Metal sulfides have attracted significant attention in sodium-ion battery research owing to their high theoretical capacity. However, their practical application is hindered by volume fluctuations and low conductivity caused by conversion reactions. In this study, hollow cobalt disulfide/nitrogen-doped carbon (CoS₂/NC) nanoboxes were synthesized from cobalt-based Prussian blue analogues (PBA) through a sulfidation process. The resulting nanoboxes, approximately 500 nm in size, possess hollow interiors constructed from interconnected primary nanoparticles (~ 50 nm). The unique hierarchical structure provides abundant void space to accommodate volume changes and shortens transport pathways. Furthermore, the integration of nitrogen-doped carbon matrix significantly enhances the electronic conductivity. When employed as an anode material for sodium-ion batteries, hollow CoS₂/NC nanoboxes delivered an outstanding desodiation capacity of 619.4 mAh·g⁻¹ at 5 A·g⁻¹ over 400 cycles with an average capacity loss of only 0.04% per cycle. This study highlights the potential of PBAs as precursors for synthesizing nanoscale metal sulfides with nitrogen-doped carbon matrices, offering a promising approach to enhance electrochemical performance in energy storage systems.

Manganese silicate nanomaterials have attracted attention due to their high specific surface area, large pore volume, adjustable pore size and good biocompatibility. Manganese silicate nanomaterials with various morphologies such as hollow nanospheres, solid nanospheres, and core‒shell nanospheres are synthesized. Hollow manganese silicate nanomaterials can be applied in cancer diagnosis, cancer therapy, synergistic cancer therapy, etc.. This review mainly introduced the synthesis and applications of manganese silicate nanomaterials. Moreover, the future prospects for development of manganese silicate nanomaterials were discussed.