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Promoting the Na^(+)-storage of NiCo_(2)S_(4) hollow nanospheres by surfacing Ni-B nanoflakes

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Journal of Materials Science & Technology 2021年第23期82卷 114-121页

作者： Jingfa Li Jian Zhou Qihao Zhou Xin Wang Cong Guo Min Li School of Chemistry and Materials Science Nanjing University of Information Science and TechnologyNanjing210044JiangsuChina jiangsu key laboratory for optoelectronic detection of atmosphere and ocean School of Physics and Optoelectronic EngineeringNanjing University of Information Science and TechnologyNanjing210044JiangsuChina

Sodium ion battery(SIB)is considered as the potential alternative for next generation energy system to succeed the lithium ion battery(LIB)due to the low price and vast abundance of Na *** metal sulfide is identified as an impo rtant redox conversion type of negative electrode for *** this study,amorphous nickel boride(Ni-B)nanoflakes are introduced into the hollow Ni-Co sulfide nanospheres by a facile in situ solution growth route to promote the electrochemical performance of Na^(+)-*** measurements demonstrate that the Ni-B component could effectively improve the redox kinetics of the conversion reaction and structural stability during long-term Na^(+)insertion/*** example,the NiCo_(2)S_(4)@Ni-B composites display a high reversible capacity of 251.9 mA h g^(-1)at the current density of 1.0 A g^(-1)after 200 cycles,much higher than that of bare NiCo_(2)S_(4)(37.4 mA h g^(-1)at 1.0 A g^(-1)after 200 cycles).As a consequence,these results demonstrate a new sight to explore heterostructures of mixed metal-sulfides electrode materials with superior Na^(+)-storage performances.

关键词： Surface growth Ternary metal sulfides Redox kinetics Sodium ion battery

Catalyzing the polysulfide conversion for promoting lithium sulfur battery performances:A review

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Journal of Energy Chemistry 2021年第3期30卷 434-451页

作者： Jingfa Li Zhihao Niu Cong Guo Min Li Weizhai Bao School of Chemistry and Materials Science Nanjing University of Information Science and TechnologyNanjing 210044JiangsuChina jiangsu key laboratory for optoelectronic detection of atmosphere and ocean School of Physics and Optoelectronic EngineeringNanjing University of Information Science and TechnologyNanjing 210044JiangsuChina

Lithium-sulfur batteries(LSBs)are being recognized as potential successor to ubiquitous LIBs in daily life due to their higher theoretical energy density and lower cost ***,the development of the LSB is beset with some tenacious issues,mainly including the insulation nature of the S or Li_(2)S(the discharged product),the unavoidable dissolution of the reaction intermediate products(mainly as lithium polysulfides(LiPSs)),and the subsequent LiPSs shuttling across the separator,resulting in the continuous loss of active material,anode passivation,and low coulombic *** methods by introducing the high-electrical conductivity host are commonly used in improving the electrochemical performances of ***,such prevalent technologies are in the price of reduced energy density since they require more addition of amount of host *** trace of catalysts that catalyze the redox reaction between S/Li_(2)S and Li_(2)Sn(3

关键词： Catalyst Kinetics Shuttle effect Polysulfide conversion Lithium sulfur battery

Secondary electron emission and photoemission from a negative electron affinity semiconductor with large mean escape depth of excited electrons

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Chinese Physics B 2023年第4期32卷 677-690页

作者：谢爱根董红杰刘亦凡 School of Physics and optoelectronic Engineering Nanjing University of Information Science and TechnologyNanjing 210044China jiangsu key laboratory for optoelectronic detection of atmosphere and ocean Nanjing University of Information Science&TechnologyNanjing 210044China jiangsu international Joint laboratory on Meteorological Photonics and optoelectronic detection Nanjing University of Information Science&TechnologyNanjing 210044China

The formulae for parameters of a negative electron affinity semiconductor(NEAS)with large mean escape depth of secondary electrons A(NEASLD)are *** methods for obtaining parameters such asλ,B,E_(pom)and the maximumδandδat 100.0 keV≥E_(po)≥1.0 keV of a NEASLD with the deduced formulae are presented(B is the probability that an internal secondary electron escapes into the vacuum upon reaching the emission surface of the emitter,δis the secondary electron yield,E_(po)is the incident energy of primary electrons and E_(pom)is the E_(po)corresponding to the maximumδ).The parameters obtained here are analyzed,and it can be concluded that several parameters of NEASLDs obtained by the methods presented here agree with those obtained by other *** relation between the secondary electron emission and photoemission from a NEAS with large mean escape depth of excited electrons is investigated,and it is concluded that the presented method of obtaining A is more accurate than that of obtaining the corresponding parameter for a NEAS with largeλ_(ph)(λ_(ph)being the mean escape depth of photoelectrons),and that the presented method of calculating B at E_(po)>10.0 keV is more widely applicable for obtaining the corresponding parameters for a NEAS with largeλ_(ph).

关键词： negative electron affinity semiconductor secondary electron emission photoemission the probability secondary electron yield large mean escape depth of excited electrons

Secondary electron emission model for photo-emission from metals in the vacuum ultraviolet

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Nuclear Science and Techniques 2022年第8期33卷 89-105页

作者： Ai-Gen Xie Yi-Fan Liu Hong-Jie Dong School of Physics and optoelectronic Engineering Nanjing University of Information Science&TechnologyNanjing 210044China jiangsu key laboratory for optoelectronic detection of atmosphere and ocean Nanjing University of Information Science&TechnologyNanjing 210044China jiangsu International Joint laboratory on Meteorological Photonics and optoelectronic detection Nanjing University of Information Science&TechnologyNanjing 210044China

This study investigates two secondary electron emission(SEE)models for photoelectric energy distribution curves f(E_(ph),hγ),B,E_(mean),absolute quantum efficiency(AQE),and the mean escape depth of photo-emitted electronsλof *** proposed models are developed from the density of states and the theories of photo-emission in the vacuum ultraviolet and SEE,where B is the mean probability that an internal photo-emitted electron escapes into vacuum upon reaching the emission surface of the metal,and E_(mean)is the mean energy of photo-emitted electrons measured from *** formulas for f(E_(ph),hγ),B,λ,E_(mean),and AQE that were obtained were shown to be correct for the cases of Au at hγ=8.1–11.6 eV,Ni at hγ=9.2–11.6 eV,and Cu at hγ=7.7–11.6 *** photoelectric cross sections(PCS)calculated here are analyzed,and it was confirmed that the calculated PCS of the electrons in the conduction band of Au at hγ=8.1–11.6eV,Ni at hγ=9.2–11.6 eV,and Cu at hγ=7.7–11.6 eV are correct.

关键词： Absolute quantum efficiency Photoelectric cross section Mean escape depth of photo-emitted electrons Probability Photo-emission from metals Secondary electron emission Vacuum ultraviolet Mean energy of photo-emitted electrons

Evolutionary Plasmonic Properties of Single Truncated Ag Nanowire-on-Au Film Nanocavity

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Chinese Physics Letters 2023年第5期40卷 104-108页

作者：朱鑫张静云杨翠红李莹陈云云 School of Physics&optoelectronic Engineering Nanjing University of Information Science and TechnologyNanjing 210044China jiangsu key laboratory for optoelectronic detection of atmosphere and ocean Nanjing University of Information Science and TechnologyNanjing 210044China jiangsu International Joint laboratory on Meterological Photonics and optoelectronic detection Nanjing University of Information Science and TechnologyNanjing 210044China

Noble metal nanocavities have been widely demonstrated to possess great potential applications in nanooptics and nanophotonics due to their extraordinary localized surface plasmon ***,most metal nanocrystals synthesized by chemical methods often suffer from truncation with different degrees due to oxidation and dissolution of metal atoms at corner and *** investigate the influence of shape truncation on the plasmonic properties of single Ag nanowire on Au film nanocavity using the finite difference time domain *** the Ag nanowire(the circumradius R_(2)=50 nm)is gradually truncated from pentagonal to circular geometry,the scattering peak position of the nanocavity shows prominent blue shift from 962 nm to 608 nm,suggesting a nonnegligible role of truncation on plasmonic *** electric field strength and charge distribution of the structure reveal the evolution from dipole mode to quadrupole *** is also found that the plasmon resonance wavelength is linearly dependent on the truncation ratio R_(1)/R_(2)(R_(1) is the inradius)and the modulation slope is also reliable to the size of Ag *** observations could shed light on developing high-performance tunable optical nano-devices in future.

关键词： cavity truncation radius

Molecular Spectra and Dissociation Dynamics of Oxalyl Chloride: Effect of External Electrical Fields

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Chinese Journal of Structural Chemistry 2019年第4期38卷 499-508页

作者： YIN Wen-Yi LIU Yu-Zhu ZHOU Feng-Bin BUMALIYA Abulimiti jiangsu key laboratory for optoelectronic detection of atmosphere and ocean Nanjing University of Information Science & Technology jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology College of Physics and Electronic Engineering Xinjiang Normal University

Oxalyl chloride is a highly toxic and caustic substance, which widely exists in human production and life as a kind of volatile organic compound. Based on the density functional theory B3 LYP at 6-311++G(d, p) level, the influences of external electric field on the bond length, bond energy, dipole moment and dissociation mechanism are optimized. The results indicate that the C_1–Cl_3 bond length increases while the C_4–Cl_6 bond decreases. At the same time, the carbon-carbon bond length gradually increases with the increase of electric field. The total energy decreases while the dipole moment gradually increases with the increase of electric field. In the infrared spectra, the vibration frequency of the carbon-chlorine(C_4–Cl_6) bond decreases while the vibration frequency of the carbon-oxygen bond increases. In the ultraviolet-visible spectra, the wavelength of the strongest absorption peak increases as the external electric field increases and shows an observable red shift phenomenon. Additionally, single point energies of oxalyl chloride along the carbon-carbon bond are scanned with the equation-of-motion coupled cluster method restricted to single and double excitations(EOM-CCSD) method and the potential energy curves under different external electric fields are obtained. The dissociation barrier in potential energy curve decreases because of the breakage of carbon-carbon bond with the increase of external electric field. These results provide reference for further researches on the properties of oxalyl chloride and offer a theoretical basis for the study of oxalyl chloride degradation.

关键词： oxalyl chloride spectra electric field density functional theory degradation

A Perfect Graphene Absorber with Waveguide Coupled High-Contrast Gratings

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Chinese Physics Letters 2018年第3期35卷 101-105页

作者：张皓景郑改革陈云云邹秀娟徐林华 jiangsu key laboratory for optoelectronic detection of atmosphere and ocean Nanjing University of Information Science & Technology School of Physics and optoelectronic Engineering Nanjing University of Information Science & Technology jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science & Technology

To achieve the enhancement and manipulation of light absorption in graphene within the visible and near infrared regions, a design consists of high-contrast gratings and two evanescently coupled slabs with graphene monolayer is demonstrated. The operation principle and design process of the proposed structure are analyzed using the coupled mode theory, which is confirmed by the rigorous coupled wave analysis. It is proved that the absorptance of graphene monolayer can be greatly enhanced to unity. The thickness of grating and slab layers can significantly change the line width and resonant mode position in the absorption spectra. Furthermore, high tunability in amplitude and bandwidth of the absorption spectra can be achieved by controlling the structural parameters of the hybrid structure. The proposed devices could be efficiently exploited as tunable and selective absorbers, and could be allowed to realize other two-dimensional materials-based selective photo-detectors.

关键词： A Perfect Graphene Absorber with Waveguide Coupled High-Contrast Gratings

Omnidirectional and compact Tamm phonon-polaritons enhanced mid-infrared absorber

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Chinese Physics B 2021年第8期30卷 360-363页

作者： Xiaomin Hua Gaige Zheng Fenglin Xian Dongdong Xu Shengyao Wang jiangsu key laboratory for optoelectronic detection of atmosphere and ocean School of Physics and Optoelectronic EngineeringNanjing University of Information Science and TechnologyNanjing 210044China jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology(CICAEET) Nanjing University of Information Science and TechnologyNanjing 210044China

Narrow band mid-infrared(MIR)absorption is highly desired in thermal emitter and sensing *** theoretically demonstrate that the perfect absorption at infrared frequencies can be achieved and controlled around the surface phonon resonance frequency of silicon carbide(SiC).The photonic heterostructure is composed of a distributed Bragg reflector(DBR)/germanium(Ge)cavity/SiC on top of a Ge ***-wave simulation results illustrate that the Tamm phonon-polaritons electric field can locally concentrate between the Ge cavity and the SiC film,contributed to the improved light-phonon interactions with an enhancement of light *** structure has planar geometry and does not require nano-patterning to achieve perfect absorption of both polarizations of the incident light in a wide range of incident *** absorption lines are tunable via engineering of the photon band-structure of the dielectric photonic nanostructures to achieve reversal of the geometrical phase across the interface with the plasmonic absorber.

关键词： perfect absorption surface phonon polaritons mid-infrared distributed Bragg reflector

Confinement of Bloch surface waves in a graphene-based one-dimensional photonic crystal and sensing applications

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Chinese Physics B 2018年第5期27卷 198-203页

作者： Xiu-Juan Zou Gai-Ge Zheng Yun-Yun Chen jiangsu key laboratory for optoelectronic detection of atmosphere and ocean Nanjing University of Information Science ＆ Technology Nanjing 210044 China School of Physics and optoelectronic Engineering Nanjing University of Information Science ＆ Technology Nanjing 210044 China jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology （CICAEET） Nanjing University of Information Science ＆ Technology Nanjing 210044 China

Bloch surface waves（BSWs） are excited in one-dimensional photonic crystals（Ph Cs） terminated by a graphene monolayer under the Kretschmann configuration. The field distribution and reflectance spectra are numerically calculated by the transverse magnetic method under transfer-matrix polarization, while the sensitivity is analyzed and compared with those of the surface plasmon resonance sensing method. It is found that the intensity of magnetic field is considerably enhanced in the region of the terminated layer of the multilayer stacks, and that BSW resonance appears only in the interface of the graphene and solution. Influences of the graphene layers and the thickness of a unit cell in Ph Cs on the reflectance are studied as well. In particular, by analyzing the performance of BSW sensors with the graphene monolayer,the wavelength sensitivity of the proposed sensor is 1040 nm/RIU whereas the angular sensitivity is 25.1°/RIU. In addition,the maximum of figure of merit can reach as high as 3000 RIU^-1. Thus, by integrating graphene in a simple Kretschmann structure, one can obtain an enhancement of the light–graphene interaction, which is prospective for creating label-free,low-cost and high-sensitivity optical biosensors.

关键词： optical sensor Bloch surface wave (BSW) photonic crystal (PhC)