APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Juan Wang,Guohong Wang,Xianhong Wei,Guo Liu,Jun Li
A ZnO/TiO 2 heterojunction photocatalyst based on ZnO nanoparticles embedded in the hierarchically structured TiO 2 framework containing parallel macroporous channels and thin mesoporous walls has been synthesized by a common calcination treatment using zinc chloride and tetrabutyl titanate as the raw materials. The materials properties of the ZnO/TiO 2 heterojunction photocatalysts have been carefully characterized with SEM/TEM, XRD, FTIR, XPS, BET analyses, UV–Vis absorption and photoluminescence spectroscopy. The photocatalytic performance for decomposition of Rhodamine B (RhB) under UV light irradiation has been systematically investigated in correlation with the materials structures. The apparent RhB degradation rate constant ( k ) has been determined to be 20.7 × 10 −3 min −1 for the optimal hybrid photocatalyst with 5 wt% of ZnO loading, significantly higher that of pure TiO 2 (12.2 × 10 −3 min −1 ) and pure ZnO nanoparticles (5.7 × 10 −3 min −1 ), respectively. Active species trapping experiments reveal that •OH and •O 2 − play the major roles in the photocatalytic reactions. The enhanced performance can be ascribed to the formation of a direct Z-scheme heterojunction structure between ZnO and TiO 2 in contrast to the usual type-II heterojunction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiang Cai,Tao Yuan,Xiangfu Liu,Guoli Tu
Solid alcohol 1-pyrenemethanol (PyM) was first introduced to modify the zinc oxide (ZnO) layer which is used in the inverted polymer solar cells (PSCs) as a cathode buffer layer (CBL). As a low-cost industrial product, the PyM can modify the surface defects and improve the electron mobility of ZnO CBL, which can be attributed to the self-assembly of PyM on the ZnO surface due to the hydrogen bonds and the conjugated structure in PyM. With a blend of PTB7:PC71BM as active layer, the device with ZnO/PyM CBL exhibited a notable power conversion efficiency (PCE) of 8.26%, which is better than that of control devices based on bare ZnO CBL (7.26%). With the addition of PyM, the device based on PTB7-Th:PC71BM showed a higher PCE of 9.10%, an obvious improvement from the 7.79% of control devices. There was no obvious change in device performance with the increase of PyM solution concentration, indicating that the device fabrications are thickness-insensitive. These results could be particularly useful in solution processing of buffer layer materials to high-efficiency organic solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 26
·17041-17052
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IF 4.493
Xiangyang Liu,Xiuying Cheng,Shun Wang,Kun Zhang,Yuzong Gu
ZnO films with several microstructures including nanoparticles, nanowire arrays, nanorod arrays and nanotube arrays were prepared using different methods. In2O3 and/or Cu4Bi4S9 were deposited onto each nanostructured ZnO film, and two types of heterostructures (ZnO/Cu4Bi4S9 and ZnO/In2O3/Cu4Bi4S9) as well as solid state dye-sensitized solar cells were fabricated. The signals of steady state and electric field-induced surface photovoltage spectroscopy indicate that all of ZnO/In2O3/Cu4Bi4S9 heterostructures exhibit higher photovoltaic response than the relative ZnO/Cu4Bi4S9. The same type of heterostructure with different ZnO films presents various photovoltaic properties. Transient surface photovoltage spectroscopy can contribute to study the separation and transport mechanism of photogenerated charges. Here, ZnO nanotubes/Cu4Bi4S9 and ZnO nanotubes/In2O3/Cu4Bi4S9 cells exhibit the best performances with the highest efficiencies of 6.2% and 6.8%, respectively. The internal relations of photoelectric properties to some factors, such as film thickness, surface area, microstructure, double energy level matchings, etc. were discussed in detail. Qualitative and quantitative analysis further verified the comprehensive effect and the difference of factors. The exploration to understand the transport mechanism of light-induced charges in composite films will promote the nanocrystal application in solid state solar cells and photovoltaic community.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 13
·5571-5579
·
IF 0
Longcheng Xu,Jianming Pan,Jiangdong Dai,Zhijing Cao,Hui Hang,Xiuxiu Li,Yongsheng Yan
This paper reports a molecularly imprinted polymers (MIPs) based fluorescence sensor which is synthesized by grafting MIP layers on the surface of ZnO nanorods embedded γ-Fe2O3 nanoparticles via activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP). Methacrylic acid (MAA, functional monomer), 3-(trimethoxysilyl)propyl mathacrylate (MPS) modified γ-Fe2O3 (γ-Fe2O3/MPS, assistant magnetic monomer) and ethylene glycol dimethacrylate (EGDMA, cross-linking monomer) were co-polymerized in anisole at 313 K in the presence of sulfamethazine as a template molecule. Sulfamethazine was then solvent-extracted to obtain ZnO-grafted molecularly imprinted polymers (ZnO-MIPs). ZnO-MIPs were characterized by FE-SEM, TEM, FT-IR, TGA/DSC, VSM, fluorescence spectroscopy and Raman spectroscopy. It was observed that sulfamethazine can quench the luminescence of ZnO-MIPs in a concentration-dependent manner that can be described by a Stern–Volmer-type equation. ZnO-MIPs were used to determine sulfamethazine in a spiked pork sample with good recognition ability. This study therefore demonstrates the potential application in the recognition and separation of antibiotics based on molecularly imprinted polymers.
研究领域:
材料科学
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分析化学
·
生物医学工程
✓ 已验证
DOI
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 27
·275712
·
IF 3.953
Yangchun Feng,Wangyang Yang,Yufang Li,Honglie Shen
In recent years, high-performance acetone gas sensors have attracted great attention for their potential in noninvasive blood glucose monitoring. In this work, black TiO2 (B-TiO2) was introduced as an electron trapping layer between TiO2 and ZnO to form TiO2@B-TiO2@ZnO core–shell nanoparticles, through a simple and safe method. The acetone sensing performance of TiO2@B-TiO2@ZnO varied with the thickness of ZnO. Because of the electron trapping effect of the introduced B-TiO2 layer, the best performing sample exhibited a low optimal operating temperature of 275 °C and a high response of 49.25–50 ppm acetone. In addition, a low detection limit of 170 ppb was obtained. The pretty selectivity of the sample was also been proved. The mechanism of enhanced acetone response was explained by the energy band-based model of TiO2@B-TiO2@ZnO core–shell nanoparticle and depletion layer theory.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Zhen Wang,Luyao Ding,Shenglong Yu,Huan Xu,Xiaohui Hao,Yi Sun,Tianmin He
A comparative study has been made to relate the effect of different addition strategies for the sintering aid of ZnO (∼1 wt %) on the performance of the BaZr0.4Ce0.4Y0.2O3−δ (BZCY442) electrolyte in order to improve the sinterability and conductivity of this material more efficiently. Two samples, Zn-doped BaCe0.4Zr0.4Y0.15Zn0.05O3−δ (BZCYZn, internal doping) and BZCY–ZnO (BZCY442 mixed with ZnO, external addition), were synthesized. The BZCYZn crystallized at a single phase after sintering at 1350 °C, and the segregation of Y2O3 was observed in BZCY–ZnO in the same conditions. The relative densities of the BZCYZn and BZCY–ZnO samples sintered at 1350 °C for 5 h were 98 and 94%, respectively. The high total conductivity in BZCYZn benefited from the low barrier height at the grain boundary core determined by the Mott–Schottky space charge layer model, which was 0.15 V for BZCYZn and 0.26 V for BZCY–ZnO. A cell with BZCYZn as the electrolyte generated a power density of 414.5 mW cm–2 at 700 °C. The total ionic transport number of BZCYZn was determined to be ∼0.90 at 600 °C under fuel cell conditions.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Crystals
·
2020
·Vol. 10
·期 4
·325
·
IF 2.404
Liqing Liu,Hui Wang,Dehao Wang,Yongtao Li,Xuemin He,Hongguang Zhang,Jianping Shen
The ZnO@TiO2core/shell nanowire arrays with different thicknesses of the TiO2shell were synthesized, through depositing TiO2on the ZnO nanowire arrays using the pulsed laser deposition process. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that these core/shell nanowires were homogeneously coated with TiO2nanoparticles with high crystallinity, appearing to be a rather rough surface compared to pure ZnO nanowires. The efficiency of ZnO@TiO2core/shell structure-based dye-sensitized solar cells (DSSCs) was improved compared with pure ZnO nanowires. This is mainly attributed to the enlarged internal surface area of the core/shell structures, which increases dye adsorption on the anode to improve the light harvest. In addition, the energy barrier which formed at the interface between ZnO and TiO2promoted the charge separation and suppressed the carrier recombination. Furthermore, the efficiency of DSSCs was further improved by increasing the thickness of the TiO2shell. This work shows an efficient method to achieve high power conversion efficiency in core/shell nanowire-based DSSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2012
·
IF 4.525
Wei Wu,Shaofeng Zhang,Xiangheng Xiao,Juan Zhou,Feng Ren,Lingling Sun,Changzhong Jiang
Mesoporous spindlelike iron oxide/ZnO core–shell heterostructures are successfully fabricated by a low-cost, surfactant-free, and environmentally friendly seed-mediate strategy with the help of postannealing treatment. The material composition and stoichiometry, as well as these magnetic and optical properties, have been examined and verified by means of high-resolution transmission electron microscopy and X-ray diffraction, the thickness of ZnO layer can be simply tailored by the concentration of zinc precursor. Considering that both α-Fe2O3 and ZnO are good photocatalytic materials, we have investigated the photodegradation performances of the core–shell heterostructures using organic dyes Rhodamin B (RhB). It is interesting to find that the as-obtained iron oxides/ZnO core–shell heterostructures exhibited enhanced visible light or UV photocatalytic abilities, remarkably superior to the as-used α-Fe2O3 seeds and commercial TiO2 products (P25), mainly owing to the synergistic effect between the narrow and wide bandgap semiconductors and effective electron–hole separation at the interfaces of iron oxides/ZnO.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2022
·Vol. 6
·期 11
·2200336
·
IF 9.173
Jian Song,Yifan Ren,Shijie Gong,Liang Zhao,Wufan Xuan,Lei Zhu,Yulong Zhao,Yinghuai Qiang,Lili Gao,Sheng Huang
Crystal silicon solar cells being the most successful photovoltaic devices have prevailed in the energy market for decades. To further improve the device performance, photon management is necessary. Herein, a CsPbBr 3 –Cs 4 PbBr 6 perovskite quantum dot@ZnO/ethylene vinyl acetate copolymer downshifting composite film is coated on the silicon solar cell. This downshifting composite film helps to convert high-energy (UV-blue) photons to relatively low-energy photons with a wavelength at about 500 nm, which possess higher sensitivity in silicon solar cells. The effects of tetra- n -heptylammonium bromide and Zn(C 2 H 5 ) 2 on composition, optical and luminescence properties of perovskite quantum dots are thoroughly investigated, and a clean quantum dot solution with strong luminescent intensity can be obtained. The perovskite quantum dot@ZnO/ethylene vinyl acetate composite film absolutely improves the efficiency of silicon solar cells by 1.18%. The value is much higher than pure ethylene vinyl acetate (0.42%) and composite film without ZnO (0.57%). Moreover, ZnO inclusion can inhibit Cs and Pb leakage and maintain the device working stability, which is helpful for their commercial application in the future. This study further reveals that the enhancement lies in carrier relaxation energy loss reduction. Herein, a low-cost downshifting composite film with excellent environmental stability for silicon solar cells applications is proposed.
研究领域:
材料科学
·
能源技术
·
光伏领域
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Huilin Hou,Huabing Liu,Fengmei Gao,Minghui Shang,Lin Wang,Linli Xu,Wai-Yeung Wong,Weiyou Yang
Constructing semiconductor heterojunction with optimal structure and composition is highly desired to maximize the solar light utilization for photoelectrochemical (PEC) water splitting. Here, we reported the fabrication of BiVO 4 @ZnO heterojunction with a novel nanostructure for PEC water splitting via foaming-assisted electrospinning and subsequent atomic layer deposition (ALD) techniques. In such BiVO 4 @ZnO heterojunction , the isolated BiVO 4 nanoparticles were packaged within the ZnO microbelt matrix. During PEC water splitting, the BiVO 4 acts as the primary light absorber for wider solar spectral harvesting, and the ZnO prompts the transfer of the photo-excited high-energy electrons, which would render them with prolonged lifetime and enhanced separation of the photogenerated charge carriers. In addition, the microbelts architecture with a hollow channel can also effectively improve the interfacial charge separation and transportation. Accordingly, the PEC performances of BiVO 4 @ZnO hybrid microbelts were significantly enhanced with a photocurrent density up to ∼0.46 mA cm −2 (at 1.23 V vs. reversible hydrogen electrode (RHE) under simulated sunlight illumination), which is 15.3 times to that of pure BiVO 4 counterpart (∼0.03 mA cm −2 ). The photocurrent density of the BiVO 4 @ZnO electrode can be further increased to 1.07 mA cm −2 at 1.2 V vs. RHE by adding hole scavenger (NaSO 3 ) in the electrolyte solution under AM 1.5 G irradiation.
研究领域:
材料科学
·
纳米技术
·
可再生能源
·
电化学
·
半导体物理
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 4
·2289-2304
·
IF 6.123
Shi Chun,Zhang Lili,Shi Zhengjun,Zai Zhenqiang,Ma Jinxia,Wang Zhiguo
Ag–ZnO/cellulose nanocomposites with an all-weather photocatalytic performance that responds to all light conditions (including ultraviolet light, visible light, and even darkness) were fabricated by adjusting the surface groups and aspect ratios of the cellulose nanofiber substrate. The cellulose nanofibers improved the dispersibility and photostability of the Ag–ZnO nanoparticles (NPs), thereby enhancing the photocatalytic activity. The morphologies and sizes of the ZnO and Ag NPs within the Ag–ZnO/cellulose nanocomposites were controlled by using cellulose nanofibers with different surface groups and aspect ratios. ZnO NPs with average diameters of 250, 500, and 100 nm were synthesized in situ using cellulose nanocrystals (CNCs), cellulose nanofibrils (CNFs), and TEMPO-mediated oxidized cellulose nanofibrils (TOCNFs), respectively. The Ag–ZnO/TOCNF nanocomposites exhibited excellent all-weather photocatalytic performance, high loading amounts, and large effective contact area with pollutants. Free radical trapping experiments demonstrated that ·OH had the most significant effect on the photocatalytic activity. The photocatalytic activity of the Ag–ZnO/TOCNF nanocomposites was improved by preventing the recombination of electrons and holes and increasing the contact area with pollutants and light. The photogenerated electrons stored on the surface of the ZnO NPs and Ag NPs were further used for reducing H 2 O 2 to generate ·OH free radicals in the dark, which continued to catalyze the degradation of pollutants without light irradiation. Moreover, the photocatalytic degradation of methyl orange to CO 2 and H 2 O was confirmed via a catalytic mechanism and liquid chromatography–mass spectrometry.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 34
·期 10
·105707
·
IF 3.953
Xiangrui Bu,Qiang Wu,Yubin Yuan,Haiyang Wu,Weihua Liu,Xin Li,Chuanyu Han
Ethanol is a harmful volatile organic compound (VOC) for human health. Currently, zinc oxide (ZnO) is one of the most popular metal oxide semiconductors for VOCs detection but suffering from a lack of selectivity, poor response, and slow response/recovery speeds. Herein, we successfully synthesized the ZnO/Ti3C2Tx nanocomposites via a facile hydrothermal method, in which ZnO nanoparticles were uniformly grown on two-dimensional (2D) Ti3C2Tx nanosheets. As a result, the ZnO/Ti3C2Tx nanocomposites showed a significant improvement in the ethanol-sensing performance, when it compared to the pure ZnO and Ti3C2Tx samples. In particular, ZnO doped with 5 mg of Ti3C2Tx showed an ultra-high response (79) to 100 ppm ethanol, a short response/recovery time (22 s/34 s to 50 ppm ethanol), a low limit of detection (1 ppm) and a long-term stability. The excellent ethanol sensing properties are mainly attributed to the coupling effect between ZnO and Ti3C2Tx of composites. The ZnO nanoparticles are uniformly distributed on the 2D Ti3C2Tx platform, which can provide more gas adsorption sites. Simultaneously, the presence of hybrid heterojunctions further enhances the response in the sensing process.
研究领域:
材料科学
·
传感技术
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）