NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 19
·16329-16334
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IF 3.201
Jian Cheng,Junhong Ma,Yuhua Ma,Cui Zhou,Yue Qiang,Xiaofeng Zhou,Jianya Yang,Haokun Shi,Yahong Xie
Dye-sensitized solar cells (DSSCs) have many advantages, but the use of expensive platinum counter electrodes (CEs) limits their industrial applications. In this work, a Co–Ni/carbon aerogel composite with a unique three-dimensional network structure and high specific surface area was prepared through simple ion exchange and carbonization of low-cost sodium alginate supramolecular hydrogels. Using this metal/carbon aerogel composite as the CE (hereafter denoted as CAE) of ZnO-based DSSCs, a photoelectric conversion efficiency (PCE) of 5.08% was obtained. This value was 94.44% of the PCE obtained using Pt. Analysis of current–voltage curves, cyclic voltammograms, and electrochemical impedance spectra revealed that the fabricated CAE had higher catalytic activity than a Pt CE and comparable charge-transfer ability. The adhesion of the CAE onto FTO was also strong with carbon paste as an adhesive.
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Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 2
·600-607
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IF 0
Hanxing Chen,Ming Wen,Zaidi Huang,Qingsheng Wu,Jiali Liu,Teng Tu
Highly active Cu@ZnO brush-like nanostructures have been successfully synthesized through the heteroepitaxial growth process of ZnO branched nanorods (NRs) based on Cu core nanowires (NWs), and used for the evaluation of selective catalytic degradation for polycyclic aromatic compounds. The resultant Cu@ZnO nanobrushes, with the main diameter of ∼500 nm, consist of Cu core NWs with diameter of ∼50 nm and outer ZnO branch NRs shells with thickness of ∼250 nm. The as-designed Cu@ZnO nanobrushes exhibit high performance for the selective catalytic degradation of polycyclic aromatic compounds. Nearly 90% conversion with the reaction rate constant (k) of 0.012 min−1 can be achieved for anthracene, while only about 50% and 10% conversions are shown for phenanthrene and naphthalene, respectively. Besides the highly efficient transportation of electrons, Cu NWs have strong capacity for oxygen activation which results in the gathering of negative charges and rich chemisorbed oxygen onto the surface, which is responsible for the high catalytic efficiency of Cu@ZnO nanobrushes toward the selective degradation of anthracene.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 22
·期 4
·2891-2899
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IF 2.757
Luo Zhuanxi,Qiu Zhaozheng,Chen Zheng,Du Laing Gijs,Liu Aifen,Yan Changzhou
Increased application of titanium dioxide and zinc oxide nanoparticles (nano-TiO 2 and nano-ZnO) raises concerns related to their environmental impacts. The effects that such nanoparticles have on environmental processes and the bacteria that carry them out are largely unknown. In this study, ammonia-oxidizing bacteria (AOB) enrichment cultures, grown from surface sediments taken from an estuary wetland in Fujian Province, China, were spiked with nano-TiO 2 and nano-ZnO (with an average size of 32 and 43 nm, respectively) at predicted environmentally relevant concentrations (≤2 mg L −1 ) to determine their impacts on ammonia oxidation and the mechanisms involved. Results showed that higher nano-TiO 2 concentrations significantly inhibited ammonia oxidation in enrichment cultures. It is noteworthy that the average ammonia oxidation rate was significantly correlated to the Shannon index, the Simpson’s index, and AOB abundance. This suggested that ammonia oxidation inhibition primarily resulted from a reduction of AOB biodiversity and abundance. However, AOB biodiversity and abundance as well as the average ammonia oxidation rate were not inhibited by nano-ZnO at predicted environmentally relevant concentrations. Accordingly, an insignificant correlation was established between biodiversity and abundance of the AOB amoA gene and the average ammonia oxidation rate under nano-ZnO treatments. AOB present in samples belonged to the β- Proteobacteria class with an affinity close to Nitrosospira and Nitrosomonas genera. This suggested that identified impacts of nano-TiO 2 and nano-ZnO on ammonia oxidation processes can be extrapolated to some extent to natural aquatic environments. Complex impacts on AOB may result from different nanomaterials present in aquatic environments at various ambient conditions. Further investigation on how and to what extent different nanomaterials influence AOB diversity and abundance and their subsequent ammonia oxidation processes is therefore required.
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PubMed
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RSC Advances
·
2015
·Vol. 5
·期 55
·44088-44095
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IF 3.84
Xiao Wei,Zhiping Zhou,Tongfan Hao,Hongji Li,Yanzhuo Zhu,Lin Gao,Yongsheng Yan
Inspired by a surface imprinting-directing polymerization system, an effective and simple synthesis method was first developed to prepare an imprinted polymer thin film at the surface of ZnO nanorods (ZnO NRs), and the composites were used as fluorescence sensors for sensitively and selectively recognizing the target para-nitrophenol (4-NP). The vinyl-modified ZnO NRs were used as the solid supports and optical materials. The obtained materials (MIPs-ZnO NRs), which were composed of ZnO NRs as fluorescence signal and MIPs as molecular selective recognition sites, could sensitively and selectively recognize the template molecules by using the spectrofluorometer. After the experimental conditions were optimized, a linear relationship was obtained covering the linear range of 0.5–14 μmol L−1 with a correlation coefficient of 0.9981. The developed method was applicable to routine trace determination of 4-NP in the spiked river water samples. This study provides a general strategy to fabricate imprinted polymer thin films-coated ZnO NRs with excellent performance for sensor application.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Lu Lin,Haiou Liu,Xiongfu Zhang
MOFs-based yolk-shell composites are newly-presented but promising catalysts in the area of catalysis. In this work, a kind of unique rattle-type Pd/ZnO@hollow ZIF-8 yolk-shell catalyst is developed via a ZnO-template approach, in which there exist two processes of both ZnO-induced ZIF-8 formation and ZnO dissolution. Of prime importance is that ZnO was selected as the sacrificial template since it can not only be etched in the solution of ligands but also assist the formation of compact ZIF-8 shell by providing nucleation sites via linker activation. It is also proposed that sufficient amount of Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole added in the growth solution of ZIF-8 should accelerate the outward growth of ZIF-8 layer as well as dissolution of ZnO. This way, the final construction of Pd/ZnO@hollow ZIF-8 yolk-shell materials is achieved. Compared to the Pd/ZnO counterparts, Pd/ZnO@hollow ZIF-8 rattle-type catalysts demonstrate a promoted behavior in terms of size-selectivity for the liquid hydrogenations of alkenes due to the outer ZIF-8 shell acting as a molecular sieve. It can also protect the catalytically active Pd NPs from poisoning and leaching, giving rise to an excellent stability. Moreover, the yolk-shell catalysts manifest a better activity beyond their core-shell counterparts since the presented interior hollow space between core and shell is likely to expose more active surfaces to reactants.
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Nano Research
·
2016
·Vol. 9
·期 8
·2270-2283
·
IF 8.893
Wang Shuguang,Cui Zhentao,Qin Jinwen,Cao Minhua
Rational design and simple synthesis of one-dimensional nanofibers with high specific surface areas and hierarchically porous structures are still challenging. In the present work, a novel strategy utilizing a thermally removable template was developed to synthesize hierarchically porous N-doped carbon nanofibers (HP-NCNFs) through the use of simple electrospinning technology coupled with subsequent pyrolysis. During the pyrolysis process, ZnO nanoparticles can be formed in situ and act as a thermally removable template due to their decomposition and sublimation under high-temperature conditions. The resulting HP-NCNFs have lengths of up to hundreds of micrometers with an average diameter of 300 nm and possess a hierarchically porous structure throughout. Such unique structures endow HP-NCNFs with a high specific surface area of up to 829.5 m 2 ·g –1 , which is 2.6 times higher than that (323.2 m 2 ·g –1 ) of conventional N-doped carbon nanofibers (NCNFs). Compared with conventional NCNFs, the HP-NCNF catalyst exhibited greatly enhanced catalytic performance and improved kinetics for the oxygen reduction reaction (ORR) in alkaline media. Moreover, the HP-NCNFs even showed better stability and stronger methanol crossover effect tolerance than the commercial Pt-C catalyst. The optimized ORR performance can be attributed to the synergetic contribution of continuous and three-dimensional (3D) cross-linked structures, graphene-like structure on the edge of the HP-NCNFs, high specific surface area, and a hierarchically porous structure.
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RSC Advances
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2017
·Vol. 7
·期 50
·31365-31371
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IF 3.108
Rong-Mei Kong,Yan Zhao,Yiqun Zheng,Fengli Qu
Zeolitic imidazolate frameworks (ZIF) are attracting considerable attention for their applications in adsorbents/separation as well as catalysis. In this article, we proposed a simple strategy to fabricate semiconductor–ZIF core–shell nanocomposites, which exhibited remarkable coherent function for adsorption and photocatalytic degradation of organic pollutants. The current nanocomposites were composed of ZnO/CdS and ZIF-8, where spindle-like ZnO nanoparticles not only acted as the seeding material but also worked as the Zn2+ source for the formation of ZIF-8. The as-prepared ZnO/CdS@ZIF-8 core–shell nanocomposites displayed distinct photocatalytic activity for methylene blue (MB) and rhodamine B (RhB) owing to the unique pore structure and thus absorption effect of the ZIF-8 shell. To this end, the ZnO/CdS@ZIF-8 core–shell nanocomposites could find important applications in photocatalytic degradation of pollutants.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Innocent O. Arukalam,Emeka E. Oguzie,Ying Li
Perfluorodecyltrichlorosilane-based poly(dimethylsiloxane)-ZnO (FDTS-based PDMS-ZnO) nanocomposite coating with anti-corrosion and anti-fouling capabilities has been prepared using a one-step fabrication technique. XPS analysis and contact angle measurements showed the fluorine content to increase, while the hydrophobicity of the coatings decreased with addition of FDTS. XRD analysis revealed existence of ZnO nanoparticles of dimensions ranging from 11.45 to 93.01 nm on the surface of coatings, with the mean particle size decreasing with FDTS addition, and was confirmed by SEM and TEM observations. Interestingly, the anti-corrosion performance and mechanical properties of the coatings increased remarkably on addition of FDTS. Indeed, the observed low adhesion strength , surface energies and the outstanding anti-corrosive properties imply that the obtained coating would be useful in anti-fouling applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Jinghu Zhang,Sugang Meng,Xiangju Ye,Cancan Ling,Sujuan Zhang,Xianliang Fu,Shifu Chen
Selective oxidation of aromatic alcohols to corresponding carbonyl compounds under mild conditions has a promising prospect in industry. In the paper, we successfully prepared a new mode of photothermocatalyst, Zn 3 In 2 S 6 @ZnO composite, which shows dramatically enhanced activity for selective oxidation of benzyl alcohol to benzaldehyde compared with single Zn 3 In 2 S 6 and ZnO under visible light illumination. The enhancement is due to a synergistic effect of low-temperature thermocatalysis on ZnO and photocatalysis on Zn 3 In 2 S 6 . ZnO could weaken bonds of the C H α and the O H. Then the reactive species ( O 2 − and h + ) generated on Zn 3 In 2 S 6 could be easy for selective oxidation of benzyl alcohol to produce benzaldehyde. The photoelectrochemical and photoluminescence (PL) results and a series of control experiments (e.g. reaction temperature and radical scavenger) prove this synergistic effect and proposed mechanism. Moreover, the stable performance and high activity of Zn 3 In 2 S 6 @ZnO for other aromatic alcohols indicate its applicable potential. This study provides a promising way to combine photocatalysis and thermocatalysis for the design of novel and efficient visible-light-driven catalyst for selective oxidation of aromatic alcohols or other organics under mild reaction conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Bo Huang,Hsueh-Liang Chu,Moo-Chin Wang,Cheng-Li Wang,Weng-Sing Hwang,Chao Liu,Horng-Huey Ko,Xiujian Zhao
Crystallization kinetics evaluated by the modified formula and optical properties of CdO and ZnO in 0.5ZnO-0.5CdO thin films have been investigated. The characterization used grazing incidence X-ray diffraction (GIXRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), high-resolution TEM (HRTEM) and ultraviolet–visible (UV–Vis) spectrophotometry. When the thin films are annealed at temperatures from 573 K to 773 K for 10–60 min, the GIXRD results show that all the films are composed of CdO and ZnO as major and second phases, respectively. In addition, a trace phase of CdSiO 3 appeared for thin films annealed at 723 K and 773 K for 45 and 60 min, respectively, while CdSiO 3 also appeared when annealing at 773 K for 30 min. The crystallinity of CdO increases with annealing temperature and duration, whereas the crystallinity of ZnO increases only slightly with temperature and duration. The activation energies of ZnO and CdO crystallization in 0.5ZnO-0.5CdO thin films are 49.51 kJ/mol and 112.45 kJ/mol, respectively. The crystallization of CdO and ZnO can be described by a modified formula: ln ( 1 1 − α ′ ) = [ 30 t × exp ( − 49.51 × 10 3 R T ) ] 0.24 and ln ( 1 1 − α ′ ) = [ 104820 t × exp ( − 112.45 × 10 3 R T ) ] 0.27 , for 573 K ≤ T ≤ 773 K and 10 min ≤ t ≤ 60 min, respectively. All films have an average optical transparency of nearly 80% in the wavelength range greater than 500 nm in the visible range, and the band gap energy of the thin films increases from 2.68 eV to 3.10 eV as the crystallinity of ZnO increases from 5.12% to 20.91% when the thin films are annealed for 60 min at 573 K–773 K and shows a blueshift effect.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Mengdie Yang,Jiabao Zuo,Yanan Pan,Gaifang Lv,Qi Yang,Yang Fan,Fan Qiu,Shupeng Zhang
In this work, a novel flexible electrochemical sensor was successfully developed for the simultaneous determination of p-aminophenol and acetaminophen. The sensor is composed of a methanesulfonic acid-treated poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonic acid) film on a poly(ethylene terephthalate) substrate, which has been modified using a zinc oxide-doped tin oxide heterojunction applied through drop-coating (C-ZnO/SnO 2 -PEDOT/PET). The oxygen vacancies resulting from zinc oxide-doped tin oxide heterojunctions within highly conductive metal oxide nanomaterials enhance mass transfer and synergize seamlessly with methanesulfonic acid-treated electrically conductive dielectric PEDOT/PET films, leading to a substantial improvement in electrochemical activity. Under the optimal conditions, a wider linear range and lower detection limits were shown for p-aminophenol (2–511 μM, LOD=0.437 μM) and acetaminophen (2–591 μM, LOD=0.562 μM). In addition, the sensors demonstrated high accuracy in detecting p-aminophenol and acetaminophen in real samples, with recoveries of 99.36 %-99.60 % and 97.56 %-99.80 %, respectively. Furthermore, the flexible sensors maintained a superior electrochemical response when detecting p-aminophenol and acetaminophen at different bending angles, with relative standard deviations of 0.62 % and 1.68 %, respectively. These findings suggest potential applications for the development of wearable sensors in the future.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Yanhu Li,Mei Chen,Linghong Xue,Xu Li,Qingji Wang
Metal oxide semiconductor (MOS) sensor, one of the most widely used gas sensors, faces significant challenges in achieving lower detection limit. Addressing this issue, the utilization and strategic design of bimetallic catalysts present a promising avenue. In this paper, Pd-Pt was in-situ grown on ZnO nanoflowers directly prepared on planar substrate and a sensor for detecting acetone was developed. The test results reveal that the Pd-Pt/ZnO nanoflowers sensor exhibits a remarkable 107.6 response to 100 ppm acetone at 350 °C, while presenting a rapid response (15s). Moreover, this sensor demonstrates excellent capability in detecting acetone at concentrations as low as 1 ppb, showcasing impressive gas-sensing performance. The response of the sensor to 100 ppm acetone is twice that of ethanol at the same concentration. The exceptional performance of the sensor results from its distinctive nanoflower structure and the catalytic effect of the Pd-Pt, which offers an extensive surface area and enhances the rate of redox reaction for gas molecules. This in-situ grown method has great potential for improving the gas-sensing performance in gas sensor.
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