdSe quantum dots were deposited by successive ionic layer absorption and reaction (SILAR) method and chemical bath deposition (CBD) respectively. Field-emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM) and X-ray diffraction (XRD) were used to identify the surface profile and crystal structure of ZnO HS photo-electrodes before and after depositing quantum dots . CdS/CdSe co-sensitized ZnO HS photoanodes demonstrated an overall power conversion efficiency of 4.13% under one sun illumination (100 mW cm −2 ), which is higher than that of CdS/CdSe co-sensitized ZnO nanoparticles (ZnO NP) photoanodes.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Wenrong Cao,Lifang Chen,Zhiwen Qi
Novel Ag/Ag 2 SO 4 /ZnO nanostructures were successfully fabricated by a facile microwave-assisted template-free hydrothermal method. The results reveal that Ag/Ag 2 SO 4 nanoparticles are uniformly dispersed on the surfaces of ZnO plates, which forms the hierarchical Ag/Ag 2 SO 4 /ZnO (AZ) nanostructures. The AZ-2 photocatalyst obtained by adjusting the amounts of thiourea and AgNO 3 with the molar ratio of 1:1 exhibits the highest photocatalytic efficiency, and rhodamine B can be decolorized within 35 min and 20 min under visible-light ( λ > 420 nm) and natural sunlight irradiation, respectively. The enhanced photocatalytic performance of AZ catalysts may result from the synergistic effects of Ag/Ag 2 SO 4 nanoparticles loaded on ZnO surfaces, which can enhance visible-light absorption capability of ZnO and promote photoinduced electron–hole separation. Therefore, the Ag/Ag 2 SO 4 nanoparticles doped on semiconductors can be used as effective visible-light photocatalysts and show a great potential for practical applications in the treatment of dye-containing wastewater.
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ACS Applied Energy Materials
·
2019
·
IF 0
Yuan Wang,Zhou Yang,Yunxia Huang,Yangxi Yan,Juan Hou,Zhimin Li,Guozhong Cao
Control of structural and compositional characteristics of photoanodes is a crucial step toward rapid transport of charges and high-efficiency loading of dye or quantum dots in the case of solar cell application. Hierarchical ZnO microspheres (ZMS) and TiO2 hybrid photoanode film were prepared for improved CdS/CdSe quantum dot sensitized solar cells (QDSCs). The addition of ZMS into TiO2 electrode films resulted in both increased short circuit current density (Jsc) and open circuit voltage (Voc). Such an improvement is ascribed to the increased light harvesting owing to scattering by ZMS and the reduced charge recombination due to the surface modification. TiO2/ZMS hybrid photoanode displays superior charge injection/transport performance due to the ZMS with unique hierarchical structure, providing charge transfer continuity and multiple electron transport channels for timely electron transport. As a result, the Jsc, Voc, and the photovoltaic conversion efficiency (PCE) were all remarkably enhanced with the insertion of hierarchical ZMS though varied appreciably with the amount of ZMS. Thus, the designed TiO2/ZMS heterostructure-based QDSCs with an optimizing ZMS ratio of 20 wt % achieved a PCE of 5.99%, which is about 35% increase of the efficiency for the devices without ZMS (4.45%).
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ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Zonghua Pu,Qian Liu,Abdullah H. Qusti,Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Xuping Sun
The present communication reports on the first electrodeposition of Ni(OH) 2 on ZnO array supported on Ni foam. When applied as a binder-free electrode material for pseudocapacitive energy storage, the resulting ZnO@Ni(OH) 2 array exhibits a high specific capacitance of 2028 F g −1 at a current density of 10 A g −1 with good cycling stability. Meanwhile, the array exhibits a superb rate capability. Even at an extremely high current density of 100 A g −1 , the array still shows a very high specific capacitance of 1059 F g −1 .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 6
·4669-4675
·
IF 1.798
Zhang Xiufang,Mei Jie,Wang Song,Zheng Yingying,Cui Can,Pan Jiaqi,Li Chaorong
The cotton cellulose nanofibers(CCNFs)/ZnO/CuS nanocomposites have been successfully fabricated by the electrospun-hydrothermal method and successive ionic layer adsorption. The results of XRD, SEM and TEM indicate that the CuS are successfully combined with the ZnO. The photocatalytic activity of the CCNFs/ZnO/CuS nanocomposites is investigated by the degradation of methylene blue under visible light irradiation, and it is demonstrated to be significantly enhanced after the CuS is introduced. Furthermore, the direct interfacial charge transfer of the ZnO/CuS is considered as the main reason for the enhancement.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Qi Lei,Xiaowen Zhang,Zhenghongri Zhang,Liuxue Liang,Qihua Liang
Reliable detection of triethylamine (TEA), a hazardous amine compound, is critical for occupational health and environmental safety. Whilst metal oxide semiconductor sensors are favored for their scalability and low cost, their response and selectivity are often limited. Flower-like Co 3 O 4 /ZnO heterojunction microspheres were synthesised via a solvothermal method, and the experimental results showed that the Co 3 O 4 /ZnO-5 mol% sensor has excellent sensing performance. The response value of 50 ppm TEA at 180°C was 387.2, which was 18 times that of the pure ZnO sensor, and it also exhibited excellent selectivity and good moisture resistance. Furthermore, it has a detection limit of ppb and shows long-term stability. This Co 3 O 4 /ZnO sensor was further applied to food freshness assessment, enabling rapid determination of food freshness through quantitative detection of TEA released during the spoilage of fish and meat. Mechanism studies show that the formation of Co 3 O 4 /ZnO heterojunction enhances electron-hole transfer and charge transfer, continuously promotes oxygen activation into chemisorbed oxygen, and provides active sites for the redox reaction of TEA. This study contributes to the application of TEA sensors and accelerates the development of the integration of experiments and applications.
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Materials Today Physics
·
2026
·
IF 9.3
Zhipeng Li,Xudong Li,Hongyan Zhang,Jie Ai,Haiyang Zhang,Chu Chen,Ling Zhang
A high-performance ammonia (NH 3 ) gas sensor based on ZnO/Ti 3 C 2 T x composites was fabricated using the hydrothermal method. The gas sensitivity test results show that the composite of Ti 3 C 2 T x and ZnO improves the sensing performance of Ti 3 C 2 T x -based NH 3 sensor at room temperature. The response of ZnO/Ti 3 C 2 T x to 200 ppm NH 3 is 158.7 and the response/recovery time is 3.6 s/0.9 s. Additionally, the sensor demonstrated excellent humidity resistance and long-term stability. This improvement is attributed to the introduction of additional free oxygen species and oxygen vacancies on the Ti 3 C 2 T x surface by ZnO, exposing more active metallic Ti sites. Simultaneously, reducing the number of -OH groups increases the number of -F groups and enhances the polarity of the -OH groups. DFT studies indicate that higher surface oxygen vacancy density promotes the formation of highly active and unsaturated Ti sites, thereby enhancing strong chemical adsorption of NH 3 . Concurrently, the reduction in -OH groups increases the polarity of -OH, thereby improving the adsorption efficiency of NH 3 molecules. Thus, modulating the Ti 3 C 2 T x surface with metal oxides to reduce hydroxyl groups and increase oxygen vacancies promotes the formation of Ti metal sites, offering a novel approach for developing high-performance room-temperature NH 3 gas sensors based on Ti 3 C 2 T x .
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ChemNanoMat
·
2026
·Vol. 12
·期 1
·e202500571
·
IF 2.6
Jufei Xu,Jie Yu,Neng Hu,Qi Zhong
The continuous existence of antibiotic pollutants presents a grave threat to the ecological environment. This study aims to develop an efficient and stable hybrid photocatalytic membrane for degrading tetracycline (TC) in aqueous solutions. Inspired by setaria, the novel hybrid ZIF-8@ZnO/polyvinylidene fluoride (PVDF) membranes (PZM) are successfully prepared by in situ growth of ZnO nanowires on PVDF membranes via hydrothermal synthesis, followed by incorporation of the metal–organic framework material ZIF-8. The preparation conditions for ZnO nanowires are systematically optimized. Results indicate that the prepared ZnO/PVDF membranes (PZ) exhibit optimal photocatalytic activity when the ZnO precursor concentration is 0.5 wt% and the hydrothermal growth time is 2 hr. Additionally, with the increased stirring rate of the reaction system, the superior piezoelectric properties of the PVDF nanofiber membranes are applied to accelerate TC degradation. Most importantly, compared to pure PZ membranes, the hybrid PZM membranes significantly enhance the photocatalytic degradation efficiency of TC. Under visible light irradiation, the hybrid PZM nanofiber membranes achieve TC degradation efficiency of 75%, which is increased by 66% compared to that of ZnO powder. This investigation offers a potentially viable approach for the design and construction of hybrid photocatalytic materials for effectively eliminating emerging organic pollutants from water.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Li-Juan Yue,Su-Mei Shen,Wen-Jie Zhang,Fei-Long Gong,Xuan-Yu Yang,Yong-Hui Zhang
The noble metal Pt modified ZnO nanomaterials are widely used to improve their gas sensing performance. However, the relationship between the catalytic effect of Pt x+ species on the oxygen vacancies formation and gas-sensing performance is still unclear. Herein, the Pt/ZnO nanorods are successfully synthesized by using hydrothermal method , and the content of Pt 0 species are finely tuned through treating in different atmospheres. Notably, Pt modified ZnO calcined under Ar/H 2 (Pt/ZnO-3) exhibits excellent sensing response (R a /R g = 2196, 81 times higher than pure ZnO) to 50 ppm triethylamine at 140 °C, with fast response/recovery behavior, low limit of detection, and superior selectivity. Detailed structural characterization indicates that Pt nanoparticle modification reduces the band gap of the samples. In addition, the high content of Pt 0 species promotes the generation of adsorbed oxygen, which significantly enhances the gas-sensitive performance of the sensor. This work demonstrates that the concentration of Pt 0 species greatly affects gas-sensing performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Kai Wan,Fang Wu,Yuanyao Dou,Liang Fang,Caiying Mao
Hexagonal Bi 2 Te 3 nanosheets with uniform morphology were facilely synthesized through a hydrothermal method at 180 °C. X ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and selected area electron diffraction (SAED) were employed to characterize the Bi 2 Te 3 nanosheets . The results clearly indicate that uniform Bi 2 Te 3 nanosheets with a side length of 300–400 nm were obtained. Bi 2 Te 3 nanosheet/ZnO nanoparticle (Bi 2 Te 3 NS/ZnO NP) composite photoanodes were fabricated with Bi 2 Te 3 NS concentration in the range of 0–0.25 at.%. The effect of Bi 2 Te 3 NS contents in composite photoanode on the performance of dye-sensitized solar cells (DSSCs) was systematically investigated. The photocurrent density-voltage ( J-V ) characteristics indicate that the DSSCs with Bi 2 Te 3 NS/ZnO NP composite photoanode exhibit significantly improved photovoltaic performance . Typically, the highest energy conversion efficiency of 4.10% which is increased by 46.95% compared with that of the bare ZnO can be achieved in the DSSC with 0.15 at.% Bi 2 Te 3 NS embedding. The EIS results further confirm that a moderate amount of Bi 2 Te 3 NS in photoanode could not only improve the electrons transport and suppress the charge recombination rate, but also enhance the electron collection efficiency. Furthermore, the excellent thermoelectric performance of Bi 2 Te 3 NS in the photoanode could greatly increase the electron density and lower the temperature of the DSSCs effectively. All these results suggest that the Bi 2 Te 3 NS/ZnO NP composite photoanode could highly enhance the performance of the DSSCs.
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