Interfacial Coupling and Reconstruction in Glycerolate-Derived Co–Mn Selenium-Treated Products for High-Performance Supercapacitors

The development of electrode materials with efficient charge transfer and abundant interfacial active sites remains a key challenge for high-performance supercapacitors. Compared with conventional inorganic precursors, glycerolate-derived materials provide tunable coordination environments and self-templated structural evolution, enabling the formation of porous architectures with abundant active interfaces after post-synthetic conversion. A bimetallic cobalt–manganese glycerolate (CoMn-G) is utilized as a precursor to construct Co–Mn-based selenium-treated products via a solvothermal selenization process, with particular emphasis on interfacial reconstruction and electronic modulation. Incorporating Mn regulates the coordination environment, resulting in a homogeneous amorphous framework with enhanced defect features. Upon selenization, a pronounced phase transformation and morphological reconstruction occur, leading to the formation of porous architectures with enriched interfacial regions. Meanwhile, strong electronic coupling between Co and Mn induces charge redistribution, facilitating improved charge transfer kinetics. As a result, the optimized CoMn–Se electrode delivers a GCD-derived specific capacitance of 1015.8 F/g at 1 A/g, while a capacitance of 927.3 F/g is obtained from CV measurements at 10 mV/s along with a reduced charge transfer resistance. When assembled into a two-electrode device with reduced graphene oxide as the negative electrode, the system achieves an energy density of 66 Wh/kg at 725 W/kg and maintains 89% capacitance retention with 99% Coulombic efficiency after 10,000 cycles. The enhanced performance is attributed to synergistic effects of bimetallic interaction and selenization-induced interfacial evolution. This work provides insights into designing glycerolate-derived materials with tailored interfacial structures and electronic properties for advanced energy storage applications.