JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 17
·13956-13967
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IF 2.779
Sun Haibo,Zhou Guohua,Guo Zhili,Wang Ce,Wang Jinghui,Zong Changbao
The high-quality TiO 2 insulating layer on the commercial gas-atomized FeSiAl powder surface was efficiently prepared within a total time of 1 h at room temperature via a one-pot sol–gel method based on a developed industry-oriented coating equipment. The core-shell structure for the chemically coated FeSiAl powders was detected by the joint tools of SEM, EDS, and FTIR. Combined with the establishment of loss separation fitting model, the regulation mechanism analysis on soft magnetic properties was carried out for the FeSiAl powder cores insulated with different TiO 2 coating amounts. It is found that the interface-pinning effect, which is closely related to the core’s density, is an important factor affecting the magnetic properties of powder cores. With the elevating TiO 2 coating amount, the hysteresis loss, the excess loss, and DC-bias property of the core specimen exhibit the same increasing tendency, while the real part of complex permeability at 100 kHz gradually decreases owing to the increase of non-magnetic gap between the particles in the core, which can impede the domain-wall motion during magnetization. Correspondingly, the eddy current loss persistently decreases and contributes only 18.7% ~ 21.6% of total core loss when the precursor concentration is over 0.08 ml/g due to the formation of the intergranular insulated structure blocking the inter-particle eddy current flows in the composites. These results offer insights into subtly regulating magnetic properties when the adjusting process parameters for the soft magnetic composites are used in high-power and high-frequency applications.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 17
·4837-4847
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IF 4.478
Lv Xiaoyi,Hu Qiong,Miao Tian,Li YanPing,Cui Bo,Fang Yishan
Herein, we fabricated a label-free ECL immunosensor for aflatoxin B 1 (AFB 1 ) detection. In this system, a small organic aggregation-induced electrochemiluminescence luminophore, 2,5-di-tetraphenylethylene-ylthiazolo [5,4-d] thiazole, was designed, named TPETTZ. Polyaniline-wrapped TiO 2 nanoparticles (PANI/TiO 2 NPs) complex was synthesized through one-step in situ oxidation polymerization of aniline, and performed excellent electrical conductivity and abundant amino groups. As an ECL accelerator, TiO 2 nanoparticles (TiO 2 NPs) promoted the oxidation of tri- n -propylamine (TPA) to generate more TPA • ; in addition, it also acted as a donor to improve the ECL intensity of TPETTZ (acceptor) through electrochemiluminescence resonance energy transfer (ECL-RET). Encouraged by the above, under the existence of TPA, TPETTZ displayed a strong and continuously stable ECL anode signal due to the introduction of PANI/TiO 2 NPs. Therefore, the immunosensor was constructed for AFB 1 detection based on the quenching effect of target on the ECL signal, and a linearly decreasing ECL signal was obtained as the increasement of AFB 1 in the range of 75 fg/mL to 100 ng/mL, with a lower detection limit of 27.5 fg/mL. Moreover, the as-prepared sensing platform performed a satisfactory anti-interference, stability, and reproducibility, and appeared a good accuracy in walnut sample analysis, presenting a promising application in the future.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Feng Long,Xincheng Cao,Xia Jiang,Peng Liu,JianChun Jiang,Xiaolei Zhang,Junming Xu
Catalyst design is critical for renewable selective hydrogenation of fatty acids into alkanes or alcohols, especially for active metals and supports. We demonstrate that NiCu anchored on a TiO2 (P25) surface, prepared by the impregnation method, performed superior temperature-sensitive catalytic activities with a higher fatty alcohol yield of 78.2% (205 °C, 4 MPa H2, and 12 h) and alkane yield of 85.0% (245 °C, 3 MPa H2, and 6 h). X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) suggest that Ni or NiCu anchored on rutile with oxygen vacancies can achieve reversal of charge transfer between the metal and TiO2 support. Especially, the normal NiCu cluster loading on the rutile surface can improve the dispersion of the NiCu cluster and oxygen vacancy concentration. Thus, more NiCu clusters anchored on oxygen defects can obtain negative charges in favor of alcohol production. In contrast, the other active NiCu clusters will preferentially cleave the C–C bond to produce alkanes at a higher reaction temperature. Our work provides a new strategy for designing highly effective hydrogenation catalysts.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 5
·1829-1839
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IF 4.478
Yi Jinquan,Chen Xiaoping,Lin Jianwei,Song Kai,Han Zhizhong,Chen Jinghua
In this work, we designed new dual-mode “turn-on” electrochemical (EC) and photoelectrochemical (PEC) sensors for the detection of dopamine (DA) based on 0D/2D/2D CuInS 2 /ZnS quantum dot (QD)–black phosphorous nanosheet (BPNS)–TiO 2 nanosheet (TiO 2 NS) nanocomposites. QDs can not only improve the photocurrent of the developed PEC sensors, but also provide the electrochemical signal in the EC detection. BPNSs as p-type semiconductor with high conductive properties work as electron acceptors and are utilized to improve the sensitivity of the DA PEC and EC sensors. Under irradiation of visible light or the applied voltage, DA is both excited and releases electrons, realizing “turn-on” detection. The PEC sensors have a linear range of 0.1–100 μM with a lower detection limit of 0.028 μM. For the EC detection, BPNSs can accelerate electron transfer which attribute to its excellent conductivity. In the range of 1–200 μM, the working curve of DA detection by the EC sensors was established and the detection limit is 0.88 μM. Comparing the two methods, the PEC sensors have a lower detection limit, and the EC sensors have a wider monitoring range. The dual-mode sensors of EC and PEC pave an effective way for the detection in biological and medical fields. Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Kangning Liu,Jiliang Ma,Xiaopan Yang,Dongnv Jin,Yancong Li,Gaojie Jiao,Shuangquan Yao,Shaolong Sun,Runcang Sun
Photocatalytic biorefinery catches an ocean of attention because of its environmental friendliness. It is widely known that photocatalytic performance of TiO 2 is poor due to the wide bandgap and sluggish electron kinetics. Herein, biochar nanosheet and anatase TiO 2 (denoted as a- TiO 2 @MC) were combined to accelerate the charge separation/transfer and narrow the bandgap of TiO 2 , which is proved by UPS and Mott-Schottky plot analysis. With improved electron kinetics, comes excellent photocatalytic performance, which gave great yield of xylonic acid (52.26%) and lactic acid (49.22%). Furthermore, h + ,·OH, and 1 O 2 exerted positive effects on the synthesis of biomass-derived organic acids, in which the h + plays the major role in the biorefinery over a- TiO 2 @MC, whereas the·O 2 - is not. 1000-fold scale-up experiment indicated that 69.1% of the photocatalytic performance was achieved when compared with the similar conditions irradiated by visible light. This work provides an efficient photocatalytic biorefinery via a facile and low-cost way.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Dandan Liu,Haiou Liang,Chunping Li,Jie Bai
Photocatalytic water splitting is a prospective strategy to solve the shortage of human fossil fuel energy. In this work, we designed and synthesized the Pt as co-catalyst decorated on TiO 2 nanotubes/metastable zinc-blende (ZB) CdS nanoparticles (NPs) with highly exposed (1 1 1) facets (HPTCA3) via the electrospinning-solvothermal and chemical deposition methods. The H 2 evolution rate of HPTCA3 was 15025.38 μmol·g −1 ·h −1 , which was about 111.3 and 2.4 times stronger than that of pure CdS power and Pt-TiO 2 /CdS hollow nanotubes (HPTC). The XRD patterns showed the presence of acetate promoted the growth of ZB CdS (1 1 1) crystal facets, and the photogenerated electrons were easily tended to accumulate on the CdS (1 1 1) facets, whichwas conducive to the transmission of electrons on the CdS and TiO 2 interface. The type II heterojunction can broaden the visible light response range and accelerate the separation and transfer of photo-generated electrons and holes which can be supported by the Optical and Electrochemical characterizations. Band structure calculations and XPS spectrum indicated that the composite catalyst had an efficient electron transfer mechanism, which was beneficial for the spatial separation of photogenerated carriers. The work provides a rational photocatalyst design to improve the performance of photocatalytic splitting of water into hydrogen.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 15
·6878-6884
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IF 3.925
Yunfei Ma,Wenhui Yue,Ziwei Ye,Jinglong Zhang
Doping of TiO2 with metals and/or non-metals is an effective strategy for increasing its inherently low photocatalytic activity. In this work, TiO2 nanocrystals co-doped with nitrogen (N) and terbium (Tb) were prepared using a controlled hydrolysis method with water generated in situ via esterification of acetic acid and n-butanol. Compared with undoped TiO2 nanocrystals, co-doped TiO2 nanocrystals exhibited enhanced visible-light absorption and improved charge-carrier separation efficiency due to the synergy between N and Tb. In addition, they also had larger surface area and stronger interaction with the azo-dye acid orange 7 (AO7) compared with undoped TiO2 nanocrystals, giving rise to catalytic activity which was ca. 2× better than undoped TiO2 nanocrystals for photocatalytic degradation of AO7 under visible-light irradiation. For the given N loading, the optimal Tb doping for co-doped TiO2 nanocrystals to achieve the maximum activity was 1%, at which complete decolorization of AO7 was achieved after 5 hours of visible-light irradiation.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 12
·6649-6661
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IF 14.511
Junjie Ti,Jingwei Zhu,Benlin He,Zhihao Zong,Xinpeng Yao,Rui Tui,Hao Huang,Cong Chen,Haiyan Chen,Yanyan Duan,Qunwei Tang
The carrier recombination loss induced by defects, imperfect contact and energy level barriers at the buried interface severely restricts the greater advancement of comprehensive performance of perovskite solar cells (PSCs). Herein, a versatile inorganic ammonium salt of diammonium hydrogen phosphate (DAP) is exploited as a “double-sided tape” modifier to be deposited at the TiO2/perovskite buried interface, which not only passivates the surface defects of TiO2 and perovskite layers and simultaneously bridges the two films via the chemical reactions of hydrogen phosphate anions and ammonium cations in DAP with TiO2 and CsPbBr3 perovskite, respectively, but also ameliorates the interface contact and energy level alignment. Moreover, a higher quality perovskite film with fewer grain boundaries and defects is tightly formed on the DAP modified TiO2 layer arising from its lower wettability. Consequently, a substantially improved charge transport and extraction and minimized charge recombination are achieved in DAP tailored all-inorganic hole transport layer-free CsPbBr3 PSCs, yielding a power conversion efficiency as high as 10.31% with an impressive open-circuit voltage of 1.621 V, which is highly increased compared to 7.58% for the control device. Furthermore, the optimized device free of encapsulation exhibits a superior long-term stability after exposure to an air atmosphere at 85 °C with 85% RH over 720 h.
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CHROMATOGRAPHIA
·
2022
·Vol. 85
·期 4
·365-371
·
IF 2.213
Mei Ling,Tang Hao,Wang Shuai,Guo Yong,Liang Xiaojing
Sub-2-µm sea-urchin-like TiO 2 microspheres were prepared through the one-step solvothermal method. Results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that there are a lot of nanorods coming out from the center of the TiO 2 microsphere, making it look like a sea urchin. The morphology and structure of these microspheres are very suitable for chromatographic packing. During the separation of inorganic anions on this new stationary phase, the retention mechanism is electrostatic interaction, and the pH of the mobile phase plays an important role in retention behaviors. With this new stationary phase for separation of organic anions and nucleobases, Lewis acid–base interaction is more outstanding, which can cause peak broadening and tail for larger conjugated structure compounds. The separation of aromatic hydrocarbons on this new stationary phase demonstrates that Lewis acid–base interaction has a favorable influence on the separation of electron-rich aromatic hydrocarbons under normal phase chromatographic conditions. Graphical abstract
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TALANTA
·
2022
·
IF 6.556
Jinpeng Tao,Zaiqiong Liu,Zhenyu Zhu,Yanli Zhang,Hongbin Wang,Pengfei Pang,Chun Yang,Wenrong Yang
An ultrasensitive electrochemical detection of the activity and inhibition of T4 polynucleotide kinase (T4 PNK) was developed by using magnetic Fe 3 O 4 @TiO 2 core-shell nanoparticles , which was triggered by a rolling circle amplification strategy (Fe 3 O 4 @TiO 2 -RCA). We used Fe 3 O 4 @TiO 2 as a substrate to anchor a DNA primer . DNA S1 with 5′-OH termini was phosphorylated in the presence of T4 PNK and ATP, which was adsorbed on the surface of Fe 3 O 4 @TiO 2 NPs and served as the primer for subsequent RCA reactions. After adding circular template DNA S2, RCA was initiated in the presence of phi29 DNA polymerase and dNTPs. Then, Fc-labeled DNA S3 (Fc-S3) was hybridized with RCA. The obtained Fe 3 O 4 @TiO 2 -RCA was adsorbed on the surface of a magnetic gold electrode (MGE) by magnetic enrichment, resulting in an enhanced electrochemical signal. The T4 PNK activity can be monitored by measuring the electrochemical signal generated. This electrochemical assay is sensitive to the activity of T4 PNK with a dynamic linear range of 0.00001–20 U/mL and a low detection limit of 3.0 × 10 −6 U/mL. The proposed strategy can be used to screen the T4 PNK inhibitors, so it has great potential in the discovery of nucleotide kinase-target drug and early clinical diagnosis of cancer.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3452-3467
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IF 4.682
Du Chunxiao,Liu Gaoyang,Qu Zhongji,Wang Wei,Yu Dan
Over the years, graphene oxide (GO) with unique permeability and selectivity has been extensively researched for hydrophilic enhancement modification, especially as the separation layer of oil–water separation composite membranes. However, the poor stability caused by hydration of GO, and the low water flux caused by the lamellar compaction limit its application. In this study, a surface modification strategy based on metal polyphenol coordination was proposed to address these problems by co-deposition of tannic acid-graphene oxide (TA-GO) and TiO 2 on electrospun polyvinylidene fluoride (PVDF) membrane. TiO 2 was inserted into GO layers to expand the interlayer spacing and prevent membrane compaction. Moreover, the interlayer force was enhanced by TA and Fe 3+ through covalent bonds, cation-π, and coordination bond. The results demonstrated that the underwater oil contact angle of resultant composite membrane reached 152.5°. In addition, it has a high flux (243.11 L/h·m 2 ·bar) and oil (> 98%)/salt (> 47%) rejection, which can be maintained even after ultrasonic treatment for 30 min. This work proposed a practical and environmental approach to construct a steady GO-modified hydrophilic membrane. Graphical abstract
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 128
·期 1
·1-14
·
IF 2.584
Chen Peng,Wu Keliang,Peng Xiang,Ma Yue,Yang Xuqi,Duan Xinping,Ma Yan,Liu Zhiyong
Hydrogen and oxygen production based on photocatalytic monolithic water splitting is considered to be one of the effective ways to produce sustainable and clean energy. The key challenge in this process is to develop new photocatalysts that can simultaneously produce H 2 and O 2 at a stoichiometric ratio of 2:1 without the use of any sacrificial agents. In order to solve this problem, highly efficient and ingenious photosystems in nature have been studied intensively. Herein, we prepared printable Z-type composite photocatalysts CdS@TiO 2 /Pt/ITO/WO 3 /Co 3 O 4 mimicking biological vegetative leaves in nature and constructed an “artificial leaf” device that completely decomposes water. We use an electron solid penetrating transporter ITO, which can rapidly transfer photogenerated electrons and photogenerated holes and reduce the compound rate of photogenerated carriers. Thus, the efficiency of photocatalytic total water dissolution is enhanced. This photocatalyst was able to produce both H 2 and O 2 in water with an H 2 production rate of 75.93 μmol g −1 h −1 and an O 2 production rate of 36.49 μmol g −1 h −1 . We designed the oxygen-producing photocatalyst WO 3 /Co 3 O 4 , which produced oxygen at a rate of 159.21 μmol g −1 h −1 6 times higher than that of WO 3 alone. Furthermore, the morphology, composition, and microstructures of the photocatalyst were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and nitrogen adsorption–desorption.
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