Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 26
·10282-10293
·
IF 8.262
Yidong Zhang,Baoping Lin,Junchuan Wang,Jiahui Tian,Ying Sun,Xueqin Zhang,Hong Yang
Currently, the development of two kinds of materials from a single precursor has been an important frontier in material synthesis. In this study, we have successfully fabricated a single precursor using metal–organic frameworks (MOFs) (zeolitic imidazolate framework, ZIF-8) and carbon nanotubes (CNTs). ZnO quantum dots (QDs)/carbon/CNTs and porous N-doped carbon/CNTs have been selectively synthesized from a single ZIF-8/CNTs template. When the two derived materials were used for supercapacitor electrodes, they showed high capacitance values (185 F g−1 g for ZnO QDs/carbon/CNTs at 0.5 A g−1 and 250 F g−1 g for porous N-doped carbon/CNTs at 1 A g−1, respectively). Further, an all-solid-state asymmetric supercapacitor (ASC) device using ZnO QDs/carbon/CNTs as the positive electrode and porous N-doped carbon/CNTs as the negative electrode was fabricated, and this device could reach a working potential of 1.7 V, delivering a maximum energy density of 23.6 W h kg−1 and a maximum power density of 16.9 kW kg−1, which are better than those of the ZnO-based symmetric or asymmetric supercapacitor devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Longkai Pan,Li Yao,Hui Mei,Hongxia Liu,Zhipeng Jin,Shixiang Zhou,Minggang Zhang,Gangqiang Zhu,Laifei Cheng,Litong Zhang
In this study, a novel 3D Bi 2 S 3 /P-ZnO S-scheme gyroid metamaterial was prepared by 3D printing and the hydrothermal method. The unique gyroid macrostructure and nanoarray microstructure offer a large volume of active sites for the photothermal catalytic reaction, thus improving the overall utilization rate of light. ZnO obtained by sintering the precursor produces oxygen vacancies, primarily due to P doping. This enables it to have a photothermal effect. After loading Bi 2 S 3 , the photothermal effect of P-ZnO and Bi 2 S 3 is coupled, further increasing the surface temperature of composite structure and speeding up the reaction rate. P-ZnO and Bi 2 S 3 formed a S-scheme heterojunction, promoting the separation and transfer of photogenerated carriers. Under simulated sunlight, the CO and CH 4 yield of Bi 2 S 3 /P-ZnO S-scheme gyroid metamaterials are 8.87 and 1.49 μmol h −1 . These are 3.45 times and 4.65 times of P-ZnO gyroid structure, respectively. Through SEM, TEM, XPS, ESR and in-situ FTIR characterizations, the transfer paths of photogenerated carriers between heterojunctions were revealed, and the reaction paths of photothermal catalytic CO 2 reduction were explored. The co-design of 3D structure and material allows for a novel concept for further improving photothermal catalytic performance.
研究领域:
材料科学
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化学工程
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环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Advanced Dielectrics
·
2024
·
IF 2.1
Yao Feng,Jinhua Li,Hao Yan
In this work, a series of BiFeO 3 /ZnO composites with varying molar ratio of BiFeO 3 to ZnO (Bi:Zn = 2.5:1, 5:1, 10:1, 20:1) have been synthesized via a one-step hydrothermal method and evaluated for their efficiency in rhodamine B (RhB) degradation performance. The morphology results reveal that the microsphere-shaped ZnO is dispersed on the surface of the blocky-like BiFeO 3 , with intimate contact between the two phases. It has been found that the maximum piezocatalytic activity could be achieved at BiFeO 3 /ZnO molar ratio of 5:1, with a degradation rate up to 92% for RhB. Compared with pure BiFeO 3 and ZnO, the composites have superior piezocatalytic degradation performance. The reason for the enhanced piezocatalytic dye degradation rate may be that the BiFeO 3 /ZnO composites effectively separate the positive and negative charges to reduce the recombination of positive and negative charges. These active species, such as superoxide radicals ( O 2 • − ) in the process of piezocatalytic, are proved on the active species capture experiments. The BiFeO 3 /ZnO composites have good piezocatalytic degradation performance, which provides an option for collecting vibration energy to degradation dye wastewater in the future.
研究领域:
材料科学
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环境催化
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纳米材料
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压电催化
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2023
·Vol. 36
·期 2
·e202300237
·
IF 3
Toleshi Teshome,Shimeles Addisu Kitte,Abera Gure,Guta Gonfa
The co-precipitation approach was employed in this study to create Fe doped ZnO (Fe-ZnO) nanoparticles (NPs). To characterize the synthesized NPs, Ultra violet-Visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) were used. Here, a novel electrochemical approach for the detection of tryptophan (Trp) using a glassy carbon electrode modified with Fe-ZnO NPs (Fe-ZnO/GCE) is demonstrated. The research findings revealed that Fe-ZnO/GCE enhanced the electron transfer rate of Trp oxidation. The sensitivity of Trp detection using Fe-ZnO/GCE in phosphate buffer solution (PBS) at pH 64.0 was significantly improved compared to bare GCE due to the electrocatalytic activity of Fe-ZnO NPs. Fe-ZnO/GCE exhibited a linear response with Trp concentrations ranging from 0.1 to 150 μM with the limit of detection (LOD) is 0.089 μM (3σ /m ) and limit of quantification (LOQ) about 0.3 μM (10σ /m ) using linear sweep voltammetry (LSV). The Fe-ZnO/GCE sensor was also effectively used to detect Trp in African catfish and multivitamin tablets. Trp analysis in real samples exhibited good recovery values of 89.60 to 99.15 %, demonstrating the accuracy and practicality of the method.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Cong Zhang,Jujie Ren,Yifei Xing,Min Cui,Na Li,Peng Liu,Xiaofang Wen,Meng Li
In this work, PdNPs@ZnO-Co 3 O 4 was synthesized via the facile oxidation treatment of bimetallic ZnCo-zeolitic-imidazolate-framework (ZnCo-ZIF) followed by in situ chemical reduction of PdNPs on the surface of the nanocrystals. After combined with MWCNTs, the PdNPs@ZnO-Co 3 O 4 -MWCNTs nanocomposites were formed, which were then exploited as novel electrode materials to construct the non-enzyme electrochemical sensors for high-sensitivity detection of tanshinol. Due to the high catalytic activity of multi-metallic PdNPs@ZnO-Co 3 O 4 , and the excellent charge transfer property between imidazole groups of the ligands in MOFs and MWCNTs, the obtained sensor exhibited high sensitivity for tanshinol detection under optimum experimental conditions. The sensor shows two well linear relationship between the current and tanshinol concentration in the range of 0.002–0.69 mM (R 2 = 0.989) and 0.69–3.75 mM (R 2 = 0.994) with the corresponding sensitivity of 59.16 μA mM − 1 and 19.08 μA mM − 1 . And the limit of detection (LOD) was calculated to be 0.019 μM (S/N = 3). Furthermore, with the advantages of good repeatability, stability and selectivity, the fabricated sensor can be successfully applied to measurement of tanshinol in real medicinal liquids samples. Our results would accelerate the applications of MOFs in electrochemical field and provide insights into design of multifunctional non-enzyme sensing materials for various applications in biocatalysis, bioanalysis and drug testing.
研究领域:
材料科学
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生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Shengjie Xia,Yue Meng,Xiaobo Zhou,Jilong Xue,Guoxiang Pan,Zheming Ni
In this paper, Ti/ZnO–Fe 2 O 3 composite derived from Ti/Schiff base intercalated ZnFe layered double hydroxides was used as thin film electrode in CO 2 photoelectroreduction. The influence of molar ratio of Ti/Fe and calcination temperature, which would affect the composites' physicochemical property and the photoelectrocatalytic performance for CO 2 reduction, were investigated in detail. The characterization results from XRD, SEM, TEM, UV-vis and BET showed that Ti/ZnO–Fe 2 O 3 composite with flower–like crystal from had small particle sizes, narrow band gap and excellent textural properties. The final product of CO 2 photoelectroreduction was methanol and the intermediates were formic acid and formaldehyde. The methanol field reached at 0.773 mmol/cm 2 after 3 h reaction with 0.5 V voltage by Ti/ZnO–Fe 2 O 3 composite with Ti/Fe = 1, calcined at 800 °C. In addition, the CO 2 photoelectroreduction pathway and the reason for highly efficient photoelectrocatalytic activity of the composite were also discussed.
研究领域:
材料化学
·
环境催化
·
能源化学
·
纳米材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wenjian Shen,Jing Zhang,Shiyu Wang,Heping Du,Yiwen Tang
Interface passivation layer deposited onto photoanodes has been proven to be an available way to suppress charge recombination and enhance the power conversion efficiency in quantum dot-sensitized solar cells. In this work, the ZnS-MnS composites layers inserted in ZnO/CdS nanotubes photoanodes interface is firstly fabricated via ion-exchange and chemical bath deposition methods, simultaneously. By inserting the ZnS-MnS composites, electron back transfer is efficiently hindered. In addition, the uniform ZnS-MnS layer effectively blocks the direct contact between the polysulfide electrolyte and ZnO nanotubes, which inhabits the recombination of electron-hole pairs occurred at the interface. Besides, the MnS layer is in favour of the CdS quantum dots in higher load, profiting the light absorption intensity in the visible light region. Thus ZnO/ZnS-MnS/CdS nanotubes quantum dot-sensitized solar cells have efficiency of 3.62%, which is much higher than that of the solar cell with ZnS passivation layer (2.33%). This work demonstrates that constructing ZnS-MnS interface passivation layer with a proper band gap structure is a promising approach to enhance the performance of quantum dot-sensitized solar cells.
研究领域:
材料科学
·
纳米技术
·
太阳能
✓ 已验证
DOI
高影响因子
Regenerative Therapy
·
2024
·
IF 3.4
Xun Xu,Jun Wang,Tian-Ci Sun,Qing Li,Ren-De Ning
Hydrogel has emerged as a promising wound dressing material, and in situ forming hydrogel has emerged as a promising wound dressing recently. But most in situ forming hydrogel are normally unstable. Herein, we report an in-situ forming hydrogel synthesized from poly(Nisopropylacrylamide166- co - n -butyl acrylate9)-poly(ethyleneglycol)-poly(N-isopropylacrylamide166- co - n -butyl acrylate9) copolymer (P(NIPAM166- co -nBA9)-PEG-P(NIPAM166-conBA9), denoted as PEP) and zinc oxide nano-particle(ZnO nano-particle) in response to skin temperature. This thermoresponsive hydrogel exhibits sol-gel reversibility at high temperatures, which is closed to the temperature of human skin. To investigate its healing effects, we used the Hydrogel dressing® in an SD rat model. The biocompatibility and antibacterial ability against methicillin-resistant Staphylococcus aureus(MRSA) of this PEP-ZnO hydrogel wound dressing are confirmed in vitro and in vivo, which could transparently promote the healing of a MRSA-infected frostbitten skin Injury. Materials and methods Thirty rats were randomly divided into two groups. The treatment group received hydrogel and transparent film dressing 30 min to 1 h post-burn, while the control group received only cotton dressing. The wound area was measured, and the wound closure rate was calculated on days 3, 7, and 14 post-surgery. Tissue samples were collected from each rat on these days and stored at −80 °C for histological analysis using H&E, Masson and immunohistochemical staining. This analysis assessed factors such as granulation tissue length, re-epithelialization, re-angiogenesis, collagen deposition, inflammatory cell infiltration, and collagen production. Clinical and histological assessments at 14 days showed more rapid healing in the hydrogel dressing group compared to the control group. Conclusion Our results indicate that the design of our hydrogel for cooling injury wounds effectively improves healing and mitigates the damage from low temperatures.
研究领域:
生物材料学
·
微生物学
·
医学工程
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Qi Xue,Tao Hang,Jianghu Liang,Chun-Chao Chen,Yunwen Wu,Huiqin Ling,Ming Li
Memristors have been seen as promising candidates for next-generation nonvolatile memory and neuromorphic computing . Solution-processed memristors can offer many advantages, such as low-cost fabrication, large-area uniformity, and high versatility. However, the high annealing temperature of the solution process and unsatisfactory performance are impeding the advancement of flexible memristors. In this work, the combustion method was proposed to fabricate the Mn-ZnO-based memristor without a high-temperature process on the flexible substrate. The device demonstrates stable bipolar resistive switching behavior with ultralow switching voltage (−0.6 V/0.71 V), high on/off ratio (˃ 2 × 10 3 ), multilevel storage capability, and uniform resistance distribution ( σ / µ = 18%/16%). The flexible device with a bend radius of 10 mm shows no obvious performance degeneration compared with the device in the flat state. Furthermore, tunable repetitively synaptic weight was achieved by the memristor. Synaptic plasticity functions, such as excitatory postsynaptic current, paired-pulse facilitation, and learning/forgetting behaviors, have been emulated. This work provides a simple and feasible strategy for fabricating the flexible high-performance memristor, with the expectation to facilitate the development of flexible electronics.
研究领域:
材料科学
·
纳米科技
·
电子工程
·
神经形态计算
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柔性电子学
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固态物理
·
功能材料
✓ 已验证
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 10
·1232
·
IF 4.146
Beibei Yang,Xuefei Liu,Zixu Ma,Qian Wang,Junjiao Yang
The key to the commercialization of sustainable energy conversion technologies is the development of high-performance catalysts. The discovery of a stable, efficient, and low-cost multi-function catalysts is the key. We used a simple green precipitation method to load nanozinc oxide particles onto a diatomite substrate. The ZnO is nano-sized. This precipitation method produces ZnO nanoparticles in situ on diatomite. The catalysts degraded 90% of Methylene blue solution and also degraded gaseous benzene and gaseous acetone. Not only can the catalysts be used for the organic degradation of wastewater, but it also has the potential to degrade volatile organic compounds. Photocatalytic efficiency is closely related to the generation and separation of photogenerated electrons and holes. The effective suppression of the recombination rate of photoliving carriers and thus improvement of the photocatalytic activity, has become a key research area. At present, photocatalysis is an effective technology to inhibit photogenerated carrier recombination, which is often studied in sewage treatment. Photoelectrochemical decomposition of water reduces the recombination of photogenerated electrons and holes by applying an external bias, thus improving the quantum efficiency for the complete mineralization of organic pollutants. The composite catalysts were used for oxygen and hydrogen extraction reactions, and a comparison of the catalysts with various loading ratios showed that the photoelectrochemical decomposition of water activity of the composite catalysts are due to pure ZnO, and the efficiency is highest when the loading ratio is 10%. This work provides new methods for the design and further optimization of the preparation of photoelectrochemical decomposition of water catalysts.
研究领域:
材料科学
·
环境科学
·
化学
·
能源转换
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiliang Chen,Yaoyu Luo,Chuixiu Huang,Xiantao Shen
Designing a novel type of imprinted photocatalysts for selective photoreduction of highly toxic pollutants is extremely needed in semiconductor photocatalysis. In this work, imprinted photocatalysts (named ZnO/GO-MIPs) were synthesized via Pickering emulsion polymerization by in situ assembling ZnO/GO composites on the synthetic molecular receptors (MIPs). The experimental data showed that the ZnO/GO-MIPs owned specific affinity towards the target Cr(VI) in aqueous solution with an imprinting factor ( IF ) of 1.6. Under the illumination of visible light, the ZnO/GO composites could selectively photoreduce the Cr(VI) adsorbed by the MIPs. In comparison with the ZnO/GO catalysts under light illumination, the ZnO/GO-MIPs showed a 15 fold increase in photoreduction of Cr(VI). Mechanism study indicates the photoreduction of Cr(VI) by the ZnO/GO composites was occurred at the interface between the solid MIP core and the aqueous solution. Compared to the ZnO-MIPs and the GO-MIPs, the ZnO/GO-MIPs clearly showed interfacial synergistic catalysis effect. To the best of our knowledge, this is first time that selective photoreduction of highly toxic pollutants at the solid-water interface by the ZnO/GO-MIPs was achieved. We believe the ZnO/GO-MIP catalysts have great potential in interfacial synergistic catalysis in environment and catalysis fields.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Changlin Li,Yanfang Wang,Shangrong Chen,Wei Zhang,Zi Wang,Zhongyu Hou
The erosion issue of ZnO nanorod arrays (NRAs) film is the major obstacle in surface sensitization of ZnO NRAs grown on Zn foil substrate for photoelectrochemical (PEC) applications. In this paper, PEC performance of ZnO NRAs grown on Zn foil substrate was greatly enhanced by coating ZnSe and CdSe on the surface of ZnO NRAs. Dense ZnO NRAs were in - situ grown on seed-free Zn foil substrate in a NH 3 ·H 2 O and NaOH hydrothermal system. ZnSe/CdSe co-sensitized ZnO heterostructures were then successfully synthesized using ZnO NRAs as precursors by two successive in - situ ion exchanges without damaging Zn foil and ZnO NRAs film. To obtain optimal photoconversion efficiency, anion exchange time and temperature were optimized. ZnO/ZnSe/CdSe heterostructures with optimized structure were shown as a layer of compact ZnSe/CdSe nanofilm conformally and uniformly coated on ZnO NRAs, which leads to efficient separation of photogenerated carriers , significant enhancement in visible-light absorption, and excellent PEC performance with photocurrent density of 3.008 mA/cm 2 (−0.2 V vs . Ag/AgCl) and photoconversion efficiency of 1.99% (0.418 V vs . RHE in polysulfide electrolyte solution), 27.55 and 40.61 times higher than those of ZnO NRAs, respectively.
研究领域:
材料科学
·
光电化学
·
纳米技术
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）