This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction kinetics.Here,we prepare a single crystal metal‐organic ...This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction kinetics.Here,we prepare a single crystal metal‐organic framework(MOF),employing the ZIF‐67 structure as a proof of concept,which is constructed by vertically self‐pillared nanosheets(VSP‐MOF).We further converted VSP‐MOF into VSP‐cobalt sulfide(VSP‐CoS2)through a sulfidation process.Catalysis plays an important role in almost all battery technologies;for metallic batteries,lithium anodes exhibit a high theoretical specific capacity,low density,and low redox potential.However,during the half‐cell reaction(Li++e=Li),uncontrolled dendritic Li penetrates the separator and solid electrolyte interphase layer.When employed as a composite scaffold for lithium metal deposition,there are many advantage to using this framework:1)the VSP‐CoS2 substrate provides a high specific surface area to dissipate the ion flux and mass transfer and acts as a pre‐catalyst,2)the catalytic Co center favors the charge transfer process and preferentially binds the Li+with the enhanced electrical fields,and 3)the VSP structure guides the metallic propagation along the nanosheet 2D orientation without the protrusive dendrites.All these features enable the VSP structure in metallic batteries with encouraging performances.展开更多
The concept of global governance first appeared in research on international political governance in the early 1990s. At the time much of the theoretical research on global governance was to some extent isolated from ...The concept of global governance first appeared in research on international political governance in the early 1990s. At the time much of the theoretical research on global governance was to some extent isolated from the realities of world development, but since the beginning of the 21th century, global governance research has been turning to real world issues, We propose the construction, from a public management perspective, of a governance ＂issue-actor-mechanism＂ framework. This sees postwar global governance practice as the old paradigm. The paper points out that the rapid global development after the end of the Cold War has had a crucial impact on the traditional governance paradigm, followed by the emergence of new global governance issues and changes in new governance actors resulting from the changing world of the last twenty or thirty years which have led to the failure of traditional governance mechanisms. These ＂issue-actor-mechanism＂ changes are closely interlocked, and hence require a new global governance paradigm that can reflect the complex interconnections of governance issues, actors and mechanisms. We thus need to reexamine and refresh our perceptions of the world and open up a new research agenda.展开更多
文摘This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction kinetics.Here,we prepare a single crystal metal‐organic framework(MOF),employing the ZIF‐67 structure as a proof of concept,which is constructed by vertically self‐pillared nanosheets(VSP‐MOF).We further converted VSP‐MOF into VSP‐cobalt sulfide(VSP‐CoS2)through a sulfidation process.Catalysis plays an important role in almost all battery technologies;for metallic batteries,lithium anodes exhibit a high theoretical specific capacity,low density,and low redox potential.However,during the half‐cell reaction(Li++e=Li),uncontrolled dendritic Li penetrates the separator and solid electrolyte interphase layer.When employed as a composite scaffold for lithium metal deposition,there are many advantage to using this framework:1)the VSP‐CoS2 substrate provides a high specific surface area to dissipate the ion flux and mass transfer and acts as a pre‐catalyst,2)the catalytic Co center favors the charge transfer process and preferentially binds the Li+with the enhanced electrical fields,and 3)the VSP structure guides the metallic propagation along the nanosheet 2D orientation without the protrusive dendrites.All these features enable the VSP structure in metallic batteries with encouraging performances.
文摘The concept of global governance first appeared in research on international political governance in the early 1990s. At the time much of the theoretical research on global governance was to some extent isolated from the realities of world development, but since the beginning of the 21th century, global governance research has been turning to real world issues, We propose the construction, from a public management perspective, of a governance ＂issue-actor-mechanism＂ framework. This sees postwar global governance practice as the old paradigm. The paper points out that the rapid global development after the end of the Cold War has had a crucial impact on the traditional governance paradigm, followed by the emergence of new global governance issues and changes in new governance actors resulting from the changing world of the last twenty or thirty years which have led to the failure of traditional governance mechanisms. These ＂issue-actor-mechanism＂ changes are closely interlocked, and hence require a new global governance paradigm that can reflect the complex interconnections of governance issues, actors and mechanisms. We thus need to reexamine and refresh our perceptions of the world and open up a new research agenda.
