Self-assembled MXene-graphene oxide composite enhanced laser-induced graphene based electrodes towards conformal supercapacitor applications

The construction of the easy-removed self-assembled MXene-GO composites has been proposed to enhance the application diversity of LIG based material in energy storage areas. The as-prepared composite combines the advantages of both high conductivity and abundant active sites of MXene, and porous microstructure of LIG, which presents modified interface characteristics and improved electrochemical performance. Additionally, laser induction technique used here to realize the graphenization of PI, introduction of pseudocapacitive MXene, and patterning and integration of series LIG-C based supercapacitors. [Display omitted] •Easy-removed self-assembled MXene-graphene oxide composite to promote the capacitive performance of LIG-based supercapacitors.•The composites (LIG-C) combine high conductivity of MXene particles and good microstructures of LIG.•LIG-C possesses low sheet resistance of 15.0 Ω sq−1 and good stability including a specific capacitance retention of 98.9% after six months and 102.4% after 1000 cycles charge–discharge process.•LIG-C based supercapacitor possesses good performance uniformity and conformal ability, which will be suitable for the development of conformal electronic devices. Since pure laser-induced graphene (LIG)-based supercapacitors suffer poor capacity, additional active materials need to be introduced to promote the capacitive performance of LIG-based electrodes. However, the effective introduction and the removal of redundant active materials remain challenging during the fabrication of planar LIG-based supercapacitors. Here we propose the easy-removed self-assembled MXene-graphene oxide composite (C) for the preparation of LIG-based supercapacitors. Owing to the combination of homogeneous C solution and programmable laser-induced process, the as-prepared supercapacitor based on laser-induced C covered polyimide (PI) films (LIG-C) showed enhanced capacity and improved ion transportation characteristics due to the low sheet resistance (15.0 Ω sq−1) and homogenous microstructures. What’s more, the LIG-C-based supercapacitor prepared under laser power of 3 W exhibited good stability including a specific capacitance retention of 98.9% after six months and 102.4% after 1000 cycles charge–discharge process. Additionally, LIG-C-based supercapacitors also showed good performance uniformity, and series LIG-C-based supercapacitors could power a LED because of a voltage expansion. At the same time, LIG-C-based supercapacitors possessed good