Radiation preparation of MXene/graphene oxide composite aerogel for supercapacitor
MXene/graphene oxide(GO)composites have broad application prospects in fields,such as energy,environment,and biomedicine.In this study,few-layer Ti3C2Tx was mixed with GO,which was then reduced and surface-modified using γ-ray radiation.Simultaneously,a composite hydrogel(M/rGO)was prepared by self-assembly from the interaction between the surface groups of reduced graphene oxide(rGO)and the oxygen-containing functional groups on the surface of Ti3C2Tx.The M/rGO-75 composite hydrogel prepared at an absorbed dose of 75 kGy exhibited a uniform three-dimensional network structure.The hydrogel was further freeze-dried and annealed to remove surface oxygen-containing functional groups and prepare a new composite aerogel(H-M/rGO),which maintained the original network structure.The prepared H-M/rGO electrode was used as a supercapacitor electrode.The optimized and synthesized H-M/rGO-75 composite aerogel exhibited a mass-specific capacitance of 119 F/g at a current density of 1 A/g,which was significantly higher than those of GO and aerogels without MXene.In addition,it exhibited excellent rate performance,conductivity,and cycling stability.
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