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P-V Criticality of an AdS Black Hole in f(R)Gravity

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Chinese Physics Letters 2013年第6期30卷 38-41页

作者： CHEN Song-Bai LIU Xiao-Fang LIU Chang-Qing Institute of Physics and Department of Physics Hunan Normal UniversityChangsha 410081 Key laboratory of Low Dimensional quantum structures and quantum Control Ministry of EducationHunan Normal UniversityChangsha 410081

We study the thermodynamics of a charged AdS black hole in the special f(R)correction with the constant Ricci scalar *** results show that the f(R)correction influences the Gibbs free energy and the phase transition of *** ratioρc occurring at the critical point increases monotonically with the derivative term f'(R0).We also disclose that the critical exponents are the same as those of the liquid-gas phase transition in the van der Waals model,which does not depend on the f(R)correction considered here.

关键词： correction (R) critical

Development prospects of metal-based two-dimensional nanomaterials in lithium-sulfur batteries

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Chinese Chemical Letters 2023年第1期34卷 102-113页

作者： Yuxue Mo Liling Liao Dongyang Li Rongwu Pan Yanhong Deng Yanliang Tan Haiqing Zhou College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China Key laboratory of Low-Dimensional quantum structures and quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Hunan Joint International laboratory of Advanced Materials and Technology for clean energy Changsha 410082China Hunan Shengli High-tech energy Technology Co. Ltd.Yongzhou 425000China Hunan Provincial Key laboratory of Intelligent Information Processing and Application Hengyang 421002China

A lithium-sulfur(Li-S)system is an important candidate for future lithium-ion system due to its low cost and high specific theoretical capacity(1675 m Ah/g,2600 Wh/kg),which is greatly hindered by the poor conductivity of sulfur,large volume change and dissolution of lithium ***-dimensional(2D)materials with monolayers or few-layers usually have peculiar structures and physical/chemical properties,which can resolve the critical issues in Li-S ***,the metal-based 2D nanomaterials,including ferrum,cobalt or other metal-based composites with various anions,can provide high conductivity,large surface area and abundant reaction sites for restraining the diffusion for lithium *** this mini-review,we will present an overview of recent developments on metal-based 2D nanomaterials with various anions as the electrode materials for Li-S *** the main bottleneck for the Li-S system is the shuttle of polysulfides,emphasis is placed on the structure and components,physical/chemical interaction and interaction mechanisms of the 2D ***,the challenges and prospects of metal-based 2D nanomaterials for Li-S batteries are discussed and proposed.

关键词： Lithium-sulfur battery Two-dimensional materials Cathode materials Anode materials Anode protection

SiO2 passivation layer grown by liquid phase deposition for silicon solar cell application

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Frontiers in energy 2017年第1期11卷 52-59页

作者： Yanlin CHEN Sihua ZHONG Miao TAN Wenzhong SHEN Institute of Solar energy and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Surface passivation is one of the primary requirements for high efficient silicon solar cells. Though the current existed passivation techniques are effective, expensive equipments are required. In this paper, a comprehensive understanding of the SiO2 passivation layer grown by liquid phase deposition （LPD） was presented, which was cost-effective and very simple. It was found that the post-annealing process could significantly enhance the passivation effect of the LPD SiO2 film. Besides, it was revealed that both chemical passivation and field-effect passivation mechanisms played important roles in outstanding passivation effect of the LPD SiO2 film through analyzing the minority carrier lifetime and the surface recombination velocity of n-type and p-type silicon wafers. Although the deposition parameters had little influence on the passivation effect, they affected the deposition rate. Therefore, appropriate deposition para- meters should be carefully chosen based on the compromise of the deposition rate and fabrication cost. By utilizing the LPD SiO2 film as surface passivation layer, a 19.5%-efficient silicon solar cell on a large-scale wafer （156 mm × 156 mm） was fabricated.

关键词： Si solar cell passivation SiO2 liquid phasedeposition carrier lifetime

Single-phase bimetal sulfide or metal sulfide heterojunction:Which one is better for reversible oxygen electrocatalyst?

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Journal of energy Chemistry 2022年第11期31卷 420-428,I0012页

作者： Jingjing Cai Huijun Liu Yulin Luo Yuqing Xiong Lizhu Zhang Sheng Wang Kang Xiao Zhao-Qing Liu School of Chemistry and Chemical Engineering/Institute of clean energy and Materials/Key laboratory for clean energy and Materials Guangzhou UniversityGuangzhou 510006GuangdongChina Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA

Bimetallic sulfides,integrating the merits of individual components,are ideal structures for efficient ***,for bimetallic sulfides including metal sulfide heterojunctions(MSH)and singlephase bimetallic sulfides(SBS),it is still unclear about which one has better catalytic activity toward reversible oxygen catalysis and its difference on catalytic *** this work,we demonstrate a bimetallic sulfide electrocatalyst that could transform from metal sulfide heterojunction(CoS/FeS)to single-phase bimetallic sulfide(CoFeS_(2))through a facile temperature control *** single-phase bimetallic sulfide(CoFeS_(2))affords high intrinsic activity,fast reaction kinetics and superior durability toward oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).Density functional theory(DFT)simulations reveal that the(CoFeS_(2))has homogeneous electron distribution of the CoFeS_(2)structure,improves the central energy level of d band,and optimizes the O*and OOH*intermediate and efficiently reduces the energy barrier of the reaction rate-determining step(RDS).The assembled rechargeable zincair battery is more stable than the Pt/C and IrO_(2) assemblies due to the excellent electrocatalytic activity and stability of CoFeS_(2)/NC,suggesting that it has potential for use in practical applications.

关键词： Metal sulfide Sulfide heterojunction OER ORR Zinc-air batteries

Engineering N3C vacancies in hierarchical porous carbon nitride nanosheets for room temperature ultradeep photocatalytic aerobic oxidative desulfurization

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Science China Chemistry 2025年

作者： Yina Nie Weijie Yang Xin Wang Xiang Li Lele Wei Xiaolin Bai Lin Liu Feng Fu Jun Wan College of Chemistry & Chemical Engineering Research Institute of Comprehensive Energy Industrial Technology Shaanxi Key Laboratory of Chemical Reaction Engineering Yan'an University Anhui Engineering Research Center of Carbon Neutrality College of Chemistry and Materials Science Anhui Normal University

The production of ultra-low sulfur clean fuels holds global significance for improving energy efficiency and reducing environmental pollution. Photocatalytic aerobic oxidative desulfurization（PODS） offers an attractive approach to efficiently remove refractory heterocyclic aromatic sulfur compounds under mild conditions. However, the sluggish charge dynamics,insufficient molecule activation, and slow mass transfer within photocatalysts restrict the overall desulfurization efficiency,hindering the widespread application of this technology. Herein, we developed a defective g-C3N4（M1U3CN） photocatalyst with bridged N3Cvacancies and hierarchical porous structures to address these limitations. This catalyst not only demonstrates outstanding dibenzothiophene（DBT） removal efficiency of 99.6% for model oil with high conversion and selectivity but also achieves complete sulfur removal from gasoline as well as 96.7% sulfur removal for distilled diesel at room temperature,successfully achieving ultradeep aerobic oxidative desulfurization. The introduction of rich N3Cvacancies and abundant micromeso-macroporous distribution in M1U3CN enhances kinetic efficiencies by promoting charge carrier separation, mass transfer,and molecular activation simultaneously; resulting in exceptional PODS performance. This work provides a collaborative strategy to overcome kinetic challenges in aerobic oxidative desulfurization via defect and structural engineering of the catalyst.

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Transitional phenomenon of particle dispersion in gas-solid two-phase flows

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Chinese Science Bulletin 2007年第3期52卷 408-417页

作者： LUO Kun FAN JianRen CEN KeFa State Key laboratory of clean energy Utilization Zhejiang University Hangzhou 310027 China

Without using any turbulent model, direct numerical simulation of a three-dimensional gas-solid two-phase turbulent jet was performed by finite volume method. The effects on dispersion of particles with different Stokes numbers by the transitional behavior of turbulent structures were investigated. To produce high-resolution results and reduce the computation and storage, the fractional-step projection algorithm was used to solve the governing equations of gas phase fluid. The low-storage, three-order Runge-Kutta scheme was used for time integration. The governing equations of particles were solved in the Lagrangian framework. These numerical schemes were validated by the good agreement be-tween the statistical results of flow field and the related experimental data. In the study of particle dis-persion, it was found that the effects on particle dispersion by the spanwise vortex structures were prominent. The new behaviors of particle dispersion were also observed during the evolution of the flow field, i.e. the transitional phenomenon of particle dispersion occurs for the particles with small and intermediate Stokes numbers.

关键词：气固两相流颗粒分散瞬变现象湍流模型直接数值模拟

Chiral bound states in a staggered array of coupled resonators

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Chinese Physics B 2024年第2期33卷 124-130页

作者：金伍林李静卢竞龚志瑞周兰 Synergetic Innovation Center for quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of EducationSynergetic Innovation Center for Quantum Effects and ApplicationsInstitute of Interdisciplinary StudiesXiangjiang-Laboratory and Department of PhysicsHunan Normal UniversityChangsha 410081China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

We study the chiral bound states in a coupled-resonator array with staggered hopping strengths,which interacts with a two-level small atom through a single coupling point or two adjacent *** addition to the two typical bound states found above and below the energy bands,this system presents an extraordinary chiral bound state located within the energy *** use the chirality to quantify the breaking of the mirror *** find that the chirality value undergoes continuous changes by tuning the coupling *** preferred direction of the chirality is controlled not only by the competition between the intracell and the intercell hoppings in the coupled-resonator array,but also by the coherence between the two coupling *** the case with one coupling point,the chirality values varies monotonously with difference between the intracell hopping and the intercell *** in the case with two coupling points,due to the coherence between the two coupling points the perfect chiral states can be obtained.

关键词： bound states two-level small atom coupled-resonator array chirality

Non-Markovianity of an atom in a semi-infinite rectangular waveguide

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Chinese Physics B 2023年第3期32卷 102-110页

作者：曾静宋亚菊卢竞周兰 Key laboratory of Low-Dimensional quantum structures and and quantum Control of the Ministry of Education Department of Physics and Synergetic Innovation Center of Quantum Effects and ApplicationsKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China

We investigate the non-Markovianity(NM)of a waveguide QED with a two-level atom as the system and a semiinfinite rectangular waveguide as the environment,where the transverse magnetic(TM_(mn))modes define the quantum channels of guided *** perfect mirror imposed by the finite end exerts a retarded feedback mechanism to allow for information backflow,which leads to NM *** the energy separation of the atom far away from the cutoff frequencies of transverse modes,the delay differential equations are obtained with single-excitation initial in the *** attention is focused on the effects of multiple quantum channels involved in guiding photons on the degree of nonMarkovian *** asymptotic value of the non-Markovianity N_(1)can be found as the atom–mirror distance is large enough,however,the asymptotic value of N_(2)of the atom interacting with the effective double-modes is lower than that of the atom interacting with the effective *** also show that N_(1)is a constant,and the analytical expression for N_(2)is related to the parameters associated with the modes,which is related to the interference of the two modes.

关键词： open system non-Markovianity waveguide QED quantum information

Casimir–Polder-Like Force for an Atom in Hartle–Hawking Vacuum outside a Schwarzschild Black Hole

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Chinese Physics Letters 2012年第8期29卷 38-41页

作者： ZHANG Jia-Lin YU Hong-Wei Institute of Physics and Key laboratory of Low Dimensional quantum structures and quantum Control of Ministry of Education Hunan Normal UniversityChangsha 410081 Center for Nonlinear Science and Department of Physics Ningbo UniversityNingbo 315211

We calculate the energy level shift of a static ground state two-level atom interacting with fluctuating massless scalar fields in the Hartle–Hawking vacuum outside a Schwarzschild black *** is found that the energy level shift is position-dependent and gives rise to a force on the atom besides the classical gravitational *** force behaves like r^(-1)(r-2M)^(-1) for r approaching 2M,whereas it behaves like r^(-2) for large r.

关键词： force outside approaching