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Synergistic capacitance enhancement via in-situ construction of nanoscale MnO2 on N,P-Codoped porous carbon membranes
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DOI：10.1016/j.jelechem.2026.120070.png)
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Abstract
En 中文
Using a highly conductive N, P-codoped porous carbon membrane (NPCM) as a substrate, NPCM@MnO2 composites were successfully fabricated by uniformly depositing MnO2 nanosheets on its surface via an in-situ hydrothermal method. This strategy aimed to address the intrinsic limitations of pure MnO2, namely its low conductivity and poor cycling stability. The effect of the mass ratio (X) of the carbon membrane to potassium permanganate on the structure and capacitive performance of the composites was systematically investigated. Results indicate that the composite with X = 5 (denoted as NPCM@MnO2-5) exhibits optimal electrochemical performance: it delivers a specific capacitance as high as 453 F g- 1 at a current density of 0.5 A g- 1, which is 2.3 and 2.1 times that of pure MnO2 (196 F g- 1) and pure NPCM (215 F g- 1), respectively. Even at a high current density of 20 A g- 1, a specific capacitance of 150 F g- 1 is retained. Furthermore, after 8000 charge-discharge cycles at 5.0 A g- 1, the capacitance retention rate remains at 95.5%, with a minimal decrease of only 12 F g- 1. The in-situ hydrothermal method enables the uniform coating of MnO2 nanosheets on the carbon membrane. The synergistic effect between the highly conductive NPCM scaffold and the high-pseudocapacitance MnO2 significantly enhances both the specific capacitance and cycling stability of the composite. This design strategy, integrating a self-supporting conductive framework, in-situ growth, and interfacial synergy, provides a promising route toward high-performance supercapacitor electrodes.
Keywords:
P-codoping
Porous carbon membrane
Manganese dioxide (MnO 2 )
Supercapacitor
In-situ hydrothermal synthesis
Synergistic energy storage
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