Catalysis Science & Technology
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2024
·
IF 4.4
Chunlai Zhang,Yingdong Hao,Xingbo Wang,Deng Hu,Nannan Sun,Wei Wei
Photocatalysis is a highly promising strategy for the direct conversion of inert methane (CH4). In this study, a ZnO semiconductor with a nanorod morphology (r-ZnO) was synthesized using a template-directed hydrothermal method, which was further used to prepare nAg/r-ZnO photocatalysts through impregnation and reduction. The structure, composition, and microstructure of nAg/r-ZnO were characterized using techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and UV-visible absorption spectroscopy (UV-vis). The in-depth mechanism of the photocatalytic conversion of CH4 was revealed through electron paramagnetic resonance (EPR) and radical capture experiments. The results showed that the introduction of Ag species promoted the separation of photoinduced electron (e−) and hole (h+) pairs, which facilitated the generation of reactive oxygen species (ROS). Therefore, the performance of photocatalytic CH4 oxidation can be significantly enhanced. Interestingly, formaldehyde (HCHO) was generated as the primary product instead of low-value methanol (CH3OH). Through optimization of Ag loading and reaction conditions, an excellent oxygenate (CH3OOH, CH3OH, and HCHO) yield of 15 551.60 μmol g−1 h−1 with a high selectivity of 98.46% was achieved simultaneously, which has been rarely reported in previous studies.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 5
·522
·
IF 2.589
Xinying Yang,Jin Tian,Yang Guo,Mengyuan Teng,Haixia Liu,Tianduo Li,Pingli Lv,Xuping Wang
Zinc oxide (ZnO) possesses superior chemical and physical properties so that it can occupy an essential position in the application of nanostructures. In this paper, ZnO nano-rod arrays were synthesized by a simple one-step hydrothermal approach with the assistance of cetyl trimethyl ammonium bromide (CTAB). Exposure of the {0001} facets could be controlled by adjusting the amount of CTAB and the maximum exposure of the {0001} facets of ZnO nanorods is obtained at 1.2 g of CTAB. The photocurrent, EIS, and PL measurements support the facile charge transfer with minimum recombination of the photogenerated excitons of the ZnO nano-rod arrays obtained at 1.2 g of CTAB. Consequently, the obtained ZnO nano-rod arrays at the optimal CTAB of 1.2 g exhibit an excellent photocatalytic degradation rate of 99.7% for rhodamine B (RhB), while the degradation rate of RhB by the ZnO obtained without CTAB is only 35%.Keywords:ZnO nano-rod arrays;morphology;{0001} facets;photocatalytic activity
研究领域:
材料科学
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化学
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DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 1
·233
·
IF 5.076
Ying Li,Tie Liu,Shuang Feng,Wenshu Yang,Ying Zhu,Yingying Zhao,Zhiyan Liu,Haibin Yang,Wuyou Fu
Herein, a novel actinomorphic flower-like ZnO/Au/CdS nanorods ternary composite photocatalyst is prepared to extend the light-responsive range, reduce the photogenerated charge carriers recombination, and ultimately improve the water splitting performance. Flower-like ZnO nanorods are synthesized by a chemical bath method and the CdS nanoparticles are sensitized by successive ionic layer adsorption and reaction method. Then the Au nanoparticles as co-catalysts are introduced by the photodeposition method to modify the interface of ZnO/CdS for reducing the photogenerated electron recombination rate and further improving the performance of water splitting. Detailed characterizations and measurements are employed to analyse the crystallinity, morphology, composition, and optical properties of the flower-like ZnO/Au/CdS nanorods samples. As a result, the flower-like ZnO/Au/CdS nanorod samples present significantly enhanced water splitting performance with a high gas evolution rate of 502.2 μmol/g/h, which is about 22.5 and 1.5 times higher than that of the pure ZnO sample and ZnO/CdS sample. The results demonstrate that the flower-like ZnO/Au/CdS nanorods ternary composite materials have great application potential in photocatalytic water splitting for the hydrogen evolution field.Keywords:flower-like ZnO nanorods;Au;CdS;photocatalytic water splitting
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
Small Methods
·
2024
·
IF 10.7
Lirong He,Xingang Liu,Cheng Han,Dehui Wang,Qi Wang,Xu Deng,Chuhong Zhang
For polyvinylidene fluoride (PVDF) based piezoelectric composites, epitaxial growth of ZnO nanorods (ZnO-nr) piezoceramic layer on PVDF is an effective way to improve their piezoelectric performance. However, the crystal nucleus of ZnO featuring polar surfaces that cannot be directly attached to hydrophobic PVDF with low surface energy. Herein, direct ink writing (DIW) 3D printing is employed for the first time to create β-PVDF reservoirs with significantly enhanced surface energy, facilitating the attachment and epitaxial growth of ZnO-nr. The printed β -PVDF reservoirs designed with programmed macro-pores and abundant inner micropores, enable a higher loading of ZnO-nr by more than one magnitude, thereby boosting the electro-mechanical response. The resulting PVDF/ZnO core–shell piezoelectric energy harvester (PEH) delivers an output voltage of 33.2 V, as well as an unprecedentedly high relative output voltage of 2.76 V/wt.%, which is 2.63 times that of the state-of-the-art 3D-printed PVDF/piezoceramics PEHs. Furthermore, it can differentiate subtle human motions whereas hybrid PEHs cannot distinct. This work demonstrates that the DIW 3D printing approach offers a simple and convenient design idea for creating high performance PEHs.
研究领域:
材料科学
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能源技术
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纳米科技
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DOI
PubMed
高影响因子
RSC Advances
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2023
·Vol. 13
·期 8
·5208-5218
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IF 3.9
Thi Viet Ha Luu,Ngoc Nhiem Dao,Hoang Ai Le Pham,Quang Bac Nguyen,Van Cuong Nguyen,Phuc Huu Dang
In this work, Ta-doped ZnO (Ta-ZnO) nanomaterials were synthesized by the hydrothermal method at different temperatures (110, 150, and 170 °C) for the photodegradation of methylene blue (MB) under visible light. Ta doping significantly affects the crystal defects, optical properties, and MB photocatalytic efficiency of ZnO materials. The optical absorption edge of Ta-ZnO 150 was redshifted compared to undoped ZnO, correlating to bandgap narrowing (EgTa–ZnO = 2.92 eV; EgZnO = 3.07 eV), implying that Ta doped ZnO is capable of absorbing visible light. Besides, Ta-doping was the reason for enhanced blue light emission in the photoluminescence spectrum, which is related to the oxygen defect V0O. It is also observed in the XPS spectra, where the percentage of oxygen in the oxygen-deficient regions (O531.5 eV) of Ta-ZnO150 is higher than that of ZnO150. It is an important factor in enhancing ZnO's photocatalytic efficiency. The MB degradation efficiency of Ta-doped ZnO reached the highest for Ta-ZnO 150 and was 2.5 times higher than ZnO under a halogen lamp (HL). Notably, the influence of hydrothermal temperature on the structural, morphological, and photoelectrochemical properties was discussed in detail. As a result, the optimal hydrothermal temperature for synthesizing the nanorod is 150 °C. Furthermore, photocatalytic experiments were also performed under simulated sunlight and natural sunlight. The nature of the photo-oxidative degradation of MB was also investigated.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Zongqi Zhang,Xiaxi Yao,Xiang Liu
Solar-driven water splitting devoid of noble-metal co-catalysts is a promising and cost-efficient strategy for the production of clean and sustainable energy, namely hydrogen. The primary impediment to the practical application of photocatalysts lies in the efficiency of separation of photo-induced charge carriers. Herein, two core–shell ternary nanorod photocatalysts based on ZnO, ZnO@CuS@ZnS and ZnO@ZnS@CuS, were obtained via a facile surface sulfidation strategy. Intriguingly, it was discovered that the performance of hydrogen evolution of these photocatalysts was contingent upon the sequence of sulfidation. Meanwhile, the as-prepared photocatalysts displayed distinct advantages in different aspects. ZnO@CuS@ZnS exhibited a lower activation energy barrier, while ZnO@ZnS@CuS presented a more suppressed electron-hole pairs recombination. The composites exhibited high-efficiency of hydrogen evolution rates, 2.79 µmol·mg −1 ·h −1 (ZnO@CuS@ZnS) and 9.48 µmol·mg −1 ·h −1 (ZnO@ZnS@CuS), along with stable (20 h) performance. This phenomenon has been ascribed to the development of an n-p heterojunction structure, Z-scheme charge transfer mechanism, and the high-performing light-triggered charge separation to relatively extended lifetimes of 5.06 µs and 6.06 µs, respectively. This research may deliver significant understanding of the designation of economical and scalable ZnO-based heterojunction photocatalysts for hydrogen evolution reactions in photocatalysis.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2014
·Vol. 25
·期 2
·221-229
·
IF 10.439
Chuang Han,Zhang Chen,Nan Zhang,Juan Carlos Colmenares,Yi-Jun Xu
A simple, low-temperature synthesis approach is reported for planting CdS-sensitized 1D ZnO nanorod arrays on the 2D graphene (GR) sheet to obtain the ternary hierarchical nanostructures, during which graphene oxide (GO) as the precursor of GR acts as a flexible substrate for the formation of ZnO nanorod arrays. The hierarchical CdS-1D ZnO-2D GR hybrids can serve as an efficient visible-light-driven photocatalyst for selective organic transformations. The fast electron transport of 1D ZnO nanorods, the well-known electronic conductivity of 2D GR, the intense visible-light absorption of CdS, the unique hierarchical structure, and the matched energy levels of CdS, ZnO and GR efficiently boost the photogenerated charge carriers separation and transfer across the interfacial domain of hierarchical CdS-1D ZnO-2D GR hybrids under visible light irradiation via three-level electron transfer process. Furthermore, the superior reusability of ternary hybrids is achieved by controlling the reaction parameters, i.e., using visible light irradiation and holes scavenger to prevent ZnO and CdS from photocorrosion. This work demonstrates a facile way of fabricating hierarchical CdS-1D ZnO-2D GR hybrids in a controlled manner and highlights a promising scope of adopting integrative photosensitization and co-catalyst strategy to design more efficient semiconductor-based composite photocatalysts toward solar energy capture and conversion.
研究领域:
材料科学
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环境科学
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纳米技术
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DOI
高影响因子
SENSORS
·
2017
·Vol. 17
·期 10
·2214
·
IF 2.677
Fan Zhou,Weixuan Jing,Pengcheng Liu,Dejun Han,Zhuangde Jiang,Zhengying Wei
In this paper, the performance of a zinc oxide (ZnO) nanorod-based enzymatic glucose sensor was enhanced with silver (Ag)-doped ZnO (ZnO-Ag) nanorods. The effect of the doped Ag on the surface morphologies, wettability, and electron transfer capability of the ZnO-Ag nanorods, as well as the catalytic character of glucose oxidase (GOx) and the performance of the glucose sensor was investigated. The results indicate that the doped Ag slightly weakens the surface roughness and hydrophilicity of the ZnO-Ag nanorods, but remarkably increases their electron transfer ability and enhances the catalytic character of GOx. Consequently, the combined effects of the above influencing factors lead to a notable improvement of the performance of the glucose sensor, that is, the sensitivity increases and the detection limit decreases. The optimal amount of the doped Ag is determined to be 2 mM, and the corresponding glucose sensor exhibits a sensitivity of 3.85 μA/(mM·cm2), detection limit of 1.5 μM, linear range of 1.5 × 10−3–6.5 mM, and Michaelis-Menten constant of 3.87 mM. Moreover, the glucose sensor shows excellent selectivity to urea, ascorbic acid, and uric acid, in addition to displaying good storage stability. These results demonstrate that ZnO-Ag nanorods are promising matrix materials for the construction of other enzymatic biosensors.Keywords:ZnO nanorod;doping;surface morphology;wettability;glucose sensor
研究领域:
材料科学
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生物医学工程
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电化学
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Lixiong Qian,Lei Yao,Yunpeng Liu,Hao Wang,Jiajun Zhong,Chao Liu,Guang Mo,Xueqing Xing,Zhongjun Chen,Zhonghua Wu
The formation mechanism of nanoparticles is of great significance for the controllable synthesis, structural design, and performance optimization of nanomaterials. In this paper, an economical hydrothermal method was used to synthesize zinc oxide (ZnO) nanorods. X-ray diffraction, X-ray absorption fine structure, and small-angle X-ray scattering techniques were used to probe the structural changes. Scanning electron microscopy and high-resolution transmission electron microscopy were used to observe the morphologies of the products. A self-designed in situ temperature–pressure sample cell was used to control the hydrothermal conditions. The results demonstrate that an unknown intermediate phase, Zn(HCO3)2·H2O, was first formed at 50 °C, having a morphology of nanoflakes with a average thickness of about 35 nm. The intermediate phase Zn(HCO3)2·H2O was determined to have a monoclinic structure with space group P1211 and the following lattice parameters: a = 11.567 Å, b = 3.410 Å, c = 5.358 Å, β = 96.0011°, and Z = 2. After a hydrothermal temperature of 140 °C, CO2 and H2O were evaporated from the Zn(HCO3)2·H2O intermediate product and the ZnO nanorods with a wurtzite structure were formed. The final ZnO nanorods have an average diameter of about 45 nm and an average length of about 2 μm. The axial direction of the ZnO nanorods is the [001] crystallographic direction. By virtue of understanding the formation mechanism, this work is helpful for the controllable synthesis of ZnO nanoparticles.
研究领域:
材料科学
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纳米技术
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yurong Zhao,Xing Xing,Congbin Xu,Yali He,Chen Yang,Jianzhong Zheng,Zhiqiang Hu
Maintaining hydrophobicity of the membrane in membrane distillation is vital for treating high-salinity feedwater containing surface active substances due to their wetting impact on the membrane. An effective approach to mitigate membrane wetting is to build rough nanostructures on a pristine membrane to render its surface omniphobic. Directly building nanostructures on polypropylene (PP), however, is challenging, as the material is chemically inert. In this study, a novel method was developed to physically plant ZnO seeds on the PP membrane above the material’s heat deflection temperature. A biomimetic nanostructure was then constructed on the membrane surface by growing fluorinated ZnO nanorods along the seeded PP substrate. The resulting omniphobic membrane exhibited a contact angle constantly above 160° against a test solution containing 50 g/L NaCl and 0.06 mM sodium dodecyl benzenesulfonate. Compared to the pristine PP membrane, the modified PP membrane showed a nearly complete salt rejection and much improved antiwetting capacity against the surfactant added in the test solution. The physical seeding method presented in this study is therefore a promising alternative approach to functionalize chemically inert polymeric substrates with constructed biomimetic nanostructures.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Xuejiao Wang,Xupeng Zhu,Yufeng Tao,Erjin Zhang,Xudong Ren
Pesticide residues threaten the ecological environment and human health. Therefore, developing high performance SERS substrate to achieve highly sensitive detection of pesticide residues is meaningful. In this study, based on the strategy of combining “hot spots” engineering and material hybridization, we construct a novel hybrid SERS substrate by depositing Ag nanoflowers (NFs) on ZnO nanorods (NRs). Benefiting from the synergistic effect of electromagnetic enhancement and charge transfer effect, the Ag NFs@ZnO NRs substrate exhibits a low detection limit (10 −13 M) for crystal violet molecules. This SERS substrate has good uniformity with a relative standard deviation of 7.463 %. Besides, owning to the photocatalytic property of ZnO NRs, the hybrid substrate can degrade probe molecules after SERS detection and realize recyclability. As a demonstration, we employed our SERS substrate for the trace detection of pesticide residues on apple surface and in river water. This study provides a new idea for improving the SERS performance of hybrid substrates.
研究领域:
材料科学
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环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Rui Gao,Xiangbo Ma,Lihong Liu,Shan Gao,Xianfa Zhang,Yingming Xu,Xiaoli Cheng,Hui Zhao,Lihua Huo
The o-methoxyaniline (OMA) monomer was polymerized in-situ by vapor phase polymerization to form uniform and dense poly-o-methoxyaniline (POMA) film on the surface of ZnO nanorods array film which was pre-prepared by hydrothermal method . The as-prepared POMA/ZnO composite shows the best response at 40 min of vapor phase polymerization time. The response to 100 ppm ammonia at 25 °C is 8.88. The recovery time of 136 s has a certain advantage in the reported room temperature ammonia sensors. The lowest detectable concentration is as low as 0.01 ppm. The fast recovery time and low detection limit make the sensor have broad application prospects. In order to explore the response mechanism of POMA/ZnO composite to ammonia gas, the work function of POMA and ZnO and corresponding band gap energies were tested respectively. And the effect of the formation of p-n heterostructure on gas response was further explored. The actual application test results reflect that the sensor can effectively identify NH 3 in the mixed gas during the production, storage and transportation of NH 3 . This can provide real-time early warning of NH 3 leakage. Especially, the sensor can detect trace amount of NH 3 in the human body's exhaled breath which is expected to realize the preliminary screening of patients with kidney disease through the detection of exhaled breath in the medical field.
研究领域:
材料科学
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化学传感器
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纳米技术
·
医学诊断
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DOI
高影响因子
危险品化学品经营许可证（带存储）