Porous MXene Frameworks Support Pyrite Nanodots toward High-Rate Pseudocapacitive Li/Na-Ion Storage

Presented are the novel Ti₃C₂ T _x MXene-based nanohybrid that decorated by pyrite nanodots on its surface (denoted as FeS₂@MXene). The nanohybrid was obtained by the one-step sulfurization of self-assembled iron hydroxide@MXene precursor. When used for Li/Na-ion storage, the FeS₂@MXene nanohybrid present excellent rate capabilities. Particularly, for Li-ion storage, an elevated reversible specific capacity of 762 mAh g^-1 at 10 A g^-1 after 1000 cycles was achieved. And for Na-ion storage, the FeS₂@MXene nanohybrid also delivering a reversible specific capacity of 563 mAh g^-1 after 100 cycles at a current density of 0.1 A g^-1.