In situ built nanoconfined Nb2O5 particles in a 3D interconnected Nb2C MXene@rGO conductive framework for high-performance potassium-ion batteries

A 3D Nb 2 C/rGO conductive framework with in situ generated Nb 2 O 5 nanoparticles (Nb 2 O 5 /Nb 2 C/rGO) is synthesized, exhibiting high capacity and excellent cycling stability. The synergetic charge–discharge mechanism is revealed explicitly.