MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-12
·
IF 5.3
Ruan Shuyan,Wang Wenxi,Qiu Liting,Yan Xin,Peng Zhihua,Zhu Huina,Liu Yunzhen,Lu Yudong,You Ruiyun
A simple and cost-effective fabrication method of gold nanorods (AuNRs) nanoparticles hybridized with polyvinyl alcohol hydrogel (AuNR/PVA) for SERS substrate is described. The AuNR/PVA achieves the control of inter-particle nanogap by modulating the density of gold nanorods, and inter-particle nanogap by the spatial deformation of the hydrogel, and the reduction of the gap between the AuNRs deposited on hydrogel makes the SERS enhancement. In addition, the AuNR/PVA substrate maintains high SERS activity after more than 100 cycles of bending and storage in air for 30 days, and the substrate possesses high sensitivity and high reproducibility. Combining a flexible and transparent surface-enhanced Raman spectroscopy (SERS) substrate for in situ detection with a small portable Raman can be applied to scenarios such as environmental detection and hazardous materials detection. The substrate showed excellent SERS activity against malachite green (MG) and crystal violet (CV) with limits of detection of 1.18 × 10 −13 M and 7.17 × 10 −12 M, respectively. The usability of the proposed SERS substrate was demonstrated by detecting the above contaminants in aquatic water. This work not only utilizes a cost-effective method for mass production but also provides a reliable and convenient platform for the preparation of other noble metal flexible substrates. Graphical
✓ 已验证
DOI
高影响因子
BioEnergy Research
·
2024
·Vol. 17
·期 3
·1493-1502
·
IF 3.1
Jiao MeiZhen,Zhang Xinran,Wang Yiqin,Du Jian,Tao Yehan,Lv Yanna,Chen Ming,Lu Jie,Wang Haisong
Reed sawdust is a kind of paper mill waste with high cellulose and hemicellulose content. To promote the rational use of resources, it is essential to make full use of waste resources and transform them into new values. In this work, reed sawdust was pretreated with liquid hot water (LHW) at 170 °C for 30 min. A total of 39.00 g/L glucose was obtained after enzymatic saccharification of cellulose at 50 °C, 20 FPU/g- reed sawdust cellulase, 25% (w/v) reed sawdust, in 5 replenishments. When the fermentation was performed 96 h, the medium contained xylo-oligosaccharides (XOS) 11.74 g/L and biomass 15.21 g/L, in which lipid was 4.14 g/L. After spray drying, feed additives containing 29.17% XOS and 10.29% docosahexaenoic acid (DHA) can be prepared. In particular, the hemicellulose and cellulose in reed sawdust are creatively used at the same time without separation, which greatly reduces the cost of purification in traditional processes and provides a new way for the high-value transformation of sawdust resources.
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 3
·1957-1966
·
IF 4.9
Pan Ying,Wang Wei,Liang Qianyong,Du Jia,Zhang Dong,Zhao Hongting,Lü Ting,Zhang Yan
Nitrogen and phosphorus co-doped carbon dots (N, P co-doped CDs) were synthesized using a one-pot hydrothermal carbonization method. The resulting CDs were then applied to fabricate a multilayered coating on cotton fabric through a layer-by-layer self-assembly method, in combination with alginate and polyethyleneimine. When exposed to a 365 nm UV lamp, the coating containing N, P co-doped CDs emitted visible blue light. The cotton treated with these CDs was subsequently evaluated for UV-protection, thermal stability, and flame retardancy. Cotton-1 fabric (110 g/m 2 ) treated with a 6-bilayer CD-containing coating had a significantly higher ultraviolet protection factor (UPF) of 148.4 compared to the pure cotton fabric which had a UPF of 6.65. The cotton-1 fabric treated with CD coating exhibited more char residues at 700 °C under a nitrogen atmosphere in the TGA test. The study also discovered that the CD-containing multilayered coating significantly decreased the peak heat release rate and total heat release rate of cotton-1/(PEI/ACD) 6 by 52.8% and 53.8% respectively, in comparison to cotton-1 in the microscale combustion calorimeter test. These findings indicate that N, P co-doped CDs, which have both UV absorption and environmental friendliness, could be potential utilized as a flame retardant on the surface of cotton fibers. Graphical abstract
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3381-3393
·
IF 3.5
Zhang Feng,Wang Hao
Exorbitant cost and limited availability of platinum-based electrocatalysts for the oxygen reduction reaction (ORR) in metal–air batteries and alkaline fuel cells pose significant obstacles to the large-scale commercialization of these clean-energy technologies. Herein, we employed a cost-effective and sustainable bacterial cellulose biomass as the precursor to prepare a nitrogen and fluorine codoped metal-free ORR electrocatalyst (BCC-NF-900) by direct pyrolysis regulation. The BCC-NF-900 inherited the three-dimensional framework of bacterial cellulose, exhibiting a robust porous structure with a Brunauer–Emmett–Teller surface area of 196.9 m 2 ·g −1 . The pyridinic N (0.6 at%) and semi-ionic F (0.34 at%) species formed in the inert sp2 carbon skeletons synergistically regulated the electron spin and charge density of the adjacent C atoms. Such rational combination of a rapid transport pathway and effective active site led to high ORR activity (onset potential 0.89 V vs. RHE), methanol resistance, and electrochemical stability (merely 6.9% current loss) in alkaline electrolyte. Importantly, compared to the mere F-doped BCC-F-900 (onset potential 0.82 V vs. RHE) and N-doped BCC-N-900 (onset potential 0.77 V vs. RHE) catalysts, the BCC-NF-900 catalyst exhibited a markedly enhanced ORR performance, as evidenced by the measured onset potential. This study provides an available reference for the design of efficient metal-free catalysts for ORR, presenting a promising alternative to Pt/C catalysts in metal–air batteries and alkaline fuel cells.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-8
·
IF 2.8
Ma Jianli,Zhang Yu,Chen Chen,She Yubin
An efficient reaction sintering process is engaged to synthesize a series of non-stoichiometric Li 2(1+ x ) Mg 3 TiO 6 ( x = 0.01, 0.02, 0.03, 0.04) microwave dielectric ceramics. The single phase of Li 2 Mg 3 TiO 6 with rock-salt structure is accurately recognized by XRD. Pores left on the surface and inside the sample can be clearly observed from SEM pictures. Excessive Li + affects the local charge distribution, which influences the response of the dielectric material to the electric field. The pores are not the same medium as the matrix material, and the signal is refracted and scattered when it passes through the pores. Refractions and scatterings increase the signal transmission distance and also increase the transmission loss. These residual Li + and pores eventually affect the dielectric properties as well. Finally, at x = 0.02 and a sintering temperature of 1260 °C, the ceramic samples showed good dielectric properties: ε r = 10.983, Q×f = 107,367 GHz and τ f = − 24.2 ppm/°C.
✓ 已验证
DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2023
·Vol. 154
·期 3
·367-377
·
IF 1.8
Guo Xuejing,Zhang Yewen,Peng Yanqing
Application of solar thermal energy relies on photothermal effect is one of the emerging topics in green chemical research. Polyethylenimine-grafted graphene oxide (PEI@GO) can harvest thermal energy directly from visible light and be employed as photothermal catalyst in model reactions. Furthermore, this nanocomposite used in carbon dioxide capture-and-release processes relied on photothermal regeneration. Graphical abstract
✓ 已验证
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 4
·2473-2480
·
IF 9.9
Bo Chunling,Zhang Li,Liu Xiaolong,Chang Huaiqiu,Sun Yingxue,Zhang Xinyi,Tan Ting,Piao Lingyu
Partial oxidation of methane into primary oxidation products with high value remains a challenge. In this work, photocatalytic oxidation of methane (CH 4 ) with high methyl hydroperoxide (CH 3 OOH) selectivity is achieved using pure titanium oxide (TiO 2 ) without any cocatalyst at room temperature and atmospheric pressure. The CH 3 OOH production rate can reach up to 2050 ± 88 µmol·g −1 ·h −1 at pH ≈ 7.0 with 100% selectivity in the liquid product. The stable reaction cycle can reach more than 30 times. This low-cost system achieves superior CH 4 conversion activity and selectivity compared with similar work. The energy of hydrogen peroxide (H 2 O 2 ) to adsorbed hydroperoxyl radical (⋆OOH) has a significantly lower reaction energy than conversion to adsorbed hydroxyl radical (⋆OH) on the (210) surface of the TiO 2 . The ⋆OOH preferentially combines with methyl radical (·CH 3 ) to form the most energetically favorable CH 3 OOH. The mild oxidative environment of this system prevents the reduction of CH 3 OOH to CH 3 OH or over-oxidation of CH 4 , which ensures the final CH 3 OOH with high selectivity and stability. This work provided a low-cost but highly efficient method to achieve partial oxidation with superior selectivity, i.e., to convert CH 4 into high-value chemicals.
✓ 已验证
DOI
高影响因子
RARE METALS
·
2017
·Vol. 37
·期 4
·333-342
·
IF 1.189
Feng Dan,Chen Yue-Xing,Fu Liang-Wei,Li Ju,He Jia-Qing
Earth-abundant IV–VI semiconductor SnSe is regarded as a promising thermoelectric material due to its intrinsic low thermal conductivity. In this report, the highly textured SnSe/Ag 2 Se composites were first designed by solid solution method followed by spark plasma sintering (SPS) and their thermoelectric properties in two directions were investigated, and then, the performance of composites was further optimized with an additional ball milling. The coexistence of SnSe and Ag 2 Se phases is clearly confirmed by energy-dispersive X-ray spectroscopy (EDX) in transmission electron microscopy (TEM). After ball milling, the size of SnSe grains as well as the incorporated Ag 2 Se particles reduces effectively, which synergistically optimizes the electrical and thermal transport properties at high temperature range. As a result, a maximum ZT of ~ 0.74 at 773 K for SnSe + 1.0%Ag 2 Se in the direction vertical to the pressing direction is achieved. Composite engineering with additional ball milling is thus proved to be an efficient way to improve the thermoelectric properties of SnSe, and this strategy could be applicable to other thermoelectric systems. Graphical
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·Vol. 28
·期 8
·2763-2776
·
IF 2.6
Qiao Xue,Liu Tao,Wang Xuyang,Du Haiyan,Liu Zigeng,Wang Wei
Electrodeposited iron films demonstrate commendable attributes such as a high magnetic flux density and enhanced stability. Nevertheless, the occurrence of the hydrogen evolution side reaction during the electrodeposition of iron films significantly increases the internal stress within the films and simultaneously reduces the electrodepositing current efficiency. This study aims to mitigate the hydrogen evolution during electrodeposition of iron by using acetamide (C 2 H 5 NO) as additive. Electrochemical measurements conducted in this study reveal that the presence of C 2 H 5 NO molecules in the solution effectively hinders the electrochemical reduction of H + ions, leading to an improvement in the current efficiency for iron electrodeposition, rising from 79 to 87%. Furthermore, analyses using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) clearly demonstrate that the addition of C 2 H 5 NO to the electrolyte solution significantly reduces the internal stress of the electrodeposited iron film from 442 to 74 MPa. This reduction, in turn, cause preference a smoother surface, eliminating the occurrence of cracks. Additional insights from Density Functional Theory (DFT) calculations reveal that C 2 H 5 NO molecules within the solution modify the electrode/solution interface by forming a robust and densely adsorptive layer, primarily composed of C 2 H 5 NO molecules, on the surface of the iron cathode. Moreover, it is noteworthy that C 2 H 5 NO molecules exhibit a preference for binding with H + ions over H 2 O molecules, thus effectively obstructing the diffusion of H + ions to the electrode surface within the solution.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 8
·4299-4308
·
IF 2.599
Wang Zhengdong,Cheng Yonghong,Wang Hongkang,Yang Mengmeng,Shao Yingyu,Chen Xin,Tanaka Toshikatsu
Development of polymer-based composites with simultaneously high thermal conductivity and breakdown strength has attracted considerable attentions owing to their important applications in both electronic and electric industries. In this study, we successfully design novel epoxy-based composites with nano-Al 2 O 3 /epoxy composite layer sandwiched between micro-Al 2 O 3 /epoxy composite layers, which show synergistically and significantly enhanced thermal conductivity and breakdown strength. Compared with the traditional composites, the bottleneck that both thermal conductivity and breakdown strength cannot be simultaneously enhanced can be overcome successfully. An optimized sandwiched alumina–epoxy composite with 70 wt% micro-Al 2 O 3 fillers in the outer layers and 3 wt% nano-Al 2 O 3 in the middle layer simultaneously displays a high thermal conductivity of 0.447 W m −1 K −1 (2.4 times of that of epoxy) and a high breakdown strength of 68.50 kV mm −1 , which is 6.3 % higher than that of neat epoxy (64.45 kV mm −1 ). The experimental results on the thermal conductivity of multi-layered alumina–epoxy composites were in well accordance with the theoretical values predicted from the series conduction model. This novel technique simultaneously improves thermal conductivity and breakdown strength, which is of critical importance for design of perspective composites for electronic and electric equipments.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 14
·11795-11800
·
IF 2.324
Bai Ya,Qu Shaohua,Jia Zirui,Zhang Limin,Zhu Guangyao,Feng Ailing,Wu Guanglei,Wu Hongjing
The cyclic stability of Cr 2 O 3 is very poor due to the large volume change during lithiation/delithiation. In this study, we have found that Cr 2 O 3 nanocrystals synthesized by using a simple hydrothermal method can improve its cyclic stability. Sample calcined at 430 °C has uniform size, compact structure and high crystallization degree. These Cr 2 O 3 nanocrystals exhibit a stable cyclic performance of 185 mAh g −1 after 100 cycles at 100 mA g −1 . It is useful in real life, such as providing power consumption for minitype device, etc.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 54
·期 2
·1021-1028
·
IF 2.2
Yao Zhujun,Jia Qixiang,Xiang Jiayuan,Tu Fangfang,Shi Juntao,Zhang Yuhong,Huang Jianhao,Jiang Yuanyuan,Gong Wei,Yang Donghui
Halides not only possess high ionic conductivity but also exhibit excellent electrochemical stability against high-voltage cathodes, making them promising candidates for solid-state electrolytes in all-solid-state lithium metal batteries (ASSLMBs). Compared with rare-earth halide electrolytes, Li 2 ZrCl 6 electrolytes are less costly. However, they face challenges relating to relatively lower ionic conductivity. Herein, Li 2+ x Zr 1− x La x Cl 6 is synthesized through La 3+ doping in Li 2 ZrCl 6 . The introduction of La 3+ increases the concentration of lithium ions in the crystal and expands the lattice volume, leading to ionic conductivity as high as 8.22 × 10 −4 S cm −1 . When Li 2.1 Zr 0.9 La 0.1 Cl 6 is applied in ASSLMBs (with a LiNi 0.8 Mn 0.1 Co 0.1 O 2 cathode and a Li-In anode), it exhibits superior electrochemical performance, with high initial capacity of 132.5 mA h g −1 , and after 100 cycles at 0.5 C, the battery still maintains a capacity of 72.4 mA h g −1 and high coulombic efficiency of 99.7%. Graphical
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）