Although various two-dimensional (2D) nanomaterials have been explored as promising
capacitive materials due to their unique layered structure, their natural restacking tendency
impedes electrolyte transport and significantly restricts their practical applications. Herein,
we synthesize all-carbon layer-by-layer motif architectures by introducing 2D ordered
mesoporous carbons (OMC) within the interlayer space of 2D nanomaterials. As a proof of
concept, MXenes are selected as 2D hosts to design 2D–2D heterostructures. Further
removing the metal elements from MXenes leads to the formation of all-carbon 2D–2D
heterostructures consisting of alternating layers of MXene-derived carbon (MDC) and OMC.
The OMC layers intercalated with the MDC layers not only prevent restacking but also
facilitate ion diffusion and electron transfer. The performance of the obtained hybrid carbons
as supercapacitor electrodes demonstrates their potential for upcoming electronic devices.
This method allows to overcome the restacking and blocking of 2D nanomaterials by
constructing ion-accessible OMC within the 2D host material.