Architecting carbon-coated Mo2CTx/MoSe2 heterostructures enables robust potassium storage

Abstract

Herein, carbon-coated MoSe₂ decorated Mo₂CT_x MXene heterostructures (MoSe₂/Mo₂CT_x@C) have been fabricated. Mo₂CT_x works as a dual-function electron/ion conductor, which not only provides high conductivity and mechanical strength, but also prevents the severe self-aggregation of few layered MoSe₂ nanosheets. The high reversible capacities of 405 mA h g⁻¹ at 100 mA g⁻¹ after 150 cycles and 258 mA h g⁻¹ at 2000 mA g⁻¹ after 400 cycles could be achieved for a potassium-ion battery.