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Radiation‐Induced Self‐Assembly of Ti3C2Tx with Improved Electrochemical Performance for Supercapacitor

As a new family of 2D materials, MXenes have already shown a broad application prospect in energy storage. However, the inevitable restacking of MXene nanosheets always limits their performance. Here, a facile and environmentally friendly approach is developed to fabricate self‐assembly Ti3C2Tx MXene (named SA‐Ti3C2Tx) via γ‐irradiation. The absorbed dose has obvious influence on the self‐assembly of SA‐Ti3C2Tx by changing the surface charge characteristics and groups to make the nanosheets assembled into large slices with different structure. At dose of 20 kGy, radiation‐synthesized SA‐Ti3C2Tx (SA‐Ti3C2Tx‐20) possesses the crumpled structure which exhibits larger specific surface area, enhanced conductivity, and larger specific capacitance, compared with those of original Ti3C2Tx. SA‐Ti3C2Tx‐20 also shows excellent rate performance and cycling stability. This study paves the way for the modification and assembly of MXenes with improved electrochemical performance.