APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Amin Kan,Yandong Duan,Jingkuo Guo,Tianjiao Wu,Lin Wang,Yumei Zhang,Qingzhi Luo,Qiong Lu,Yaqiang Zhang,Yu Liang,Guang Yang,Huaiyu Zhang,Huiying Mu,Qiqi Han,Desong Wang
Active site tuning in catalyst design is the key to improving the catalyst performance. Herein, we introduce single cobalt atoms into carbon-doped boron nitride (C-BN) and find, to our surprise, that the photocatalytic CO 2 reduction site of C-BN shifts from CN 3 to CB 3 . The catalyst Co/C-BN with new active sites exhibits excellent photocatalytic activity and selectivity of CO without adding sacrificial reagents, while the side reaction of hydrogen evolution is significantly inhibited. Theoretical calculations show that the introduced Co atom changes the spin density of the neighboring catalytic site, thus regulating the adsorption energy of the catalytic site for active intermediates (COOH*). Compared with CN 3 site, CB 3 in Co/C-BN shows superiority in CO* formation elementary step for the conversion of CO 2 to CO, and inhibits the generation of adsorbed H 2 in the competitive water-splitting reaction. This work provides valuable insights into the design of highly efficient catalysts in the future.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2494-2504
·
IF 6.4
Xinxu Li,Bingting Bao,Xinyu He,Guoqiang Wang,Yantang Huang,Lingyun Li,Yan Yu
Optical temperature sensing technology, especially the fluorescence intensity ratio (FIR) type sensor based on Er3+, Yb3+ co-doped up-conversion (UC) luminescent materials, presents numerous opportunities in the field of temperature detection. Various Er3+, Yb3+ co-doped fluorides and oxides have been explored for the application of temperature sensing. Most of these Er3+, Yb3+ co-doped sensing materials are phosphors, for which the high temperature phase and chemical stability is still challenging. The Er3+, Yb3+ co-doped oxide single crystal is a promising solution to explore temperature sensing materials with practical application ability. In this work, an Er3+, Yb3+ co-doped LaBMoO6 single crystal (LBMO-SC: Er3+, Yb3+) is grown through flux assisted spontaneous crystal growth technology. Compared with the Er3+, Yb3+ co-doped LaBMoO6 polycrystalline samples (LBMO-PC: Er3+, Yb3+), the LBMO-SC: Er3+, Yb3+ shows improved UC performance with enhanced light emission and prolonged luminescence lifetime. The UC performance improvement results from the more efficient energy transfer between Yb3+ and Er3+. The energy transfer efficiency from Yb3+ to Er3+ in the LBMO-PC: Er3+, Yb3+ powders sintered at 1000 °C for 15 h is 7.3%, while it is 29.7% in the LBMO-SC: Er3+, Yb3+. The strong UC luminescence of LBMO-SC: Er3+, Yb3+ extends the temperature detection range; the luminescence of 4S3/2 → 4I15/2 in LBMO-SC: Er3+, Yb3+ is still measurable even when the temperature reaches 570 K. The LBMO-SC: Er3+, Yb3+ has a maximum value of relative temperature sensitivity of 1.16% K−1 at 300 K. Finally, an optical fiber type temperature sensor with practical application capability is successfully fabricated by using LBMO-SC: Er3+, Yb3+ as the luminescence sensing medium.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 7
·3565-3574
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IF 11.9
Wenpeng Zang,Sijin Jin,Shuxiong Fu,Yuhao Wang,Yingjie Jiang,Xueying Liu,Nanying Ning,Ming Tian,Liqun Zhang
To achieve dielectric elastomer generators (DEGs) with excellent energy harvesting performance and long life, electrode materials with high compliance, high electrical conductivity (EC), high stability of EC under high strain, and high durability are key. Nevertheless, the compliance of previously reported electrodes for DEGs still needs to be improved, and they cannot be repaired at room temperature after being damaged, inducing the trouble of disassembling the DEG device. In this study, a highly conductive supermolecule-based electrode material for DEGs was designed and prepared by synthesizing a polyborosiloxane supermolecule network (PBS-SN) matrix with multiple dynamic bonds followed by introduction of highly conductive carbon black (CB) and carbon grease (CG) into the PBS-SN matrix. Benefiting from the multiple dynamic bonds of the PBS-SN matrix and the introduction of appropriate content of a silicone oligomer (SO) with high chain mobility and plasticizing effect, the as-prepared CB/CG/PBS-SN electrode exhibits a high elongation at break (>1000%), high compliance, high self-healing efficiency of EC at room temperature (93% for 3 h), good recyclability (at least five times without performance reduction) and high durability (up to 10 000 cycles). Compared with a DEG using the commonly used CG electrode, the DEG using the CB/CG/PBS-SN electrode exhibits higher energy density, which is 60.9% higher than that of the former, and much higher than that reported in many previous studies. The excellent room temperature self-healing ability of the electrode can help the in situ repair of the DEG device, reducing the trouble of disassembling the device and improving the convenience of usage.
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Nanoscale
·
2023
·Vol. 15
·期 8
·4063-4070
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IF 6.7
Mengjiao Li,Qingjie Yu,Meie Zheng,Rongrong Jiang,Hongda Zhu,Huiling Guo,Hongmei Sun,Mingxing Liu
A label-free electrochemical immunosensor for high-sensitive detection of β-amyloid 1–42 (Aβ 1–42) was constructed based on Au-modified B, S, and N co-doped reduced graphene oxide (Au-BSN-rGO). The electronic structure of Au-BSN-rGO was investigated by first-principles calculations, which showed that the band gap of graphene was opened, thus improving its electrical conductivity. Moreover, Au-BSN-rGO was successfully prepared and characterized, and the obtained results discovered that it could be used as a signal amplifier for immunosensors due to the advantages of the good electrochemical characteristics and enormous surface area of BSN-rGO and the accelerated electron transfer ability of Au NPs. Furthermore, the label-free electrochemical immunosensor had a linear detection range of 0.1 pg mL−1–10 ng mL−1 and a detection limit of 0.072 pg mL−1, and it had good specificity, stability, and reproducibility. Also, this immunosensor showed recoveries of 89%–109% with an RSD of 2.61%–4.19% for detecting Aβ 1–42 in actual sample analysis. Therefore, the label-free electrochemical immunosensor based on Au-BSN-rGO should have a promising clinical application prospect for detecting Aβ 1–42.
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PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 4
·1875
·
IF 4.6
Zhong-Lei Meng,Rong-Xiu Qin,Ru-Si Wen,Gui-Qing Li,Zhong-Yun Liang,Jun-Kang Xie,Yong-Hong Zhou,Zhang-Qi Yang
This study examined the preparation of isobornyl acetate/isoborneol from camphene using an α-hydroxyl carboxylic acid (HCA) composite catalyst. Through the study of the influencing factors, it was found that HCA and boric acid exhibited significant synergistic catalysis. Under optimal conditions, when tartaric acid–boric acid was used as the catalyst, the conversion of camphene and the gas chromatography (GC) content and selectivity of isobornyl acetate were 92.9%, 88.5%, and 95.3%, respectively. With the increase in the ratio of water to acetic acid, the GC content and selectivity of isobornol in the product increased, but the conversion of camphene decreased. The yield of isobornol was increased by adding ethyl acetate or titanium sulfate/zirconium sulfate to form a ternary composite catalyst. When a ternary complex of titanium sulfate, tartaric acid, and boric acid was used as the catalyst, the GC content of isobornol in the product reached 55.6%. Under solvent-free conditions, mandelic acid–boric acid could catalyze the hydration reaction of camphene, the GC content of isoborneol in the product reached 26.1%, and the selectivity of isoborneol was 55.9%. The HCA–boric acid composite catalyst can use aqueous acetic acid as a raw material, which is also beneficial for the reuse of the catalyst.Keywords:α-hydroxyl carboxylic acid;camphene esterification reaction;camphene hydration reaction;green synthesis
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高影响因子
ELECTROPHORESIS
·
2023
·
IF 2.9
Zhiyong Zhang,Xiaoyang Zhang,Shunan Li,Yun Chen,Zheng Li,Yunlan Lian,Wenlong Li
In this study, the capillary electrophoresis-photodiode array detector was employed for the analysis of four iridoid compounds in Gentiana macrophylla Radix (RGM), and the method was optimized based on the concept of analytical quality by design (AQbD). The peak areas relative standard deviation ( n = 3) and resolution of the four analytes were selected as critical method attributes. Fractional factorial design test combined with Pareto analysis were employed to screen critical method parameters (buffer concentration, pH, sodium dodecyl sulfate [SDS] micelle concentration, temperature, and voltage). Subsequently, three main factors (buffer concentration, buffer pH, and SDS concentration) were selected by central composite design test for constructing the design space. The optimal separation conditions as follows: capillary column (50.2 cm × 50 µm, detection length 40 cm). Working background electrolyte consisted of 51 mmol/L borax solution (pH = 9.47) and 40 mmol/L SDS. The samples were injected by pressure (5 s at 0.5 psi) and the detection was performed at 254 nm. Applied voltage was 20 kV and column temperature was 23°C. The developed method is rapid and reliable for the quantitative analysis of four iridoid compounds in RGM, providing a reference for the application of AQbD concept in the analysis of natural products.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Zhao Du,Huayi Cai,Zhiyuan Zhao,Zhonglu Guo,Jing Lin,Yang Huang,Chengchun Tang,Guifeng Chen,Yi Fang
Herein, the graphene quantum dots (GQDs) as a photosensitizer have been introduced on the surface of C-doping porous BN nanoribbons (C-BNNR) to form a series of 0D/1D GQDs/C-BNNR heterojunctions as metal-free catalysts with excellent photocatalytic activity. the C-BNNR with sensitization of GQDs is innovatively applied to the field of CO 2 photocatalytic reduction. The results reveal that GQDs/C-BNNR heterojunctions exhibit excellent optical properties and photocatalytic activity. The CO production rate of GQDs/C-BNNR-3 (33.47 μmol g -1 h -1 ) is 14.49, 4.60 and 2.95 times higher than GQDs (2.31 μmol g -1 h -1 ), BNNR (7.27 μmol g -1 h -1 ) and C-BNNR (11.34 μmol g -1 h -1 ), respectively. This work demonstrates that the addition of GQDs can significantly improve the light utilization of C-BNNR without any effect on the structure. In addition, the strong interaction between the GQDs and C-BNNR leads to the formation of a built-in electric field. It allows photogenerated electrons in GQDs to be transferred into C-BNNR and complexed with holes. As a result, the photogenerated electrons in C-BNNR are induced to participate in the CO 2 photocatalytic reduction process. Meanwhile, GQDs/C-BNNR possess certain CO 2 photocatalytic reduction ability in the NIR region due to the upconversion ability of GQDs. This work pioneer the application of GQDs/C-BNNR heterojunctions in CO 2 photocatalytic reduction and further provides new ideas for the design of novel metal-free catalysts.
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Biosensors-Basel
·
2023
·Vol. 13
·期 1
·116
·
IF 5.4
Jingli Yin,Huiying Ouyang,Weifeng Li,Yumei Long
Currently, accurate quantification of antibiotics is a prerequisite for health care and environmental governance. The present work demonstrated a novel and effective electrochemical strategy for chloramphenicol (CAP) detection using carbon-doped hexagonal boron nitride (C-BN) as the sensing medium. The C-BN nanosheets were synthesized by a molten-salt method and fully characterized using various techniques. The electrochemical performances of C-BN nanosheets were studied using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results showed that the electrocatalytic activity ofh-BN was significantly enhanced by carbon doping. Carbon doping can provide abundant active sites and improve electrical conductivity. Therefore, a C-BN-modified glassy carbon electrode (C-BN/GCE) was employed to determine CAP by differential pulse voltammetry (DPV). The sensor showed convincing analytical performance, such as a wide concentration range (0.1 µM–200 µM, 200 µM–700 µM) and low limit of detection (LOD, 0.035 µM). In addition, the proposed method had high selectivity and desired stability, and can be applied for CAP detection in actual samples. It is believed that defect-engineeredh-BN nanomaterials possess a wide range of applications in electrochemical sensors.Keywords:hexagonal boron nitride;carbon doping;chloramphenicol;differential pulse voltammetry;molten salt synthesis
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Wei Yue,Bingyong Lin,Yueyue Huang,Yueliang Wang,Yuanyuan Yao,Lifen Chen,Yanbo Zeng,Lei Li,Zhaosheng Qian,Longhua Guo
Microcystin-LR (MC-LR) is a strong liver toxin, which will enter the human body by eating MC-LR-contaminated aquatic products. Therefore, it is urgent to explore whether people are exposed to MC-LR-contaminated aquatic products. Herein, a sensing strategy based on aptamer-recognized SERS tag coupled with magnetic separation was developed for ultrasensitive and specific detection of MC-LR in fish organs. This sensor had a dynamic range of 0.1 ng/L to100 µg/L and a limit of detection down to 0.1 ng/L for MC-LR. This ultrasensitive and rapid separation strategy allow us to explore the bioaccumulated amount of MC-LR in different fish organs. The results show that the order of MC-LR content accumulated in different organs of local crucian carps were heart > liver > kidney > meat > spleen. The MC-LR content in fish meat was 1.1–8.5 times of the WHO proposed tolerable daily intake level (TDI), implying the aquatic products in local aquatic market had potential threats to human health.
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CHINESE JOURNAL OF CATALYSIS
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2022
·
IF 12.92
Qixian Xie,Dan Ren,Lichen Bai,Rile Ge,Wenhui Zhou,Lu Bai,Wei Xie,Junhu Wang,Michael Grätzel,Jingshan Luo
Nickel iron layered double hydroxide (NiFe LDH) is one of the best oxygen evolution reaction (OER) catalysts in alkaline electrolytes. However, it performs poorly in neutral electrolytes, and the detailed mechanism is still unclear. Herein, we introduce electrochemical measurements, operando surface enhanced Raman spectroscopy and operando 57 Fe Mössbauer spectroscopy to elucidate the mechanism of NiFe LDH for OER process in different pH electrolytes. Our results show that even though there exist Ni 3+ and Fe 4+ species, the NiFe LDH based electrocatalysts still show worse OER performance in neutral electrolytes than in alkaline conditions. Combining the electrochemical measurements with spectroscopic investigations, we demonstrated that the rate-determining step (RDS) of OER on NiFe LDH based electrocatalysts is from *O to *OOH in alkaline medium while *OH formation is the RDS in neutral conditions. Our work provides new insights into elucidating the OER mechanism in different pH electrolytes.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Zirui Song,Kai Guo,Wenjuan Bai,Chengchun Tang
Heavy metals in water environment do great harm to the life and health of the public and the stability of the ecological environment. Therefore, it is necessary to find an efficient solution to deal with the increasingly serious problem of heavy metal pollution. In this paper, N, N'-methylene bisacrylamide was loaded on porous boron nitride (pBN) surface with a simple synthesis method using 3-aminopropyltriethoxysilane as a coupling agent for the adsorption of Cr(VI). The prepared adsorbents were characterized with XRD , SEM, TEM , FTIR, XPS , BET, and other analytical methods. We discovered that the capacity of pBN-AS@MBA reached 83.78 mg/g, which was significantly higher than that of pBN, with an initial concentration of 20 mg/L of Cr(VI). Besides, the chemosorption of exothermic spontaneity predominated the entire process, determined from pseudo-second-order kinetics, intra-particle diffusion model, thermodynamics, and Langmuir isotherm. Not only Cr(VI) chemically react with amine groups on the sorbent , but also elicited electrostatic attractions. The reusability of sorbent was proved with a reduction rate of lower than 20%, after a few cycles of running.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 3
·1912-1920
·
IF 4.186
Gang Wang,Zhipeng Chen,Hui Yan,Tao Xuan,Mengyan Wu,Xue Zhu,Tong Ding,Li Ding,Xingang Ren,Xianliang Wu,Huaiwu Zhang
Low-temperature co-fired ceramics technology (LTCC) exhibits enormous superiorities in packaging, integration, and interconnection. However, the complex compositions of low-melting point sintering aids may react with ceramic matrix, which increases the difficulties of phase control and tape casting. In this work, the Li 2 CO 3 –B 2 O 3 –Bi 2 O 3 –SiO 2 (LBBS) sintering aid was adopted to sinter ZnZrNb 2 O 8 ceramics with single phase at low temperatures. The LBBS glass could be used to fabricate pure-phase ZnZrNb 2 O 8 ceramics at a low sintering temperature, promote the grain growth, and increase the densification of ZnZrNb 2 O 8 ceramics. Furthermore, the unit cell volume, NbO 6 octahedral distortion, Raman shift, and FWHM changed along with LBBS addition, thereby affecting the microwave dielectric properties. Remarkably, ZnZrNb 2 O 8 ceramics doped with 0.75 wt.% LBBS at 950°C were chemically compatible with the silver electrode and exhibited excellent microwave dielectric characteristics: ε r = 27.1, Q × f = 54 500 GHz, and τ f = −48.7 ppm/°C, providing candidates for LTCC applications.
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