Single-atom catalysts (SACs) have emerged as a transformative class of materials in heterogeneous catalysis owing to their atomically dispersed metal centers, maximal atom utilization, and well-defined coordination en...Single-atom catalysts (SACs) have emerged as a transformative class of materials in heterogeneous catalysis owing to their atomically dispersed metal centers, maximal atom utilization, and well-defined coordination environments. In the energy sector, SACs have shown exceptional performance in electrocatalytic reactions such as the oxygen reduction reaction (ORR), hydrogen evolution reaction (HER), and carbon dioxide reduction (CO2RR), where their tunable local electronic structures facilitate high activity and selectivity under mild conditions. Meanwhile, in the environmental domain, SACs are increasingly explored for advanced oxidation processes (AOPs), particularly in water purification applications, due to their ability to generate reactive species from green oxidants like hydrogen peroxide or peroxymonosulfate (PMS). Among various AOP strategies, PMS-based Fenton-like reactions have gained attention due to the high oxidation potential and stability of PMS in a wide pH range.展开更多
Auxetic metamaterials have attracted much attention due to their outstanding advantages over traditional materials in terms of shear capacity,fracture resistance,and energy absorption.However,there are lack of design ...Auxetic metamaterials have attracted much attention due to their outstanding advantages over traditional materials in terms of shear capacity,fracture resistance,and energy absorption.However,there are lack of design inspirations for novel auxetic structures.According to the materials databases of atomic lattice,some natural crystals possess negative Poisson’s ratio(NPR).In this paper,the mechanism of auxeticity in microscale Ti crystal is investigated through density functional theory simulation.Then we propose a macroscopic auxetic metamaterial by mimicking the microscopic atomic lattice structure of the bodycentered cubic Ti crystal.The NPR property of the macroscopic metamaterial is verified by theoretical,numerical and experimental methods.The auxeticity keeps effective when scaling up to macroscopic Ti crystal-mimic structure,with the similar deformation mechanism.Furthermore,from the geometric parameter investigation,the geometric parameters have great influence on the Poisson’s ratio and Young’s modulus of the macroscopic metamaterial.Importantly,an optimized structure is obtained,which exhibits 2 times enhancement in auxeticity and 25 times enhancement in normalized Young’s modulus,compared to the original architecture.This work establishes a link between the physical properties at micro-nanoscale and macroscale structures,which provides inspirations for high load-bearing auxetic metamaterials.展开更多
Carbon-based dual-metal sites catalysts(DMSCs)have emerged as a new frontier in the field of sustainable energy due to their unique coordination environments,electronic structure,the maximized atom utilization.The rea...Carbon-based dual-metal sites catalysts(DMSCs)have emerged as a new frontier in the field of sustainable energy due to their unique coordination environments,electronic structure,the maximized atom utilization.The reasonable utilization of carbonbased DMSCs provides new possibilities to achieve the outstanding catalytic performance,remarkable selectivity,recyclability in energy-related catalysis.Based on this,this review intends to summarize the recent breakthroughs in carbonbased DMSCs for the energy catalysis.Firstly,the definition and classifications of DMSCs are proposed,mainly dividing into three types(isolated dual-metal site pairs,binuclear homologous dual-metal sites pairs,binuclear heterologous dual-metal sites pairs).Subsequently,we discuss the potential of DMSCs targeting on energy conversion reactions,such as electrocatalytic hydrogen evolution reaction(HER),oxygen evolution reaction(OER),oxygen reduction reaction(ORR),CO_(2)reduction reaction(CO_(2)RR),N_(2) reduction reaction(NRR).Finally,we predict the remaining challenges and possible opportunities on the unique carbon-based DMSCs for energy applications in the future.展开更多
Fano-like quantum routing of single photons in a system with two waveguides coupled to two collocated atoms is investigated theoretically. Using a full quantum theory in real space, photonic scattering amplitudes alon...Fano-like quantum routing of single photons in a system with two waveguides coupled to two collocated atoms is investigated theoretically. Using a full quantum theory in real space, photonic scattering amplitudes along four ports of the waveguide network are analytically obtained. It is shown that, by adjusting the atomic dipole-dipole interaction, an evident Fano-line shape emerges in the scattering spectra of the single-dot configuration system. Moreover, Fano resonance can also be achieved by varying the atom-waveguide coupling strength and atomic detuning, in the presence of the atomic dipole-dipole interaction. Therefore, the atomic dipole-dipole interaction may be utilized as a possible way to control spectral Fano-like resonance. The feasibility with the experimental waveguide channels is also discussed.展开更多
文摘Single-atom catalysts (SACs) have emerged as a transformative class of materials in heterogeneous catalysis owing to their atomically dispersed metal centers, maximal atom utilization, and well-defined coordination environments. In the energy sector, SACs have shown exceptional performance in electrocatalytic reactions such as the oxygen reduction reaction (ORR), hydrogen evolution reaction (HER), and carbon dioxide reduction (CO2RR), where their tunable local electronic structures facilitate high activity and selectivity under mild conditions. Meanwhile, in the environmental domain, SACs are increasingly explored for advanced oxidation processes (AOPs), particularly in water purification applications, due to their ability to generate reactive species from green oxidants like hydrogen peroxide or peroxymonosulfate (PMS). Among various AOP strategies, PMS-based Fenton-like reactions have gained attention due to the high oxidation potential and stability of PMS in a wide pH range.
基金supported by the National Key R&D Program of China(Grant No.2021YFA1400300)the National Natural Science Foundation of China(Grant Nos.12172047,12372177,and 12102007)+1 种基金Beijing Natural Science Foundation(Grant Nos.1244057 and Z190011)Beijing Institute of Technology Research Fund Program for Young Scholars.
文摘Auxetic metamaterials have attracted much attention due to their outstanding advantages over traditional materials in terms of shear capacity,fracture resistance,and energy absorption.However,there are lack of design inspirations for novel auxetic structures.According to the materials databases of atomic lattice,some natural crystals possess negative Poisson’s ratio(NPR).In this paper,the mechanism of auxeticity in microscale Ti crystal is investigated through density functional theory simulation.Then we propose a macroscopic auxetic metamaterial by mimicking the microscopic atomic lattice structure of the bodycentered cubic Ti crystal.The NPR property of the macroscopic metamaterial is verified by theoretical,numerical and experimental methods.The auxeticity keeps effective when scaling up to macroscopic Ti crystal-mimic structure,with the similar deformation mechanism.Furthermore,from the geometric parameter investigation,the geometric parameters have great influence on the Poisson’s ratio and Young’s modulus of the macroscopic metamaterial.Importantly,an optimized structure is obtained,which exhibits 2 times enhancement in auxeticity and 25 times enhancement in normalized Young’s modulus,compared to the original architecture.This work establishes a link between the physical properties at micro-nanoscale and macroscale structures,which provides inspirations for high load-bearing auxetic metamaterials.
基金the National Natural Science Foundation of China(Nos.22201262 and 52201261)the Natural Science Foundation of Henan Province(No.222300420290)the China Postdoctoral Science Foundation(No.2021M702939).
文摘Carbon-based dual-metal sites catalysts(DMSCs)have emerged as a new frontier in the field of sustainable energy due to their unique coordination environments,electronic structure,the maximized atom utilization.The reasonable utilization of carbonbased DMSCs provides new possibilities to achieve the outstanding catalytic performance,remarkable selectivity,recyclability in energy-related catalysis.Based on this,this review intends to summarize the recent breakthroughs in carbonbased DMSCs for the energy catalysis.Firstly,the definition and classifications of DMSCs are proposed,mainly dividing into three types(isolated dual-metal site pairs,binuclear homologous dual-metal sites pairs,binuclear heterologous dual-metal sites pairs).Subsequently,we discuss the potential of DMSCs targeting on energy conversion reactions,such as electrocatalytic hydrogen evolution reaction(HER),oxygen evolution reaction(OER),oxygen reduction reaction(ORR),CO_(2)reduction reaction(CO_(2)RR),N_(2) reduction reaction(NRR).Finally,we predict the remaining challenges and possible opportunities on the unique carbon-based DMSCs for energy applications in the future.
基金Supported by the National Natural Science Foundation of China under Grant No 11247032the Natural Science Foundation of Jiangxi Province under Grant Nos 20151BAB202012 and 20151BAB212004the Scientific Research Foundation of the Jiangxi Provincial Education Department under Grant No GJJ160633
文摘Fano-like quantum routing of single photons in a system with two waveguides coupled to two collocated atoms is investigated theoretically. Using a full quantum theory in real space, photonic scattering amplitudes along four ports of the waveguide network are analytically obtained. It is shown that, by adjusting the atomic dipole-dipole interaction, an evident Fano-line shape emerges in the scattering spectra of the single-dot configuration system. Moreover, Fano resonance can also be achieved by varying the atom-waveguide coupling strength and atomic detuning, in the presence of the atomic dipole-dipole interaction. Therefore, the atomic dipole-dipole interaction may be utilized as a possible way to control spectral Fano-like resonance. The feasibility with the experimental waveguide channels is also discussed.
