Constructing Rich Crystalline–Amorphous Heterojunction In NiCoMo/Ag Composites for High‐Performance Supercapacitor

The crystalline–amorphous heterojunction (C–AH) has become an important strategy for constructing electrode materials due to the synergistic effect between the high conductivity from the crystalline phase and the fast ion transport capabilities from the amorphous phase. In this work, a NiCoMo/Ag 1 (NCM/Ag 1 ) electrode material with abundant C–AH interfaces is successfully produced on nickel foam substrates through a facile one‐step hydrothermal approach. The optimized NCM/Ag 1 electrode demonstrates good electrochemical performance, delivering an areal capacitance of 9266.7 mF cm −2 (125.23 mAh g −1 ) at 2 mA cm −2 and retaining 84.7% rate capability at 10 mA cm −2 . It is combined with activated carbon to construct an asymmetric supercapacitor, which achieves an energy density of 55.13 Wh kg −1 at a power density of 750 W kg −1 , while also demonstrating a capacity retention of 79.7% after 10 000 cycles. This research supplies a theoretical basis for the design of high‐performance supercapacitors.