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Rational design and synthesis of advanced metal-organic frameworks for electrocatalytic water splitting

Science China Chemistry 2023年第4期66卷 943-965页

作者： Yu-jia tang Ya-Qian Lan School of Chemistry and Materials Science Institute of Advanced Materials and Flexible Electronics(IAMFE)Nanjing University of Information Science and TechnologyNanjing 210044China School of Chemistry South China Normal UniversityGuangzhou 510006China

As a promising and significant technology for hydrogen production,electrocatalytic water splitting is a research hotspot in the energy conversion field for alleviating the global energy crisis and achieving carbon neutrality ***-organic frameworks(MOFs)have been widely investigated as catalyst candidates with remarkable activity and long-term electrocatalysis durability owing to their precise and tailorable structures:tunable pore channels in the range of micropore/mesopore promote the mass/electron transfer;high specific surface areas expose abundant active species;modified metal nodes can serve as active sites;versatile organic ligands can be functionalized to further enhance the electrocatalytic *** this review,recent advances in the rational design and synthesis of advanced MOF electrocatalysts for water splitting are presented in the following ***,we analyze the design concepts of MOF electrocatalysts from the perspective of their distinct and modifiable ***,three common synthesis techniques of MOF electrocatalysts are briefly ***,we focus on the classification of different MOFs for robust electrocatalytic water splitting,including pristine MOFs,mixed-metallic MOFs,MOF nanosheets,electrically conductive MOFs,MOFs on substrates,and polyoxometalate-based ***,summary and outlook are proposed to uncover the next generation of advanced MOFs for electrochemical energy conversion applications.

关键词： metal-organic frameworks water splitting electrocatalysis hydrogen evolution reaction oxygen evolution reaction polyoxometalates

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Removal of GaN film over AlGaN with inductively coupled BCl_(3)/Ar atomic layer etch

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Chinese Physics B 2022年第1期31卷 613-617页

作者： jia-Le tang Chao Liu School of Physics and Electronic Engineering Jiangsu Normal University(JSNU)Xuzhou 221116China

Atomic layer etching(ALE)of thin film GaN(0001)is reported in detail using sequential surface modification by BCl_(3) adsorption and removal of the modified surface layer by low energy Ar plasma exposure in a reactive ion etching *** estimated etching rate of GaN is~0.74 nm/*** GaN is removed from the surface of AlGaN after 135 *** study the mechanism of the etching,the detailed characterization and analyses are carried out,including scanning electron microscope(SEM),x-ray photoelectron spectroscopy(XPS),and atomic force microscope(AFM).It is found that in the presence of GaCl_(x) after surface modification by BCl_(3),the GaCl_(x) disappears after having exposed to low energy Ar plasma,which effectively exhibits the mechanism of atomic layer *** technique enables a uniform and reproducible fabrication process for enhancement-mode high electron mobility transistors with a p-GaN gate.

关键词： atomic layer etch GaN high electron mobility transistor

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Flow structures of gaseous jets injected into water for underwater propulsion

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Acta Mechanica Sinica 2011年第4期27卷 461-472页

作者： jia-Ning tang Ning-Fei Wang Wei Shyy School of Aerospace Engineering Beijing Institute of Technology 100081 Beijing China Department of Aerospace Engineering University of Michigan Ann Arbor MI 48109 USA

Gaseous jets injected into water are typically found in underwater propulsion, and the flow is essentially unsteady and turbulent. Additionally, the high water-to-gas density ratio can result in complicated flow structures; hence measuring the flow structures numerically and experimentally remains a challenge. To investigate the performance of the underwater propulsion, this paper uses detailed NavierStokes flow computations to elucidate the gas-water interactions under the framework of the volume of fluid （VOF） model. Furthermore, these computations take the fluid compressibility, viscosity, and energy transfer into consideration. This paper compares the numerical results and experimental data, showing that phenomena including expansion, bulge, necking/breaking, and back-attack are highlighted in the jet process. The resulting analysis indicates that the pressure difference on the rear and front surfaces of the propul- sion system can generate an additional thrust. The strong and oscillatory thrust of the underwater propulsion system is caused by the intermittent pulses of the back pressure and the nozzle exit pressure. As a result, the total thrust in underwater propulsion is not only determined by the nozzle geometry but also by the flow structures and associated pressure distri- butions.

关键词： Gaseous jets - Underwater propulsion Highdensity ratio Gas-water interactions

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Lagrangian-based investigation of multiphase flows by finite-timeLyapunov exponents

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Acta Mechanica Sinica 2012年第3期28卷 612-624页

作者： jia-Ning tang Chien-Chou Tseng Ning-FeiWang School of Aerospace Engineering Beijing Institute of Technology100081 Beijing China Department of Mechanical and Electro-Mechanical Engineering National Taiwan Sun Yat-Sen UniversityKaohsiung Taiwan China Department of Aerospace Engineering University of Michigan Ann ArborM148109 USA

Multiphase flows are ubiquitous in our daily life and engineering applications. It is important to investigate the flow structures to predict their dynamical behaviors ef- fectively. Lagrangian coherent structures （LCS） defined by the ridges of the finite-time Lyapunov exponent （FTLE） is utilized in this study to elucidate the multiphase interactions in gaseous jets injected into water and time-dependent turbu- lent cavitation under the framework of Navier-Stokes flow computations. For the gaseous jets injected into water, the highlighted phenomena of the jet transportation can be observed by the LCS method, including expansion, bulge, necking/breaking, and back-attack. Besides, the observation of the LCS reveals that the back-attack phenomenon arises from the fact that the injected gas has difficulties to move toward downstream re- gion after the necking/breaking. For the turbulent cavitating flow, the ridge of the FTLE field can form a LCS to capture the front and boundary of the re-entraint jet when the ad- verse pressure gradient is strong enough. It represents a bar- rier between particles trapped inside the circulation region and those moving downstream. The results indicate that the FFLE field has the potential to identify the structures of mul- tiphase flows, and the LCS can capture the interface/barrier or the vortex/circulation region.

关键词： Finite-time Lyapunov exponents Lagrangiancoherent structures Multiphase flow Gaseous jets injectedinto water Cavitation

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Robust State Feedback Control of Wind-Excited Tall Buildings

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Wuhan University Journal of Natural Sciences 2001年第3期6卷 709-714页

作者： Liu Hui tang jia-xiang School of Civil Engineering Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

The introduction of robust control theory into structure control, as well as design procedure of stabilizing controllers for structures with parameter uncertainty and model error is discussed. A stability bound is derived from the polar decomposition of the nominal system matrix. In addition, our study shows that application of low pass filters avoids spillover by eliminating the unconsidered high frequency components. It is demonstrated, via an example, our approach leads to excellent control result and offers far better robustness than previous solutions.

关键词： wind-exciting robust control state feedback robustness

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Travelling Wave Solutions for Konopelchenko-Dubrovsky Equation Using an Extended sinh-Gordon Equation Expansion Method

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Communications in Theoretical Physics 2008年第11期50卷 1047-1051页

作者： YANG Xian-Lin tang jia-Shi College of Mechanics and Aerospace Hunan University Changsha 410082 China Hunan Radio and Television University Changsha 410004 China

The sinh-Gordon equation expansion method is further extended by generMizing the sinh-Gordon equation and constructing new ansatz solution of the considered equation. As its application, the （2＋1）-dimensional Konopelchenko-Dubrovsky equation is investigated and abundant exact travelling wave solutions are explicitly obtained including solitary wave solutions, trigonometric function solutions and Jacobi elliptic doubly periodic function solutions, some of which are new exact solutions that we have never seen before within our knowledge. The method can be applied to other nonlinear evolution equations in mathematical physics.

关键词： extended sinh-Gordon equation expansion method exact solutions nonlinear evolution equations Konopelchenko-Dubrovsky equation

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Hopf bifurcation control of a Pan-like chaotic system

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Chinese Physics B 2018年第9期27卷 374-379页

作者： Liang Zhang jia-Shi tang Qin Han College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China College of Mechanical Engineering Wuchang Institute of TechnologyWuhan 430065China

This paper is concerned with the Hopf bifurcation control of a modified Pan-like chaotic system. Based on the Routh-Hurwtiz theory and high-dimensional Hopf bifurcation theory, the existence and stability of the Hopf bifurcation depending on selected values of the system parameters are studied. The region of the stability for the Hopf bifurcation is *** the hybrid control method, a nonlinear controller is designed for changing the Hopf bifurcation point and expanding the range of the stability. Discussions show that with the change of parameters of the controller, the Hopf bifurcation emerges at an expected location with predicted properties and the range of the Hopf bifurcation stability is expanded. Finally,numerical simulation is provided to confirm the analytic results.

关键词： Hopf bifurcation control Pan-like chaotic system Routh-Hurwtiz hybrid control method stability control high-dimensional Hopf bifurcation

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Specific ion effect of H^(+) on variably charged soil colloid aggregation

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Pedosphere 2020年第6期30卷 844-852页

作者： Yekun ZHANG Rui TIAN jia tang Hang LI Chongqing Key Laboratory of Soil Multi-Scale Interfacial Process College of Resources and EnvironmentSouthwest UniversityChongqing 400715China

Specific ion effects(Hofmeister effects)have recently attracted the attention of soil scientists,and it has been found that ionic non-classic polarization plays an important role in the specific ion effect in ***,this explanation cannot be applied to H+.The aim of this work was to characterize the specific ion effect of H+on variably charged soil(yellow soil)colloid *** total average aggregation(TAA)rate,critical coagulation concentration(CCC),activation energy,and zeta potential were used to characterize and compare the specific ion effects of H+,K+,and Na+.Results showed that strong specific ion effects of H+,K+,and Na+existed in variably charged soil colloid *** TAA rate,CCC,and activation energy were sensitive to H+,and the addition of a small amount of H+changed the TAA rate,CCC,and activation energy *** zeta potential results indicated that the specific ion effects of H+,K+,and Na+on soil colloid aggregation were caused by the specific ion effects of H+,K+,and Na+on the soil electric field *** addition,the origin of the specific ion effect for H+was its chemical adsorption onto surfaces,while those for alkali cations were non-classic *** study indicated that H+,which occurs naturally in variably charged soils,will dominate variably charged soil colloid aggregation.

关键词： activation energy chemical adsorption critical coagulation concentration dynamic light scattering Hofmeister effect total average aggregation rate zeta potential

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Biorthogonal quantum criticality in non-Hermitian many-body systems

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Frontiers of physics 2022年第3期17卷 53-61页

作者： Gaoyong Sun jia-Chen tang Su-Peng Kou College of Science Nanjing University of Aeronautics and AstronauticsNanjing 211106China Key Laboratory of Aerospace Information Materials and Physics(Nanjing University of Aeronautics and Astronautics) MIITNanjing 211106China Center for Advanced Quantum Studies Department of PhysicsBeijing Normal UniversityBeijing 100875China

We develop the perturbation theory of the fidelity susceptibility in biorthogonal bases for arbitrary interacting non-Hermitian many-body systems with real eigenvalues. The quantum criticality in the non-Hermitian transverse field Ising chain is investigated by the second derivative of the ground-state energy and the ground-state fidelity susceptibility. We show that the system undergoes a second-order phase transition with the Ising universal class by numerically computing the critical points and the critical exponents from the finite-size scaling theory. Interestingly, our results indicate that the biorthogonal quantum phase transitions are described by the biorthogonal fidelity susceptibility instead of the conventional fidelity susceptibility.

关键词： biorthogonal quantum criticality non-Hermitian systems fidelity susceptibility

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SU(3) spin-orbit coupled fermions in an optical lattice

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Chinese Physics B 2022年第1期31卷 504-510页

作者： Xiaofan Zhou Gang Chen Suo-tang jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

We propose a scheme to realize the SU(3)spin-orbit coupled three-component fermions in an one-dimensional optical *** topological properties of the single-particle Hamiltonian are studied by calculating the Berry phase,winding number and edge *** also investigate the effects of the interaction on the ground-state topology of the system,and characterize the interaction-induced topological phase transitions,using a state-of-the-art density-matrix renormalization-group numerical ***,we show the typical features of the emerging quantum phases,and map out the many-body phase diagram between the interaction and the Zeeman *** results establish a way for exploring novel quantum physics induced by the SOC with SU(N)symmetry.

关键词： spin-orbit coupling topological phase transition optical lattice

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