MXene has attracted considerable attention for supercapacitor applications in the past decade owing to its exceptional electrochemical properties. Although major research interests are focused on composite-based MXene, doping engineering of MXene has recently emerged as a promising alternative. This work unveils the potential of doped MXene for supercapacitor applications with a critical perspective. Various doping engineering strategies and synthesis methods adopted are explicitly delineated. Detailed discussions on the optimization of lattice, functionalization, substitution, and interface modification are provided. Further, it sheds light on recent developments with the asssociated mechanism of doped MXene supercapacitors, followed by the associated challenges. Finally, a roadmap for further progress of doped MXene for the realization of advanced and high-performing energy storage systems has been described. We envision that this Perspective will open up new avenues for the further exploration of this domain.
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