Work

Interface-engineered one-dimensional core-shell manganese‑cobalt phosphide heterostructures array as advanced electrodes for high-performance supercapacitors

Year: 2025

Type: article

Abstract: Transition metal phosphides have garnered significant attention as high-performance electrode materials for supercapacitors, owing to their superior electrical conductivity, robust redox activity, and excellent charge storage capabilities. In this study, a novel one-dimensional core-shell manganese‑cobalt phosphide (MCOMP) heterostructure is strategically designed and synthesized to optimize electrochemical performance. The synergistic interaction at the heterointerface between manganese and cobalt phosphides not only enhances electron/ion transport but also provides abundant active sites for faradaic reactions. Meanwhile, the hierarchical core-shell architecture effectively accommodates mechanical strain during repeated cycling, ensuring exceptional structural integrity and long-term stability. Electrochemical characterization demonstrates a remarkable specific capacitance of 309.5 mAh g −1 at 1 A g −1 , outperforming many previously reported TMP-based electrodes. The assembled asymmetric supercapacitor (MCOMP//AC) delivers a high energy density of 40.8 Wh kg −1 at 492.7 W kg −1 , while maintaining 82 % capacitance retention after 5000 cycles with near-ideal Coulombic efficiency (99 %). Electrochemical testing and Density Functional Theory (DFT) confirm that the heterojunction derived from the core-shell structure can significantly enhance charge transport efficiency with the help of a built-in electric field (BIEF). This study provides a rational design strategy for advanced energy storage systems, paving the way for high-performance supercapacitors.

Source: Journal of Energy Storage

DOI: 10.1016/j.est.2025.118532