Abstract
In this study, we proposed in situ controlled preparation of 3D flower-like Ti3C2Tx microspheres (FMXMSs) by water-in-oil (W/O) emulsion-assisted assembly. Polyethyleneimine (PEI), as a large molecule, can effectively stabilize the emulsion system. Ethylenediamine (EDA), as a weak cross-link agent, contains rich amino groups, which can effectively induce the assembly of Ti3C2Tx in spherical droplets and eventually form 3D flower-like Ti3C2Tx microspheres. By adjusting the water-oil volume ratio, the size of micro-emulsion droplets can be controlled, thus the structure and size of microspheres can finally be controlled. The structure has a large specific surface area (108.31 m2 g-1) which can provide an effective ion diffusion pathway. As the supercapacitors electrode, the specific capacitance of FMXMSs is up to 224.57 F g-1 at 5 mV s-1 and 193.67 F g-1 at 0.5 A g-1. Moreover, they also show good long-term cyclic stability. After 5000 cycles, the specific capacitance does not decay. The results indicate that W/O emulsion-assisted assembly is feasible for preparing MXenes microspheres with high electrochemical performance.
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