Small
·
2023
·Vol. 19
·期 50
·2304918
·
IF 13.3
Haotian Jiang,Chengjuan Wang,Bowen Cui,Xiaodan Xu,Mengfan Li,Zhenhao Xu,Hongxue Tan,Chengguo Wang,Yanxiang Wang
Developing composite materials with the synergistic effects of heterogeneous structures and multiple components is considered as a promising strategy to achieve high-performance electromagnetic wave (EMW) absorbers. To further satisfy the demand of broadband and strong microwave absorption, a novel NiS/carbon nanofibers (CNFs)/porous carbon composite is successfully synthesized by hydrothermal and chemical vapor deposition using lotus leaves as a biomass carbon source. A few carbon nanotubes (CNTs) and uniformly dispersed Ni nanocrystals have also been found in the hybrid. Benefiting from the porous structure derived from lotus leaves, the combination of dielectric NiS, conductive carbon nanomaterials, and magnetic Ni nanoparticles, together with the three-dimensional conductive network of CNFs and CNTs, the remarkable EMW absorption properties with a minimum reflection loss up to −67.65 dB have been achieved at merely 2.32 mm. Besides, the widest effective absorption band can reach 5.9 GHz with a thin thickness of 2.07 mm, covering almost the entire Ku band. In addition, under the incident angle of 31°, the radar cross-section reduction value of LNSF-600 can reach 42.88 dBm2. Therefore, this work provides an efficient and facile method for manufacturing outstanding biomass-derived EMW absorbers.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Haodong Sun,Lulu Zheng,Yaru Xi,Shangru Zhai,Qingda An,Zuoyi Xiao
Biomass-based carbon electrode material with hierarchical porous structure is considered as a promising candidate for supercapacitor applications, which could enhance the electron transfer and shorten the ion diffusion pathways. However, the low energy density of carbon-based materials seriously affects their wide applications. Herein, 3D N-doped hierarchical porous carbon coupled with nickel-iron sulfide nanoparticles (Fe 5 Ni 4 S 8 /FeS@N-HPC) is fabricated by a simple pyrolysis process . The 3D N-doped interconnected porous structure with large specific surface area provides more channels for ion transport and electron transfer. The nickel-iron sulfide nanoparticles in the porous carbon offer numerous sites for reduction and oxidation occurring to improve the charge storage for supercapacitors. Consequently, the synthesized Fe 5 Ni 4 S 8 /FeS@N-HPC electrode exhibits excellent electrochemical properties. The optimized Fe 5 Ni 4 S 8 /FeS@N-HPC composite fabricated under 800 °C displays an excellent capacitance of 2812.4 F g −1 (734.56 C g −1 ) at a current density of 0.5 A g −1 . Beside, the Fe 5 Ni 4 S 8 /FeS@N-HPC-800//active carbon asymmetric supercapacitor shows an energy density of 76.8 W h kg −1 at a power density of 395.03 W kg −1 and superior cycling stability of 93.24% over 10,000 charge-discharge cycles. Our work presents a novel approach to the construction of high-performance electrode materials for supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Zhen Lin,Chuangui Cai,Wei Chen,Qian Deng,Jialin Yang,Kaiyuan Huang,Haohua Deng,Xinhua Lin,Wei Chen,Wensong Yao
Chemiluminescence (CL) intensity of luminol-H 2 O 2 system was dramatically enhanced by cetyltrimethylammonium bromide (CTAB) micelle-mediated 6-aza-2-thiothymine-protected gold nanoclusters (ATT-AuNCs). It is proved that spherical micelles of CTAB in aqueous solution improved the dispersity of ATT-AuNCs, thus enhancing their catalytic activity, which brought in the increased CL intensity of luminol-H 2 O 2 system. Carbazochrome sodium sulfonate (CSS) with a hemostatic containing tetrahydroindole structure broke the spherical micelles and notably quenched the CL intensity of luminol-H 2 O 2 -CTAB-ATT AuNCs system. Based on these results, a simple, fast, and sensitive CL method has been developed for the detection of CSS with a linear range of 0.25–25 μM and a detection limit of 0.11 μM. The method has also been successfully applied to the determination of CSS in serum with satisfied recoveries in the range of 89.6 % to 103.7 %. This study not only provides an effective approach for CSS detection but also paves the way for AuNCs-based CL applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Kang Luo,Wanlin Sun,Yuting Chi,Shuiqin Chai,Chengyu Sun,Wen Wu
Effectively killing microbial pathogens without inducing resistance is a challenge, especially in the treatment of infectious diseases. In this study, sulfur ( S )- and phosphorus (P)-doped carbon quantum dots (CQDs) were synthesized by one-step hydrothermal method using m -aminophenol as carbon source, thiourea and phosphoric acid as S and P dopants, respectively. Compared with S-CQDs, P doping could lead to a red-shift of the maximum emission wavelength. In addition, the as-prepared S-CQDs and S, P-CQDs exhibited unique antibacterial efficacy against both E. coli and S. aureus without developing drug resistance. In contrast, the S, P-CQDs had no preference for Gram-positive and Gram-negative bacteria, and they had a somewhat reduced bactericidal efficacy than that of S-CQDs, but S, P-CQDs had better bacteriostatic stability than S-CQDs. Such an excellent antibacterial effect might be attributed to the generation of a large number of intracellular reactive oxygen species (ROS), which disrupted the structure and the regular surface of bacterial cell. Consequently, the prepared S-CQDs and S, P-CQDs could be applied as antibacterial drugs with broad-spectrum antibacterial activity and without drug resistance.
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Shule Huang,Gui Wang,Xinmiao Xuan,Moran Qin,Jieming Huang,Lirong Wang,Xiaoming Zhang,Nan Wang,Junwei Zhang,Zhipeng Hou,Xingsen Gao,Zhang Zhang,Junming Liu
Piezoelectricity in 2D transition metal dichalcogenides (TMDs) has gathered significant interest due to their massive exposure of unsaturated edge sites and high piezoelectric modulus. Nevertheless, the piezoelectricity in 1 T′ phase TMDs is inhibited by its center symmetry of space group. Herein, to break the shackles of piezoelectric polarization, we synthesize a piezoelectric material composed of an atomic molybdenum array bound to distorted 1 T′ ReS 2 (MDR). The phase transition from 1 T′ to distorted 1 T′ (D-1 T′) removes the special Peierl's distortion of ReS 2 , breaking its center symmetry and allowing for piezoelectric generation. Remarkably, MDR exhibits a large piezoelectric coefficient ( d 33 ) value of 15.45 pm/V, which is an order of magnitude higher than those reported in other TMDs. Combining with excellent piezocatalytic activity, a 0D/3D di-piezoelectric porous electret featuring an enhanced quantum confinement piezoelectric effect based on the MDR quantum dots (QDs) and inverse opal g-C 3 N 4 (IOCN) is demonstrated for high-efficiency piezoelectric catalysis.
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Yanling Jin,Aiyue Sun,Jiahui Geng,Fang Ren,Zhengyan Chen,Lu Pei,Zhenfeng Sun,Yanli Du,Peng-Gang Ren
Nickel cobalt sulfides have exhibited great promise as supercapacitor electrode materials owing to the abundant redox states and considerable theoretical capacities. However, they still suffer from sluggish reaction kinetics, resulting in undesirable capacitance, cyclic and rate performances. Herein, electrochemical exfoliated graphene with high dispensability was utilized as the matrix and uniform nickel‑cobalt sulfide nanorods grown on graphene (Ni-Co-S/G) was achieved by a facile two-step strategy for enhanced capacitive performances. This well-constructed Ni-Co-S/G can provide plentiful active sites for electrochemical reaction , offer more efficient and rapid electron/ion transfer pathways during the charge/discharge process, and the tight contact of nickel‑cobalt sulfide nanorods and graphene can improve the stability. Consequently, the obtained Ni-Co-S/G electrode exhibits a high specific capacity of 1579.68 F g −1 at 1 A g −1 , splendid rate capability (1240 F g −1 at 20 A g −1 ) and excellent cycling stability with capacity retention of 91.5 % after 5000 cycles at 5 A g −1 . Additionally, the assembled asymmetric supercapacitor (ASC) device Ni-Co-S/G//AC with Ni-Co-S/G and commercial active carbon as positive and negative electrode displays an energy density of 75.3 W h kg −1 at the power density of 1125 W kg −1 , still retaining 50.5 Wh kg −1 even at 16.9 kW kg −1 . This work provides a potential strategy to design high-performance nickel‑cobalt sulfides electrode for advanced supercapacitors .
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 13
·2791
·
IF 5
Mingqiang Shao,Yiran Shi,Jiangtao Liu,Baoxia Xue,Mei Niu
Improving the residual char of polypropylene (PP) is difficult due to the preferential complete combustion. Here, we designed a combination catalyst that not only provides physical barrier effects, but also dramatically promotes catalytic charring activity. We successfully synthesized WS2monolayer sheets decorated with isolated Ni atoms that bond covalently to sulfur vacancies on the basal planes via thiourea. Subsequently, PP blends composed of 8 wt.% Ni-decorated WS2, NiO, and activated carbon (AC) were obtained (ENi-SWS2-AC-PP). Combining the physical barrier effects of WS2monolayer sheets with the excellent catalytic carbonization ability of theENi-SWS2-AC combination catalyst, the PP blends showed a remarkable improvement in flame retardancy, with the yield of residual char reaching as high as 41.6 wt.%. According to scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations, it was revealed that the microstructure of residual char contained a large number of carbon nanotubes. The production of a large amount of residual char not only reduced the release of pyrolytic products, but also formed a thermal shield preventing oxygen and heat transport. Compared to pure PP, the peak heat release rate (pHRR) and total heat release rate (THR) ofENi-SWS2-AC-PP were reduced by 46.32% and 26.03%, respectively. Furthermore, benefiting from the highly dispersed WS2, the tensile strength and Young’s modulus ofENi-SWS2-AC-PP showed similar values to pure PP, without sacrificing the toughness.Keywords:polypropylene;Ni-modified monolayer WS2;sulfur vacancy;activated carbon;NiO;carbon nanotubes;flame retardancy;mechanical properties
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Fangwei Qi,Xiaosong Chen,Huixing Li,Gang Chen,Xinrui Luo,Shiyu Xiong,Shuping Peng,Cijun Shuai
Bismuth sulfide (Bi2S3) enabled us to transform light signals into electrical signals via the photoelectric effect, which exhibited tremendous prospects on constructing wireless electrical stimulation for accelerating nerve regeneration. However, too rapid recombination of photogenerated electron–hole pairs weakened its photocurrent. Herein, the Bi2S3/Ti3C2Tx heterojunction was synthesized by in situ growth of Bi2S3 nanoparticles on Ti3C2Tx nanosheets and then mixed with poly-l-lactic acid (PLLA) powder to fabricate the Bi2S3/Ti3C2Tx-PLLA conduit. At the heterojunction interfaces, Ti3C2Tx with a more positive Fermi energy level could form interfacial potential difference with Bi2S3 to promote electron–hole pair separation. Meanwhile, Ti3C2Tx with excellent conductivity could provide channels for photogenerated electron transmission, thus facilitating the generation of the photocurrent. Photoluminescence and electrochemical impedance spectroscopy analysis indicated that electron–hole pair separation and electron transfer were enhanced. As a consequence, under near-infrared light radiation, the output photocurrent of Bi2S3/Ti3C2Tx-PLLA was increased from 0.48 to 1.43 μA compared to that of Bi2S3-PLLA. The enhanced photocurrent effectively promoted the differentiation of rat pheochromocytoma (PC12) into functional neurons by upregulating extracellular Ca2+ influx. Therefore, the above results demonstrated that this work provided a new perspective for wireless electrical stimulated nerve regeneration.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiangbo Feng,Lvwei Sun,Wei Wang,Yuzhen Zhao,Jian-Wen Shi
Photoelectrochemical (PEC) water splitting provides a promising strategy for the production of clean hydrogen fuel. Herein, a new CdS@ZnO core–shell nanorod arrays (NRAs) is successfully constructed by atomic layer deposition (ALD) for H 2 evolution from PEC water splitting. The CdS@ZnO 200 obtained after 200 ALD cycles presents a significantly enhanced PEC H 2 evolution rate of 21.64 μmol·h −1 ·cm −2 , which is about 9.4 times of pristine CdS NRAs (2.31 μmol·h −1 ·cm −2 ). The reasons for the improved PEC H 2 evolution performance can be ascribed to several aspects: firstly, the Z-scheme charge transfer mechanism formed between CdS core and ZnO shell promotes the effective spatial separation of photo-induced electrons and holes; secondly, the close contact between the two semiconductors resulted from ALD process helps to reduce the transfer resistance of charge carriers. In addition, the CdS core is tightly wrapped by ZnO shell, which helps to prevent the photo-corrosion of CdS core. This work provides a new type of photoanode material suitable for PEC H 2 evolution from water splitting, and provides an efficient anti-corrosion method for the use of photocorrosive semiconductor materials.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1064
·
IF 3.9
Yutong Ye,Guorong Zhou,Kaixun Li,Yun Tong
Anion modification and trace metal doping have been widely demonstrated to have unique advantages in regulating both electrocatalytic activity and the electronic structure of non-precious metal materials. Developing a simple and practical preparation strategy is critical, but it still faces challenges. In this paper, a novel type of dual-modification approach is put forward to rationally design the S, Pt-CoNi material, which can be grown directly on the nickel foam (NF) in a one-step electrodeposition process. The multiple advantages of having plenty of active sites, high conductivity, and a faster charge transfer endow the optimized reaction kinetic for HER. The prepared S, Pt-CoNi/NF catalyst displays excellent catalytic performance, and a low overpotential of 116 mV at 50 mA cm−2and a small Tafel slope of 75 mV dec−1are achieved. The coupled S, Pt-CoNi/NF||FeOOH/NF electrolyzer delivers a high current density of 100 mA cm−2at the potential of 1.61 V as well as superior stability under alkaline conditions. Our work experimentally confirms the feasibility of constructing a dual-regulation strategy via one-step electrodeposition, and it also provides ideas for the controllable design of other high-performance electrodes for electrocatalysis.Keywords:dual-modification;CoNi alloy;electrodeposition;electrocatalytic hydrogen production;alkaline medium
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 7
·1-11
·
IF 5.7
Li Yuchen,Xu Guangfu,Chen Jiaquan,Yu Tao,Miao Pandeng,Du Yingxiang
A novel chiral molecularly imprinted polymer TiO 2 nanoparticle was synthesized in one step for the enantioseparation of phenylalanine in coated capillary electrochromatography. To the author’s knowledge, the chiral molecularly imprinted nanomaterials have still not been reported, to date. Chiral molecularly imprinted TiO 2 nanomaterials (L-PHE@MIP(APTES-TEOS)@TiO 2 ) were used as a chiral stationary phase to separate the phenylalanine enantiomers in coated capillary electrochromatography (CEC). The imprinted coating was prepared from L-phenylalanine (L-PHE) as the template, TiO 2 nanoparticles (NPs) as the support substrate, 3-aminopropyltriethoxysilane (APTES) as the functional monomer, and tetraethyl silicate (TEOS) as the cross-linker. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used for the characterization of the L-PHE@MIP(APTES-TEOS)@TiO 2 @capillary. Fourier transform infrared spectra (FT-IR), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA) were employed for the characterization of the L-PHE@MIP(APTES-TEOS)@TiO 2 . The effects of the applied voltage, pH value, buffer concentration, and acetonitrile content were investigated experimentally to determine the optimum conditions for CEC. The best resolution for phenylalanine enantiomers by CEC reached a value of 3.48. In addition, the specific recognition effect of L-PHE@MIP(APTES-TEOS)@TiO 2 on PHE enantiomers was studied by selective experiment. Finally, adsorption kinetic research, adsorption equilibrium isotherm study, and adsorption thermodynamic experiment were carried out to investigate the separation mechanism of PHE enantiomers with the L-PHE@MIP (APTES-TEOS)@TiO 2 @capillary, and the results were consistent with those of CEC experiments. Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Wei Wang,Qinyang Sheng,Guowei Zhi,Yuan Zhao,Ruiyang Qu,Luanhong Sun,Shengli Zhang
Photocatalytic technology based on heterojunction structure has been proved to be an effective way to solve environmental pollution and energy crisis. The effective carrier concentration plays an important role in improving the performance of heterojunction photocatalyst. In this work, CuSbS 2 (CAS)-CdS-ZnO was prepared by simple 3-steps microwave irradiation method to reveal the influence of energy band structure on photocatalytic performance. Adding CdS could regulate band alignment to translate the “cliff-like” conduction band offset of CAS-ZnO to “spike-like”. That could effectively reduce the carrier recombination rate to improve the photocatalytic degradation activity, which could completely degraded Rhodamine B (RhB) after 80 min under a solar simulation, highest rate constant (0.02028 min −1 ) and good stability. Furthermore, the transformation of charge transfer mechanism from the Z-type to Ⅱ-type by adding CdS were confirmed by experiments and density functional theory (DFT) calculations. This change could raise the energy level of photoelectrons, resulting in CAS-CdS-ZnO with a certain photocatalytic hydrogen evolution capacity (42.37 μmol g −1 h −1 ). This work reveals the important role of band structure in photocatalytic properties and applications of heterojunction.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）