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Graphitic carbon nitride wrapped zinc vanadium hydroxide electrode for improved hybrid supercapacitor efficiency
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DOI：10.1016/j.jpowsour.2025.236851.png)
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Abstract
En 中文
Despite advancements, electrochemical energy storage devices are still limited by power and energy density requirements and cannot fully replace fossil fuels. Herein, we propose a novel design for a graphitic carbon nitride-wrapped zinc vanadium hydroxide heterojunction electrode. Utilizing the principle of electrostatic layer assembly, we synthesized a hollow spherical heterostructure with interlayers by adjusting the pH value to achieve solution self-assembly. Surface morphology and crystal structure analyses reveal that the layers provide effective electron transport and ion diffusion channels. Meanwhile, these interlayers adjust the energy band gap of whole material, reducing the electron transport barrier and enhancing electrochemical performance. Electrochemical tests indicate that the heterojunction electrode combines the double advantages of battery diffusion and capacitive near-surface electrochemical reactions, exhibiting impressive kinetics of response and energy storage characteristics. Notably, the electrode demonstrates a specific capacitance of 1931.5 F g- 1 at a current density of 1 A g-1. The assembled heterojunction//activated carbon coin cell exhibits excellent energy density (70.4 Wh kg- 1) and power density (749.6 W kg- 1). Moreover, it maintains a capacitance retention rate of nearly 100 % and Coulombic efficiency after 10,000 cycles. This study suggests a promising new direction for developing and applying next-generation high-efficiency energy storage devices.
Keywords:
Hybrid supercapacitors
2D carbon nanomaterials
Bimetallic hydroxide
Heterojunction
Journal
IF:
7.9
Papers:
3.7W
Citations:
15.0W
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