Boosting the Electrical Transfer by Molybdenum Doping for Robust and Flexible NiSe‐Based Supercapacitor

Abstract NiSe is a promising electrode material for enhancing the energy density of supercapacitors, but it faces challenges such as sensitivity to electrolyte anions, limited specific capacity, and unstable cycling. This study employs a strategy of metal atom doping to address these issues. Through a hydrothermal reaction, Mo‐doped NiSe demonstrates significant improvement in electrochemical performance, exhibiting high capacity (799.90 C g −1 ), splendid rate performance, and excellent cyclic stability (90% capacity retention). The introduction of Mo induces charge redistribution in NiSe, leading to a reduction in the band gap. Theoretical calculation reveals that Mo doping can effectively enhance the electrical conductivity and the adsorption energy of NiSe. A flexible printed hybrid Mo‐doped NiSe‐based supercapacitor is fabricated, demonstrating superior electrochemical performance (367.04 mF cm −2 ) and the ability to power timers, LEDs, and toy fans. This research not only deepens the understanding of the electrochemical properties of metal‐doped NiSe but also highlights its application potential in high‐performance supercapacitors.