Further construction of MnO_2 composite through in-situ growth on MXene surface modified by carbon coating with outstanding catalytic properties on thermal decomposition of ammonium perchlorate

摘要

In order to improve the dispersion of MnO2 particles and inhibit the self-oxidation of MXene, during MnO2/MXene preparation, MXene@C was firstly prepared before the hybridization of MnO2 and MXene. The coating of carbonaceous materials on the surface of MXene could not only provide carbon as reducing agent to KMnO4 for the in situ generation of MnO2 with controlled extent of reaction for good morphology obtaining, but more importantly, form the shielding layer to avoid MXene oxidation during the redox reaction. The structure and morphology of MnO2/MXene@C composite were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and X-ray photoelectron spectra (XPS). The results indicated that the layer MXene was well protected and MnO2 particles with uniform particle size were well distributed on the surface of MXene. Furthermore, the catalytic property of MnO2/MXene@C composite on the thermal decomposition of ammonium perchlorate (AP) was evaluated by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). With the addition of 2 wt% MnO2/MXene@C composite, the high-temperature decomposition of AP was sharply decreased by 128.8 degrees C, which was higher than that of pure MXene and MnO2.