Plasmonics
·
2015
·Vol. 11
·期 3
·909-915
·
IF 2.238
Wang Shuxia,Wang Hui,Liu Ting,Huang Yingzhou,Chen Guo,Wei Hua,Su Xun,Zeng Xiping,Xia Zengzilu,Wen Weijia,Sun Mengtao
In the propagating process along metal surface, surface plasmon polaritons (SPPs) mainly decay into thermal loss or release into photons, while a part of them were converted into electrons with high energy termed as hot electrons, which have great significance in photonics and electronics. In this work, the generation of plasmonic hot electrons was ascertained in the nanoparticle-film system through plasmon-driven surface catalysis (PDSC) reactions. The surface-enhanced Raman scattering (SERS) spectra of p,p'-dimercaptoazobenzene (DMAB) catalyzed by 4-nitrobenzenethiol (4NBT) experimentally demonstrated the essential catalysis electrons were generated in this hybrid plasmon mode. The results pointed out the priority of plasmonic hot electron generation in the dimer-film gap compared to the monomer-film gap which was analyzed by the surface electric and charge distribution. Furthermore, the SERS spectra of 4NBT in the metal nanoparticle-dielectric film system confirmed the necessity of hybrid plasmon mode in the generation of plasmonic hot electrons in the nanoparticle-film system. Because of the simple configuration and convenient fabrication of nanoparticle-film system, the work on this hybrid plasmon mode has a significant role in promoting the application of plasmonic hot electrons.
研究领域:
纳米光子学
·
等离激元学
·
表面科学
·
催化化学
·
分子光学
·
材料物理
·
半导体器件
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Qi Jin,Kaixin Zhao,Xitian Zhang
The lithium–sulfur (Li–S) battery is an appealing choice for the next-generation high-energy-density energy storage systems . However, side reactions between lithium polysulfides (LiPSs) and Li metal anode cause the growth of Li dendrites, loss of active materials, and safety issues, which severely hinders the practical application of Li–S batteries. Constructing a protection layer on the surface of Li anode is an effective strategy to shield LiPSs and regulate lithium uniform deposition in Li–S batteries. Herein, we design and fabricate a lithiated Nafion protective layer to alleviate the side reactions between LiPSs and the Li anode and guide uniform deposition of Li, in which, their mechanism is investigated. The optimal protective layer effectively protects the Li anode from the detrimental side reactions, which boosts the stability of the Li anode. Li–Li and Li-stainless steel cells with 4 M [S] Li 2 S 8 electrolyte can last for more than 400 cycles and 100 cycles at current density of 1 mA cm −2 . A Li–S full cell also exhibits a high reversible capacity of 791.5 mA h g −1 after 250 cycles at 0.5 C. This work reveals the vital role of the artificial protective layer in enhancing the stability of the Li anode in Li–S batteries.
研究领域:
电化学
·
能源材料
·
电化学储能
·
电池技术
·
界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Jianfeng Li,Shujuan Guo,Zhaozan Xu,Jianguo Li,Zihe Pan,Zhiping Du,Fangqin Cheng
In order to reduce the wetting and fouling propensity of polyvinylidene fluoride (PVDF) membrane during coking wastewater treatment by membrane distillation, two kinds of omniphobic PVDF composite membranes were prepared by coating SiO 2 nanoparticles on PVDF membrane surface via electrostatic adsorption or chemical bonding respectively, and subsequently fluorination. The coated SiO 2 nanoparticles observed as amounts of nano-scale protrusions by scanning electron microscope constructed a re-entrant structure and enhanced membrane surface roughness . The omniphobicity of the modified membranes was confirmed by high contact angles (> 150°) for water, diiodomethane and ethylene glycol on the membrane surface. The omniphobic layer with SiO 2 nanoparticles coated via chemical bonding was more stable than electrostatic adsorption. Both the omniphobic PVDF membranes exhibited stable and high rejections of the inorganic and organic contaminants, which were determined by conductivity, total organic carbon and three-dimensional excitation-emission fluorescence spectroscopy of the distillate. The modified omniphobic membranes also showed much less flux decline than the pristine PVDF membrane in direct contact membrane distillation tests (120 h), suggesting their excellent anti-fouling performance. This study indicates that coating silica nanoparticles via chemical bonding is an effective and promising method to fabricate omniphobic PVDF membrane for coking wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Xingyun Hu,Xianjia Peng,Linghao Kong,Feng Zhu
The most toxic and mobile form of vanadium (V) is V(V). Thus, the oxidation of V is a subject of considerable importance since the process may increase environmental risks of V. V(IV) is known to be stable when pH < 4.5. However, in this study, stable V(IV) was oxidized almost completely in goethite suspension within 60 min at pH 2.0 and pH 4.0, correspondingly, only 25%–30% and 15%–20% of V(IV) were oxidized in equimolar Fe 3+ solution and the blank solution, respectively. The promoted oxidation of V(IV) by FeOOH is attributed to the formation of the complex, VO(OFe<) + or VO(OFe<) 2 . On the one hand, the formation of the complex caused higher pH in the interface of solid FeOOH and corresponding lower conditional potential of V(V)/V(IV) than those in bulk solutions, which facilitates the oxidation of V(IV). On the other hand, the surface group OFe < may serve as a medium that facilitating the electron transfer from V(IV) ions to dissolved oxygen molecules, also favoring the oxidation of V(IV). This study not only deepens our understanding of the transfer, transformation, and risk of V in environments, but also provides a reference to speculate the fate of similar elements in environments.
研究领域:
环境化学
·
地球化学
·
水污染控制
·
金属形态转化
·
界面过程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 6
·6968-6975
·
IF 5.1
Xinrong Yang,Deqin Chen,Guobin Zhu,Siyu Xiong,Xiaowei Zhu,Laijun Liu,Chunchun Li
The impact of configurational entropy on the microwave dielectric properties of LnNbO 4 fergusonite was investigated by designing a series of high-entropy counterparts, including (La, Nd, Sm, Ho, Yb, Y)NbO 4 (6RNO), (La, Nd, Sm, Eu, Ho, Yb, Y)NbO 4 (7RNO), (La, Nd, Sm, Eu, Gd, Ho, Yb, Y)NbO 4 (8RNO), and (La, Nd, Sm, Eu, Gd, Ho, Tm, Yb, Lu, Y)NbO 4 (10RNO). Simply prepared by the solid-state route, a pure phase with a monoclinic fergusonite structure of space group C /2 c was obtained. By comparing the microstructural evolution and lattice vibration modes, an analysis was conducted on the variations in microwave dielectric performances. It was confirmed that the permittivity ( ε r ) is primarily influenced by relative density, while the quality factor ( Q × f ) exhibits a strong correlation with packing fraction and lattice vibrations. The resonant frequency temperature coefficient (τ f ) is significantly associated with bond valence. The optimal microwave dielectric properties were achieved in 7RNO ceramics at a temperature of 1270 °C, resulting in a relative density of 95.43 %. The microwave dielectric properties were measured as ε r = 18.62, Q × f = 35200 GHz, τ f = −23.28 ppm/°C. The present study expands the application of entropy engineering to achieve ultrahigh configurational entropy in microwave dielectric ceramics . These findings demonstrate that optimizing the configuration entropy is an effective approach for manipulating the dielectric properties, thereby providing valuable insights for material component design.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
介电材料
·
固态化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Yanru Yin,Ning Ma,Jing Xue,Guoqiang Wang,Shuibo Liu,Hongliang Li,Peizhi Guo
Four types of palladium (Pd) nanoparticles were prepared from the systems containing PdCl2 or Na2PdCl4 with or without the assistance of poly(vinylpyrrolidone) (PVP). Two types of Pd nanoparticles obtained in the absence of PVP were obviously larger than those synthesized with the assistance of PVP. The former large Pd particles showed typical features in cyclic voltammetry in H2SO4 solution, whereas two types of small Pd nanoparticles did not. However, small nanoparticles treated first in an electrochemical way in 0.5 M KOH solution displayed the adsorption and desorption peaks similar to those of typical Pd-modified electrodes in H2SO4 solution. Large Pd nanoparticles from the PdCl2 synthesis system showed a catalytic specific current of 629 mA/mg in the electrocatalysis of ethanol, whereas large particles from the Na2PdCl4 system showed a current of 262 mA/mg. The maximum catalytic currents of small Pd nanoparticles without surface cleaning treatment were 1382 and 1019 mA/mg for samples from the Na2PdCl4 and PdCl2 systems, respectively, higher than those being treated in KOH solution first, and the electrocatalytic stability of the two untreated samples was better. However, small nanoparticles after the electrochemical treatment can reach the maximum catalytic current faster. The synthesis and structure–property relation of four types of Pd nanoparticles have been discussed and analyzed on the basis of systematically experimental data.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhiwei Wang,Hongfeng Yin,Yun Tang,Qin Hou,Chen He,Hudie Yuan
Herein, we constructed an ordered nanoporous embedding nanoparticles composite by anodic oxidation of Ti 3 SiC 2 in fluorine containing organic electrolyte. Compared to anodized Ti which resulted in TiO 2 nanotubes , the anodized Ti 3 SiC 2 (ATSC) led to the formation of nanostructured TiO 2 /C/SiO 2 composite. The morphologies of oxides in the composite also varied with different anodization parameters. The ATSC could be directly used as an electrode without further processes, which possessed a superior structure and composition with a visible-light photocurrent density of 7.56 μA cm −2 , initial reversible area capacity of 6.18 F cm −2 , which were respectively 1.32 and 6.87 times higher than those of the anodized Ti (AT), respectively. The ATSC synthesized by such a feasible fabricating strategy shows favorable photoelectrochemical properties and remarkable stability, and may broaden the bifunctional material prospects of anodized MAX phases.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 10
·9983-9988
·
IF 2.195
Ma Panfei,Zhang Huimin,Chen Mingxing,Liu Ting,Chang Aimin,Su Zhi
Highly dense LaCrO 3 negative temperature coefficient (NTC) thermistor ceramics by low-heating solid-state method have been successfully synthesized in air ambient. The X-ray diffraction analysis has shown that both of the calcined powders and as-sintered ceramics crystallize in a perovskite structure. The relative densities of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 91% and 65%, respectively. The relationship between lnρ and 1000/T shows an approximate line in the measured temperature range. The values of ρ 25 and B 0/25 of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 424.8 Ω cm, 3252 K and 1835.9 Ω cm, 3636 K, respectively.
研究领域:
材料科学
·
无机非金属材料
·
电子陶瓷
·
热敏材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Chenhu Zhang,Sun Wei,Yuehua Hu,Honghu Tang,Jiande Gao,Zhigang Yin,Qingjun Guan
Selective adsorption of tannic acid (TA) on calcite surfaces and the implications of this process for the separation of fluorite ore were studied by microflotation tests, surface adsorption experiments, zeta potential measurements, UV–vis analysis, and X-ray photoelectron spectroscopy (XPS) analysis. The microflotation tests indicated that TA, when added before sodium oleate (NaOl), could selectively depress calcite from fluorite at pH 7. Surface adsorption experiments revealed that TA hinders the interaction of NaOl with calcite. The zeta potential of calcite became more negative with TA than with NaOl. However, the characteristic features of TA adsorption were not observed on fluorite, suggesting that the dominant adsorption sites are dissimilar on the fluorite and calcite surfaces in the pulp. UV–vis spectroscopy, XPS, and solution chemistry analysis were utilized to obtain a better understanding of the mechanism for selective adsorption of TA as well as the key factors determined by the Ca 2+ and Ca(OH) + components on the mineral surfaces. A possible adsorption mechanism along with an adsorption mode is proposed for the surface interaction between TA and calcite.
研究领域:
矿物加工工程
·
表面化学
·
胶体与界面科学
·
资源利用
·
浮选化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Lu Shen,Yong Li,Wenjie Zhao,Lijing Miao,Weiping Xie,Huanming Lu,Kui Wang
In order to hold the excellent corrosion resistance of zinc-rich epoxy coatings with reduced zinc content, five types of graphene modified zinc-rich epoxy coatings (G-ZRCs) were prepared. The effect of zinc content on the corrosion protection behaviors of G-ZRCs was investigated using electrochemical impedance spectroscopy (EIS). Open circuit potential (OCP) was also utilized to deepen the understanding of the anticorrosion mechanism of the as-prepared composite coatings. The results confirmed that addition of 0.3 wt % graphene could make the coating with 40 wt % (G-40ZRC) and 55 wt % zinc (G-55ZRC) provide cathodic protection for a short period of time. The EIS and OCP results showed a dominant physical barrier protection mechanism for the coatings without zinc (G-ZRC), while there was a mixed mechanism for G-40ZRC and G-55ZRC and a dominant cathodic protection mechanism for the coatings with 70 and 85 wt % zinc (G-70ZRC and G-85ZRC). Furthermore, the graphene modified zinc-rich coatings and corresponding corrosion products immersed in a 3.5% NaCl solution for 100 days were also characterized, which could further reveal anticorrosion mechanisms of the graphene modified zinc-rich coatings and the passivation effect of polyaniline (PANI).
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 20
·8642-8650
·
IF 3.553
Chen Shaoping,Xu Libin,Li Rong,Fan Wenhao,Chen Yanzuo,An Decheng,Wang Wenxian,Wu Yucheng
Energy filtering effect is helpful to decouple Seebeck coefficient and electric conductivity, and dopant is helpful for improving conductivity; in this work, synergetic function of both is supposed to enhance zT values of tellurium.
In bulk Te and Sb 0.003 Te 0.997 , the Ni/Te heterojunction was built by electroless plating combined with spark plasma sintering. The Ni/Te interface barrier successfully decoupled the relationship between the Seebeck coefficient and the electrical resistivity. The Seebeck coefficient and resistivity of Ni/Te samples increased by 37.9% and decreased by 28.1%, respectively. Meanwhile, the thermal conductivity of the Ni/Te samples decreased by 25.8% (T = 300 K), and the zT value was increased by 36.4% compared to the pure Te sample. Consequently, a peak zT of 0.96 at 550 K is achieved in 18wt %Ni/Sb 0.003 Te 0.997 sample,which is 50% higher than Sb 0.003 Te 0.997 samples. This work indicates that electroless plating combined with spark plasma sintering is an effective method to construct heterojunction in bulk materials. This method should be widely applicable to various materials for achieving better thermoelectric properties.
研究领域:
材料科学
·
凝聚态物理
·
能源材料
·
半导体物理
·
热电转换
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 26
·期 1
·263-272
·
IF 2.289
Luo X. Y.,Meng B.,Xia Z. D.,Chen Q. B.,Dong D. Z.,Zhao M. Y.
In order to investigate the effects of Na 2 CO 3 /ZnO co-addition on the sinterability and electrical conductivity of BaZr 0.1 Ce 0.7 Y 0.1 Sc 0.1 O 3-δ (BZCYSc) ceramic, Na 2 CO 3 and ZnO were added and BZCYSc/ZnO/Na 2 CO 3 ceramic was prepared by mechanical ball milling and high-temperature sintering in air. The crystalline structure, micro-morphology, chemical composition, density, and electrical conductivity of the sintered ceramics were characterized by XRD, SEM, EDS, Archimedes method, and electrochemical impedance spectrum, respectively. The grains size of BZCYSc-2%ZnO-5%Na 2 CO 3 is about 2.5~5 μm. Na 2 CO 3 /ZnO co-addition is beneficial to improve the sinterability and electrical conductivity of BZCYSc. The sintering temperature of BZCYSc can be lowered from 1550 to 1350 °C when 2 mol%ZnO is added. At 550 °C, the electrical conductivities of BZCYSc-2%ZnO-10%Na 2 CO 3 and BZCYSc are 1.90 × 10 −3 S/cm and 1.81 × 10 −3 S/cm. The activation energies of BZCYSc and BZCYSc-2%ZnO-10%Na 2 CO 3 are 0.7529 eV and 0.5641 eV, respectively.
研究领域:
材料科学
·
无机非金属材料
·
固态离子学
·
能源材料
·
陶瓷工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）