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MXenes are an ew family of 2D transition metal carbides and nitrides,w hich have attracted enormous attention in electrochemicale nergys torage,s ensingt echnology, and catalysis owing to their good conductivity, high specific surface area, and excellent electrochemical properties.I nt his work, as eries of Co 3 O 4 -doped 3D MXene/RGO hybrid porousa erogels is designed and prepared through af acile in situ reduction and thermala nnealing process, in which the reduced graphene oxide (RGO) conductiven etwork can electrically link the separated Co 3 O 4 -MXene composite nanosheets,l eading to enhanced electronic conductivity. It is found that upon using the Co 3 O 4 -MXene/RGO hybrid porous aerogelp repared with am ass ratio of Co 3 O 4 -MXene/RGOo f 3:1( CMR31) as an electrode for as upercapacitor,asuperior specific capacitance of 345 Fg À1 at the current density of 1Ag À1 is achieved, which is significantly higher than those of Ti 3 C 2 T x MXene, RGO, and MXene/RGO electrodes. In addition, ah igh capacitance retention (85 %o ft he initialc apacitance after 10 000 cycles at ah igh current density of 3Ag À1 ) and al ow internal resistance R s (0.44 W)c an be achieved. An all-solid-state asymmetric supercapacitor( ASC) device is assembled using CMR31, and it has the ability to light up a blue LED indicator for 5min if four ASCs are connected in series. Therefore, these novel Co 3 O 4 -MXene/RGOh ybrid porous aerogels have potential practical applicationsi n high-energys torage devices.