Defect engineering constructs two-dimensional metal sulfoselenide with expanded interlayers for fast and efficient sodium ion storage.

Leveraging abundant natural reserves and lower cost profiles, sodium-ion batteries (SIBs) are poised to supersede lithium-ion batteries (LIBs) within the domain of large-scale energy storage systems. Many achievements have been made in improving the properties of anodes in SIBs from the aspects of nanostructure and surface modification. Recently, the incorporation of anionic species into metal sulfides via defect engineering has emerged as an innovative strategy to boost sodium storage capabilities.

Construction of indazolo[3,2-a]isoquinolines via [3 + 2] cycloaddition of benzynes.

A [3 + 2] annulation protocol for the construction of N-substituted indazolo[3,2-a]isoquinolines starting from benzynes and C,N-cyclic azomethine imines was developed. A diverse range of highly functionalized products indazolo[3,2-a]isoquinolines featuring an indazole scaffold can be easily accessed via a one-step reaction under mild conditions, and they show good anti-proliferative activity on cancer cells.